Comparing Construction Contracts and Change Orders
Construction contracts are different from most commercial agreements in a way that matters for comparison: they are living documents. A typical commercial contract is negotiated, signed, and performed largely as written. A construction contract is negotiated, signed, and then continuously modified through change orders, field directives, and supplemental agreements as the project unfolds. The document you compare at the end of a project may bear little resemblance to the one that was signed at the start.
This creates a comparison problem that is unique to construction. You are not just comparing two drafts of the same agreement. You are comparing the original contract against a stack of modifications, each of which may change the scope, price, schedule, or risk allocation. And because change orders are issued under time pressure on active job sites, they often receive less legal scrutiny than the original contract, even though their cumulative effect can be larger.
This post covers the key provisions in construction contracts, how standard forms like AIA and ConsensusDocs differ from negotiated versions, the change order process and its risks, and how to structure a comparison review that captures the full picture.
Standard forms: AIA, ConsensusDocs, and custom contracts
Most construction contracts in the United States start from one of two standard form families: AIA (American Institute of Architects) or ConsensusDocs. The AIA family is the most widely used. The A101 (owner-contractor agreement, stipulated sum), A201 (general conditions), and A401 (subcontract) form the backbone of most commercial construction deals. ConsensusDocs, developed by a coalition of owner, contractor, and subcontractor associations, offers an alternative that is generally viewed as more balanced between parties.
The critical thing about standard forms is that they are almost never used unmodified. The standard form is a starting point. Owners, contractors, and their lawyers add supplementary conditions, modify general conditions, and attach exhibits that change the risk allocation the standard form was designed to balance. The AIA A201, for example, allocates risk between owner and contractor in a way that reflects decades of industry negotiation. When one party modifies those provisions, they are shifting risk away from the standard allocation.
This is where comparison matters. Comparing a negotiated contract against the unmodified standard form reveals exactly how the deal departs from the industry baseline. A contractor reviewing an owner's draft can compare it against the standard AIA A201 to see every modification the owner's lawyer made. An owner reviewing a contractor's markup can do the same. The standard form serves as a known reference point, and the comparison shows the direction and magnitude of every risk shift.
Custom contracts, drafted from scratch without a standard form, require a different comparison approach. Without a standard form baseline, you compare sequential drafts against each other, focusing on the same risk allocation provisions. But you lose the benefit of comparing against an industry-standard starting point, which means you need deeper subject matter knowledge to evaluate whether the provisions are reasonable.
Pricing structures: lump sum, GMP, and cost-plus
The pricing structure determines who bears the risk of cost overruns, and it affects nearly every other provision in the contract. The three main structures are fundamentally different in how they allocate financial risk.
Lump sum (stipulated sum) contracts fix the total price. The contractor agrees to complete the work for a stated amount. If actual costs come in lower, the contractor keeps the savings. If costs run higher, the contractor absorbs the overrun. The owner's risk is limited to the contract price (plus approved change orders). When comparing lump sum contract drafts, focus on what is included in the contract price, how allowances are handled (an allowance is a placeholder amount for work that cannot be priced precisely at signing), and what triggers a price adjustment. A clause that allows the contractor to adjust the price for "unforeseen conditions" or "material price increases exceeding X%" shifts cost risk back to the owner and partially undermines the lump sum structure.
Guaranteed maximum price (GMP) contracts set a ceiling on the owner's cost. The owner pays actual costs of the work plus the contractor's fee, but the total cannot exceed the GMP without an approved change order. Savings below the GMP are typically shared between owner and contractor according to a negotiated split (for example, 75% to the owner, 25% to the contractor). The key provisions to compare between drafts are: the GMP amount itself, the savings split ratio, what costs are included in "cost of the work" versus the contractor's fee, the contingency amount (a budget line within the GMP for unforeseen costs, distinct from a change order), and the circumstances under which the GMP can be adjusted. A contractor who broadens the definition of adjustable GMP events is eroding the "guaranteed" aspect of the maximum price.
Cost-plus contracts put pricing risk almost entirely on the owner. The owner pays actual costs plus a contractor's fee, which can be a fixed amount or a percentage of costs. The key provisions to compare are the definition of reimbursable costs (what counts as a project cost versus the contractor's overhead), the fee structure (fixed fee vs. percentage, and whether the percentage applies to change order work), audit rights (the owner's ability to review the contractor's cost records), and any not-to-exceed amount that converts the cost-plus structure into a de facto GMP.
Scope of work definitions
The scope of work is the foundation of a construction contract. It defines what the contractor is obligated to build. Everything else in the contract, the price, the schedule, the warranties, flows from the scope. When the scope is ambiguous, disputes follow.
In most construction contracts, the scope is defined by reference to the contract documents: drawings, specifications, and any other documents listed in the agreement. The critical comparison point is not just the scope description in the agreement itself, but the list of contract documents that are incorporated by reference. A change that adds or removes a drawing set, a specification section, or an exhibit can materially change what the contractor is obligated to build without touching the scope language in the agreement.
Implied scope provisions are where disputes concentrate. Many construction contracts include language stating that the contractor is responsible for "all work reasonably inferable from the contract documents as necessary to produce the indicated results." This means the contractor may be obligated to perform work that is not explicitly shown on the drawings if it is reasonably necessary to complete the project. The scope of this implied obligation is heavily negotiated. A contractor who narrows it to "work expressly shown on the drawings and specifications" is limiting its risk. An owner who broadens it to include "work customarily performed in projects of similar type and scope" is expanding the contractor's obligations beyond what the documents explicitly show.
Exclusions are as important as inclusions. A scope section that lists specific exclusions ("owner-furnished equipment," "hazardous material abatement," "utility company work") creates clarity about the boundaries of the contractor's responsibility. Watch for changes between drafts that remove or narrow exclusions, effectively expanding the scope without changing the price.
Payment terms and retainage
Construction payment works differently from most commercial agreements. Instead of payment on delivery or periodic fixed amounts, construction contracts use progress payments: the contractor submits monthly applications for payment based on the percentage of work completed, and the owner pays after the architect certifies the amount.
The payment application process involves several steps, each with provisions that change between drafts. The contractor submits a payment application (often called a "pencil draw" in informal practice) to the architect. The architect reviews the application, verifies the percentage of completion, and issues a certificate for payment to the owner. The owner then pays within a specified period (typically 30 days from the certificate, though this is negotiated). Changes to watch for between drafts include: the time between application submission and architect certification, the time between certification and owner payment, the owner's right to withhold payment beyond the retainage, and the grounds for withholding (defective work, lien claims, failure to pay subcontractors).
Retainage is the percentage of each progress payment that the owner withholds as security for the contractor's performance. The standard rate is 5-10%, though some states cap retainage by statute. The key provisions to compare include: the retainage percentage, whether retainage is reduced after the project reaches a certain percentage of completion (for example, reduced from 10% to 5% after 50% completion), the trigger for retainage release (substantial completion vs. final completion), and whether retainage earns interest. For subcontractors, an additional issue is whether the general contractor's retainage terms with the owner flow down to the subcontract. A subcontractor whose retainage is not released until the general contractor's retainage is released may wait months longer than anticipated.
Pay-if-paid vs. pay-when-paid clauses govern how subcontractor payment depends on owner payment to the general contractor. A "pay-when-paid" clause establishes a timing mechanism: the general contractor pays the subcontractor within a reasonable time after receiving payment from the owner. A "pay-if-paid" clause makes the owner's payment a condition precedent to the general contractor's obligation to pay the subcontractor. The difference is significant: under pay-if-paid, if the owner never pays the general contractor, the subcontractor may never get paid. Several states have limited or prohibited pay-if-paid clauses. Watch for changes between drafts that convert pay-when-paid to pay-if-paid.
Change order procedures
Change orders are the mechanism by which construction contracts are modified after execution. They are where the original deal meets job-site reality, and they are one of the most dispute-prone areas in construction law.
Authorization is the threshold question. Who can authorize a change order? Most contracts require the owner's written authorization, but the details vary. Can the architect authorize changes up to a certain dollar amount? Can the owner's representative on site authorize changes verbally, with written confirmation to follow? What happens when a contractor performs changed work based on a verbal directive that is never formalized as a written change order? These questions are answered differently in every contract, and the answers change between drafts. A contractor wants broad authorization rules (verbal directives count, the architect can authorize changes) because job-site realities often require immediate action. An owner wants narrow rules (written authorization from the owner only) to maintain cost control.
Pricing methodology for change orders determines how the cost of changed work is calculated. The common approaches are: negotiated lump sum (the parties agree on a price before the work is performed), unit prices (pre-agreed rates per unit of work, such as cost per cubic yard of concrete), time and materials (actual labor and material costs plus a markup), and force account (detailed cost records submitted after the work is performed). The markup percentages for overhead and profit on change order work are heavily negotiated. A typical range is 10-15% for overhead and 10% for profit on the contractor's own work, with lower markups on subcontractor work. Watch for changes to these percentages between drafts, and for changes to what costs are included in the markup base.
Time extensions are the schedule counterpart to price changes. A change order that adds scope should also extend the contract time if the added work cannot be performed within the existing schedule. The key provisions to compare are: whether time extensions are granted automatically with scope changes or must be separately requested and approved, the notice requirements for requesting a time extension (strict deadlines that, if missed, waive the right to additional time), and whether the contractor must demonstrate that the changed work is on the critical path (affects the project completion date) before a time extension is granted.
Constructive changes are actions by the owner or architect that are not formal change orders but that effectively change the scope of work. An architect who rejects work that conforms to the specifications and requires the contractor to redo it to a higher standard is constructively ordering a change. An owner who denies access to a work area, delaying the contractor's schedule, may have constructively changed the contract time. Whether the contract recognizes constructive changes, and what the contractor must do to preserve its right to claim additional compensation, varies significantly between drafts.
The cumulative effect of change orders
Individual change orders are reviewed and approved one at a time. This is necessary for project management, but it creates a blind spot: no one is tracking the cumulative effect. By the time a project has 20 or 30 change orders, the aggregate changes to price, schedule, and scope may have fundamentally altered the original deal.
Consider a project that starts with a $15 million lump sum contract and a 14-month schedule. Over the course of the project, 25 change orders are approved. Each one was individually reviewed and approved as reasonable. But in aggregate, the contract price has increased to $19 million (a 27% increase), the schedule has extended to 20 months, and the scope has changed enough that the project the contractor is building is materially different from what was originally contracted. The owner's budget assumptions, the contractor's resource planning, and the insurance coverage are all based on the original deal.
The comparison problem is that each change order was compared against the contract as it existed at the time. Change order 15 was compared against the original contract as modified by change orders 1 through 14. But no one compared the current state (original contract plus all 25 change orders) against the original contract to see the full picture. This is the construction-specific version of the amendment comparison problem: each modification is reviewed in context, but the cumulative drift is invisible unless you compare the endpoints.
This cumulative drift affects several specific provisions:
- Liquidated damages may no longer be proportional to the revised contract price. A liquidated damages rate of $5,000 per day set for a $15 million project may be unreasonable (and unenforceable as a penalty) for a $19 million project.
- Insurance limits based on the original contract value may be insufficient for the revised scope. If the contractor's builder's risk policy was sized for $15 million in work and the project is now $19 million, there is a coverage gap.
- Performance bonds typically cover the original contract amount. If cumulative change orders push the total above the bond amount, the owner may be underprotected.
- The contractor's fee under GMP or cost-plus contracts may not account for the increased management burden of a significantly expanded scope.
Comparing the current state of the contract against the original is the only way to see these cumulative effects. This requires treating the original contract and all change orders as a single document set and comparing the resulting obligations against the original.
Indemnification and insurance
Indemnification in construction contracts is more complex than in most commercial agreements because construction projects involve physical risks, multiple parties on a single job site, and statutory limitations on indemnification that vary by state.
Anti-indemnity statutes exist in most states and limit the ability of one party to require another to indemnify it for the first party's own negligence. These statutes vary significantly. Some states prohibit only "broad form" indemnification (requiring the indemnitor to cover the indemnitee's sole negligence). Others also prohibit "intermediate form" indemnification (covering the indemnitee's partial negligence). The practical effect is that an indemnification clause that is enforceable in one state may be void in another. When comparing drafts, check whether changes to the indemnification provision are consistent with the governing law of the contract. A broad form indemnity clause in a contract governed by a state that prohibits it is not just unfair; it is unenforceable.
Insurance requirements in construction contracts are detailed and heavily negotiated. The typical requirements include commercial general liability (CGL), workers' compensation, automobile liability, umbrella/excess liability, professional liability (for design-build contracts), and builder's risk insurance. The key provisions that change between drafts are: coverage limits, additional insured requirements (the owner wants to be named as an additional insured on the contractor's CGL policy), waiver of subrogation (preventing the insurer from suing the other party after paying a claim), and the requirement that insurance be "primary and non-contributory" (the contractor's insurance pays first, regardless of the owner's own coverage).
The interaction between indemnification and insurance is where review gets complicated. An indemnification obligation is only as good as the indemnitor's ability to pay. Insurance is the mechanism that ensures the indemnitor can actually cover claims. When comparing drafts, review indemnification and insurance provisions together. A broad indemnification obligation coupled with inadequate insurance requirements creates a paper protection: the indemnitor is obligated to pay but may lack the financial resources to do so.
Dispute resolution
Construction contracts often have unique dispute resolution mechanisms that differ from the standard arbitration or litigation choice found in most commercial agreements. The multi-party nature of construction projects, the technical complexity of disputes, and the need to resolve issues quickly on active projects drive these differences.
The architect's initial decision is a feature of AIA standard form contracts that has no real parallel in other contract types. Under the AIA A201, the architect is designated as the "Initial Decision Maker" for claims between the owner and contractor. The architect reviews claims, interprets contract requirements, and issues initial decisions that are binding unless appealed within 30 days. This creates a dispute resolution step that occurs before mediation or arbitration, and it is controlled by a party (the architect) who has a pre-existing contractual relationship with the owner. Changes to the architect's authority between drafts are significant. Contractors frequently push to limit the architect's role, shorten appeal periods, or substitute a neutral third party.
Mediation as a prerequisite is standard in both AIA and ConsensusDocs contracts. The parties must attempt mediation before proceeding to arbitration or litigation. Changes to watch for include: whether mediation is mandatory or optional, the time limit for completing mediation, whether either party can proceed to arbitration or litigation if mediation is not concluded within the time limit, and the allocation of mediation costs.
Arbitration vs. litigation is a fundamental choice that changes between drafts. AIA contracts default to arbitration. ConsensusDocs contracts provide a checkbox for the parties to choose. Arbitration is generally faster and more private than litigation, but it limits discovery, may not allow joinder of all parties to a multi-party dispute, and produces decisions that are difficult to appeal. For complex construction disputes involving the owner, general contractor, multiple subcontractors, and design professionals, arbitration's limitations on joinder can result in parallel proceedings with inconsistent results. Watch for changes that switch from arbitration to litigation or vice versa, and for consolidation provisions that allow related disputes to be joined in a single proceeding.
Liquidated damages and substantial completion
Liquidated damages provisions in construction contracts specify a predetermined amount the contractor must pay for each day the project is not complete beyond the contract completion date. They are one of the most negotiated provisions in the contract because they represent a direct financial penalty for delay.
The enforceability of liquidated damages depends on whether the specified amount is a reasonable pre-estimate of the owner's actual damages from delay. If a court determines the amount is punitive rather than compensatory, it may be struck as an unenforceable penalty. Changes to the daily rate between drafts are obviously material, but the more consequential changes are often to the provisions that determine when liquidated damages start and stop accruing.
Substantial completion is the event that typically stops the accrual of liquidated damages. It is defined differently in every contract, and the definition is heavily negotiated because it has cascading effects: it stops liquidated damages, triggers retainage release, starts the warranty period, and shifts risk of loss to the owner. The AIA defines substantial completion as the stage when the work is "sufficiently complete in accordance with the Contract Documents so that the Owner can occupy or utilize the Work for its intended use." Variations between drafts include: whether the architect alone determines substantial completion or whether the owner must also consent; whether a certificate of occupancy is required; whether specific systems must be operational (HVAC, fire safety, elevators); and the treatment of punch list items (minor incomplete or defective items that do not prevent use).
Bonus provisions are the mirror image of liquidated damages: a payment from the owner to the contractor for each day the project is completed ahead of schedule. These appear in some contracts and are removed in others. The presence or absence of a bonus provision, and its symmetry (or asymmetry) with the liquidated damages rate, is worth comparing between drafts.
How to structure a construction contract comparison
Construction contracts are long, technically complex, and composed of multiple documents (agreement, general conditions, supplementary conditions, drawings, specifications, exhibits). A structured comparison approach is essential.
Compare the negotiated contract against the standard form. If the contract is based on an AIA or ConsensusDocs standard form, obtain the unmodified form and compare it against the negotiated version. This shows every risk shift from the industry baseline. Focus on indemnification, insurance, dispute resolution, change order procedures, and payment terms. These are the provisions that parties modify most frequently and where modifications have the greatest impact.
Compare sequential negotiation drafts. When the contract is being negotiated, compare each new draft against the previous version to track what changed in each round. Pay attention to the supplementary conditions, which is where most modifications to the general conditions are implemented. A change that appears in the supplementary conditions may override a provision in the general conditions that you have already reviewed and approved.
Track change orders against the original. For active projects, periodically compare the current state of the contract (original plus all executed change orders) against the original. This reveals cumulative drift in price, schedule, and scope that is invisible when change orders are reviewed individually.
Compare subcontracts against the prime contract. Flow-down provisions in the prime contract require the general contractor to include corresponding obligations in its subcontracts. Compare each subcontract against the prime contract to verify that flow-down obligations are properly passed through. A gap between the prime contract's requirements and the subcontract's obligations creates exposure for the general contractor.
If you need a comparison tool that handles the length and complexity of construction contracts, including multi-document sets, tabular pricing, and the single-word changes to risk allocation provisions that carry the most exposure, try Clausul. Construction contracts are among the most comparison-intensive documents in legal practice, and the stakes of missing a change are measured in project delays, cost overruns, and dispute liability.
Frequently asked questions
What are the main types of construction contracts?
The three most common construction contract types are lump sum (stipulated sum), where the contractor agrees to complete the work for a fixed price; guaranteed maximum price (GMP), where the owner pays actual costs up to a ceiling, with savings typically shared; and cost-plus, where the owner pays actual costs plus a fee (fixed or percentage). Each allocates risk differently. Lump sum puts pricing risk on the contractor. Cost-plus puts it on the owner. GMP splits it. Standard form contracts from AIA (American Institute of Architects) and ConsensusDocs provide templates for each structure, but they are almost always modified during negotiation. Comparing the negotiated version against the standard form shows exactly how the risk allocation was changed.
How do change orders affect the original contract?
Each change order modifies the contract by changing the scope, price, schedule, or some combination of the three. Individually, a change order may seem minor. Cumulatively, a series of change orders can fundamentally alter the original deal. A project that started as a $10 million lump sum contract with a 12-month schedule can become a $14 million project with an 18-month schedule after 30 change orders. The problem is that each change order is typically reviewed in isolation. Without comparing the current state of the contract (original plus all change orders) against the original, no one has a clear picture of how far the project has drifted from what was originally agreed.
What is retainage in a construction contract and why does it matter?
Retainage (also called retention) is a percentage of each progress payment withheld by the owner until the project reaches substantial completion or final completion. The typical retainage rate is 5-10% of each payment. Retainage protects the owner by ensuring the contractor has a financial incentive to finish the project and correct defects. The key provisions to compare between drafts are the retainage percentage, when retainage is released (substantial completion vs. final completion), whether retainage can be reduced after a certain percentage of work is complete, and whether subcontractor retainage terms match the general contractor retainage terms. A change from release at substantial completion to release at final completion can delay payment by months.
What is substantial completion and why is it heavily negotiated?
Substantial completion is the point at which the work is sufficiently complete that the owner can occupy or use the project for its intended purpose, even if minor punch list items remain. It is one of the most consequential definitions in a construction contract because it triggers several important events: the owner takes possession, the warranty period begins, liquidated damages stop accruing, retainage release is triggered, and risk of loss shifts. The exact definition varies by contract and is heavily negotiated. The difference between "the work is substantially complete when the architect certifies it" and "the work is substantially complete when the owner can use the facility for its intended purpose" can mean weeks or months of additional exposure to liquidated damages for the contractor.
How should I compare a modified AIA or ConsensusDocs contract against the standard form?
Start by obtaining the unmodified standard form (AIA A101, A201, ConsensusDocs 200, etc.) that served as the starting template. Compare it against the negotiated version to identify every modification. Focus first on risk allocation provisions: indemnification, insurance, liquidated damages, change order procedures, and dispute resolution. Then check the payment and retainage terms, substantial completion definition, and termination provisions. Standard form contracts are drafted to balance risk between owner and contractor. Most modifications shift risk toward one party. Understanding the direction and magnitude of those shifts is the point of the comparison. A document comparison tool that handles long contracts with embedded tables and cross-references is important here because construction contracts routinely exceed 100 pages with exhibits.
What role does the architect play in construction contract disputes?
Under most AIA standard form contracts, the architect serves as the initial decision maker for disputes between the owner and contractor. The architect reviews claims, interprets contract requirements, and makes initial determinations that are binding unless appealed to mediation or arbitration within a specified period. This is unusual compared to other contract types because a third party who has an existing relationship with the owner (the architect is hired and paid by the owner) is making binding decisions about disputes between the owner and the contractor. Changes to the architect's authority between drafts are significant. A contractor who narrows the architect's decision-making power or shortens the time to appeal is trying to limit the influence of a party it views as aligned with the owner. An owner who broadens the architect's authority is strengthening a dispute resolution mechanism it controls.