This cause was submitted in the chancery court upon the pleadings and proof as noted by the register, and a final decree rendered by the chancellor in favor of the complainants in the bill, from which the present appeal is prosecuted by the respondent, the Huntsville Elks’ Club. The purpose of the bill is to enforce a mechanic’s lien on the property described for an alleged balance claimed to be due for the *131erection of the described building. A copy of the contract, which was in writing, is made an exhibit to the bill. By the terms of the written contract (article 6) the Avork Avas to be completed within 10 months from the receipt of the figured drawings from the architect. Time became and was made an essence of the contract by the provisions thereof. In paragraph 6 of the bill it is alleged that after the work was begun a neiv agreement Avas made in July, 1906, under which the building Avas to be completed within a reasonable time from that date. The defendant by its ansAver expressly denied the making of any new agreement as alleged in the bill or any change or modification of the contract as to the time of the completion of the building, and further set up in its answer to the bill that the contractors wholly failed to complete the building within the time stipulated in the contract, and that by reason of the failure to complete the building within the time limit the contract Avas breached, to the great damage of the defendant, in that the defendant was deprived of the use of the building for more than a. year, Avhich use Avas reasonably Avorth to the defendant a large sum, namely, more than $7,000, all of AA'hich damages the defendant claimed and seeks to recoup against the claim of the complainants set up in the bill.
The chancellor in his decree ignored the respondent’s claim for damages sought to be recouped, and doubtless upon the theory that the new arrangement as alleged in the bill between the parties had been established by the proof. But a careful consideration of the evidence by us leads us to a different conclusion, and under the statute (section 5955, subd. 1) we are required to weigh the evidence and. decide on the facts without attaching any weight to the decision of the chancellor.
*132The burden rested on the complainants to establish by proof the alleged change in the original contract. While parties may vary, or change written contracts by subsequent parol agreements, yet when a change is averred and there is a denial of it, the proof of change should be clear and satisfactory. The complainants’ testimony here is not of that clear and satisfactory character; besides, the weight of the respondent’s evidence is against the alleged change of the original contract as averred in the bill.
The bill contains no averment of an estoppel against the respondent’s right to claim damages arising out of a breach by the complainants of the original contract as alleged in the respondent’s answer to the bill. Nor are any facts stated in the bill on which an estoppel in favor of the complainants against the respondent’s claim of damages might be predicated.
The sureties on the bond of the contractors, the Garrity-Hahn Building Company, which was given for the faithful performance of the contract, were in law equally bound with their principals, the Garrity-Hahn Company, for the carrying out of the contract and equally responsible in damages for any failure in performance, or. breach, of- 'said contract oh the part of their said principals. This is a'proposition of law too-plain to require citation' of authorities.' When the principals, the Garrity-Hahn Company, because of financial embarrassment, were unable to • carry out the. contract and their sureties came to their relief by furnishing them the means to the performance of the contract, the sureties did no more than was their duty to the other party to the contract, and in doing so it was for their own benefit in saving themselves from damages consequent upon a breach of the contract by their principals; and in no sense did such action furnish any new or additional consideration to the original contract.
*133The sureties Avere bound to know the terms of the contract, the performance of which they guaranteed, and the time limit for the completion of the building, and that time Avas an element of essence of the contract.
The respondent was under no legal duty to call the attention of the sureties to the time limit in the contract and to notify them that the respondent would insist on it, and therefore could not be held to waive it in accepting what Avas done by the sureties in furnishing financial aid to their principals, the Garrity-Hahn Company, in order to enable them to complete the building, although they might not be able to do so within the time specified; no fault or blame for the delay attaching to the respondent. A Avaiver, to be binding, must operate by Avay of an estoppel or be supported by a valuable consideration. — 28 Am. & En. Ency. Law (1st Ed.) 531.
As Ave have said, no new agreement was shown, and the respondent did not by its conduct estop itself to claim the benefit of the time provision in the contract.. Conduct, as the basis of an estoppel, must have been intended for the other party to act on, and he must have been induced to act upon it. — Scharfenburg v. Town of New Decatur, 155 Ala. 651, 47 South. 95.
Time being of the essence of the contract, then for the breach of this provision by delay in the completion of the building the respondent was entitled to the damages sustained, and to recover the same by way of recoupment when sued on the contract. The measure of damages in such á case is the value of the use of the building for the time that the owner was deprived of the use by the delay of the contractor. — 6 Cyc. 91; Fidelity & Deposit Co. v. Robertson, 136 Ala. 379, 34 South. 933; Hutchins v. Munn, 209 U. S. 246, 28 Sup. Ct. 504, 52 L. Ed. 776.
*134As we have already intimated, by merely allowing the work to go on to completion after the expiration of the time named in the contract, the owner did not waive its claim to damáges for delay, and, when sued on the contract, the owner is entitled to recoup the damages sustained by such delay. — Lawrence County v. Stewart Bros., 72 Ark. 525, 81 S. W. 1059; Sinclair v. Tallmadge, 35 Barb, (N. Y.) 602; 30 Am. & Eng. Ency. Law (2d Ed.) 1260.
It follows, therefore, from the views entertained by us and herein above expressed, that the decree of the chancellor must be reversed; and one will be rendered here, ordering a reference to the register to ascertain the balance due the complainants on the contract, as well, also, the amount of damages sustained by the respondent on account of the delay in the completion of the building, to be allowed as a set-off against the claim of the complaiants. And in the holding of such reference, both parties will be allowed, in addition to testimony already taken, to offer such evidence as they may see fit, that is competent and relevant.
Reversed, rendered, and remanded.
All the Justices concur. .