For quantity surveyors (QS), commercial managers, and subcontractors, signing a subcontract is the moment of greatest leverage. Yet, under pressure to hit project start dates, many teams rush through execution, only to discover margin-killing clauses when variations or payment disputes arise.

A structured subcontract review checklist is your first line of defense. Knowing exactly which clauses to audit, cross-reference, and negotiate protects cash flow, manages liabilities, and establishes clear notice procedures.

In this guide, we provide a practical, QS-focused checklist for construction subcontract review. We also demonstrate how using AI contract tools like LegisDex automates this process to save hours of manual contract analysis.

The QS Subcontract Review Checklist

1. Audit the Scope of Work & Ambiguities

Disputes frequently arise from what is not explicitly written in a subcontract. Ensure that the Subcontract Scope of Work matches the tender negotiations and BOQ (Bill of Quantities) items:

Verify exclusions: Are the agreed exclusions (e.g., hoisting, scaffolding, power supply) listed, or have they been absorbed into the subcontractor's general duties?
Audit catch-all language: Beware of terms like "and all works reasonably inferred to complete the installation." Request clarification or deletion of broad generalizations.
Order of Precedence: Confirm which document governs in the event of a discrepancy (e.g., Subcontract Agreement, Special Conditions, Drawings, BOQ).

💡 How LegisDex helps: Upload the draft subcontract to LegisDex Contract Q&A and ask: "What is the order of precedence in this subcontract?" or "Are there any catch-all clauses regarding scope responsibility?" to isolate hidden obligations immediately.

2. Review Payment Terms & Cash Flow Mechanisms

A subcontractor's survival depends on cash flow. Check that payment timelines are fair and comply with statutory acts:

Payment cycles: What is the valuation date, payment notice date, and final date for payment? Avoid cycles exceeding 30 to 45 days if possible.
Pay-when-paid clauses: Ensure there are no conditional payment mechanisms that link your payment to the Client paying the Main Contractor.
Retention: Check the retention percentage (usually 5% or 10%) and verify that half is released at Practical Completion of the subcontract works, and the remainder at the end of the Defects Liability Period.

3. Flag notice periods & time-bars

Time-bars are the most dangerous clauses in modern construction subcontracts. Main contractors frequently impose extremely short notice windows to pass down their own risks:

Variation notices: How many days do you have to notify the contractor of a variation instruction before losing entitlement? (Often 5 to 7 days).
Extension of Time (EOT) notices: What is the notice window for delay events? Are there strict formatting guidelines or required particulars?

💡 How LegisDex helps: Create custom Compliance Playbooks to run automated checks on subcontracts. LegisDex screens the draft and highlights all notice windows, time-bars, and documentation requirements, ensuring your site team is aware of their operational deadlines before signing.

4. Verify Variation & Valuation Rules

Valuation rules dictate how variations will be priced. Ensure the subcontract outlines a fair process for changes:

Instruction requirements: Variations must be instructed in writing by an authorized representative. Verbal instructions must be confirmed in writing within a specified notice window.
Pricing hierarchy: Rates should follow a hierarchy—first using Subcontract BOQ rates, then pro-rata rates for similar work, and finally daywork rates or cost-plus mechanisms.

5. Check Liability Caps, Indemnities & Insurances

Uncapped liabilities can bankrupt a subcontractor. Always audit the legal risk profile:

Limitation of Liability: Ensure there is a cap on overall liability (ideally 100% of the subcontract value).
Consequential losses: Exclude liability for indirect, special, or consequential losses, including loss of profit, revenue, or production.
Indemnities: Ensure indemnities are reciprocal and limited to the extent that the subcontractor's negligence caused the loss.

6. Audit Dispute Resolution & Termination Clauses

Ensure there is a clear, stepped dispute resolution clause that does not lock you into expensive litigation or arbitration immediately:

Alternative Dispute Resolution (ADR): Look for mediation, adjudication, or expert determination steps before formal arbitration.
Termination for convenience: If the contractor terminates the contract for convenience, they must compensate the subcontractor for completed work, demobilization costs, and loss of profit on uncompleted works.

💡 How LegisDex helps: Push flagged subcontract concerns directly into Tracker Projects on LegisDex. You can assign contractual issues (e.g., negotiating the removal of a pay-when-paid clause) to specific team members, track progress, and log negotiations in a single, centralized portal.

Summary: Key Clauses to Audit in Subcontracts

Scope & Precedence: Clear scope descriptions, defined precedence order, explicitly listed exclusions.
Payment Terms: No pay-when-paid clauses, clear payment cycle dates, defined retention release terms.
Notice Time-Bars: Understand and negotiate short notice windows (e.g., EOT, Variations).
Liability Caps: Limit overall liability to contract value, exclude consequential loss.
Dispute Stepped Process: Mediation or adjudication before arbitration.

Protect Your Project Margins with LegisDex

Subcontract review is a critical commercial checkpoint. By establishing a robust subcontract review checklist, quantity surveyors and managers can catch unfavorable clauses and negotiate balanced terms.

With LegisDex, you can accelerate this audit workflow. Upload contracts, run automated compliance reviews, generate reports, and track open issues to ensure your agreements protect your business.

👉 Sign up for a free trial of LegisDex and modernize your construction subcontract review process today.

How to Review a Subcontract Before You Sign: A Practical QS Checklist