Change orders are inevitable in construction. How you manage them determines whether they are profit opportunities or margin killers.
A construction change order is a formal modification to the original contract scope, price, or schedule. Changes happen on every commercial project: owner requested modifications, unforeseen site conditions, design errors, code changes. The average commercial project sees roughly 10 to 15 percent of contract value move through change orders. On a $5M project, that is $500K to $750K of additional scope that needs to be priced, approved, and billed correctly. Get the process right and that work becomes real margin. Get it wrong and you eat the cost or fight for it later.
What a Change Order Is, Exactly
A change order is a signed agreement between the contractor and the owner that changes one or more of three things: scope, price, or time. Until it is signed, the work it covers is not contract work and the money is not earned. This is the part that trips up contractors who start work on a verbal direction and then cannot get paid. On AIA contracts the standard form is the G701, Change Order. Some prime contracts use a different form, but the rule is the same: no signed change order, no obligation.
A change order can add scope, delete scope, increase the contract sum, decrease it, extend the contract time, or any combination. It becomes part of the contract once both parties sign. From that point forward it is treated exactly like original scope on every pay application.
What Triggers a Change Order
Owner directed changes: The owner wants to upgrade the lobby finishes, add a room, change a layout. These are the cleanest. The owner wants something different, you price it, they approve it, and the work proceeds.
Design errors and omissions: Conflicts between architectural and structural drawings, missing details, incomplete specifications. These are the most contentious because responsibility is disputed. The design team may argue the contractor should have caught the conflict during bid. Document your RFIs and your bid clarifications; they are your defense.
Unforeseen conditions: Rock where soil was expected, asbestos in existing walls, buried utilities not shown on surveys. The contract differing site conditions clause governs these. Notify the owner in writing within the time period the contract requires, usually 7 to 14 days, or you risk losing the claim.
Code and regulatory changes: Building code updates after design completion, new ADA requirements, changed fire marshal interpretations. Rare but expensive when they occur, and usually treated as owner directed changes since the owner owns code compliance.
The Change Order Process, Step by Step
Every change follows the same path, whether it is a $500 allowance adjustment or a $500,000 scope addition. Skipping a step is how change orders turn into disputes.
- 1. Identify and document: The moment a change is discussed, start a change order request or a field change notice. Date it, describe the scope, reference the drawing or condition, and note who requested it.
- 2. Notify in writing: Send an RFI or a notice to the architect or owner within the contract time limit. Verbal direction is not protection. If the owner says just proceed, send a confirming email the same day.
- 3. Price the work: Build the estimate with labor, materials, equipment, subcontractor quotes, overhead, and fee. Keep your backup. Owners and architects will ask to see it.
- 4. Submit the proposal: Present the change order proposal with a clear scope description and the price. If time is affected, state the schedule extension in days.
- 5. Negotiate and sign: The owner reviews, may negotiate, and signs the G701 or equivalent. Only after signature does the work become contract scope.
- 6. Bill it: Add the approved CO as a new line item on your G703 and bill it through the next pay app.
Pricing a Change Order Honestly
Pricing is where change orders make or lose money. The honest approach is to price the actual cost of the changed work using the same methods you used for the base bid: real labor rates, real material quotes, real subcontractor pricing, then apply your contract overhead and fee percentage. Keep your backup, including subcontractor quotes and material takeoffs, because owners and architects routinely request it.
Watch for hidden costs that contractors forget: mobilization and demobilization, extended general conditions, scaffolding or equipment already on site that now needs to stay longer, impact on the critical path, and crew inefficiency when work is wedged into an already tight schedule. These are real costs and they are billable, but only if you document and price them. A change order priced only on the obvious material and labor will quietly lose money.
Avoid two extremes. Padding every change order to cover disputes makes you lose the trust that gets change orders approved quickly. Giving work away to keep the owner happy means you finance their changes. Price fairly, document thoroughly, and let the signed CO be the record.
How Change Orders Flow into AIA Billing
On the AIA G702, change orders appear on Line 2, Net Change by Change Orders. This is the cumulative net value of all approved COs to date, additions minus deductions. Line 3, Contract Sum to Date, equals the original contract (Line 1) plus net changes (Line 2). On the G703, each approved CO becomes a new line item on your continuation sheet, billed just like original scope items through the same columns for completed this period and completed to date.
This is why the discipline of logging every CO, every price, and every signature date matters. When the architect audits your pay app, they will tie G702 Line 2 back to the signed G701s in the project file. If the numbers do not match, the whole pay app stops moving. Keep one change order log, keep it current, and make sure your billing team builds from it every month.
Change orders are not a problem to be avoided. They are a normal part of construction that you manage like any other scope. Document everything, price honestly, get the signature, and bill it through the same process you use for base scope. Do that and changes become a reliable margin center instead of a recurring fight.