What Are Construction Claims? Types, Notice, and Proof

A construction claim is a formal demand by one party on a construction project — contractor, owner, subcontractor, or supplier — for additional money, additional time, or both from another party to the project. Claims arise when something disrupts the plan the contract set out: a design change adds rework, hidden conditions blow up the excavation budget, an owner withholds payment, or a delay pushes the completion date. Most construction contracts spell out how and when claims must be filed, and missing those procedures is one of the fastest ways to lose a claim that would otherwise have been paid.

What Triggers a Construction Claim

Claims rarely come out of nowhere. They grow from a gap between what the contract promised and what actually happened on the jobsite. A few patterns show up again and again.

Scope changes are probably the single biggest source of friction. The owner or architect revises drawings mid-project, adds features, or redefines specifications, and the contractor’s costs jump. If the parties can’t agree on the price or time impact of the change, a claim follows. On federal projects, the contracting officer can order changes to specifications, construction methods, or the pace of work at any time, and the contractor is entitled to an equitable adjustment if those changes increase costs or extend the schedule.¹

Differing site conditions are another frequent trigger. A contractor bids based on soil reports and geotechnical data in the contract documents, then hits something completely different underground: bedrock where borings showed clay, or a buried utility nobody disclosed. Federal regulations recognize two kinds: conditions that differ from what the contract indicated, and unusual conditions that differ from what anyone would reasonably expect for that type of work.² Federal-aid highway projects are required to include a differing site conditions clause unless state law prohibits it.³

Delays caused by one party’s actions or inaction account for a large share of claims. An owner who can’t deliver a cleared site on time, a designer who takes months to respond to submittals, or a general contractor who fails to coordinate trades can all push the completion date and drive up costs. Payment disputes round out the list: work gets performed, invoices go out, and money doesn’t arrive.

Common Types of Construction Claims

Not all claims look the same. The category matters because it shapes what the claimant has to prove and what relief is available.

Delay Claims

Delay claims are the most common type in the industry. A contractor files one when events outside its control push the project past the contractual completion date, driving up costs for extended general conditions, idle equipment, and supervision. The key question is always whose fault caused the delay. Owner-caused delays (late permits, design revisions, access problems) generally entitle the contractor to both a time extension and money. Delays from weather or other force-majeure events typically get a time extension only, no extra compensation. Contractor-caused delays get nothing and may trigger liquidated damages running the other direction.

Disruption Claims

Disruption is different from delay, and the distinction trips people up constantly. A project can finish on time but still cost far more than it should because the work was performed inefficiently. Disruption claims target that lost productivity: stacking trades in cramped spaces, constant stop-and-start work sequences, excessive change orders that break the planned workflow. Proving disruption is harder than proving delay because the contractor has to isolate productivity losses from the normal chaos of a construction site and show that a specific owner action or omission caused the inefficiency.

Change Order Claims

When the owner or designer directs work that differs from the original contract scope, the contractor is entitled to a price or time adjustment. If the parties negotiate and agree on terms, the result is a change order, no claim necessary. The claim arises when they can’t agree. On federal contracts, even an informal instruction from the contracting officer that causes extra work is treated as a change, as long as the contractor gives written notice. The contractor must assert its right to an adjustment within 30 days of receiving the change order or providing written notice of the constructive change.¹

Differing Site Conditions Claims

These claims hinge on a mismatch between what the contract documents described and what actually exists underground or at the site. The contractor must give written notice before disturbing the conditions so the owner can inspect them.² This notice requirement catches contractors off guard. If crews dig through the problem area before documenting it, the claim weakens dramatically because the owner never got to see the original conditions.

Constructive Acceleration Claims

Constructive acceleration is one of the more counterintuitive claim types. It happens when a contractor encounters a legitimate, excusable delay, requests a time extension, and the owner either denies the request or ignores it. With the contractual deadline unchanged, the contractor is forced to accelerate by adding overtime, extra crews, or shift work to finish on time. The contractor then claims the cost of that acceleration effort. Four elements are generally required: the contractor must have been entitled to a time extension, must have requested it, must have been denied or ignored, and must have actually incurred extra costs trying to meet the original deadline. Even if the owner eventually grants the extension after the acceleration money has already been spent, the claim still stands.

Payment Claims

Payment claims cover non-payment, late payment, and underpayment for work already performed. On private projects, contractors and subcontractors can protect themselves through mechanics liens, a statutory right to place a security interest on the property they improved. Liens are governed entirely by state law, and deadlines for filing range from roughly 60 days to one year after the last work was performed, depending on the jurisdiction. Missing the deadline forfeits the lien right entirely. Liens are not available on public projects because a private lien cannot attach to government-owned property.

For federal projects, the Miller Act fills that gap. Subcontractors and suppliers who haven’t been paid within 90 days after completing their work can bring a civil action on the general contractor’s payment bond. A subcontractor’s supplier — someone with no direct contract with the general contractor — must also give written notice to the general contractor within 90 days of its last delivery or work.⁴

Liquidated Damages

Liquidated damages clauses are technically an owner’s claim tool rather than the contractor’s, but every contractor needs to understand them. These clauses set a pre-agreed daily rate the contractor owes for each day a project finishes late. Courts enforce liquidated damages when the amount was a reasonable estimate of the owner’s anticipated losses at the time the contract was signed. If the amount is wildly disproportionate to any plausible loss, say $50,000 per day on a $200,000 project, a court will likely strike it down as an unenforceable penalty. The test is reasonableness at the time of contracting, not whether actual damages turned out to be higher or lower.

What a Valid Claim Has to Show

Filing a claim isn’t just about being right. Plenty of legitimate claims fail because the claimant couldn’t check all four boxes that make a claim actionable.

Timely Notice

Almost every construction contract requires the claimant to notify the other party within a specific window after the triggering event. Standard industry contracts like the AIA A201 typically require written notice within 21 days. Federal procurement contracts require written claims within six years of accrual, though the contracting officer must be notified much sooner for differing site conditions and changes.⁵ Late notice can destroy a claim entirely, not just weaken it. Many contracts make timely notice a condition precedent, meaning no notice equals no claim, regardless of the merits.

Entitlement

Entitlement is the legal or contractual basis for the claim. The claimant has to point to a specific provision — a changes clause, a differing site conditions clause, a delay provision — and show that the facts satisfy its requirements. A contractor who encounters an excusable delay has entitlement to a time extension under most contracts. A contractor who caused its own delay does not. This is where the contract language matters most, and where ambiguity spawns the biggest fights.

Causation

The claimant must draw a clear line between the other party’s action or failure to act and the resulting harm. This sounds straightforward, but on a complex project with dozens of overlapping activities, proving that a specific owner decision caused a specific two-week delay, rather than the contractor’s own sequencing choices or a subcontractor’s slow performance, requires detailed schedule analysis. Causation is where most contested claims are actually won or lost.

Quantification

The claimant has to put a number on the damages. Vague assertions that a change cost a lot of money go nowhere. On federal contracts, claims over $100,000 must be certified in writing, with the contractor attesting that the claim is made in good faith and the supporting data are accurate and complete.⁶ That certification requirement creates real consequences for inflated claims; it is not just a formality.

Documentation Behind a Claim

The difference between a claim that gets paid and one that gets denied almost always comes down to records. By the time a claim is formally submitted, sometimes months or years after the events in question, memories have faded and the other side has its own version of what happened. Contemporaneous documentation is the only reliable counter.

Daily logs are the backbone. Every superintendent’s report should note weather conditions, crew sizes, equipment on site, work performed, instructions received from the owner or architect, and any disruptions or delays. Photographs and videos, time-stamped and organized by location, are hard to argue with. Correspondence matters enormously: emails, letters, meeting minutes, and requests for information create a chronological record of who said what and when.

For cost claims, the records need to tie specific costs to specific events. Labor timesheets broken down by activity, equipment rental invoices, material receipts, and subcontractor change requests all build the quantification story. Schedule updates, with baseline schedules compared against monthly progress schedules, are essential for delay and disruption analysis. One often-overlooked category is pre-contract documents. The original bid estimate, the assumptions behind labor productivity rates, and the geotechnical reports provided during bidding establish the baseline against which the claim measures its damages. If the bid assumed 500 labor hours for an activity and the actual was 900 due to owner-caused disruption, the bid documents are what proves the 500-hour baseline.

Deadlines That Control the Claim

Every claim has a deadline, and the consequences of missing it are typically absolute. Construction contracts set their own notice windows, which can be as short as 7 to 21 days after the triggering event. These contractual deadlines are separate from, and usually much shorter than, any statute of limitation.

On federal contracts, the Contract Disputes Act sets a six-year outer limit from the date a claim accrues.⁶ But waiting anywhere close to six years is a terrible strategy. Evidence degrades, witnesses leave, and the contracting officer’s patience for stale claims is minimal. For mechanics liens, state deadlines are far shorter, generally ranging from 60 days to one year after the last work was performed. Payment bond claims on federal projects must be brought within one year of the last day the claimant performed work or supplied materials.⁴

The practical takeaway: treat the contractual notice deadline as the real deadline. A claim filed within the statute of limitations but outside the contract’s notice window will almost certainly be rejected. And on federal change order claims, no equitable adjustment will be made for costs incurred more than 20 days before the contractor gave written notice of the change.¹ That 20-day lookback means every day without notice is a day of unrecoverable costs.

How Claims Get Resolved

Filing the claim is step one. Getting it resolved is a separate process, and most construction contracts lay out a required sequence.

The first step is almost always direct negotiation between the parties. On many projects, the contract designates an initial decision maker, often the architect, who reviews the claim, interprets the contract, and issues an initial decision. On federal projects, that role belongs to the contracting officer, who must issue a written decision on claims of $100,000 or less within 60 days of the contractor’s written request. For certified claims over $100,000, the contracting officer has 60 days to either decide the claim or notify the contractor when a decision will come.⁵

If direct negotiation fails, most modern construction contracts require mediation before allowing arbitration or litigation. Mediation brings in a neutral third party who facilitates settlement discussions but has no power to impose a decision. On large or complex projects, some contracts establish a dispute resolution board, a panel of neutral professionals who stay involved from start to finish and know the project when a dispute surfaces.

When earlier steps fail, the contract dictates whether the dispute goes to arbitration or court. Arbitration uses a private arbitrator or panel, often governed by the American Arbitration Association’s construction rules, and produces a binding decision. The Federal Arbitration Act makes written arbitration agreements in commercial contracts valid and enforceable.⁷ Litigation goes through the court system with full procedural formality: discovery, depositions, trial, and potential appeal. On federal contracts, the contractor can appeal a contracting officer’s decision to either the agency’s board of contract appeals or the U.S. Court of Federal Claims.⁶

1
Acquisition.GOV. 48 CFR 52.243-4 – Changes
2
Acquisition.GOV. 48 CFR 52.236-2 – Differing Site Conditions
3
Federal Highway Administration. Differing Site Conditions (23 CFR 635.109)
4
Office of the Law Revision Counsel. 40 USC 3133 – Rights of Persons Furnishing Labor or Material
5
Acquisition.GOV. 48 CFR 52.233-1 – Disputes
6
Office of the Law Revision Counsel. 41 USC 7103 – Decision by Contracting Officer
7
Office of the Law Revision Counsel. 9 USC 2 – Validity, Irrevocability, and Enforcement of Agreements to Arbitrate