Change orders are a fact of construction life. Projects change. Owners request additions. Hidden problems surface once walls come open or excavation begins.
The problem isn’t that changes happen — it’s that contractors routinely perform the extra work, forget (or fail) to document it properly, and then can’t collect for it. Scope creep is rarely one dramatic event; it’s usually a dozen small, informally-agreed additions that quietly add up to thousands of dollars of unpaid work.
The fix is procedural, not complicated: get every change in writing before you start, price it accurately, and track it like it’s a separate contract — because legally, it functions like one.
What Is a Change Order?
A change order is a written modification to the construction contract — it can change scope, price, schedule, or all three. Once signed by both parties, it becomes part of the binding contract, with the same legal force as the original agreement.
Most standard construction contracts include a no-oral-modification clause, requiring that any change to the contract be in writing to be enforceable. Courts generally enforce these clauses, though there’s an important exception worth knowing: many jurisdictions recognize that a written-modification requirement can itself be waived by the parties’ conduct — for example, if an owner has a consistent pattern of verbally authorizing extra work and paying for it without a formal change order, a court may find that pattern effectively waived the writing requirement for that specific relationship. That exception is not something to rely on, though — it’s inconsistent, fact-dependent, and far weaker protection than simply following your own process every time.
Why Change Orders Matter
Change orders protect both sides. For you, they document what’s being added, its cost, and that you have actual approval before you spend money and labor on it. For the owner, they create a clear record of exactly what’s being paid for and a chance to decide, before the cost is incurred, whether they actually want it.
Without a change order, the dispute that follows is entirely predictable: you say the work was requested and extra; the owner says it was part of the original scope. Absent a signed change order, that dispute usually comes down to whose version of events is more credible — which is a much weaker position than simply having a document that settles it.
Common Sources of Changes
Owner requests — additional square footage, upgraded materials, added features — are intentional and known to the owner at the time. These are the easiest to document, because the owner is aware they’re asking for something new; get written approval before starting.
Design changes from the architect or engineer often carry both cost and schedule impact and should trigger a change order the moment the revised design is issued, not after the work is already underway.
Hidden or differing site conditions — unexpected soil conditions, damaged existing infrastructure, hazardous materials — are addressed differently in many contracts through a specific “differing site conditions” clause, which can entitle you to a price and time adjustment even without a separate change order request, provided you give the required notice promptly upon discovery. Know whether your contract has this clause; if it does, the notice timeline is usually short and procedural compliance matters as much as the underlying facts.
Regulatory changes — a mid-project code update, a new permit requirement, an inspection finding — need to be documented and priced the same as any other change, even though neither party caused them.
Site conditions that differ from the plans — unmarked underground utilities, existing structures not shown on drawings — should be documented immediately, both for pricing purposes and because they may overlap with the differing site conditions clause above.
The Change Order Process
1. Identify the change. Recognize it as a change before you touch it. Don’t start work on the assumption you’ll sort out payment later.
2. Document it specifically. Vague descriptions cause disputes. “Paint the den” invites disagreement; “Paint the den walls with [specific product, finish, and color], two coats over primer” doesn’t.
3. Calculate the cost. Price materials, labor, and equipment realistically — inflated pricing damages trust and invites pushback; underpricing costs you money you can’t recover later.
4. Determine schedule impact. Figure out whether the change adds days to the critical path, and adjust the completion date in the change order itself if it does — an unaddressed schedule impact today becomes a much harder delay claim to prove months from now.
5. Submit a formal change order referencing the original contract, describing the change specifically, stating the price and schedule impact, and setting a deadline for approval (a clear deadline avoids the change order sitting unanswered indefinitely while you wait to start work).
6. Get written approval before starting. A signed change order or a written email approval is enforceable; a verbal “yes” generally is not, and is exactly the gap an owner will exploit later if the price becomes inconvenient.
7. Document the work as it happens. Photos, daily logs, and tracked labor hours prove you performed what the change order described — this matters even after approval, because disputes over the extent of change order work are just as common as disputes over whether it was authorized at all.
Common Change Order Mistakes
Starting work before approval is the single most expensive mistake in this list — if the owner later declines to sign, you’ve performed the work with no enforceable right to payment beyond a difficult, fact-dependent claim in quantum meruit (a legal theory that lets you recover the reasonable value of work performed even without an enforceable contract, but is far less reliable and often produces a lower recovery than a priced change order would have).
Vague descriptions, underestimated pricing, and missed schedule impact all create disputes that a specific, accurate change order would have prevented — each of these is a documentation failure, not a pricing philosophy problem, and each is fixable with a consistent process.
Verbal-only approvals leave you with no proof if the relationship later turns adversarial — get something in writing every time, even if it’s just a confirming email after a verbal yes.
Not tracking time and materials on approved change order work invites disputes over quantity even when authorization was never in question — keep the same daily documentation discipline for change order work that you’d use for the base contract.
Pricing Change Orders
Price materials at actual cost with supplier quotes, adding a reasonable waste factor (commonly 5% to 10%). Price labor at your standard rate — not inflated, not discounted — based on a realistic estimate of the hours the specific work will actually take. Include equipment rental and, where the change extends the project timeline, extended overhead costs for the added duration. Markup on change order work commonly runs 10% to 20%, though what’s acceptable varies by owner and by contract — some owners’ standard contract forms cap change order markup explicitly, so check before assuming your normal margin applies.
Documentation to Keep for Every Change Order
Keep the signed change order and any written approval correspondence together and organized — this is your primary evidence if a dispute arises later. Keep daily logs, timesheets, material receipts, and photographs specific to the change order work, separate from your general project documentation where practical. Invoice change order work separately from the base contract so there’s no ambiguity later about which portion of a payment corresponds to which scope.
Preventing Scope Creep
The most effective prevention starts before the change ever arises: a detailed original scope of work, specific enough that there’s little room to argue later about what was or wasn’t included, closes off the most common source of disputes before they start. Getting that original scope language right — and building in clear procedures for how changes will be handled — is worth doing carefully at the contract-drafting stage; Construction Lawyer’s contract drafting team regularly builds change-order procedures directly into the base contract for exactly this reason.
Regular communication with the owner surfaces potential changes before they’ve already happened, and setting expectations early — explaining that extra work requires written approval before it’s a discussion point rather than a surprise — heads off the awkward moment where an owner assumes a request was included. A running change order log, tracking every change and its approval and payment status, closes the loop and makes sure nothing slips through unbilled.
Change Orders for Subcontractors
If you’re a subcontractor, your change order generally has to flow through the general contractor rather than directly to the owner — you request the change from the GC, who in turn may need the owner’s approval before authorizing you. The GC may modify or negotiate your pricing along the way, so get written approval directly from the general contractor regardless of what happens above them, and don’t rely on the owner’s approval of the underlying change as proof that your specific price was approved.
When Owners Refuse to Pay
If an owner disputes a change order — claiming it was included in the original scope, that approval never happened, or that the work wasn’t done — your documentation is what resolves the disagreement. Start with a formal demand letter referencing the signed change order and the approval record; many disputes resolve at this stage simply because a clear paper trail leaves little room to argue. If that fails, a mechanics lien is often available for unpaid change order work the same as for base contract work, and if a lien isn’t a viable option, litigation or arbitration remains. On any private residential or smaller commercial project, confirming your contract’s specific change order and dispute procedures — since some domestic construction contracts impose their own notice and cure requirements before a dispute can proceed — is worth doing before you send a demand; Construction Lawyer’s domestic contracts team reviews exactly this kind of contract language.
Key Takeaways
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Change orders must be in writing to be reliably enforceable — verbal approval is a gap an owner can exploit later.
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Specific descriptions prevent disputes; vague ones invite them.
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Price materials, labor, equipment, and markup accurately, and account for schedule impact in the change order itself.
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Never start extra work before getting written approval — the cost of waiting is almost always less than the cost of unpaid work.
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Document the work as it happens, and invoice change order work separately from the base contract.
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A clear original scope of work is the cheapest form of scope-creep prevention available.
Worried about scope creep or an unpaid change order? Our law firm helps contractors draft change orders, negotiate with owners, and pursue payment for unapproved or disputed work. Contact us for a free consultation about managing changes on your projects.