This is an action to enforce a mechanic’s lien'for part of labor and material in a residence built for defendant by plaintiffs as contractors. The judgment in the trial court was for plaintiffs. The controversy between these parties does not reach the lien except as it may be affected by the correctness of the items of account in dispute. These items are as follows:
Extra work on stone piers under barn.. .$ 10.50
Extra work on excavation under house .. 48.90
Extra work on foundation under house... 243.47
It was also claimed by defendants that plaintiffs failed to enter a credit of $25.
It is defendants’ contention that the item for extra work on foundation and excavation under the house and barn were *319included in the original contract price, as shown by the written contract between the parties. The facts as to the work for the foundation at the house and for the barn are different; we will consider them separately. The contract was that plaintiffs were to “provide all the materials and perform all the work mentioned in the specifications and shown on the drawings.” Article 9 of the contract provided: “It is hereby mutually agreed between the parties hereto that the sum to be paid by the owner to the contractor for said work and materials shall be nine thousand and six hundred dollars, subject to additions and deductions as hereinbefore provided.”
The specifications referred to in the contract provided: “The contractor shall furnish all material, labor, transportation, scaffolding, etc., of every description required for the full performance of the work herein specified.” They also specified that the contractor should, “excavate for the cellar footings, drains, etc., of the dimensions and of the depths as shown by the drawings, required by the grade and do any other excavating required, to fully carry out the work herein specified.” They further provided as follows: “All foundations to go down to the natural and undisturbed earth and to extend deeper than shown on the drawings, if necessary to reach firm and solid foundation.” The drawings showed a foundation of a specified depth, and the charges in this account, as extras, are for work and material below that depth. The specifications made the drawings a part thereof, and further specified: “Anything which is not shown on the drawings, but which is mentioned in the specifications, or vice versa, and anything not expressly set forth in either, but which is reasonably implied, shall be furnished and performed the same as though shown and mentioned in both.” The case showed that when the foundation was excavated to the depth shown by the drawings, it was found necessary by the contractor and architect to go deeper in order to reach firm and solid ground, than was required in the specifications *320as above set out. That in consequence tbe contraétor did go deeper; doing the additional work and furnishing the ad ditional material necessary therefor.
In our -opinion the court should have, as a matter of law, instructed the jury, as asked by defendants’ refused instruction No. 4, that the plaintiffs could not recover an account of the additional foundation work under the house. The terms of the contract are so clear on that head as to leave no doubt as to the meaning. The contractor was to do all the work and furnish all the material contemplated by the specifications and drawings. By the specifications quoted aboye, he was to sink the foundation to firm, natural and undisturbed earth, even though it should be necessary to go beyond the depth shown by the drawings. That was a part of the work and material covered by the contract price of $9,600, as above set out, which he was to receive for the building. 'It was as clearly provided for as any other part of the contract. Being provided for, it could not be an “extra.” An extra in a building contract, is something beyond, or outside the provisions of' the contract. It is something not provided for and, therefore, not covered by the compensation stipulated. It is no answer to this to say, as was argued by plaintiffs’ counsel, that such additional excavation might have been in such character of ground as to have gone to a great depth and required a vast quantity of material and much labor. That is a condition which it must be supposed that plaintiff contemplated when he entered into the stipulations aforesaid. It is a situation which he might have provided against in the contract, and not having done so the courts can not now aid him by interpolating a stipulation which he omitted. This rule of' law was applied to a contractor who was stopped at his work by injunction. McQuiddy v. Brannock, 70 Mo. App. 535, 542. It was applied to a contractor who agreed to finish a schoolhouse by a given time and it was destroyed by lightning when nearly complete. School District v. Donchy, 25 Conn. *321530. And to an unavoidable accident wbicb caused delay in a shipment of stock. Harrison v. Railroad, 74 Mo. 370.
The case of Stuart v. Cambridge, 125 Mass. 102, is much like that before us. In that case, as in this, the plans showed a foundation wall of certain depth, while the specifications provided that it should be that depth “and as much deeper as necessary to guarantee a firm and solid foundation.” On reaching the depth shown in the plans the earth was found not to be solid and it became necessary to sink piles in order to secure a firm foundation. The court said: “By the fair construction of this contract the plaintiffs agreed to do all the work necessary to secure a firm foundation. They took the risk of its being necessary to drive piles in order -to secure such foundation.” To the same effect are similar cases from New Hampshire and Ohio. Leavitt v. Hover, 67 N. H. 94; Ashley v. Henehan, 56 Ohio St. 559, 570.
But plaintiffs say that the contract quoted above shows that the work must be shown in the specifications and the drawings, and that since the provision for going the additional depth is found in the specifications but not in the drawings, therefore, it was not such work as that provision of the contract covers. If we concede that the part of the contract aforesaid, taken alone, should read as thus contended, it would not avail plaintiffs, for the specifications adopted by the contract provide, as above set out, that if work is called for by the specifications and not shown in the drawings it shall be considered as called for by both.
The contract also provided that at thirty days after the commencement of the work, and every two weeks thereafter, the architect should “issue to the contractor a certificate which should be an order on the owner to pay the contractor” eighty-five per cent of the value of labor and material in the building. A certificate was written and signed by the archi*322tect for tbe work and material in controversy, but it was not delivered to tbe contractor. .It was sent to tbe owner by mail, wbo afterwards returned it to tbe architect. Tbat action came about in tbis way: one of plaintiffs called on tbe architect for tbe certificate for tbe work and material in controversy. Tbe architect told him tbat be was too busy to attend to it then but would make it out and send to defendant. Tbe defendant received it and returned it to tbe architect. Tbe architect then having bis attention called to tbe specifications did not deliver the certificate to plaintiffs because be did not consider tbat be should decide whether the work and material was extra as contended by plaintiffs and denied by the defendant. Under these facts, we hold that tbe certificate was not issued in tbe sense of the contract. The provision of tbe contract, that the architect shall “issue to the contractor” a certificate, means, that he shall deliver to him; and a delivery to the opposite or antagonistic party, is not a delivery in tbe sense of the contract. But aside from the question of delivery, tbe contract itself provided that “no certificate given or payment made under tbis contract, except the final certificate or final payment, shall be conclusive evidence of tbe performance of tbis contract, either wholly or in part, . . .” So, therefore, though a certificate bad been properly issued to plaintiffs, it not being a final certificate, did not conclude tbe defendant.
The parties, in their briefs, have treated tbe item of $10.50 for what is termed extra work and material for tbe barn, in the same way that they discussed tbe items just disposed of, except that in that tbe evidence tended to show tbat when a question was made as to tbat work defendant promised plaintiffs to pay that sum and thereupon plaintiffs did the work and furnished the material. So tbe difference between this item and those just disposed of consists in defendant’s promise. Defendant now contends tbat tbe promise was without - consideration and, therefore, he is not liable *323thereon. The point made is that the work on the barn, like that on the foundation of the house, was plainly provided for in the contract and was to be paid for by the sum named in the contract for the entire work. That plaintiffs, if allowed to recover, would be getting double compensation. That the promise to pay them was a promise to pay for what they were already obligated to do. The item being based on work and material which plaintiffs were bound to do and to furnish under their original contract, without regard to the subsequent promise now relied upon, it is plain that the promise is without consideration and that it can not be the subject of an action. Lingenfelder v. Brewing Co., 103 Mo. 578. That case was where an architect had contracted to do the work of his profession in and about the building of a refrigerating plant for a brewing company. In the course of the construction he quit the work without legal cause, and the brewing company promised that if he would resume his work it would pay him an additional five per cent. The architect thereupon did resume his work and afterwards sued the company on the promise. Judge GaNTt, speaking for the court, said of this-: “What we hold is, that when a party merely does what he has already obligated himself to do, he can not demand an additional compensátion therefor, and although by taking advantage of the necessities of his adversary he obtained a promise for more, the law will regard it as nudum pactum, and will not lend its process to aid the wrong.”
There are cases where a party may in reality be bound by a contract to perform certain work, but where the situation is such, either from the ambiguity of expression, or other circumstances, the true meaning thereof is uncertain and in doubt. In such instances there may be an agreement in the nature of a compromise, which will be enforced. In such eases the uncertainty — the doubt — is a sufficient consideration for the new and certain promise. But we can not allow that principle here for the doubt and uncertainty in this contract. *324taken as a whole, as we have already seen, does not exist. If we should allow it, we would but offer encouragement to refusals to fulfill plain contracts and to the exacting of unjust demands.
Defendant claims a credit of $25 as a payment which has not been allowed by plaintiffs. The payment is admitted, and it is admitted that it was not allowed as credit. Plaintiffs explain the matter in this way: They say that originally they were to give bond for the faithful performance of the contract but finding that difficult to do, the final agreement was that they would deposit $1,000 in a local bank as surety in place of a bond. That plaintiffs were to be allowed something by defendant by way of interest on the money deposited, and that the payment of $25 was on that account, and not on the building. The contract, as written, says nothing of this. It merely provides for the $1,000 surety deposit by plaintiffs. Undoubtedly plaintiffs would not be allowed to recover anything on the verbal contract as thus stated by them. It would be a clear violation of the rule of evidence to permit them to so vary and add to the written contract. But if defendant has paid it, though not legally bound to have done so, can he now claim to apply it as a payment in a different direction? "We think not. He can not now no more be permitted to apply it as a payment on some other head, than he could be allowed to sue for and recover it in a distinct suit. The contract, however unenforcible at first, has become executed by payment.
“A mere promise of a thing to one is void for want of consideration, and words of present gift are only a promise. But when the promise is executed by delivery of the thing, the imperfection in the contract of gift is cured, and the thing can not be reclaimed.” Bishop on Contracts, secs. 82, 89. So, therefore, whether defendant paid the item of $25 to the plaintiffs on account of the money deposit'made by them, is a- question of fact which was properly submitted to *325the jury by defendant’s instruction No. 11. Bier peremptory instruction to allow it as a payment was properly refused.
The case shows that the work and material, which we have been discussing, was, in fact, done by subcontractors under plaintiffs and that they have filed and obtained a judgment enforcing a mechanic’s lien against defendant’s building for the sum they were to receive from plaintiffs. The court refused to direct the jury to allow this lien as a credit on plaintiffs’ claim. The theory of the court was, as is shown by instructions for plaintiffs, that no credit should be allowed by the jury, but that the court would allow such credit when shown that defendant had paid the lien judgment. Under a provision of the contract this view was erroneous. It was stipulated that if at any time there was evidence of any lien, the account for which was made by, or, was chargeable to the contractor, the owner should have a right to retain an amount sufficient to indemnify him against such lien or claim. Thus it was defendant’s clear right to have the amount of the lien, as long as it was unpaid by plaintiffs, deducted from plaintiffs’ account. The result of the theory adopted at the trial, is to exactly reverse the provision of the contract and make the defendant first pay liens instead of the plaintiffs.
It is claimed by plaintiffs that the mechanic’s lien judgment in favor of the Tixrner Bros, as subcontractors is res •adjudicada on the question whether the foundation work and material in controversy was extra and outside the contract. It is sufficient to say of this, that no such theory was advanced at the trial. Plaintiffs did not introduce it in evidence and no instruction was asked by them on that head. No showing was made by plaintiffs which would enable us to consider the question, much less to say that their contention is well founded.
The judgment is reversed and the cause remanded.
All concur.