Opinion by
Mr. Justice Mestrezat,This case comes before us in a very unsatisfactory condition. Some of the material and most important questions cannot be reviewed because the assignments of error are in violation of the rules of court. We have said time and again that such assignments will not be considered. We have twenty-one assignments presented for consideration, less than one-half of which would have been entirely sufficient to raise all the material questions in the case. Had the time required for the preparation of these assignments been devoted to the preparation of the lesser number, there can be little doubt that the rules of court would have been observed and the important questions would have been properly presented for review.
The fifteenth assignment violates rule 30 in failing to quote the part of the charge assigned for error, and assignments sixteen to twenty inclusive violate the same rule in omitting to quote the answers to the points. Assignments seventeen to twenty must also be dismissed because the points for charge request binding instructions.
This was a scire facias on a mechanic’s claim to enforce the payment of a balance alleged to be due the *172plaintiff for the construction of a house in Avalon borough, Allegheny county. The work was done under a written contract, the first article of which provides that “the contractor under the direction and to the satisfaction of the owner .... shall and will provide all the materials and perform all the work mentioned in the specifications.” The defense was that the plaintiff had not completed the work to the satisfaction of the owner or in substantial compliance with the contract. The trial resulted in a verdict for the plaintiff for the amount of the claim with a deduction of about $250 besides the credits admitted.
The second, third and tenth assignments and the objection to the parts of the charge bearing on the matters therein contained must be sustained. It was wholly immaterial how many kinds of gas there were in the borough of Avalon. The contract specifically provided that the contractor should construct the two gas lines and the fact that artificial gas was not in use in Avalon did not relieve him from this stipulation of the agreement. For the same reason the testimony should have been excluded as to the flue linings in the chimneys. The contract required the plaintiff to put the flue lining in, and it was conceded that he had not done so, nor were there any reasons given why he did not comply with this part of his agreement. The contract also provided that Acme Anti-Rust paint should be used for the tin painting, but in direct violation of this provision of the agreement the plaintiff used Princess’s Metallic paint. He does not assign any reason for a change in the paint but offered and was permitted to show on the trial that the paint he used was as good as that provided in the agreement. The defendants had a right to insist upon the substantial performance of these express stipulations of the contract and the plaintiff was not relieved from this duty by reason of the fact that there was only one kind of gas in the borough, that a differently constructed chimney was equally as good as that stipulated for, or that the paint used by *173the plaintiff was of the same or a better quality than that provided in the agreement. As said by Mr. Justice Sterrett in Gillespie Tool Co. v. Wilson, 123 Pa. 19, 26: “In neither of these particulars, nor in any other respect, was there any serious difficulty in the way of completing the work in strict accordance with the terms of the agreement.” The question was not whether one gas line and a different flue lining and paint would answer as well as those required by the agreement, but whether the work done and materials furnished were a substantial performance of the contract.
The fourth assignment must be dismissed. The offer made by the counsel for the defendants, in addition to what otherwise might have been competent, included matter which tended to contradict that part of the written agreement which, it was not pretended, had been altered or changed by the parties.
The fifth assignment is not sustained. The matter proposed to be proved was entirely immaterial. It could not affect the case in any way. The fact, if it be a fact, that Air. Morgan suggested to Mrs. Gamble that an architect was unnecessary does not change his liability on his contract under the facts of the case as disclosed by the evidence.
The evidence, the rejection of which is complained of in the sixth assignment, should have been received. The contract provides that the plaintiff shall lay an extra strong lead water pipe, and the contractor substituted an iron pipe. tJnless we hold that the contractor had the right to thus change the specific stipulation in the agreement and use his own judgment instead of that of the defendants as to the pipe to be laid, we must require bim to pay to the defendants, not the difference between the iron and lead pipes, but the cost of laying a lead pipe as provided in the agreement. This is the proper measure of damages: Wade v. Haycock, 25 Pa. 382; Sticker v. Overpeck, 127 Pa. 446. The same principle sustains the seventh assignment.
*174' The contract provides that the owner may retain out of any payment due the contractor the amount of any lien or claim for which the owner of the premises may become" liable. The defendants offered in evidence the record of a lien filed against Mrs. Gamble and on which a scire facias had been issued. The court rejected the offer, for what reason does not appear, nor can we conceive. The eighth assignment is sustained. -
The offer of the amended affidavit of claim, the rejection of which constitutes the ninth assignment of error, did not propose to show that it in any way was contradictory of anything that Morgan had stated in the original affidavit. Had it done so the evidence would have been competent: 2 Wigniore on Evidence, sec. 1067. The assignment is dismissed. "
The defendants’ objection to the amendment of the affidavit of claim was manifestly not made on the ground that it offended the mechanic’s lien law, but that it was contrary to the rule of court regulating amendments. We must rule on the specific objection made at the trial: Danley v. Danley, 179 Pa. 170. If the objections now taken to the amendment had been made in the court below at the time they were offered, we would have a different question before us. Possibly the learned judge would have ruled differently had those objections been made. The court below is the best judge of its own rules and, seeing no plain error in allowing the amendment, the first assignment must be overruled-.
We do not deem it necessary to notice specially any of the other assignments of error. As, however, the case goes back for a retrial, it may not be out of place to suggest that over and beyond the- question of substantial performance is whether the contract was complied with to the satisfaction of the owner. That question seems to have been lost sight of in the trial of the cause. The reason may be attributable to the manner in which the defendants’ case' was presented. The contract provides that the contractor shall furnish all the materials and *175perform all the work to the satisfaction of the owner. We have uniformly upheld such contracts and required their observance. Under a contract of that character it is the duty of the contractor to perform to the satisfaction of the owner, and that is the standard by which the sufficiency of the work is to be tested. It is not for the court or the jury to determine whether the work is being done in compliance therewith, but solely for the owner to determine, and with his decision the contractor must comply. Of course the dissatisfaction of the owner which will defeat a recovery by the contractor must be real and genuine and not one prompted by caprice or bad faith or for the purpose of evading payment of the balance due the contractor. If the objections made by the owner are bona fide and not unreasonable or capricious they must be sustained. The question is generally for the jury, but, the evidence may be such as to require the court to withdraw the case from the jury.
If, as the case is presented on the next trial, the question of substantial performance is to be determined, the. court should give explicit instructions to the jury on the subject, defining clearly what is required to sustain a claim of that character. In Gillespie Tool Co. v. Wilson, 123 Pa. 19, this court, by Sterrett, J., said (p. 26): “The equitable doctrine of substantial performance is intended for the protection and relief of those who have faithfully and honestly endeavored to perform their contracts in all material and substantial particulars, so that their right to compensation may not be forfeited by reason of mere technical, inadvertent, or unimportant omissions or defects. It is incumbent on him who invokes this protection to present a case in which there has been no willful omission or departure from the terms of his contract. If he fails to do so, the question of substantial performance should not be submitted to the jury.”
The defendants suggest the insufficiency of the charge in certain respects. If any specific instructions were desired, the court should have been requested to give them. *176The good faith of the party in becoming dissatisfied with the contractor’s work like the question of substantial performance is generally one for the jury, and requests for instruction on the subject should not always conclude by asking for binding instructions. Usually a case does not turn on a single proposition and unless it does and that is controlling, a point should not conclude with a request for binding instructions. On the trial below, the defendants seem to contest the plaintiff’s claim on the ground of their dissatisfaction with the work done and materials furnished and because of the failure to complete the work in substantial compliance with the contract. As the case was presented, we cannot say that both questions were not for the jury.
The judgment is reversed with a venire facias de novo.