If your contractor is asking for more money after signing the contract, you are usually not required to pay it. Contract law binds both sides to what they agreed to, so a contractor who simply wants a bigger paycheck for the same work has no claim on you. There are real exceptions: owner-requested scope changes, hidden site conditions the contract didn’t account for, extreme market disruptions covered by a force majeure or escalation clause, and a handful of others. The question is always whether the extra money is tied to something genuinely outside the original deal, or whether it is pressure to renegotiate a price the contractor now regrets.
Why the Original Price Usually Sticks
The principle doing the work here is the pre-existing duty rule. A promise to do something you are already obligated to do is not valid consideration for a new promise. If a contractor agreed to install your kitchen for $30,000, they cannot later insist on $35,000 for the same kitchen and call it a binding modification. You already had their promise. Nothing new supports the higher price, so the new “agreement” is unenforceable.
The rule has one important limit. The Restatement (Second) of Contracts recognizes that a modification without new consideration can still be enforceable when it is “fair and equitable in view of circumstances not anticipated by the parties when the contract was made.”1H2O Open Casebook. Restatement Second Contracts 89 – Modification of Contract If the contractor opens a wall and finds extensive termite damage nobody knew about, a price bump to handle that genuinely new problem can hold up. The controlling word is “unanticipated.” A contractor who underestimated their own labor or overhead does not meet the standard.
When a Price Increase Is Actually Legitimate
A handful of situations can justify paying more. Work through them in order and see whether any fit what your contractor is describing.
You Asked for Something Different
Change orders are the most common reason a price goes up, and they are rarely controversial when handled right. You decide on hardwood floors instead of tile. Your architect revises the layout. The scope changed, so the price changes. Well-drafted contracts spell out how this works: who can authorize a change, how the cost adjustment is calculated, and what documentation is required. Under the widely used AIA A201 General Conditions, a change order must be agreed in writing by both owner and contractor, covering price and timeline.2AIA Contract Documents. Contract Basics for Contractors: Payment Processes
The trap here is the informal change. A constructive change happens when the owner informally directs work beyond the original scope without issuing a formal change order. Rejecting work that meets specifications, insisting on higher-quality materials than the contract calls for, or pushing an interpretation of the plans that adds work all qualify. To recover for a constructive change, the contractor must show the extra work was outside the original scope, that someone with authority directed it, and that real additional costs followed. If you casually told the crew to “make it look nicer” and they upgraded finishes, you may owe for that. Verbal go-aheads on site are where most disputes start.
Something Unexpected Was Hidden in the Site
Conditions no one could see when the contract was signed are among the most legitimate reasons costs go up. Rock where the soil report showed dirt. Asbestos behind drywall that was not disclosed. Groundwater flooding an excavation that should have been dry.
In federal construction, the standard Differing Site Conditions clause covers two categories: conditions that differ materially from what the contract documents indicated, and conditions of an unusual nature that differ from what anyone would normally expect for that type of work. When either applies, the contractor is entitled to an equitable adjustment in price and time, but only if they give written notice promptly and before disturbing the conditions.3Acquisition.GOV. FAR 52.236-2 – Differing Site Conditions Private contracts often adopt similar language. The notice requirement is not a technicality. A contractor who finds an unexpected condition, fixes it silently, and asks for more money weeks later has a much weaker claim than one who stopped, documented, and put you on notice first.
An Event Outside Anyone’s Control
A hurricane that floods the site, a government order halting construction, a pandemic that shuts down supply chains: these may trigger the force majeure clause in your contract. Clauses vary. Some list specific qualifying events; others use broad language excusing performance for any cause beyond the parties’ control.4Bloomberg Law. Commercial, Comparison Table – Force Majeure and Related Contract Defenses in Selected States Courts look at the exact language, not just the severity of the event.
Where the contract has no force majeure clause, a contractor may argue impracticability. The Restatement (Second) of Contracts discharges the duty to perform when an unexpected event, whose non-occurrence was a basic assumption of the contract, makes performance impracticable through no fault of that party.5H2O Open Casebook. Restatement Second of Contracts 261 – Discharge by Supervening Impracticability The bar is high. Impracticable means extreme and unreasonable difficulty, not more expensive than expected. A routine increase in lumber prices does not qualify. A 300% spike caused by a trade embargo might. For contracts involving the sale of goods, the UCC takes a similar approach, excusing a seller’s non-delivery when performance becomes impracticable due to an unforeseen event both parties assumed would not happen; the seller must notify the buyer promptly and allocate remaining capacity fairly.6Legal Information Institute. UCC 2-615 – Excuse by Failure of Presupposed Conditions
Your Contract Actually Allows a Price Adjustment
Some contracts address material cost increases head-on with an escalation clause. These provisions tie the contract price to actual market conditions, adjusting payments when the cost of key materials like steel, lumber, or concrete rises above a specified threshold. The adjustment is typically calculated using a published index, such as the Producer Price Index or the Engineering News-Record Construction Cost Index, or based on documented actual cost increases with supporting invoices. If your contract contains one of these clauses and the request is tied to verified market data and calculated per the formula, it is legitimate. If your contract does not contain one, the contractor accepted the price risk when they signed.
When the Demand Crosses the Line Into Duress
There is a difference between a contractor explaining why hidden conditions justify more money and a contractor threatening to walk off the job unless you agree to a price hike. The second may be economic duress, which can make any modification you sign under that pressure voidable.
Economic duress requires a wrongful threat that eliminates your ability to exercise free will. A contractor refusing to continue with work already covered by the contract, knowing your half-finished project will suffer serious damage or delay, is the textbook example. Courts also require that you had no reasonable alternative. If you could have hired another contractor and pursued normal breach-of-contract remedies without catastrophic loss, the duress argument weakens. A mere threat to breach is not duress by itself when you have practical options.
If you do sign a price increase under pressure just to keep the project moving, document everything. Note the circumstances, save texts and emails showing the threat, write down what was said and when. A modification signed under genuine economic duress can be rescinded later, but you will need evidence.
What to Do Right Now
Before agreeing to anything, take these steps.
Pull out the contract and read the scope of work, the change order clause, any differing site conditions clause, any force majeure or escalation clause, and the dispute resolution section. Match the contractor’s specific reason for the increase against these provisions. If the reason falls into one of the legitimate categories above and the contract’s procedure was followed, the request likely has merit. If the reason is really “my costs came in higher than I bid,” the pre-existing duty rule is on your side.
Ask for the request in writing, with a breakdown. What specifically changed? What is the added cost of each item? What documentation supports it (invoices, index data, photographs of the unexpected condition)? A legitimate request survives this. A pressure tactic often does not.
Do not approve anything verbally. Even if you decide the request is fair, insist on a signed written change order stating the added cost and the timeline impact before the changed work begins.
Keep the leverage the contract already gave you. Most construction contracts include retainage, where the owner withholds a percentage of each progress payment (typically 5% to 10%) until substantial completion. Retainage is released after final inspection or after a specified period.2AIA Contract Documents. Contract Basics for Contractors: Payment Processes A meaningful chunk of the contractor’s compensation still in your hands is a powerful reason for them to work things out.
If the disagreement will not resolve informally, follow whatever dispute process your contract requires. Many construction agreements require mediation first, then arbitration or litigation. Mediation is faster and cheaper than court, and the mediator does not impose a decision, so both sides keep control of the outcome. If your contract contains a mandatory arbitration clause, you are generally bound by it unless a court finds the clause itself unconscionable. For smaller disputes, small claims court is often available; jurisdictional caps vary by state, commonly falling somewhere between $2,500 and $25,000, and you typically do not need a lawyer.
If the Contractor Walks Off
When a contractor stops working and demands more money for scope the original contract already covers, that is potentially a breach. Your primary remedy is compensatory damages: the cost of hiring a replacement contractor to finish, minus whatever you had not yet paid the original contractor. If the replacement costs more, the original contractor is liable for the difference.
Consequential damages may also be available for foreseeable losses flowing from the breach, such as rental costs if you cannot move into your home on schedule, or lost business income if a commercial project stalls. Courts sometimes award these but require that the losses were reasonably foreseeable when the contract was signed. Specific performance, where a court orders the contractor to finish, is rare in construction; courts are reluctant to supervise ongoing work relationships.
Breach cuts both ways. If you refuse to pay for legitimately changed conditions or owner-directed scope changes, the contractor may have a valid claim against you. The question is always whether the additional work falls inside or outside what the original contract covered.
The Contractor’s Leverage You Should Know About
Contractors, subcontractors, and material suppliers can file a mechanic’s lien against your property when they believe they have not been paid for work or materials. Once filed, the lien clouds your title, and you generally cannot sell or refinance the home until it is resolved.
Every state has its own mechanic’s lien statute with specific requirements for preliminary notices, filing deadlines, and enforcement. Filing deadlines after the last day of work typically range from 60 to 150 days depending on the state. The contractor usually must also file a lawsuit to enforce the lien within a separate, often shorter, window, or the lien expires automatically.
The existence of lien rights does not mean the contractor is right about what they are owed, and filing an inflated or fraudulent lien can expose the contractor to penalties. The point is that ignoring a payment dispute does not make it go away. Address it, in writing, promptly.
One Boundary: The FTC Cooling-Off Rule
If the contract itself is only a day or two old and you signed it at your home, at your workplace, or at a contractor’s temporary location like a home show, federal law may give you a three-day window to cancel the entire deal with no penalty. The FTC’s Cooling-Off Rule requires the seller to give you two copies of a cancellation form and a contract or receipt explaining your right to cancel, in the same language used during the sales presentation.7Federal Trade Commission. Buyer’s Remorse: The FTC’s Cooling-Off Rule May Help The right lasts until midnight of the third business day after the sale; Saturday counts, Sundays and federal holidays do not. If the contractor never provided cancellation forms, a written cancellation letter postmarked within the three-day window works instead. The rule does not apply to sales under $25 or to repairs you specifically requested.
This rule will not help with a price increase that surfaces weeks into a project. It matters only if the contract is fresh and was signed in one of those settings.
A contractor asking for more money is not automatically acting in bad faith. Hidden conditions, owner-requested changes, and genuine market disruptions can all justify a legitimate adjustment. The contract itself, read carefully, tells you whether a particular request has merit. When it does not, the pre-existing duty rule and your available remedies mean you are not stuck paying for something you never agreed to.