Opinion
The defendant, the planning and zoning commission of the town of North Haven (commission), appeals from the judgment of the trial court sustaining the appeal of the named plaintiff, Dennis Loring,1 from the commission’s decision denying the plaintiffs site plan application seeking to locate an adult, sexually oriented book and video store in a shopping plaza in *749North Haven (town). The commission’s principal claim is that the trial court improperly substituted its judgment for that of the commission in determining that the plaintiffs proposed accessory use of fifteen video preview booths is customarily incidental to his proposed primary use of an adult book and video store, and hence a valid accessory use. The commission further contends that the trial court improperly ordered it to approve the application rather than remand the case back to the commission for further proceedings. We affirm the trial court’s judgment.
The record reveals the following undisputed facts and procedural history. Dell’Oro Plaza is a shopping plaza located on Washington Avenue in a commercially zoned district in the town. Prior to May, 2005, approximately 1576 square feet of the plaza had been leased for use as a barber shop and a karate studio. In May, 2005, the plaintiff submitted an application to the commission seeking permission to change the use of that part of the plaza to: “Retail—Adult Book and Video Store with Video Preview Booths.” The plaintiff cited §6.1.11 of the North Haven zoning regulations as authority for the proposed use; that regulation lists “[b]asic neighborhood stores” as a permitted use in commercial zones.2 There was significant opposition to the application from town residents.
On July 11, 2005, the plaintiff first appeared before the commission on the application through his attorney, *750Daniel Silver, and his professional engineer, Gordon Bilides. Because the plaintiff had submitted a revised site plan in response to initial comments from the town’s land use administrator, Alan Fredricksen, that neither the commission nor the town’s land use staff had been able to review prior to the meeting, the plaintiff agreed to waive the requisite time limitation for acting on an application and to postpone further discussions until August 1, 2005. Before adjourning, however, there was a brief discussion on the video preview booths. Specifically, commission chairman Dominic Palumbo asked how many people would be able to use a booth at one time and how many booths would be on site. Silver responded that only one person per booth could view at a time and that, although the number of booths had not yet been determined, this information would be made known to the commission at or before the next meeting. Commission member James Giulietti then noted to Palumbo that, “in terms of preparation, [Giulietti] would like the [plaintiff] to be aware that [the commission is] looking into whether or not viewing booths are a permitted use,” a statement with which Palumbo concurred.
On July 18, 2005, Fredricksen received a letter from Silver providing further information about the video preview booths. Silver indicated therein that the plaintiff “is seeking to provide fifteen . . . video preview booths which [constitute] an accessory use and [are] customarily incidental to the permitted uses of a retail book and video store under [the town’s] existing [z]oning [regulations.” Silver further indicated various steps that the plaintiff would undertake to ensure that only one person would be able to view a video in a booth at a time. Although Silver indicated his willingness to address any problems or concerns with the application and accompanying site plan, he did not hear from the town’s land use officials prior to the August 1, 2005 commission meeting.
*751At the August 1 meeting, Silver began his statements to the commission by noting that the revised site plan application had dealt with all but two issues that had been raised by the town’s land use staff in its previous review of the application: the adequacy of landscaping around the dumpster and lighting. After Bilides addressed those issues, the commission raised questions regarding the irrigation system and the lighting plan. Silver assured the commission that, if the application was approved, the plaintiff would work with the town’s staff to address the commission’s concerns.
After addressing those issues, Silver turned to the issue that had been raised the previous month regarding the video preview booths. Silver asserted at the outset that the booths were a valid accessory use to the permitted use under the town’s regulations. He then provided the following information in response to questions by commission members. The fifteen video booths each would be four feet square, with a door that locked. Only one person would be permitted to enter a booth at a time, and no loitering would be permitted outside the booths if all fifteen were occupied. The booths were coin operated with the cost of viewing one quarter per minute. Beyond eliciting information about the booths, various commission members expressed concerns as to whether the booths were a customary part of the video business when facilities like Blockbuster video stores have no preview booths and as to whether a customer could watch more than one minute of a video. Silver responded to these concerns by explaining that, although there was no mechanism to preclude a patron from paying to view for an unlimited period of time, the booths were not provided for that purpose. Rather, the sale of the videos “depends on the ability to have these preview booths” because, unlike mainstream media products for which there are preview facilities or reviews, “adult sexually oriented materials” had no *752such outlets. Silver further asserted, citing his extensive experience representing clients similar to the plaintiff, that these booths were customary in adult book and video stores. Two commission members, Palumbo and Giulietti, responded with statements indicating that they accepted Silver’s statement that the booths were customary in adult book and video stores.3 After a brief discussion off the record, the commission unanimously voted to deny the site plan application. The two stated reasons were: (1) “[vjideo preview booths are not a permitted use”; and (2) “[t]here is no suitable/adequate parking for a use including fifteen . . . video preview booths.”
Pursuant to General Statutes § 8-8, the plaintiff appealed from the commission’s decision to the Superior Court, contesting both grounds as arbitrary, illegal and an abuse of discretion. The plaintiff further contended that the commission’s decision as to the adequacy of the parking violated fundamental fairness, because the commission never had indicated that there was any issue with the number of parking spaces and therefore had provided the plaintiff with no opportunity to respond to such a concern. The trial court sustained the plaintiff’s appeal.
With respect to the first reason for the denial, the court noted that both sides had framed the issue “as to whether the fifteen preview booths could be considered an accessory use.” More specifically, the court noted: “The commission did not say [in its decision] that an adult bookstore as such was not a permitted use; it said only [that] video booths were not a permitted use. In light of the regulation’s provision for accessory uses to the primary use [North Haven Zoning Regs., *753§ 6.1.71]4 the issue here must be whether the video booths were an accessory to the primaiy use which is an adult bookstore. This is how the [commission’s] brief addresses the problem, arguing as it does that video booths in the context of this case and record cannot be considered an accessoiy use.”
The court cited this court’s seminal case on accessory uses, Lawrence v. Zoning Board of Appeals, 158 Conn. 509, 511-13, 264 A.2d 552 (1969), for the following guiding principles: “[An] accessory use [is] a use which is customary in the case of a permitted use and incidental to it. ... An accessory use under a zoning law is a use which is dependent on or pertains to the principal or main use. . . . The word incidental as employed in a definition of accessoiy use incorporates two concepts. It means that the use must not be the primary use of the property but rather one which is subordinate and minor in significance. . . . But incidental, when used to define an accessory use, must also incorporate the concept of reasonable relationship with the primary use. It is not enough that the use be subordinate; it must also be attendant or concomitant. To ignore this latter aspect of incidental would be to permit any use which is not primaiy, no matter how unrelated it is to the primary use. . . .
“Although [the word customarily] is used in this and many other ordinances as a modifier of incidental, it should be applied as a separate and distinct test. Courts have often held that use of the word customarily places a duty on the board or court to determine whether it is usual to maintain the use in question in connection with the primary use of the land. ... In examining the use in question, it is not enough to determine that *754it is incidental in the two meanings of that word as discussed [previously]. The use must be further scrutinized to determine whether it has commonly, habitually and by long practice been established as reasonably associated with the primary use. ... In situations where there is no . . . specific provision in the ordinance, the question is the extent to which the principal use as a matter of custom, carries with it an incidental use so that as a matter of law, in the absence of a complete prohibition of the claimed incidental use in the ordinance, it will be deemed that the legislative intent was to include it.” (Citations omitted; internal quotation marks omitted.)
To apply these principles to the present case, the trial court examined the record and determined that the only evidence as to the specific issue of whether video booths were an accessory use to an adult book and video store was Silver’s extensive remarks on that subject. The court noted, but rejected, the two reasons cited by the commission as to why it had declined to credit those remarks: (1) Silver’s remarks were unsworn; and (2) the commission “undeniably questioned [Silver’s representations] based on its personal knowledge of other businesses in town that offer adult videos for sale and rental.” The court rejected the first reason as a matter of law, and the second as a matter of fact. The court examined Silver’s remarks and concluded that, if his remarks were accepted, “it [would be] difficult to reach any other conclusion” than that the video booths are an accessory use to the permitted use, an adult book and video store. The court went on to note that, under other circumstances, the number of video booths could raise an issue as to whether that use rose to a level that was not “incidental” to the primary use. It concluded, however, that the commission’s decision clearly did not rest on this ground as it issued a flat denial that video preview booths are not *755a permitted use, the record revealed no evidence that the number of booths had been raised as an issue, and the commission previously had not construed its accessory use regulation; see footnote 4 of this opinion; to support this limiting principle.
With respect to the second ground for the commission’s denial of the site plan application, inadequate parking, the court concluded that the record did not support the commission’s decision on this ground. Although the court recognized that parking was a legitimate matter for the commission to consider, it noted that the plaintiffs site plan provided for more parking spaces than the number required under the town’s zoning regulations. It also noted the absence of any indication in the record that the commission had raised any concern related to this issue, either in correspondence between the plaintiff and town land use officials or at the hearings before the commission. Moreover, because the commission had not raised that issue, the court noted that the plaintiff was deprived of an opportunity to respond to any such concerns, in violation of principles of fundamental fairness. Accordingly, the court concluded that there was nothing in the record to support the commission’s conclusion that the parking was inadequate. It therefore sustained the plaintiffs appeal.
Pursuant to General Statutes § 8-9, the commission then filed a petition for certification to appeal to the Appellate Court, which that court granted. Thereafter, pursuant to the plaintiffs motion and over the commission’s objection, the trial court modified the judgment to direct the commission to approve the plaintiffs application. The commission then filed a separate petition for certification to appeal from the modified judgment, which the Appellate Court also granted. We transferred the appeals to this court; see General Statutes § 51-199 (c) and Practice Book § 65-1; and thereafter granted the commission’s motion to consolidate the appeals.
*756On appeal, the commission challenges both the substance of the trial court’s decision concluding that the commission had acted arbitrarily in denying the plaintiffs site plan application and the relief ordered by the court. Before turning to the specific claims at issue, we note that review of a zoning agency’s decision is governed by certain well established standards. “It is axiomatic that the review of site plan applications is an administrative function of a planning and zoning commission. Norwich v. Norwalk Wilbert Vault Co., 208 Conn. 1, 12, 544 A.2d 152 (1988). When a commission is functioning in such an administrative capacity, a reviewing court’s standard of review of the commission’s action is limited to whether it was illegal, arbitrary or in abuse of [its] discretion . . . .” (Internal quotation marks omitted.) Clifford v. Planning & Zoning Commission, 280 Conn. 434, 440, 908 A.2d 1049 (2006).
“In reviewing a decision of a zoning board, a reviewing court is bound by the substantial evidence rule, according to which, [conclusions reached by [the board] must be upheld by the trial court if they are reasonably supported by the record. The credibility of the witnesses and the determination of issues of fact are matters solely within the province of the [board]. . . . The question is not whether the trial court would have reached the same conclusion, but whether the record before the [board] supports the decision reached. ... If a trial court finds that there is substantial evidence to support a zoning board’s findings, it cannot substitute its judgment for that of the board. . . . If there is conflicting evidence in support of the zoning commission’s stated rationale, the reviewing court . . . cannot substitute its judgment as to the weight of the evidence for that of the commission. . . . The agency’s decision must be sustained if an examination of the record discloses evidence that supports any one of the reasons given.” (Internal quotation marks *757omitted.) Vine v. Zoning Board of Appeals, 281 Conn. 553, 559-60, 916 A.2d 5, on remand, 102 Conn. App. 863, 927 A.2d 958 (2007).
I
We begin with the commission’s challenges to the trial court’s determination that the commission had acted arbitrarily in concluding that the video preview booths were not a valid accessory use to the primary, permitted use of an adult book and video store because that ground for the denial was not supported by substantial evidence. The commission agrees that the trial court’s summary of the pertinent case law on accessory use was thorough and accurate. In particular, the commission agrees that the “customarily incidental” standard under Lawrence v. Zoning Board of Appeals, supra, 158 Conn. 511-13, is the guiding law to determine whether an accessory use is valid. The commission contends, however, that the trial court improperly applied this standard by substituting its judgment for that of the commission in that it: (1) concluded that the commission was required to credit Silver’s statements that the video preview booths are customary in the adult video business; (2) failed to take into account the commission’s personal knowledge on that issue; and (3) failed to take into account facts from which the commission reasonably could have concluded that the video preview booths were not subordinate to the primary use or minor in significance, and therefore were not incidental to the primary use. We disagree with each of these contentions.
A
Turning first to Silver’s statements, we note the following additional facts. At the August 1, 2005 hearing on the plaintiffs application, Silver noted that the plaintiffs proposed adult book and video store “was the first store of its kind within the community,” a fact that the *758commission never has contested. Because of this fact, Silver explained in detail the nature and purpose of the video preview booths. He stated that he had represented persons involved in the adult entertainment business before zoning authorities in Connecticut and other states for thirty-five years. He specifically represented to the commission, on the basis of that experience, that video preview booths are a customary component of that business. He further explained why these booths are customary, in that they are necessary to promote the sale of adult videos, the permitted primary use under the application. Silver also stated that he would be willing to provide testimony to this effect under oath. The commission did not respond to the offer to testify under oath. Two commission members, however, did make statements indicating that they had accepted Silver’s representation that video preview booths are a customary part of the adult video business, and no commission member stated a view to the contrary.5
An unsworn statement of a party’s counsel is competent evidence before a zoning body. See Parsons v. Board of Zoning Appeals, 140 Conn. 290, 293, 99 A.2d 149 (1953); Paige v. Town Plan & Zoning Commission, *75935 Conn. App. 646, 661, 646 A.2d 277 (1994), rev’d on other grounds, 235 Conn. 448, 668 A.2d 340 (1995). Although the commission was free to give Silver’s testimony the weight and credence it merited; Parsons v. Board of Zoning Appeals, supra, 293; it was not entitled to reject it arbitrarily. See Clifford v. Planning & Zoning Commission, supra, 280 Conn. 440 (court considers whether commission acted illegally, arbitrarily or in abuse of its discretion); cf. Friedman v. Planning & Zoning Commission, 222 Conn. 262, 268, 608 A.2d 1178 (1992) (commission expressly declined to credit plaintiffs’ witness on traffic issue because witness was not traffic engineer). As this court aptly explained in the analogous context of a trial: “A trial court cannot conclude the opposite of testimony it rejects where there is no evidence to justify that opposite conclusion. Nor can it arbitrarily disregard, disbelieve or reject an expert’s testimony in the first instance. . . . Where the trial court rejects the testimony of a plaintiffs expert, there must be some basis in the record to support the conclusion that the evidence of the [expert witness] is unworthy of belief.” (Citations omitted; internal quotation marks omitted.) Builders Service Corp. v. Planning & Zoning Commission, 208 Conn. 267, 294, 545 A. 2d 530 (1988). The only statements made by commission members on the record indicated their agreement with Silver’s representations on this matter. To the extent that the commission suggests that it declined to credit Silver’s testimony because it was not sworn testimony, its failure to accept Silver’s offer to testily under oath belies any such contention.
B
The commission claims, however, that it “undeniably questioned [Silver’s representations] based on its personal knowledge of other businesses in the area that offer adult videos for sale and rental.” The commission has not pointed us to any specific statements or ques*760tions from commission members regarding such businesses, and our independent review of the record has revealed none.6 Although we are mindful that commission members may rely on personal knowledge, their views must be based on facts known to them rather than on speculation. See Gibbons v. Historic District Commission, 285 Conn. 755, 767, 941 A.2d 917 (2008) (“[t]o be capable of meaningful review on appeal, [the commission’s] determinations must be based on actual knowledge and factual evidence, not solely on personal beliefs or aesthetic preferences”); Feinson v. Conservation Commission, 180 Conn. 421, 427-28, 429 A.2d 910 (1980) (“We have in the past permitted lay members of commissions to rely on their personal knowledge concerning matters readily within their competence, such as traffic congestion and street safety . . . and local property values. . . . We [also] have . . . recognized as well that expert testimony may be required when the question involved goes beyond the ordinary knowledge and experience of the trier of fact.” [Citations omitted; internal quotation marks omitted.]). Moreover, if the commission members intended to disregard Silver’s expert testimony because of some special knowledge they had regarding what is customary for adult book and video stores, they should have stated *761the basis of their opinion on the record to allow the plaintiff an opportunity to rebut that evidence. See United Jewish Center v. Brookfield, 78 Conn. App. 49, 59, 827 A.2d 11 (2003) (“Agency members can act based upon their own personal knowledge on the history of the property involved in the application .... However, for the agency to disregard evidence from experts there must be some evidence in the record which undermines either the experts’ credibility or their final conclusions. . . . When the agency chooses to rely upon special knowledge or expertise of some its members, it must bring the matter up at an appropriate stage of the proceedings, generally at or prior to the public hearing, so that anyone adversely affected by that information has an opportunity to question and rebut it.” [Internal quotation marks omitted.]). Because it was undisputed that there were no other adult book and video stores then or previously operating in town and there is no evidence in the record to suggest that commission members had any personal knowledge of such businesses outside of the town, we reasonably cannot conclude that the commission members based their conclusions on personal knowledge.
As this court noted with regard to the issue of custom in Lawrence v. Zoning Board of Appeals, supra, 158 Conn. 513, “[a]s for the actual incidence of similar uses on other properties . . . the use should be more than unique or rare, even though it is not necessarily found on a majority of similarly situated properties.” We are aware of at least one case in which a court has recognized that coin operated video booths generally are viewed as “customarily incidental to the so-called ‘adult’ book store”; In re Appeal of French Adult Books, Inc., 44 Pa. Commw. 489, 491-92, 404 A.2d 740 (1979);7 and *762several other cases addressing other zoning issues or issues outside the zoning context that have arisen in the context of adult book and video stores that farther suggest that video preview booths are a common component of such stores. See, e.g., Los Angeles v. Alameda Books, Inc., 535 U.S. 425, 122 S. Ct. 1728, 152 L. Ed. 2d 670 (2002); Bolivar Road News, Inc. v. Director of Revenue, 13 S.W.3d 297 (Mo. 2000); Rosenblatt v. Houston, 31 S.W.3d 399 (Tex. App. 2000), cert. denied, 532 U.S. 1067, 121 S. Ct. 2218, 150 L. Ed. 2d 211 (2001); Houston v. Mitchell, 737 S.W.2d 370 (Tex. App. 1987); Davis v. State, 658 S.W.2d 572 (Tex. Crim. App. 1983); World Wide Video, Inc. v. Tukwila, 117 Wash. 2d 382, 816 P.2d 18 (1991), cert. denied, 503 U.S. 986, 112 S. Ct. 1672, 118 L. Ed. 2d 391 (1992).
C
Finally, the commission contends that, “[a]lthough the [plaintiff] will maintain that the only purpose of the video preview booths is for customers to preview tapes on sale within the store, the [commission] reasonably could have concluded that the use of the video preview booths will not be subordinate or minor in significance. ” (Emphasis added.) See Lawrence v. Zoning Board of Appeals, supra, 158 Conn. 512 (Incidental component of accessory use standard “incorporates two concepts. It means that the use must not be the primary use of the property but rather one which is subordinate and minor in significance. . . . [It] also incorporate[s] the concept of reasonable relationship with the primary use.”).8 Specifically, the commission points to the facts that there are fifteen booths in a 1576 square foot space, that the booths will be fully enclosed with doors that lock and that customers could use the booths to watch *763an entire videotape or several videotapes. We reject the commission’s post hoc justification.
The commission has failed to explain why these facts render the use not to be incidental to the primary use, and it cites no case law from which we can glean its rationale. There is nothing in and of the facts themselves to suggest that the video preview booths are not incidental to the primary use. The video preview booths would cover only approximately 15 percent of the square footage in the store. Moreover, it is unclear how the physical features of the booths, such as locking doors, bear on their incidental nature. With regard to the number of booths in conjunction with their use, it is unclear whether the commission is suggesting that the revenues generated are more than incidental. The commission did not seek information, however, and therefore none was provided, as to possible revenues expected to be generated by the video preview booths. Therefore, any determination that the booths were not subordinate to the primary use based on revenues, either based on their intended use for previewing videos or abuse of that intended use for extended viewing, would have been based on pure speculation. Notably, the commission does not claim that it did base its conclusion on the ground that the booths are not incidental to the primary use, only that it could have. We agree that the commission could have raised this issue at or before the August 1, 2005 hearing, but it did not do so, and its unequivocal statement that “[v]ideo preview booths are not a permitted use” evidences that the incidental nature of the booths was not the basis on which the commission rejected the plaintiffs application.
The commission underscores, however, case law in which this court has affirmed that, “ [w]hether a particular use qualifies as an accessory use is ordinarily a question of fact for the zoning authority, to be determined by it with a liberal discretion.” (Internal quota*764tion marks omitted.) Clifford v. Planning & Zoning Commission, supra, 280 Conn. 451. What the commission seems to ignore is the admonition that follows this statement: “In determining whether a zoning commission’s actions were reasonable, we examine whether there was substantial evidence in the record to support the commission’s determination. . . . The substantial evidence rule is similar to the sufficiency of the evidence standard applied in judicial review of jury verdicts, and evidence is sufficient to sustain an agency finding if it affords a substantial basis of fact from which the fact in issue can be reasonably inferred. It must be enough to justify, if the trial were to a jury, a refusal to direct a verdict when the conclusion sought to be drawn from it is one of fact for the jury. ... In light of the existence of a statutory right of appeal from the decisions of local zoning authorities ... a court cannot take the view in every case that the discretion exercised by the local zoning authority must not be disturbed, for if it did the right of appeal would be empty . . . .” (Citations omitted; internal quotation marks omitted.) Id., 452-53. At issue in all of these matters is not whether the commission properly could have considered any one of the aforementioned issues. Rather, it is that there was some onus on the commission not to act arbitrarily, and the principal way in which courts decide whether an agency’s decision is arbitrary is to determine whether there is substantial evidence in the record to support that decision. See Samperi v. Inland Wetlands Agency, 226 Conn. 579, 587-88, 628 A.2d 1286 (1993); DiPietro v. Zoning Board of Appeals, 93 Conn. App. 314, 325, 889 A.2d 269, cert. denied, 277 Conn. 925, 895 A.2d 796 (2006). Indeed, if the commission had special knowledge regarding adult oriented stores that it had acted upon but that was not reflected in the record, it readily could have made the basis of that knowledge known to the trial court.
*765In the present case, the commission merely stated that the “[vjideo preview booths are not a permitted use.” This conclusory statement cannot serve as the reason for the commission’s denial of the plaintiffs application. Therefore, in the absence of actual knowledge or factual evidence to contradict Silver’s testimony, the trial court properly concluded that the record did not contain substantial evidence to support the commission’s conclusion that the video preview booths are not a valid accessory use to the primary permitted use of an adult book and video store.
D
The dissent concludes, however, that, “[t]he [operative] ordinance does not . . . refer specifically to adult oriented stores, which necessarily means that the viability of the plaintiffs proposed accessory use depends on how it fits within the local understanding of the proposed principal use under the regulations, namely, a ‘[b]asic neighborhood store’ . . . .” We disagree with the dissent’s conclusion for two reasons. First, the dissent would have us decide this appeal on a different basis than the one that the commission presented to the trial court and this court. The record before the trial court and the briefs to this court make it abundantly clear that the commission has framed the issue on appeal as whether video preview booths are customarily incidental to adult book and video stores, not as the dissent has framed the issue as to whether such booths are customarily incidental to the broader category under § 6.1.11 of “[b]asic neighborhood stores . . . .”9 In so doing, the dissent ignores well settled *766rules limiting appellate review to issues actually raised and briefed. See State v. Dalzell, 282 Conn. 709, 715, 924 A.2d 809 (2007); Sabrowski v. Sabrowski, 282 Conn. 556, 560, 923 A.2d 686, aff'd after remand, 105 Conn. App. 49, 935 A.2d 1037 (2007). Although questions by a few commission members during the hearing on the plaintiffs application indicate that some commission members may have been viewing the issue as whether the video preview booths were customary in video stores generally, the commission’s posture, as a collective body, before the trial court and this court is controlling. See Konigsberg v. Board of Aldermen, 283 Conn. 553, 597 n.24, 930 A.2d 1 (2007) (“[a]s we have observed repeatedly, [t]o review [a] claim, which has been articulated for the first time on appeal and not before the trial court, would result in a trial by ambuscade of the trial judge” [internal quotation marks omitted]); Jalowiec Realty Associates, L.P. v. Planning & Zoning Commission, 278 Conn. 408, 418, 898 A.2d 157 (2006) (declining to review claim because defendants, zoning commission and its individual members, did not raise it adequately before trial court).
Second, we disagree with the fundamental underpinning of the dissent’s analysis, namely, that we look to the broadest category of permitted uses under which the principal use falls rather than the actual permitted principal use to determine whether a use is customary *767to that use. An accessory use is determined specifically by reference to the primary use of the property to which it is incidental. See Graff v. Zoning Board of Appeals, 277 Conn. 645, 658-59, 894 A.2d 285 (2006); Beit Havurah v. Zoning Board of Appeals, 177 Conn. 440, 447-48, 418 A.2d 82 (1979); Fox v. Zoning Board of Appeals, 146 Conn. 70, 74-75, 147 A.2d 472 (1958). As our seminal case on accessory uses explains, custom is determined by reference to “similarly situated properties,” not by reference to the permitted use defined at its highest level of abstraction. See Lawrence v. Zoning Board of Appeals, supra, 158 Conn. 513 (“In applying the test of custom, we feel that some of the factors which should be taken into consideration are the size of the lot in question, the nature of the primary use, the use made of the adjacent lots by neighbors and the economic structure of the area. As for the actual incidence of similar uses on other properties, geographical differences should be taken into account, and the use should be more than unique or rare, even though it is not necessarily found on a majority of similarly situated properties.” [Emphasis added.]); see, e.g., id., 514 (specifically considering “whether the raising of chickens and goats was accessory use—one which was subordinate and customarily incidental to property located in the center of town and used for residential purposes,” not whether it was customary to all residential properties [emphasis added]); Sun Cruz Casinos, LLC v. Hollywood, 844 So. 2d 681, 684 (Fla. App. 2003) (viewing permitted use specific to actual use as “restaurant with frontage” on intracoastal waterway, not restaurants generally, when concluding that trial court properly determined that no customary association existed between gaming boat operations and waterfront restaurants to support valid accessory use); Simmons v. Zoning Board of Appeals, 60 Mass. App. 5, 9-10, 798 N.E.2d 1025 (2003) (citing Lawrence and considering *768size of lot and rural character of area, rather than just classification of residential property, to determine whether maintaining two horses and stable is valid accessory use), review denied, 441 Mass. 1103, 803 N.E.2d 333 (2004); State v. P.T. & L. Construction Co., 77 N.J. 20, 22, 27-29, 389 A.2d 448 (1978) (viewing permitted use specific to actual use as headquarters for construction company when concluding that helistop pad for landing helicopters was valid accessory use to “similar main uses”). Accordingly, the legitimacy of a proposed accessory use must be considered in light of the actual permitted use and not a broad generalization thereof.
Thus, it seems clear that to determine whether the proposed accessory use in this case is a valid accessory use by using a Blockbuster video store as a point of reference applies an inapt basis of comparison. Although both Blockbuster video stores and adult video stores are “[b]asic neighborhood stores”—in fact, they are both video stores—they are significantly different kinds of video stores. They invariably will sell different products, have different clientele and, therefore, have different accessory uses. Indeed, the fact that the commission has framed the issue on appeal by reference to the actual primary use of an adult book and video store, not by reference to the abstract category of basic neighborhood stores, suggests that the commission understands the applicable guiding principles.10
*769II
We next turn to the commission’s second stated reason for denying the plaintiffs application, namely, inadequate parking. The commission contends that: (1) its decision on this ground was supported by the evidence; and (2) the trial court improperly concluded that the commission had violated principles of fundamental fairness by failing to raise the issue in such a way as to give the plaintiff notice and an opportunity to respond to this concern. The commission also contends that, to the extent that the plaintiff was not given an opportunity to respond, the proper remedy was a remand to the commission for a hearing. We agree with the trial court’s conclusion that there was not substantial evidence to support the commission’s denial of the application on the basis of inadequate parking. Therefore, we do not address the fundamental fairness ground of the trial court’s opinion. We address the propriety of the court’s relief in part III of this opinion.
In its brief to this court, the commission asserts that the town’s parking regulation would have required 7.9 spaces for the plaintiffs store, based on its square footage,11 and the plaintiffs improved site plan map “reflects [that] there will be only a surplus of three . . . parking spaces .... Yet, the site plan application seeks to utilize fifteen . . . video preview booths at the subject property. Based on the aforementioned, it is only logical that the [commission] would find that the parking layout shown on the site plan was inadequate to support the *770proposed use of fifteen . . . video preview booths.” The record also indicates that there were fifty-seven parking spaces reflected in the site plan for the shopping plaza, which also exceeded the number required by the regulation. By the commission’s own admission, therefore, the plaintiffs site plan not only conformed to the parking regulation, it exceeded the requirements. “When reviewing a site plan application, a planning commission similarly acts in an administrative capacity and may not reject an application that complies with the relevant regulations. See Kosinski v. Lawlor, 177 Conn. 420, 427, 418 A.2d 66 (1979) (‘[o]nce the defendants had determined that the site plan complied with the applicable regulations, the issuance of a certificate of approval became a mere ministerial act’).” Pansy Road, LLC v. Town Plan & Zoning Commission, 283 Conn. 369, 375, 926 A.2d 1029 (2007).
The commission appears to contend that the parking was inadequate a priori because there were fifteen video preview booths. We acknowledge the possibility that some unique aspect of a business might require more spaces than those required under the regulation. The commission has failed to explain, and the record does not indicate, however, the factual assumptions that were used to establish the ratio between a site’s square footage and the number of parking spaces required under the regulation. For example, such factual assumptions might have been based on the average, maximum or minimum number of customers estimated to: visit a site in relation to its square footage; travel to a site by car rather than by other means; and travel together in a single vehicle. Similarly, the commission had failed to explain why the factual assumptions would not apply in the present case simply because there would be fifteen video preview booths on the site.
Although parking is a proper consideration and subject to some discretion; Feinson v. Conservation Com*771mission, supra, 180 Conn. 427; as the trial court properly noted, “there must be some basis in the record to save a zoning agency’s decision on parking or traffic from being characterized as illegal or arbitrary.” Finding no such basis, the trial court properly could not conclude that the denial based on the lack of adequate parking reasonably was supported by the record.12 Samperi v. Inland Wetlands Agency, supra, 226 Conn. 587-88; DiPietro v. Zoning Board of Appeals, supra, 93 Conn. App. 325.
Ill
Last, we turn to the question of whether the trial court properly ordered the commission to approve the plaintiffs application. The governing law is not disputed. Rather, what is disputed is the application of that governing law to the facts of the present case. We conclude that, in light of the record, the trial court properly ordered the commission to grant the plaintiffs application.
General Statutes § 8-8 (I) provides in relevant part: “The court, after a hearing thereon, may reverse or affirm, wholly or partly, or may modify or revise the decision appealed from. If a particular board action is required by law, the court, on sustaining the appeal, may render a judgment that modifies the board decision or orders the particular board action. . . .” In his prayer for relief, the plaintiff sought an order sustaining his appeal and an order directing the commission to approve the application.
*772“When, on a zoning appeal, it appears that as a matter of law there was but a single conclusion which the zoning authority could reasonably reach, the court may direct the administrative agency to do or to refrain from doing what the conclusion legally requires. Watson v. Howard, 138 Conn. 464, 470, 86 A.2d 67 (1952); Executive Television Corporation v. Zoning Board of Appeals, 138 Conn. 452, 457, 85 A.2d 904 (1952); Bishop v. Board of Zoning Appeals, 133 Conn. 614, 623, 53 A.2d 659 (1947). In the absence of such circumstances, however, the court upon concluding that the action taken by the administrative agency was illegal, arbitrary or in abuse of its discretion should go no further than to sustain the appeal taken from its action. For the court to go further and direct what action should be taken by the zoning authority would be an impermissible judicial usurpation of the administrative functions of the authority. Bogue v. Zoning Board of Appeals, 165 Conn. 749, 753-54, 345 A.2d 9 (1974); Guerriero v. Galasso, 144 Conn. 600, 608, 136 A.2d 497 (1957); Watson v. Howard, supra, 469-70.” (Internal quotation marks omitted.) Mobil Oil Corp. v. Zoning Commission, 30 Conn. App. 816, 820, 622 A.2d 1035 (1993).
In light of the reasoning set forth in parts I and II of this opinion, we conclude that there was only one conclusion that could have been drawn as a matter of law in the present case. Therefore, the trial court did not improperly usurp the commission’s function by ordering it to approve the plaintiffs application.
The judgment is affirmed.
In this opinion ROGERS, C. J., and PALMER, J., concurred.