The contract type you choose determines how risk, cost, and control are distributed between owner and contractor. Choosing wrong can erode margins or kill a project.
Each contract type distributes risk differently. Understanding the trade-offs is essential for choosing the right structure for your project.
The contractor agrees to complete all work for a single, predetermined price. The most common contract type in commercial construction, accounting for roughly 45% of all projects.
The owner pays the contractor for actual costs incurred plus an agreed fee (percentage or fixed). Provides flexibility but requires rigorous cost tracking and open-book accounting.
A hybrid of cost-plus and lump sum. The contractor is reimbursed for actual costs plus a fee, but the total cannot exceed a guaranteed ceiling. Savings below the GMP are typically shared between parties.
The owner pays for actual labor hours at agreed rates plus material costs (often with a markup). Commonly used for small projects or when scope is impossible to define upfront.
The contractor bids a price per unit of work (e.g., per cubic yard of concrete, per linear foot of pipe). Final cost is determined by multiplying unit prices by actual quantities installed. Common in heavy civil and infrastructure.
These seven clauses carry the most financial risk. Every contractor should review these carefully before signing any construction contract.
Defines who pays when things go wrong. Broad-form indemnification shifts all liability to the contractor, even for the owner's negligence. Many states now prohibit this.
Negotiate for: Intermediate-form indemnification that limits your liability to your own negligence.
Pre-set daily or weekly penalties for late completion. Typically ranges from $500 to $50,000 per day depending on project size. Must be a reasonable estimate of actual damages to be enforceable.
Negotiate for: Caps on total LDs, mutual LDs (bonus for early completion), and clear force majeure carve-outs.
Defines how scope changes are documented, priced, and approved. Poorly written change order clauses lead to more disputes than any other contract provision.
Negotiate for: Clear pricing methods (unit rates, T&M caps), reasonable notice periods, and the right to proceed under protest.
Specifies how disagreements are resolved: negotiation, mediation, arbitration, or litigation. Multi-tiered resolution (negotiate → mediate → arbitrate) is considered best practice.
Negotiate for: Binding arbitration over litigation (faster, cheaper), and continuation of work during dispute resolution.
Two types: termination for cause (breach/default) and termination for convenience (owner can cancel without reason). The convenience clause is particularly dangerous for contractors.
Negotiate for: Fair compensation upon convenience termination including lost profits on remaining work, and clear cure periods for cause termination.
"Pay-when-paid" means the GC pays the sub after receiving payment from the owner (timing provision). "Pay-if-paid" means the GC only pays the sub if the owner pays (condition precedent). The distinction is critical.
Negotiate for: Pay-when-paid (not pay-if-paid), reasonable payment windows (30 days max), and lien rights preservation.
A percentage (typically 5–10%) withheld from each progress payment until project completion. Retainage ties up contractor cash flow and has been increasingly regulated by state legislatures.
Negotiate for: Retainage reduction at 50% completion, release upon substantial completion, and retainage held in escrow with interest.
Understanding where risk falls is the key to choosing the right contract structure and pricing it correctly.
| Risk Factor | Lump Sum | Cost Plus | GMP | T&M | Unit Price |
|---|---|---|---|---|---|
| Cost Overrun | Contractor | Owner | Shared (capped) | Owner | Shared |
| Scope Changes | Change orders | Owner absorbs | May adjust GMP | Owner absorbs | Qty adjustments |
| Material Price Volatility | Contractor | Owner | Contractor (within GMP) | Owner | Contractor |
| Design Errors | Change orders | Owner | May adjust GMP | Owner | Change orders |
| Schedule Delays | Contractor (LDs) | Shared | Shared | Owner | Contractor (LDs) |
| Administrative Burden | Low | High | High | Medium | Medium |
| Budget Certainty | High | Low | Medium-High | Low | Medium |
These strategies can save hundreds of thousands of dollars over the life of a project.
Owner-drafted contracts are written to protect the owner. Every clause is negotiable. Red-line aggressively on indemnification, liquidated damages, and termination provisions. According to the AGC, contractors who negotiate contracts reduce claim exposure by an average of 35%.
Do not accept a lump-sum contract when the design is only 60% complete. Push for GMP or cost-plus until documents are finalized. The wrong contract type on an incomplete scope is the leading cause of construction disputes.
Vague completion definitions trigger liquidated damages disputes. Specify exactly what constitutes substantial completion, who determines it, and what punch list items are excluded. Include objective criteria, not subjective judgment.
For any project exceeding 12 months, include material and labor escalation provisions tied to published indexes (BLS PPI, CRU). Without escalation protection, a 2–3% monthly price increase on steel can destroy margins on a 24-month project.
Ensure the contract preserves your mechanic's lien rights. Refuse pay-if-paid clauses where legally permissible. Negotiate prompt payment terms (net 30 or less) and ensure retainage is released at substantial completion, not final completion.
Manual contract review misses subtle risk-shifting language. AI-powered contract analysis can identify unfavorable clauses, benchmark terms against industry standards, and flag deviations from AIA or ConsensusDocs templates in minutes.
