How to Write a Change Order (Contractor Template)

A 2023 NAHB study found that the average residential remodel hits 2.4 change orders before final payment — and contractors who relied on verbal agreements collected on only 61% of them. The fix isn’t a 12-page contract addendum. It’s a one-page document that names the change, prices it, and gets signed before anyone picks up a tool. Here’s exactly what to put on it, a copy-paste template, and how to present it without sounding like a lawyer.

What a change order actually is

A change order is a written amendment to the original contract or proposal that documents a change in scope, price, or schedule. It is not a new contract. It points back to the original agreement, names what changed, and updates the numbers. Three things trigger one:

• Owner-requested — the customer adds work (“while you’re here, can you also…”)
• Field condition — you uncover something that wasn’t visible at bid (rotted subfloor, undersized panel, asbestos)
• Spec change — the customer swaps materials or finishes after the contract is signed

Why verbal change orders cost real money

Three numbers from the field that show why this matters:

• The American Subcontractors Association tracks an industry-wide collection rate of about 60% on undocumented change order work, compared to 94% on signed change orders.
• The average residential change order is $1,400–$2,800. Two unbilled change orders per year on five jobs is $14,000+ in lost margin.
• In small-claims court, the contractor carries the burden of proving the change was authorized. A text message saying “sounds good” is admissible but weak. A signed change order is decisive.

The cost of writing one is 5 minutes. The cost of skipping one is 30 days of arguing with a customer who “doesn’t remember saying that.”

The 6 fields every change order needs

1. Change order number — sequential per job (CO-01, CO-02). Lets you reference it on the final invoice.
2. Reference to the original contract — contract number or signed date plus original total. Anchors the change to the agreement.
3. Description of the change — plain language, 2–4 sentences. What is being added, removed, or substituted, and where in the work it sits.
4. Cost adjustment — labor, materials, and any markup broken out separately. A single lump sum invites pushback; a line-item makes it feel like a quote, not a hostage situation.
5. Schedule adjustment — new completion date if the change affects timeline. Even “no change to schedule” should be stated explicitly.
6. Two signature blocks — yours and the customer’s, each with a date. No signatures = no work done on the change.

A copy-paste change order template

Keep it to one page. Most jobs need nothing more than this:

CHANGE ORDER #CO-01
Project: Kitchen remodel, 412 Oak St
Original contract: signed March 14, 2026 — Contract total $42,800

Change description: Replace existing 100-amp main panel with new 200-amp panel after discovering original panel is at capacity and cannot support the new induction range and dishwasher circuit added in the kitchen scope. Work includes new panel, permit, inspection, and patching of drywall behind panel.

Cost adjustment:
Labor (8 hrs @ $95): $760
Materials: $1,180
Permit and inspection: $215
Markup (15%): $323
Change order total: $2,478

Revised contract total: $45,278
Schedule impact: +2 working days. New substantial completion date: April 18, 2026.

Approved by (customer): _______________________ Date: __________
Approved by (contractor): _____________________ Date: __________

That’s the whole document. Roughly 180 words, signed in 30 seconds on a phone or a clipboard. Anything longer creates friction; anything shorter is missing one of the six fields above.

How to present it without losing the customer

The change order itself is fine. The conversation around it is where most contractors lose money. Four moves that work:

• Lead with what you found, not what it costs. “The existing panel is at capacity” lands differently than “this is going to cost you another two grand.” You’re reporting a condition, not selling an upsell.
• Show the math. Customers will absorb a number they understand. They will fight a number that arrives without breakdown.
• Pause work, on paper. The change order should explicitly say “related work paused pending approval.” This removes the implication that they can verbally approve now and renegotiate later.
• Get the signature before any new work starts. No exceptions, even for repeat customers. The 5 minutes you save by skipping signature is the same 5 minutes that ends in a lien filing six months later.

FAQ

Do I need a change order for a $50 change?

Yes — just shorter. A two-line emailed change order with a reply confirming “approved” is enough for anything under $200. The discipline of always documenting matters more than the format of any single document.

What if the customer refuses to sign?

Stop work on that portion of the scope and put it in writing. “Per our conversation today, work on the panel replacement is paused until the change order is signed. The rest of the contracted scope continues.” A refusal to sign is a refusal to authorize — doing the work anyway is doing it for free.

How is a change order different from an addendum?

An addendum modifies the contract before work begins (added scope at sign-up, new warranty terms, payment schedule changes). A change order modifies the contract during the work. Same legal weight, different timing.

Can I email a change order or does it need a wet signature?

In all 50 US states, the federal E-SIGN Act makes electronic signatures enforceable for construction contracts. A typed name in an emailed PDF with a clear “I approve this change order” reply is binding. Wet signatures are belt-and-suspenders, not a legal requirement.

Should the change order include a payment due date?

Yes — tie it to a milestone, not a calendar date. “Change order #CO-01 invoiced upon substantial completion of the change work, due net-15” is cleaner than “due April 30.” You don’t know yet when you’ll finish.