Change orders are a fact of construction. Design documents evolve. Field conditions differ from assumptions. Owners make decisions that add or delete scope. How a GC manages those changes — from the first sign of a potential issue through final approval and billing — determines whether change orders become a profit center or a source of disputes, delayed payments, and margin erosion.
This guide covers the full change order management cycle for GCs: what triggers a change order, how to run the process, what to document, and what best practices separate firms that get paid promptly from those that fight for every dollar. For context on how change orders fit into the broader construction procurement lifecycle, see our procurement guide.
What Triggers a Construction Change Order
A change order is any modification to the contract's original scope, schedule, or price. Common triggers include:
**Owner-directed changes.** The owner decides to add scope (upgraded finishes, additional rooms, expanded systems), delete scope to reduce cost, or modify design elements after construction has begun. These are typically straightforward — the owner wants something different, and the contractor prices the delta.
**Design conflicts and RFI resolutions.** Incomplete or conflicting construction documents — a structural element that conflicts with a mechanical run, a dimension that doesn't work in the field — require resolution through the RFI process. When that resolution changes scope or adds cost, a change order follows.
**Differing site conditions.** Unexpected subsurface conditions (rock, unsuitable soils, buried utilities not shown on plans), concealed conditions in existing buildings (asbestos, structural deficiencies, unexpected framing), or other conditions that differ materially from what was represented in the bid documents entitle the contractor to additional compensation.
**Schedule changes with cost impact.** Owner-caused delays, design delays, or acceleration directives can affect general conditions costs — superintendent time, extended equipment rental, escalation exposure — and may justify a time and cost change order.
**Code and regulatory changes.** If applicable codes change after contract execution, or if interpretations by the authority having jurisdiction differ from what was assumed in the bid, additional compliance costs may be recoverable (Rhumbix, "Change Orders in Construction," 2026).
The Change Order Process: Step by Step
Step 1 — Identify and Issue a Potential Change Order (PCO)
The moment a GC identifies a potential scope change, schedule impact, or cost event outside the original contract, they should issue a Potential Change Order (PCO) — also called a Notice of Change or Change Order Request in some contract forms.
The PCO serves two purposes: it provides formal written notice to the owner and design team that an issue exists, and it creates a documented record before any extra work begins. Most contracts contain notice requirements — provisions that require the contractor to notify the owner within a specific number of days of discovering a potential change. Missing the notice deadline can extinguish the right to compensation, even if the underlying claim is valid.
PCOs should be issued early and often. Issue a PCO any time you think something might be a change — even if you're not certain. A PCO is not a claim; it's a flag. Sorting out whether it's actually compensable comes later.
Step 2 — Prepare a Scope and Price Proposal
Once the PCO is issued, prepare a detailed cost proposal that includes:
- Description of the change (what is different from the original contract scope)
- Detailed breakdown of labor hours by trade and classification
- Material quantities and current pricing
- Subcontractor quotes for any sub-performed work
- Equipment costs if applicable
- Time impact (if the change extends the schedule, price the general conditions extension)
- Overhead and profit markup as allowed by contract
Most contracts specify a deadline for submitting change order pricing — commonly 21 to 30 days from when the work was directed or the change was identified. Know your contract's timeline and calendar it.
For changes involving subcontractor work, get written quotes from subs before submitting the proposal. Submitting a change order based on estimates, then discovering the sub's actual cost is higher, creates a margin problem that's hard to recover.
Step 3 — Review and Negotiate
The owner or their representative reviews the proposal and either approves it, rejects it, or opens negotiations. Common points of contention:
- Labor productivity rates (owner argues the change should take less time than the GC priced)
- Material unit costs (owner challenges market pricing cited by the contractor)
- Overhead and profit markup (owner disputes the applicable percentage)
- Time impact (owner disputes that the change affects the critical path)
Have supporting documentation ready: current supplier quotes, crew timesheets from similar work, productivity data from RSMeans or comparable projects. Change orders that are well-documented are harder to argue against than those based on assertions (Deltek, "The Complete Guide to Managing Change Orders," 2026).
Step 4 — Execute the Change Order
Once pricing is agreed, both parties execute a formal change order document that:
- Amends the contract price (increase or decrease)
- Adjusts the contract schedule if applicable
- Describes the scope change in specific language
- References any PCO, RFI, or directive that originated the change
- Is signed by authorized representatives of both parties
**Critical rule: Do not perform change order work without a fully executed change order or a written directive to proceed.** Performing work first and chasing approval later — sometimes called "working at risk" — frequently results in disputed or denied payment. If the owner directs work verbally or via email and needs you to proceed before a change order is signed, obtain a written direction to proceed and document that the cost will be addressed via change order.
Step 5 — Update Contract Documents and Track
Each executed change order modifies the contract. Update:
- The contract sum (running total of original contract plus all approved COs)
- The schedule of values (add the change order line items to the pay application structure)
- The project schedule if time was granted
- The project cost forecast in your internal job cost system
Maintain a change order log that shows: CO number, description, amount, status, and date approved. This log is essential for month-end billing, lender reporting, and final reconciliation.
Step 6 — Bill the Approved Change Order
Change orders should appear on pay applications as soon as they are executed. Many GCs leave approved change orders off pay applications for months — this is an unnecessary cash flow hit. Execute the CO, add it to the schedule of values, and bill it in the next pay cycle.
Retention on change orders: check your contract. Many contracts hold retention on change orders at the same rate as base contract work. On long projects, this can represent significant cash tied up in changes (Siteline, "The Ultimate Guide to Construction Change Orders," 2026).
Common Change Order Failures — and How to Avoid Them
**Performing work before written approval.** The single most common way GCs lose change order value. Unless there is a written directive to proceed (at minimum), do not start extra work.
**Missing notice deadlines.** Contracts are specific about how many days after identifying a change you must provide written notice. Calendar these deadlines for every project at contract execution.
**Inadequate scope documentation.** A change order that says "Additional work per Owner direction — $18,500" will be challenged. One that includes a detailed labor breakdown, material quotes, and reference to the directing email or RFI number is far more defensible.
**Bundling too many changes.** Submitting one large CO that bundles dozens of small items creates a target for rejection or line-by-line negotiation. Consider whether individual itemization or bundling by work area is more practical for your project context.
**Not pricing the schedule impact.** If a change adds two weeks to the project, the extended general conditions — superintendent, trailer, temporary utilities, insurance — represent real cost. Price it and document the time impact clearly.
**Letting PCOs age.** PCOs that sit unresolved for months become harder to price accurately (crew composition changes, material prices shift) and easier for owners to dispute. Move PCOs to executed change orders promptly (eBacon, "Ultimate Guide to Change Order Management," 2026).
Technology for Change Order Management
Most project management platforms include change order workflow tools. Key capabilities to look for:
- PCO creation with automatic notice deadline tracking
- Subcontractor quote solicitation and comparison within the change order workflow
- Owner approval routing with digital signature
- Automatic update to contract sum and schedule of values
- Integration with accounting/job cost systems to post approved COs
Procore, Autodesk Construction Cloud, and Buildertrend are widely used for change order management. Purpose-built tools like Clearstory focus specifically on change order workflows for GCs who want tighter visibility into pending change order revenue and approval status.
Change Orders Under GMP Contracts
Change order management works somewhat differently under GMP contract delivery. In a GMP structure:
- Changes that fall within the scope of the contractor's contingency do not require a GMP amendment — the contractor absorbs them from contingency
- Changes that are clearly outside the original scope (owner-directed additions, design changes beyond the basis of design) result in a GMP amendment that increases the guaranteed maximum price
- The assumptions and exclusions list in the GMP amendment defines what is inside versus outside the guarantee — this is frequently the source of change order disputes on GMP projects
Understanding the distinction between contingency events and legitimate scope changes is critical to managing GMP projects profitably.
FAQ
**What is a potential change order (PCO) in construction?**
A potential change order (PCO) is a preliminary notice that a cost or schedule event outside the original contract scope has been identified. It documents the issue before extra work begins and preserves the contractor's right to seek compensation. A PCO becomes an executed change order after the scope and price are agreed and both parties sign.
**Can a GC refuse to perform change order work?**
A GC can decline to perform disputed change order work until the scope and price are agreed — except in limited circumstances where the contract contains a "changes clause" that requires the contractor to proceed on direction and resolve price disputes afterward. Read your contract carefully to understand what "proceed under protest" means and how disputes are resolved.
**What is the difference between a change order and a change directive?**
A change order is a signed agreement between owner and contractor on scope and price. A change directive (sometimes called a construction change directive or unilateral change order) is issued by the owner when the parties can't agree on price but the owner wants the work to proceed. The contractor performs the work and the price is determined later — through negotiation, time-and-materials billing, or dispute resolution.
**How do you prevent change order disputes?**
The most effective prevention: detailed scope documentation at contract execution (so the original scope is unambiguous), early PCO issuance (so changes are flagged before cost is incurred), and thorough pricing documentation (so proposals can be defended). Clear exclusions lists in the original bid reduce ambiguity about what was and wasn't priced.
**Should GCs mark up subcontractor change orders?**
Yes. GC overhead and profit markup on subcontractor change order work is standard practice and typically allowed by contract. Common markup rates range from 5–15% on subcontractor change work. Review your contract's change order markup provisions — some owner contracts (particularly public contracts) cap overhead and profit percentages.
Conclusion
Change order management is a discipline, not an afterthought. GCs who have a consistent process — early PCO issuance, thorough pricing, disciplined approval workflows, and prompt billing — turn changes into clean, documented revenue. GCs without process lose value at every stage: missed notices, underdocumented claims, unpaid labor, and disputes that cost more to fight than the change order was worth.
The fundamentals are simple: document early, price thoroughly, get it signed, and bill it promptly. Applied consistently across every project, that discipline makes the difference between change orders that build margin and change orders that drain it.
REFERENCES
1. Rhumbix. "Change Orders in Construction: The Definitive Guide for 2026." rhumbix.com/blog. Accessed May 2026.
2. Deltek. "The Complete Guide to Managing Change Orders in Construction." deltek.com. Accessed May 2026.
3. Siteline. "The Ultimate Guide to Construction Change Orders." siteline.com/blog. Accessed May 2026.
4. eBacon. "The Ultimate Guide to Change Order Management in Construction." ebacon.com. Accessed May 2026.
5. Document Crunch. "Change Order Construction: Definition, Process & Pro Tips." documentcrunch.com/blog. Accessed May 2026.
6. GetOneCrew. "Construction Change Order Management: Process, Pricing, and Best Practices." getonecrew.com. Accessed May 2026.
7. Buildend. "Construction Change Order Process Explained for GCs." buildend.com/blog. Accessed May 2026.