What a change order actually contains
Every change order does four jobs. Miss one and it stops working as a change order:
- The change itself — what is being added, removed or substituted, and where, written so that someone who was not on site could tell what happened. "Add floor heat" is a note; "supply and install 40 sq ft of electric floor-heating mat under the new bathroom tile, on the existing subfloor, with a programmable thermostat beside the light switch" is a scope.
- The price — the labor, the material, the disruption to the sequence, and the return trip. A deduction is written as a negative.
- The schedule impact — in calendar days, and the revised substantial-completion date. This is the line free forms most often leave blank, and a completion date that slid without anyone saying so is a recurring reason a customer starts paying slowly.
- Both signatures — contractor and customer, dated, before the changed work starts.
The line most change orders leave out
A typical free change-order form records the change and its price, and stops there. The customer signs a small number in isolation, keeps the original contract figure in their head, and is surprised by the final invoice — which is exactly what the form was supposed to prevent. (The industry's standard form, the AIA G701 change order (opens in new tab), does carry the running math; the free downloads rarely do.)
A change order that carries the running contract math solves it. Five lines, in order:
- A — the original contract amount
- B — every change order approved before today
- C — the subtotal, A + B
- D — this change, an addition or a deduction
- E — the new contract amount, C + D
Line E is what makes the document a change order rather than an invoice for extras. The customer is not signing a delta; they are signing what the job now costs, weeks before the invoice that would otherwise have started an argument. Line B comes off a running register — a change order log — so the figures reconcile across the whole job rather than being reconstructed at the end from a pile of scraps.
You can take a free fillable change order form with lines A–E on it — no signup, no email. That one page handles one change. The work authorization whose exclusions define what counts as a change, the register behind line B, and thirteen more documents are what the paid Trades Client Paperwork & Change-Order Template Pack adds.
When you need one
Before doing anything that is not in the scope section of the original authorization. In practice that includes several things contractors routinely do for free:
- Work the customer asked for casually, on site, while you were standing there.
- Work you suggested and they nodded at.
- An allowance overrun — the tile that came in at twice what was budgeted, and the extra labor a heavier tile needs.
- A substitution you made because the specified item was discontinued — even when the price is identical, because the specification changed.
- Work created by something found behind a wall. That normally starts with a written unforeseen-condition notice and its options, and the change order follows once the customer has chosen one.
Change order mistakes that cost money
- Doing the work first and papering it afterward. A change order signed after the tile is down is a bill, and it is argued about like one. Signed before, it is an instruction, and it gets paid.
- Skipping the small ones. The extra outlet, the second coat, the shelf while you are in there. Each is too small to feel worth the paperwork; six of them is a day of unpaid work and a week of unexplained schedule slip.
- Leaving the schedule line blank. Two days on each of six change orders is nearly two weeks. Write the days even when the answer is zero.
- Recording the delta but not the new total. Without line E, the surprise simply moves to the final invoice.
- Relying on a verbal agreement. Several states require changes to a residential home-improvement contract to be in writing and signed by the homeowner before the changed work begins, and an unsigned extra can be unenforceable as part of the contract however clearly the customer asked for it. California, for example — Bus. & Prof. Code § 7159 (opens in new tab) makes a change order part of the contract only if it is in writing and signed before the changed work starts. Some states still leave a contractor other grounds on which to pursue payment — a slower, less certain and more expensive route than a signed page.
Where the local rules come in
What a change order must contain is partly a matter of state law. Some states require it to restate the revised total contract price and the revised completion date; some set out how it must be signed and when the homeowner must receive their copy. A change large enough to need a permit amendment or a fresh inspection carries that obligation separately — the form does not satisfy it. This page is a general explanation, not legal advice; check your own state's home-improvement statute, and have a construction attorney read your contract documents once.
Related templates and concepts
A change order is only meaningful against a scope that said what it was not, which is why the exclusions list on a work authorization matters so much. The price on it should carry the same bid markup as the original job — scope creep is where margin leaks. For the procedure rather than the definition, follow one written end to end in the how to write a change order tutorial, weigh owned documents against a subscription in paperwork templates vs a contractor app, or browse every tool on the templates for contractors hub.
