Quantum Meruit and Unjust Enrichment for Contractors: Getting Paid When the Contract Doesn't Cover the Work (2026)
✓ Verified against state statutes · Reviewed November 2026 · By Michael Evan — Founder · 50 states · 799 rules
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Key Takeaways
→ It fills the gaps a contract leaves. No agreed price, unwritten extras, or a contract that fell apart. → A real contract usually wins. If an express contract covers the work, you sue on the contract, but you can plead quantum meruit in the alternative. → You recover reasonable value, proven with invoices, market rates, and records, not your hoped-for price. → Suing the owner as a sub is hard if the owner already paid the GC. A mechanics lien usually does that job better. → Licensing can kill the claim. California (B&P § 7031) and Florida (§ 489.128) bar unlicensed contractors from recovering. An electrical sub has a signed subcontract for the base scope on a restaurant buildout. Halfway through, the owner’s designer moves the kitchen line, and the GC’s superintendent tells the sub to reroute circuits and add two panels. Nobody writes a change order. The sub does the work, invoices $31,500 for it, and the GC says the extra work “isn’t in the contract.” The GC is half right. The extra work isn’t in the contract. That is exactly why the sub may have a claim outside it. When work is requested, performed, and accepted without an enforceable price, the law can imply a duty to pay what the work was reasonably worth. That claim is called quantum meruit, and its close cousin is unjust enrichment. This guide explains when contractors can use these claims, when they can’t, and how to prove the number. It is part of The Mechanics Lien Management Method: secure your lien and bond rights first, then choose the right claim for the lawsuit. For the deadlines on the lawsuit itself, see Breach of Contract Statute of Limitations by State . For what happens after you win, see How to Collect a Judgment by State .
Quantum Meruit vs. Unjust Enrichment vs. Breach of Contract
Quantum meruit and unjust enrichment are “quasi-contract” claims. The law treats the defendant as if it had promised to pay, because fairness requires it, even though no enforceable promise covers the work. Courts in many states blur the two, and contractors usually plead them together. The differences that matter: Breach of contract Quantum meruit Unjust enrichment Based on An enforceable agreement Work requested and accepted A benefit unfairly kept You recover The contract price and damages Reasonable value of the work The value of the benefit Who you sue The party you contracted with The party that asked for the work Whoever got the benefit, sometimes the owner Blocked by Defenses to the contract An express contract on the same work An express contract, or the owner already paying None of these is a lien. A mechanics lien is a claim against the improved property, and it has its own short deadline. A quasi-contract claim is a personal claim against a party, and it is only worth what that party can pay.
The Elements a Contractor Has to Prove
1 You provided labor or materials in good faith 2 The defendant requested or accepted the work 3 You expected to be paid, and it knew that 4 The reasonable value of the work State formulations differ, but most quantum meruit tests come down to those four points. Unjust enrichment is usually stated as a benefit conferred on the defendant, the defendant’s knowledge or appreciation of it, and retention of the benefit under circumstances that make it unfair to keep without paying. Element three trips up contractors who did favors. Work done as a courtesy, or to win future business, usually doesn’t support a claim. Written proof that you expected payment, such as an estimate, a texted price, or an invoice sent at the time, does a lot of work here.
Six Situations Where Contractors Use Quantum Meruit
Handshake jobs with no agreed price. The owner or GC said “go ahead” but never agreed to a number. With no contract price, reasonable value is the measure. See Can You File a Mechanics Lien Without a Written Contract? Extra work outside the written scope. Like the electrical sub above. If the work falls outside the contract, the contract doesn’t bar a claim for it. Courts in many states also find that a written change-order requirement was waived when the owner or GC directed the extra work and knew it was being done, but don’t count on that. Read the changes clause. The other side breached and you stopped work. When the owner or GC materially breaches, for example by refusing to pay a progress draw, many courts let the contractor choose between contract damages and the reasonable value of the work performed. The contract turned out to be unenforceable. Missing essential terms, an unsigned proposal, or a statute-of-frauds problem can sink the contract claim. Quantum meruit can stand in, unless the reason the contract fails is a licensing or consumer-protection statute that also bars quasi-contract recovery. Work started on a letter of intent. If the formal contract was never signed and the project fell apart, the letter of intent may not be a binding contract on price. Quantum meruit can cover the work done in the meantime. You never finished, and the contract doesn’t say what partial work is worth. If you substantially performed, you usually sue on the contract for the price less the cost to finish. If you didn’t, some states still allow recovery of the value of the work, minus the other side’s damages from your nonperformance. In every one of these, the lien deadline is still running. The fact that the price is disputed doesn’t stop the clock. Calculate your date with the Mechanics Lien Management State System .
The Express Contract Rule and Pleading in the Alternative
The most common defense to a quantum meruit claim is simple: there is a contract. In most states, a valid express contract covering the same subject matter bars a quasi-contract claim between the same parties. The law won’t imply a promise to pay reasonable value when the parties already agreed on what would be paid. That doesn’t mean you must pick one claim on day one. Federal Rule of Civil Procedure 8(d)(2)–(3) allows alternative and inconsistent claims, and most states have a similar rule. A contractor can sue for breach of contract and, in a separate count, for quantum meruit and unjust enrichment in case the contract is found invalid or not to cover the disputed work. You generally can’t recover twice, and once a court finds a valid contract covers the work, the quasi-contract count usually falls away. Two points matter for subs. First, the bar usually applies between the parties to the contract. A sub’s subcontract with the GC doesn’t automatically bar a claim against the owner, though the owner has other defenses, covered next. Second, contract terms can still matter: a pay-if-paid clause or a waiver in the subcontract can limit what you can recover, and some courts won’t let quantum meruit undo a risk the contract assigned to you.
Can a Sub or Supplier Sue the Owner for Unjust Enrichment?
This is the question unpaid subs and suppliers ask most when the GC disappears. The owner got the building. The owner has money. Why can’t the sub sue the owner directly? Sometimes it can, but the claim is weaker than it looks. Courts in many states hold that an owner who paid the GC in full for the work is not unjustly enriched, because the owner paid once for what it got. Making the owner pay the sub as well would make it pay twice. Some courts add other requirements, such as showing the sub can’t collect from the GC, or that the owner did something to induce the work. The claim is strongest when the owner has not paid anyone for the sub’s work and is simply keeping it. That is exactly the problem the mechanics lien statutes were written to solve. In many states, a properly noticed lien lets a sub or supplier reach the property even when the owner has paid the GC, subject to that state’s rules on payments and preliminary notice. On public jobs, where liens usually aren’t available, the payment bond does the same job; see payment bond claims . An unjust enrichment claim against the owner is a backup, not a plan. Protect the lien with timely preliminary notice and a timely filing.
How to Prove Reasonable Value
A quantum meruit award is usually measured by the market value of the work, meaning what it would cost to get the same labor and materials from a contractor in that trade and area. It is not automatically your invoice, and it is not the profit you lost on the rest of the job. Build the record with: Time and labor records: daily logs, timesheets, and crew sizes for the disputed work. Material invoices: supplier bills and delivery tickets tied to the job. Your standard rates: what you charge other customers for the same work, with past invoices to show it. Market evidence: published unit costs, competing bids, or an estimator’s testimony. Their own documents: an estimate or proposal they reviewed, a superintendent’s email directing the work, or a schedule of values. Photos and drawings showing what was built and that it was used. Can you recover more than the contract price? When the other side breaches a contract that was a losing deal for you, courts are split on whether restitution can exceed the contract price. The Restatement (Third) of Restitution and Unjust Enrichment § 38 caps it at the price of the work under the parties’ agreement, and many courts follow that approach. Expect the contract price to be treated as strong evidence of value either way. Lien statutes can take a similar approach. California, for example, limits a mechanics lien to the lesser of the reasonable value of the work and the price agreed with the party that contracted for it (Cal. Civ. Code § 8430).
Licensing and Home Improvement Traps
Quasi-contract is not a way around a licensing statute. Where a state says an unlicensed contractor can’t be paid for work that requires a license, courts usually apply that rule to quantum meruit claims too. California: B&P Code § 7031 An unlicensed contractor can’t bring or maintain any action to collect compensation for work that requires a license, regardless of the merits, and California courts apply the bar to quantum meruit. Under § 7031(b), the person who used the unlicensed contractor can even sue to recover what it already paid. Florida: Fla. Stat. § 489.128 Contracts entered into by an unlicensed contractor are unenforceable in law or in equity by the contractor. Florida also denies lien rights to unlicensed contractors (Fla. Stat. § 713.02(7)). Connecticut: Home Improvement Act, C.G.S. § 20-429 A home improvement contract isn’t valid or enforceable against the owner unless it is in writing, signed, and includes the required terms. Connecticut courts have generally barred quantum meruit recovery on noncompliant contracts too, with an exception where the homeowner acted in bad faith. Many other states have licensing or home improvement statutes with their own consequences. Before you rely on quantum meruit, check whether your trade and the job required a license or a written contract in that state. Our contractor license and lien rights by state guide covers the licensing side of lien rights.
Deadlines and Attorney’s Fees
Statute of limitations. Many courts apply the period for oral or implied contracts to quantum meruit, and that period is often shorter than the written-contract period. California, for example, gives 2 years on oral contracts against 4 on written ones. The rule also changes the math in Colorado, where a 6-year period applies to liquidated or determinable sums (C.R.S. § 13-80-103.5), but a reasonable-value claim may not qualify. Check your state in our 50-state statute of limitations table . Attorney’s fees. The usual American rule is that each side pays its own fees unless a contract or statute says otherwise, and a contract’s fee clause may not apply to a claim outside the contract. Some statutes fill the gap. Texas allows fees on claims for rendered services, performed labor, and furnished material (Tex. Civ. Prac. & Rem. Code § 38.001), and Texas courts have applied it to quantum meruit claims. Some lien acts and prompt payment acts also shift fees; see mechanics lien attorney fees by state .
Common Mistakes
1. Relying on quantum meruit instead of the lien A quasi-contract claim is a personal claim against a party that may be broke. Miss the deadline and you lose your lien rights entirely, along with your claim against the property. 2. Doing extra work without a paper trail A one-line email confirming who directed the work, and that it is extra, turns a he-said dispute into evidence. Send it before you start. 3. Pleading only quantum meruit If there is any contract, plead breach of contract too, with quantum meruit in the alternative. A court that finds a contract will dismiss a standalone quasi-contract claim. 4. Pricing the claim at your wish-list number Reasonable value is what the market would pay for the work. Inflated numbers cost credibility. Tie every line to a record. Before suing, send a dated demand that states the reasonable-value number and how you got it; see our construction payment demand letter template and Contractor Won’t Pay Me? 9 Steps to Get Paid .
Frequently Asked Questions
What is quantum meruit in construction?
Quantum meruit is Latin for "as much as he has deserved." In construction, it is a claim for the reasonable value of labor and materials you provided when there is no enforceable contract price to sue on. Courts use it when the job was done on a handshake with no agreed price, when extra work fell outside the written scope, or when the contract ended before the work was finished. You recover what the work was reasonably worth, not necessarily what you hoped to charge.
What is the difference between quantum meruit and unjust enrichment?
They are closely related, and many courts treat them as two names for the same equitable idea. Quantum meruit focuses on what your work was worth, measured by the reasonable value of the services and materials. Unjust enrichment focuses on what the defendant gained and whether keeping it without paying is unfair. In practice, contractors usually plead both, and the measure of recovery in a construction case is usually the reasonable value of the work.
Can I sue for quantum meruit if I have a written contract?
Usually not for the same work. In most states, an express contract that covers the same subject matter bars a quasi-contract claim, because the law will not imply a promise where the parties made a real one. But you can usually plead quantum meruit in the alternative, in case the contract turns out to be invalid or not to cover the work, and you can often use it for extra work that falls outside the contract's scope.
Can a subcontractor sue the property owner for unjust enrichment?
Sometimes, but it is hard. The owner usually has no contract with the sub, so the sub must show the owner received a benefit and that keeping it without paying would be unjust. Many courts hold that an owner who already paid the general contractor in full is not unjustly enriched, even if the GC never paid the sub. The claim is stronger when the owner has not paid for the work. A mechanics lien is usually the better tool against the owner's property.
How is reasonable value proven in a quantum meruit claim?
With evidence of what the work was worth on the market: your invoices and time records, the rates you and other contractors normally charge for that trade in that area, material costs with supplier invoices, any estimate or bid the other side reviewed, and sometimes testimony from an estimator or other expert. Courts generally look at the market value of the work, not just your cost, and not the profit you would have made on a bigger job.
Can an unlicensed contractor recover in quantum meruit?
Often not. California Business and Professions Code section 7031 bars an unlicensed contractor from suing for compensation for work that requires a license, and courts apply that bar to quantum meruit claims too. Florida Statutes section 489.128 makes contracts by unlicensed contractors unenforceable in law or in equity by the contractor. Other states have their own licensing and home improvement rules, so check yours before you do work that requires a license.
How long do I have to bring a quantum meruit claim?
It depends on the state. Many courts apply the statute of limitations for oral or implied contracts, which is often shorter than the written-contract period, but the rule varies. The period usually starts running when payment was due and not made. A quantum meruit claim does not extend your mechanics lien deadline, which is usually measured in days or months, so calculate and protect the lien deadline first.