Construction Contracts: 9 Clauses That Decide Who Pays When It Goes Wrong

Most owners negotiate hard on price and sign the contract unread. That's backwards. The price is a number that will change. The contract is the instrument that decides who absorbs the change — and unlike the price, it isn't negotiable after signature.

Here are the nine clauses that determine that, roughly in the order they'll come up on a real project.

1. Scope defined by reference — and an order of precedence

A contract that describes the work in a paragraph has not defined the work. The scope lives in the drawings, the specifications, and the schedule of values, and the contract has to incorporate them explicitly as numbered exhibits.

Then the part nobody adds: an order of precedence clause. Drawings and specifications will contradict each other — that isn't a defect, it's a certainty. Without a stated hierarchy, every contradiction becomes a negotiation, and the party that discovers it first gets to choose the interpretation that suits them.

What to require: an exhibit list with document titles, revision numbers, and dates, plus a clause stating which controls when they conflict.

2. Contract type — and what it silently does to your risk

Lump sum / fixed price. The contractor carries the cost risk and prices that risk into the number. Fine, provided the design is complete. On an incomplete design, a lump sum is fiction — the gaps come back as change orders.

Cost-plus. You carry the cost risk entirely. There is no incentive to be efficient unless the contract creates one. Never sign cost-plus without a cap.

GMP (guaranteed maximum price). Cost-plus with a ceiling. The questions that decide whether it's actually protective: what's in the contingency, who controls it, what happens to savings below the GMP, and which cost categories are excluded from the cap.

The contract type is usually chosen by default rather than deliberately. It's the single largest risk decision in the document.

3. Allowances and contingency

An allowance is a placeholder for a decision you haven't made — tile, fixtures, appliances. It is not a price. When the selection is made, you pay the difference, plus markup.

Three things must be written down: what the allowance covers (material only, or material plus labor and installation), what markup applies to overages, and what happens if you come in under.

Contingency is separate and more dangerous, because it's real money sitting in the contract sum. Who authorizes its release? If the answer is the contractor, it will be fully spent by completion regardless of whether anything went wrong. Contingency should require owner approval per use, and unused contingency should return to you.

4. The change order procedure

This clause decides the outcome of every dispute on the project.

It needs to say: no change proceeds without a written, signed change order executed before the work starts; each change states scope, price, and schedule impact; overhead and profit markup on changes is capped at a stated percentage; and verbal instructions from anyone — including you, on site, in the moment — create no obligation.

That last part protects you more than it protects the contractor. The most common origin of a disputed bill is an owner saying "sure, go ahead" to a foreman.

Also specify how changes are priced: against the unit rates in the original schedule of values, not at whatever the market will bear once the contractor is the only one on site.

5. Payment, retainage, and lien waivers

Schedule of values. Every progress payment references it. If it's front-loaded — early line items priced high, late ones thin — your money runs ahead of the work, and by the time you notice, the remaining contract balance won't cover the remaining work.

Retainage. A percentage withheld from each payment, released at completion. Whatever the local convention, the clause must state the percentage, the release trigger, and whether it steps down at substantial completion.

Lien waivers. In lien jurisdictions, subcontractors and suppliers can file against your property even after you've paid the general contractor — if the general didn't pay them. The contract must require conditional waivers with each payment application and unconditional waivers on receipt, from the general contractor and from every subcontractor and material supplier above a threshold.

Paying twice for the same work is the classic and entirely avoidable owner loss. Lien rights and deadlines vary sharply by jurisdiction — confirm how yours works before the first payment, not after a filing.

6. Schedule, delay, and liquidated damages

A completion date with no consequence attached is a wish.

Define substantial completion precisely — usually the point where you can occupy and use the work for its intended purpose — because it triggers occupancy, retainage release, warranty start, and the end of delay damages.

Then define which delays are excusable and which aren't. Weather, unforeseen site conditions, and owner-caused delays typically extend time. Subcontractor default and contractor mismanagement typically don't. Write it down; the default assumption otherwise is whatever the contractor argues later.

Liquidated damages set a daily amount for unexcused delay. If the contract has damages running against you for late payment but nothing running against the contractor for late completion, the risk allocation isn't a contract — it's a one-way option.

7. Notice provisions

The quiet clause that decides claims, and it cuts both ways.

Contracts commonly require that a claim for extra cost or additional time be submitted in writing within a short window — often 7 to 21 days from the triggering event — or it's waived. Contractors know these deadlines and diary them. Owners discover them in litigation.

Read the notice clause and note two things: how long you have to raise a claim, and how long the contractor has. Then actually calendar them. A legitimate claim that misses its notice window is worth nothing, regardless of merit.

8. Warranty, correction period, and latent defects

These are three different things, and they get conflated constantly.

The correction period — typically one year — is the contractor's obligation to return and fix defective work. It is not the limit of your rights.

Warranties on materials and equipment run from manufacturers on their own terms, often longer, and the contract should require that all of them be assigned to you at closeout.

Latent defects — failures that couldn't reasonably have been discovered at handover, like waterproofing or structural work — are governed by statute, and the periods are typically far longer than one year. Many contracts contain language attempting to limit liability to the correction period. Whether that's enforceable depends entirely on jurisdiction, but its presence tells you what the contractor is trying to achieve.

What to require at closeout: as-builts, O&M manuals, all assigned warranties, and final unconditional lien waivers — as a condition of final payment, not a request afterward.

9. Termination and dispute resolution

Termination for convenience lets you end the contract without alleging fault, paying for work performed plus defined costs. It's your emergency exit. Check that it exists and that the cost of using it is capped and calculable.

Termination for cause requires a defined default, written notice, and a cure period. Without those steps, terminating a contractor exposes you to a wrongful termination claim.

Dispute resolution determines what enforcement actually costs. Mediation first, then arbitration or litigation — and the venue and governing law clause matters enormously, especially if the contractor is based elsewhere. A binding arbitration clause in a distant venue can make a legitimate $60,000 claim uneconomic to pursue. That is often the point.

Before you sign, verify outside the document

• License — current, correct classification, correct jurisdiction.
• Insurance — certificates for general liability and workers' compensation, sent directly by the insurer, naming you as additional insured.
• Bonding capacity — where performance or payment bonds are warranted by the size of the job.
• The entity — that the party signing is the entity that holds the license and the insurance, and that it has assets.

A perfect contract with an uninsured, unlicensed counterparty is a perfect document and nothing more.

What MEXUM does with it

Upload the contract together with the drawings and the estimate. Fourteen specialist modules review them as one package — whether the estimate matches the drawings, whether the scope in the contract matches the estimate, where the code exposure sits, and which clauses shift risk onto you. You get a written report identifying the specific clause, what it does in practice, and suggested replacement language, within 24 hours.

We work in 40+ countries, to IRC, IBC, EN Eurocodes and local standards, so the review reflects the rules that actually apply where you're building.

Reviews start at $99. Code TRYMEXUM covers your first one through August 31, 2026.

Read the contract once — before signature. Afterwards you're no longer choosing the terms; you're living under them for the length of the warranty.

This article is general information about construction contract mechanics, not legal advice. Contract law, lien rights, notice periods, and defect liability periods vary substantially between jurisdictions. Have your contract reviewed by a construction lawyer licensed where the project is located.