OPINION
¶ 1 Lamar Hopkins (Hopkins) and Joan B. Hopkins, individually and as trustees (the homeowners), appeal from a judgment, entered following a bench trial, by which the trial court ruled in favor of Uhrhahn Construction & Design, Inc. on its mechanic’s lien and breach of contract claims. 1 This case presents the issue, among others, of whether parties to a construction contract can orally agree on extra work to be performed when the written contract contains a provision requiring change orders or “extras” to be put in writing. We affirm the trial court’s breach of contract determination, reverse its mechanic’s lien and attorney fees rulings, and remand for a determination of the homeowners’ attorney fees, limited to those fees incurred in litigating the timeliness of the mechanic’s lien enforcement action.
BACKGROUND 2
¶2 This dispute involves Uhrhahn’s written proposals for the partial construction of the homeowners’ house, in which Uhrhahn estimated the cost and specifications for multiple projects it would complete. Each proposal stated that “[a]ny alteration or deviation from above specifications involving extra costs will be executed only upon written orders.” Hopkins signed the proposals under sections titled “Acceptance of Proposal.” 3
¶ 3 The trial court found that “Hopkins ... made several requests for additional work to the home which [were] not included in the initial proposals,” and that “Uhrhahn ... completed a substantial amount of the additional work requested.” Hopkins paid for work performed in connection with at least three of the additional requests, only one of which may have been in writing. 4
¶4 The trial court further found that “[djuring the initial bidding process, Mr. Hopkins requested installation of Durisol blocks on the home rather than standard cinder blocks.” “[He] represented to [Roger] Uhrhahn ... that the Durisol blocks were easier to install than traditional cinder
¶ 5 The dispute that ensued over the Duri-sol blocks led to the deterioration of the parties’ relationship. Hopkins refused to pay Uhrhahn for the extra cost incurred while installing the deformed blocks, and Uhrhahn refused to continue working if it was not paid. For reasons that are not entirely clear, Uhrhahn did continue to work on the house, probably because Roger Uhrhahn was under the impression that Hopkins would pay after Uhrhahn provided “a complete breakdown and analysis of all costs to date, including additions, with documentation.” After Uhrhahn provided the detailed information, Hopkins still refused to pay.
¶ 6 On March 28, 2003, Uhrhahn filed a complaint in district court “to collect a debt and to foreclose on a Mechanic’s lien” pursuant to Utah Code section 38-1-11, see Utah Code Ann. § 38-1-11 (Supp.2001). 5 The homeowners then filed an answer, counterclaim, and third-party complaint, alleging breach of contract and wrongful lien, and seeking punitive damages and attorney fees. After a bench trial, the court entered a memorandum decision on September 15, 2005, ruling in favor of Uhrhahn on its claims and against the homeowners on theirs. The trial court directed Uhrhahn to prepare findings of fact and conclusions of law following a damages hearing. After the damages hearing held on February 22, 2006, the homeowners objected to Uhrhahn’s proposed factual findings because the findings failed to indicate whether or not the mechanic’s lien was timely filed. The trial court entered its final factual findings and conclusions of law on June 7, 2006, without addressing the homeowners’ concern, and they now appeal the court’s final order.
ISSUES AND STANDARDS OF REVIEW
¶ 7 The first issue is whether the parties entered into a contract implied in fact that allowed them to agree orally to changes and extra work that deviated from the proposal agreement. Whether a contract implied in fact exists is generally considered a question of fact, and we review a trial court’s factual findings under the deferential clearly erroneous standard.
See Ryan v. Dan’s Food Stores, Inc.,
¶ 8 The second issue is whether the trial court’s damages award was proper given the lack of explicit factual findings regarding the award. “[An] award of damages is a factual determination that we review for clear error.”
Saleh v. Farmers Ins. Exch.,
¶ 9 The third issue is whether the trial court, albeit only implicitly, correctly determined that Uhrhahn timely filed its mechanic’s hen enforcement action under Utah Code section 38-1-11.
See
Utah Code Ann. § 38-l-ll(l)(b) (Supp.2001) (current version at Utah Code Ann. § 38-1-11(2) (Supp. 2007)). “[Statutory interpretation [presents] a question of law that we review for correctness.”
Sill v. Hart,
ANALYSIS
I. Contractual Issues
A. The Proposal Agreement Was a Contract
¶ 11 The homeowners argue that the trial court improperly determined that the proposal agreement was just an estimation of the work Uhrhahn would perform and not a contract. However, based on our review of the trial court’s findings of fact and conclusions of law, it appears that the trial court did not actually determine whether or not the proposal agreement was a binding contract. In the trial court’s memorandum decision, it indicated “that the proposals ... submitted ... were estimates of the amount that would be charged for the completion of the job.” Then, in its conclusions of law, it stated: “Even if the bid proposals constituted a contract, based upon Mr. Hopkins’ misrepresentations and conduct in continually requesting additional work ... Plaintiff was entitled to consider the contract voidable.” These statements indicate that the trial court did not decide the issue. Nonetheless, we agree with the homeowners that the court made an inconsistent statement when it concluded that Uhrhahn could recover “under both express and implied contracts.” But because the existence of a contract is a legal determination,
see Carter v. Sorensen,
¶ 12 The essential elements of contract formation were present here.
See Golden Key Realty, Inc. v. Mantas,
B. Contract Implied in Fact
¶ 13 The homeowners challenge the trial court’s determination that an implied-in-fact contract existed. They argue that the proposal agreement, which requires any changes to the original estimates and specifications to be put in writing, controls. They therefore assert that they do not owe Uhrhahn for work or monetary amounts that deviated from the original proposal agreement and were not reduced to writing. We disagree. We conclude that the trial court’s express and implicit factual findings show that through his conduct Hopkins, and therefore the homeowners, implicitly waived the provision requiring change orders to be put in writing and created a contract implied in fact that permitted changes to the original contract to be made orally.
¶ 14 First, we note that parties to construction contracts frequently make changes to the project as originally agreed upon. As stated in Corbin on Contracts,
[i]t must be a rare case in which parties to [construction] contracts do not find reason for variation or addition after the work is in progress. The owner changes his mind and the architect gives new directions. It is universal custom to rely upon the spoken word in such cases; the oral modification is enforced and compensation for “extra work” adjudged.
6 Arthur Linton Corbin,
Corbin on Contracts
§ 1294, at 203 (West Publishing Co.1962) (1951). Additionally, provisions in construction contracts requiring orders for extra work to be written are generally held to be for the protection of the owner, and the owner can waive such provisions.
See Campbell Bldg. Co. v. State Rd. Comm’n,
¶ 15 To prove that the owner intended to waive such a provision, “the evidence must be of a clear and satisfactory character and clearly show a distinct agreement that the work be deemed extra work and a definite agreement with the owner to pay extra for such extra work.”
Campbell Bldg. Co.,
¶ 16 Utah has recognized that such a provision can be waived explicitly or implicitly, with the requisite showing.
See Richards Contracting Co. v. Fullmer Bros.,
¶ 17 In
Richards Contracting,
the Utah Supreme Court upheld a jury verdict in favor of a subcontractor on his claim for damages against a contractor, even though he did not obtain the contractually required written au
¶ 18 We also conclude that the trial court correctly determined that an implied-in-fact contract was established through the parties’ conduct, which allowed the parties to agree on extra work orally. See id. (concluding that when “the parties decide on extras,” as happened in that case, “another contract in quasi contract arises based on a so-called quantum meruit theory”).
A contract implied in fact is the second branch of quantum meruit. A contract implied in fact is a “contract” established by conduct. The elements ... are: (1) the defendant requested the plaintiff to perform work; (2) the plaintiff expected the defendant to compensate him or her for those services; and (3) the defendant knew or should have known that the plaintiff expected compensation.
Davies v. Olson,
¶ 19 In contrast, in another case involving a similar issue,
ProMax Development Corp. v. Mattson,
¶20 In this case, as in Gary Porter, the trial court’s factual findings show that the parties’ conduct established an implied-in-fact contract. The trial court found that Hopkins “made several requests for additional work to the home,” and that “Uhrhahn ... completed a substantial amount of the additional work requested.” Additionally, the trial court stated that Hopkins “accepted] the benefits of [Uhrhahn]’s hard work.” Moreover, Hopkins paid at least three different invoices for the additional work, which invoices itemized the extra (or additional) work performed by Uhrhahn.
¶ 21 The first element is clearly satisfied because Hopkins repeatedly asked Uhrhahn to perform construction work that deviated from the proposal agreement. The second element is also satisfied because Uhrhahn’s conduct shows that it expected payment in return for the work it performed at Hopkins’s request. Hopkins and Uhrhahn had a business relationship, and Uhrhahn was hired by Hopkins to perform a job. Under these circumstances, Uhrhahn clearly expected to be paid for any work it performed at
C. Damages
¶22 The trial court did not discuss damages in its factual findings, and its determination that the' homeowners owed, Uh-rhahn damages totaling $62,386.29 therefore appears, at first blush, to spring out of nowhere. Ordinarily, although the precision of the amount expressed by the court inspires confidence at an intuitive level, such a situation would require us to remand for the entry of adequate findings of fact to support the damages award.
See Colonial Pac. Leasing Corp. v. J.W.C.J.R. Corp.,
¶ 23 We conclude that the trial court implicitly made findings that fully support its damages award to a mathematical certainty. “‘Unstated findings can be implied if it is reasonable to assume that the trial court actually considered the controverted evidence and necessarily made a finding to resolve the controversy, but simply failed to record the factual determination it made.’ ”
Id.
¶ 18 (quoting
Hall v. Hall,
¶ 24 In the trial court’s memorandum decision, it “note[d] that the factual overview and legal arguments presented in [Uhrhahn]’s Closing Argument Brief are generally consistent with this Court’s findings of fact and conclusions of law.” Additionally, the trial court later stated that “[b]ased on the foregoing and for reasons more specifically articulated in [Uhrhahnj’s Closing Argument Brief, the Court rules in favor of [Uhrhahn] and against the defendants!.]” The trial court then determined that Uhrhahn was “entitled to damages for work performed under both express and implied contracts with the defendants (and more specifically with Mr. Hopkins).” After referencing Uhrhahn’s preliminary damages calculation in its Closing Argument Brief, the trial court reserved ruling on the damages issue until it held a hearing on damages. At the February 22, 2006, damages hearing, Uhrhahn presented an amended version of the damages calculations originally set forth in its Closing Argument Brief, correcting an error it had con-cededly made. The trial court gave the homeowners time to object to those calculations, and they did so on March 1, 2006. In its May 23, 2006, ruling on the matter, after
¶ 25 The trial court’s September 15, 2005, memorandum decision clearly shows that it considered and agreed with Uhrhahn’s arguments and analysis with regard to its contractual claims, including its analysis regarding whether damages should be awarded. Moreover, the trial court’s damages ruling, entered on May 23, 2006, shows that it considered and necessarily found that Uhrhahn’s calculations, submitted at the damages hearing and in response to the homeowners’ objection, reflected the amount of damages owing. Accordingly, even though the trial court’s express factual findings do not detail how the damages award was calculated, we can readily determine how those numbers were reached by reviewing the calculations that Uhrhahn submitted, which the trial court considered and accepted. We additionally note that the amount of damages alloca-ble to the breach of contract claim was $62,386.29,
9
and that only $12,231.58 of this amount was attributable to extra work and extra costs, including work performed and costs incurred while installing the deformed Durisol blocks.
10
The calculations show that the remainder of the damages award was for work called for under the proposal agreement and for a lien Uhrhahn paid after Hopkins ordered supplies from a supplier using Uhrhahn’s account.
11
Finally, we emphasize
II. Mechanic’s Lien
A. Late Filing
¶26 The trial court, in its conclusions of law, determined that Uhrhahn could recover under both its mechanic’s lien and implied contract claims, and it awarded attorney fees under the mechanics’ lien statute. The homeowners argue that the trial court erred because no evidence was presented showing that Uhrhahn timely filed its action to enforce the mechanic’s lien. They further assert that the trial court’s legal conclusion that a valid mechanic’s lien existed was not supported by its factual findings because the findings do not indicate the last date on which Uhrhahn performed work or delivered materials.
¶ 27 We conclude — and Uhrhahn concedes — that the express and implied factual findings do not indicate the last date of work or delivery on the Hopkins project. Rather, the factual findings just discuss the substantive issues necessary to prove the mechanic’s lien and breach of contract claims, and then the trial court states the legal conclusion that “[Uhrhahn] has satisfied the requisite elements of Utah Code Ann. § 38-1-1, et seq.”
¶ 28 The applicable version of Utah Code section 38-l-ll(l)(b) provided that “[a] lien claimant shall file an action to enforce the lien filed under this chapter within: ... 180 days from the date the lien claimant last performed labor and services or last furnished equipment or material for a residence, as defined in Section 38-11-102.” Utah Code Ann. § 38 — 1—11 (1)(b) (Supp.2001) (current version at Utah Code Ann. § 38-1-11(2) (Supp.2007)). The homeowners assert that Uhrhahn’s trial testimony established that the last date any work was performed on the residence was September 26, 2002. Uhrhahn filed its complaint and mechanic’s lien enforcement action on March 28, 2003. Thus, if September 26 was the last day of work, the mechanic’s lien action was filed three days late, i.e., 183 days after the last date of work. Rather than countering the homeowners’ argument in its brief by providing record cites that show a different last date of work or delivery, Uhrhahn asks that we remand the case for further proceedings to resolve this issue. It seeks “an evidentiary hearing before a new judge” where “the parties [could] point to all evidence presented at trial” on the issue and then the judge could make appropriate factual findings.
¶ 29 Generally, when a trial court fails to make factual findings on a material issue, such failure constitutes reversible error, and we remand to the trial court to enter the necessary findings unless we determine that such error is harmless, i.e., the undisputed evidence clearly establishes the missing findings or the missing findings may reasonably be implied.
See State v. Ramirez,
¶ 30 The homeowners argued at length regarding this issue, and their arguments stand unrefuted by Uhrhahn. While alleging at oral argument that some facts in the record support a finding that the mechanic’s lien was timely filed, Uhrhahn did not provide any record cites for such evidence. We accordingly conclude that Uhrhahn did not adequately brief this issue. Without particularized support for its contention that evidence of record contradicts the September 26, 2002, date to which the homeowners point us, we are unable to determine whether affirmance
B. Attorney Fees
¶ 31 In light of our disposition of the mechanic’s hen issue, we also reverse the trial court’s award of attorney fees to Uhrhahn under section 38-1-18(1). See Utah Code Ann. § 38-1-18(1) (Supp.2001) (current version at Utah Code Ann. § 38-1-18(1) (2005)). Additionally, the trial court’s determination that Uhrhahn “is further entitled to an order for the s[ale] of the property at issue pursuant to U.C.A. § 38-1-15,” see id. § 38-1-15 (Supp.2001) (current version at Utah Code Ann. § 38-1-15 (2005)), is also vacated as the mechanic’s hen enforcement action was not shown to be timely filed.
¶ 32 The homeowners assert that if they prevail on the timeliness issue on appeal, they should be awarded attorney fees under the mechanics’ hen statute. See id. § 38-1-18(1) (Supp.2001). Utah Code section 38-1-18(1) provided:
(1) Except as provided in Section 38-11-107 and in Subsection (2), in any action brought to enforce any hen under this chapter the successful party shall be entitled to recover a reasonable attorneys’ fee, to be fixed by the court, which shall be taxed as costs in the action.
Id.
This “provision mandates that the successful party be allowed to recover reasonable attorney fees,” and therefore “courts do not have discretion to decide whether to award reasonable attorney fees to the ‘successful party.’ ”
A.K. & R. Whipple Plumbing & Heating v. Guy,
¶33 At oral argument, Uhrhahn argued that if we conclude it did not timely file its mechanic’s lien enforcement action, then the trial court did not have jurisdiction to hear the issue or award attorney fees under the statute. Accordingly, it asserts that the homeowners would not be entitled to attorney fees for prevailing on appeal. The homeowners, on the other hand, argued that because section 38-1-18 does not mention jurisdiction, if they successfully defend against the action on any basis they are entitled to attorney fees. In
AAA Fencing Co. v. Raintree Development & Energy Co.,
¶34 The more interesting issue in this case is whether the homeowners actu
¶ 35 The Utah Supreme Court has previously determined that a defendant is entitled to attorney fees when the plaintiff voluntarily dismisses its forfeiture action before the district court had a chance to consider it.
See State v. One Lot of Pers. Prop.,
The fact that the [plaintiff] recognized the apparent weakness of its claim and voluntarily dismissed it before the district court had an opportunity to do likewise does not relieve the [plaintiff] of its obligation to reimburse the [defendants] for them attorney fees. Any other rule would be fundamentally unfair to those defendants who are required to incur substantial fees defending a plaintiffs non-meritorious claims up to the point of the plaintiffs voluntary dismissal.
Id.
¶ 19. Based on the logic of
One Lot,
we conclude that even though the homeowners’ success on the mechanic’s lien issue was a result of the errors or inaction of others, they were the successful party for purposes of Utah Code section 38-1-18. We accordingly remand for a determination of their attorney fees incurred
solely
in refuting the timeliness of the mechanic’s lien enforcement action— the only issue on which they can be said to have prevailed.
See Ellsworth Paulsen Constr. Co. v. 51-SPR, LLC,
CONCLUSION
¶ 36 We affirm the trial court’s determination that Hopkins, through his conduct, created an implied-in-fact contract that allowed the parties to orally agree to extras or changes to the original proposal agreement. We also affirm the trial court’s damages award because it is supported by the trial court’s implicit factual findings. We reverse the trial court’s determination that Uhrhahn prevailed on its mechanic’s lien enforcement action because Uhrhahn failed to adequately brief the timeliness issue and because no factual findings, explicit or implied, support a determination that the mechanic’s lien enforcement action was timely filed. Likewise, we vacate the trial court’s award of attorney fees to Uhrhahn under the mechanics’ lien statute since it is not the successful party as concerns the lien enforcement action. Finally, we remand to the trial court for a determination of the homeowners’ attorney fees, confined to those fees incurred in defending against the timeliness of the mechanic’s lien enforcement action, since they are the sue-
Notes
. At trial, Uhrhahn Construction & Design, Inc. was the plaintiff, and Roger Uhrhahn was the third-party defendant. We do not address the trial court’s rulings on the homeowners' counterclaim or third-party claims because the homeowners did not brief those issues. Accordingly, we refer to Uhrhahn Construction & Design, Inc., the only appellee whose arguments we address, as "Uhrhahn.” At times, we also refer to Roger Uhrhahn, individually, to discuss his interaction with Hopkins.
. One of the homeowners’ challenges on appeal is that the trial court’s factual findings do not support its legal conclusions. As they do not challenge the validity of the factual findings themselves, we accept the trial court's factual findings as true and analyze its legal conclusions based on those findings.
See Carsten v. Carsten,
. Hereinafter, we will refer to the accepted proposals collectively as the "proposal agreement.”
. The homeowners state in their reply brief that “the parties followed the contractually mandated procedure on at least one occasion” and that "Hopkins paid for the additional work set forth in a written change order.” We are not sure to which change order they are referring. However, we note that Uhrhahn’s records, which were an exhibit to its closing argument brief, show that Uhrhahn sent three invoices to Hopkins, labeled change orders 1, 2, and 3, and that these invoices were paid.
. The dispute at issue arose during the fall of 2002, and Uhrhahn filed its mechanic's lien in March 2003. At trial, the court and parties appropriately relied on the version of the mechanics’ lien statute then in effect, and we do the same. Section 38-1-11 has subsequently been amended several times. See Utah Code Ann. § 38-1-11 amend, notes (2005 & Supp.2007).
. Despite the ambiguity in the trial court's ruling on this issue, its main determinations — that a contract implied in fact existed and that Uhrhahn could recover damages for the extra work it performed at Hopkins’s request based on the implied contract — remain valid.
7. Whether the parties were competent is not in dispute.
. There is no dispute that some of the work Uhrhahn performed, and for which it was paid, was work that was not included in the proposal agreement.
. The trial court awarded a total of $119,991.06 in damages, attorney fees, costs, and prejudgment interest, itemized as follows: (1) $62,386.29 in principal damages; (2) $36,945.86 in attorney fees and costs pursuant to the mechanics’ lien statute; and (3) $20,658.91 in prejudgment interest.
. The trial court’s memorandum decision shows that it awarded damages for the expenses Uh-rhahn incurred while installing the Durisol blocks because Hopkins provided deformed blocks and misrepresented the ease of installation and the length of time it would take to install the blocks, which caused Uhrhahn to underestimate the amount of money it would take to complete the project. In the trial court’s legal conclusions, in ruling against the homeowners on their breach of contract and wrongful lien claims, the court stated that “[e]ven if the bid proposals constituted a contract,” Uhrhahn “was entitled to consider the contract voidable” because of "Mr. Hopkins’ misrepresentations and conduct."
While the homeowners generally challenge the trial court’s damages award as including extra expenses that were not in the proposal agreement or in later written agreements, their arguments focus on the trial court’s conclusion that an implied-in-fact contract existed regarding change orders or work that deviated from the proposal agreement. Their brief does not specifically address the separate issue of whether Uh-rhahn was entitled to recover the extra expense it incurred in installing the Durisol blocks, a project that was originally included in the proposal agreement. The homeowners refer to the legal conclusion discussed above to point out the trial court's inconsistent statements about whether the proposal agreement was a contract, and to argue that if the contract was considered voidable by Uhrhahn, then the mechanic’s lien could not be valid because there was no underlying contract. As indicated in section 1(A) of this opinion, we have determined that the proposal agreement was a contract. And it is not necessary for us to address the homeowners’ argument regarding the effect this statement has on the validity of the mechanic’s lien in light of our disposition of that issue under section 11(A) of this opinion. Finally, because the homeowners do not adequately brief the misrepresentation issue or even specifically discuss whether the extra expenses for installing the Durisol blocks were appropriately included in the damages award, we do not further discuss the issue and affirm the trial court’s inclusion of those expenses in its damages award. See Valcarce v. Fitzgerald, 961 P.2d305, 313 (Utah 1998).
.Because, as we previously concluded in section 1(A) of this opinion, the proposal agreement was a contract, the award of damages for unpaid work under the original agreement is sustainable.
See DeBry v. Noble,
. At that time, section 38-1-11 required the enforcement action to be brought within twelve months after the completion of the original contract.
See AAA Fencing Co. v. Raintree Dev. & Energy Co.,
