Subcontractor Agreement Review: What to Check Before You Sign
The prime contract gets the attention. It is the larger document, the higher value, and the one with the client relationship attached. But for the party managing a subcontract package, the subcontractor agreement is where the concentrated commercial risk actually sits, and it gets a fraction of the review time.
The reason is structural. A general contractor signs one prime contract and issues thirty subcontracts. The prime is reviewed carefully by the commercial team and often by counsel. The subcontracts are issued from a house template under schedule pressure, with the assumption that the template handles it. Every gap between what the prime requires and what the subcontract passes down is absorbed by the contractor in the middle, and those gaps are created at execution and discovered during a dispute eighteen months later.
For subcontractors, the exposure runs the other way. The agreement in front of you was drafted by the contractor, incorporates a prime contract you may not have seen in full, and frequently transfers risk that has nothing to do with your scope. Signing it without reading what has been incorporated is how subcontractors end up carrying obligations they never priced.
This guide covers what to check on both sides of that agreement.
What to Check First: Scope and Flow-Down
Scope definition. Start with what the subcontractor is actually obliged to deliver. The scope should be defined by reference to specific drawings, specification sections, and revision numbers rather than a general description. Where the subcontract says the subcontractor performs "all work shown on the drawings and reasonably inferable therefrom," the word reasonably is doing significant work and the parties will disagree about it. Check for scope gap language that assigns responsibility for work falling between trade packages, because unassigned scope is either a change order or an argument.
Incorporation by reference. Nearly every subcontract incorporates the prime contract by reference. Two questions follow. First, has the subcontractor actually been provided with the prime contract, including the Supplementary Conditions and any Owner modifications? A subcontractor bound by a document they have not read is bound nonetheless in most jurisdictions. Second, what is the scope of incorporation? A clause stating the subcontractor assumes toward the contractor all obligations the contractor assumes toward the owner is broad, and courts in many states have declined to enforce specific prime provisions against subcontractors where the subcontract did not address them expressly.
Order of precedence. Where the subcontract and the incorporated prime contract conflict, which governs? A clear precedence clause resolves the question. Its absence generates disputes about which document controls on payment timing, notice periods, and dispute resolution, which are precisely the provisions where the two documents most often diverge.
Specific flow-down of key provisions. General incorporation is not sufficient for the provisions that matter. Notice and claim deadlines, delay damages, insurance and indemnity requirements, change order procedures, dispute resolution, and lien waiver obligations should each be addressed expressly in the subcontract rather than left to a general incorporation clause. For the contractor's side of this analysis across a full package, see the guide to general contractor contract review.
Payment Terms and Pay-if-Paid Risk
The distinction that matters. Pay-when-paid is generally construed as a timing provision: the contractor has a reasonable period to pay after receiving owner payment, but the obligation to pay is not itself contingent. Pay-if-paid is a condition precedent: the subcontractor is paid only if the contractor is paid, which transfers owner insolvency risk down the chain. The drafting determines which one you have, and the difference is the entire credit risk of the project.
Enforceability varies substantially by state. Some jurisdictions enforce clearly drafted pay-if-paid clauses as genuine conditions precedent. Others, including California and New York, treat them as unenforceable or construe them as timing provisions regardless of the drafting. Several states require explicit condition precedent language before the clause will be given that effect. The practical consequence cuts both ways: a contractor relying on pay-if-paid protection in a state that does not enforce it is carrying credit risk it believed it had transferred, and a subcontractor conceding the clause in a state that does not enforce it has conceded less than it appears.
Prompt payment statutes overlay the contract. Most states have prompt payment acts imposing statutory payment deadlines and interest on late payment, and many apply to private work as well as public. These statutes can override contractual payment terms and in some states expressly limit pay-if-paid enforceability. The applicable state act needs checking alongside the agreement.
Payment timing alignment. Check the subcontract payment period against the prime. If the owner pays the contractor within 30 days of certification and the subcontract requires payment within 30 days of the subcontractor's application, the contractor is funding the gap between the two cycles. The subcontract period should be structured to follow receipt of the corresponding prime payment, not to run in parallel with it.
Retainage. Confirm the subcontract retainage percentage against the prime. A contractor holding 5 percent from subcontractors while the owner holds 10 percent from the contractor is financing the difference across every trade for the project duration. Check the release conditions too: subcontract retainage should not release earlier than the corresponding prime retainage, and release should not be conditioned on events outside the subcontractor's control unless the same condition applies upstream.
Conditions to payment. Many subcontracts condition payment on submission of lien waivers, updated schedules, certified payrolls, or as-built markups. These are legitimate requirements but they need to be achievable and clearly defined, because an undefined documentation condition is a route to withheld payment.
Insurance and Indemnity Alignment
Coverage types and limits. The subcontract should require the coverage types and limits necessary to satisfy the prime contract, calibrated to the trade's actual exposure. A demolition, steel erection, or roofing subcontractor carries materially different risk from a finishes trade, and uniform limits across all trades either over-insure the low-risk packages or under-insure the high-risk ones. Check that the required limits are commercially available for the trade in question, because a requirement that cannot be met in the market is a breach the moment the agreement is signed.
Additional insured status. Confirm who must be named as additional insured, on what basis, and whether the required endorsement forms are specified. Ongoing operations and completed operations coverage are different, and a requirement that names the owner and contractor as additional insured for ongoing operations only leaves a gap for claims arising after completion.
Waiver of subrogation. Both prime and subcontract typically require waiver of subrogation in favour of the other parties. Confirm the waiver is mirrored, because an asymmetric waiver leaves one party's insurer with recovery rights the other has given up.
Primary and non-contributory. Where the subcontract requires the subcontractor's coverage to respond on a primary and non-contributory basis, confirm the policy actually supports that requirement by endorsement. This is a common gap between what the contract requires and what the certificate of insurance evidences.
Indemnity scope and state law. Indemnity provisions in subcontracts are frequently drafted broadly, requiring the subcontractor to indemnify the contractor and owner for claims arising from the work regardless of who was at fault. Many states have anti-indemnity statutes that prohibit or limit indemnification for the indemnitee's own negligence. Some void broad-form indemnity entirely, others permit intermediate-form but not broad-form. An indemnity provision that exceeds what state law permits may be unenforceable in whole or in part, which provides false comfort to the party relying on it and may invalidate related insurance arrangements.
Insurance and indemnity read together. The commercial question is whether the indemnity obligation the subcontractor has accepted is actually covered by the insurance the subcontract requires. Where the indemnity extends beyond the scope of the subcontractor's liability policy, the subcontractor carries uninsured exposure and the contractor's protection is only as good as the subcontractor's balance sheet.
Notice Periods That Actually Protect You
Notice provisions are where subcontract review most often fails, and the failure is usually the same one: the subcontract notice period is equal to the prime contract period rather than shorter than it.
The arithmetic. If the prime requires the contractor to give the owner notice of a claim within 21 days of the event, and the subcontract requires the subcontractor to give the contractor notice within 21 days, the contractor has zero working days to receive the subcontractor's notice, evaluate the claim, assemble supporting documentation, and serve its own upstream notice within the prime deadline. The claim arrives on the last day and is already out of time upstream. A practical margin is a subcontract period of roughly half the prime period, which gives the contractor time to assess and submit.
Condition precedent or procedural requirement. Confirm whether each notice obligation operates as a condition precedent, where failure extinguishes entitlement entirely, or as a procedural requirement, where failure may affect the claim without barring it. This distinction is not always apparent from the wording, and it determines how much discipline the provision demands.
Form and delivery requirements. Check for requirements about who notice must be addressed to, in what form, and by what delivery method. Requirements for written notice to a named individual by certified mail create additional ways to fail the provision even when notice was given within the time limit. Email notice provisions should be checked against how the project actually communicates.
Notice triggers. Confirm when the clock starts: from the occurrence of the event, from awareness of the event, or from awareness of the impact. These are different triggers and they can differ by weeks on a claim where the impact emerges later than the cause.
Practical discipline. Contemporaneous notice costs nothing and preserves entitlement. The discipline of notifying promptly on every potential claim event, rather than assessing merit first and notifying second, is the single most effective commercial habit on any subcontract package. Entitlement that has been preserved can be abandoned later. Entitlement that has been lost to a missed deadline cannot be recovered.
How AI Reviews Subcontractor Agreements
The specific value of AI on subcontract review is cross-document analysis: reading the prime contract and the subcontract together and identifying every point where they fail to align.
The analysis identifies notice periods that leave insufficient time for upstream compliance, insurance requirements that are not passed down at the limits the prime requires, indemnity provisions that do not mirror the upstream obligation, delay damages exposure with no downstream recovery route, payment timing that leaves the contractor funding the gap between cycles, retainage mismatches, and dispute resolution provisions that create inconsistent forums for the same facts.
For a contractor issuing thirty subcontracts against a single prime, this comparison is the task that manual review cannot do reliably at speed. It requires holding two documents in parallel and checking every material provision against its counterpart, repeated across the full package. AI does it consistently and produces a structured list of gaps.
For a subcontractor receiving an agreement, the same analysis works in reverse: what has been incorporated by reference, what obligations have been transferred, and where the agreement imposes requirements that exceed the subcontractor's scope or insurance programme.
AI also consolidates every notice deadline and obligation across the package into a single calendar. On a project with a prime contract and thirty subcontracts, the number of live deadlines at any point runs into the hundreds, and spreadsheet tracking fails at scale.
The state law layer remains a legal question. AI flags provisions that interact with state statutes, including indemnity against anti-indemnity acts, pay-if-paid enforceability, and lien waiver requirements, but confirming the position in a specific jurisdiction requires counsel licensed in that state. For a comparison of the tools available for this work, see the guide to construction contract review software.
Frequently Asked Questions
What should a subcontractor check before signing an agreement?
The highest-priority items are: what has been incorporated by reference and whether you have actually been provided with the prime contract; whether the payment provision is pay-when-paid or pay-if-paid and how that clause is treated in the project state; the scope definition and whether it clearly excludes work belonging to other trades; the indemnity obligation and whether your liability policy actually covers it; the insurance limits and endorsements required and whether your programme satisfies them; and the notice periods for claims, including whether they operate as conditions precedent. Each of these should be resolved before signature, because none of them is negotiable afterwards.
What is flow-down in a subcontract?
Flow-down is the mechanism by which obligations in the prime contract are imposed on the subcontractor through the subcontract. It typically operates through a general incorporation clause stating that the subcontractor assumes toward the contractor all obligations the contractor assumes toward the owner. However, general incorporation is often insufficient: courts in many states have declined to enforce specific prime provisions against subcontractors where the subcontract did not address them expressly. Notice deadlines, delay damages, insurance and indemnity, change procedures, dispute resolution, and lien waiver obligations should each be addressed specifically.
Is a pay-if-paid clause enforceable?
It depends on the state. Some jurisdictions enforce clearly drafted pay-if-paid clauses as genuine conditions precedent, transferring owner insolvency risk to the subcontractor. Others, including California and New York, treat them as unenforceable against public policy or construe them as pay-when-paid timing provisions regardless of the drafting. Several states require explicit condition precedent language before giving the clause that effect. Prompt payment statutes in many states also limit their operation. Because the position varies materially by jurisdiction, the enforceability question should be confirmed with counsel licensed in the project state rather than assumed from the contract language.
How should subcontract notice periods compare to the prime contract?
Subcontract notice periods must be shorter than the corresponding prime periods, not equal to them. If the prime requires notice within 21 days of an event and the subcontract requires the same 21 days, the contractor receives the subcontractor's notice on the day the upstream deadline expires, leaving no time to evaluate the claim, assemble documentation, and serve its own notice. A practical margin is roughly half the prime period. Misaligned notice periods are among the most common flow-down failures, and the consequence is the contractor absorbing a claim it could otherwise have passed upstream.
Can AI review subcontract packages against the prime contract?
Yes, and cross-document comparison is where AI adds the most value on subcontract review. A construction-specific platform reads the prime contract and the subcontract together and identifies misalignments: notice periods that leave no time for upstream compliance, insurance requirements not passed down at required limits, indemnity provisions that do not mirror the upstream obligation, payment timing gaps, retainage mismatches, and inconsistent dispute forums. It also consolidates notice deadlines across the full package into a single calendar. Confirming state law questions such as indemnity enforceability and pay-if-paid effect remains work for counsel in the project jurisdiction.
Lexilio is the construction commercial intelligence platform for FIDIC, NEC, JCT, and AIA contracts.
