Blog · September 19, 2026

Change order vs invoice on a residential job

A change order is a request to change scope, price, or time — usually with signature lines — before you have agreed. An invoice is a request to pay, sometimes after the work is already on the house. I read the label, the fields, whether work has started, and the running total of original plus extras. I do not call the extra legitimate.

The search is “change order vs invoice.” The email is “we had to add flashing; please pay this.” I do not decide extras. I check whether the paper is even a change order, which fields exist, whether the work already appears in the original, and the running total.

What a construction change order is

A change order (or change directive, or extra-work ticket) is supposed to describe work that was not in the original agreed scope, a cost, often calendar days, and a new completion date if days are not zero. It has signature lines for owner and contractor — architect too, if the original requires it. It should exist before extra work starts. On paper. Not as a hallway “as needed.”

What an invoice is

An invoice asks for money. It may reference a change order number. It may not. It may arrive after the siding is on, after a draw, or after final. The Cascade extras true-up — fictional, on the homepage — is a $17,000 invoice after a $24,500 fixed price. No photos. No running total. The finding is: is this a change order for me to agree to, or an invoice for work you already did?

Required fields I look for

• Label: change order, change directive, extra work, or invoice.
• Description of the work in plain language.
• Cost of this change, and currency.
• Time in calendar days, and new substantial completion if days are not zero.
• Signature lines. Who still needs to sign.
• Whether work has already started or been completed.
• Original contract sum, this change, new contract sum.

Lump-sum extras hide markup. I ask for labor, material, and markup broken out. I compare markup percent to the original contract if you uploaded it. Double markup — sub plus GC on an already marked-up number — is common and often silent. Ask whether markup is applied to the sub’s raw cost or to the sub’s already marked-up number.

Why the running total is first-class

Without original + all extras + this one, the job drifts in PDF attachments. I treat the running total as an output, not a footnote. Sequential numbers and dates help; unnumbered extras lose totals. If this extra is a large fraction of the original, I report the percent. I still do not call it a problem for a court. I ask for an itemized breakdown.

Overlap with the original or an allowance

The finding owners trust is overlap. Same work described in the original statement of work or specs. Same work already in an allowance — then it may be an allowance adjustment, not an add. Same work on a previous change order. Additive versus substitution: an upgrade should credit the original item. Design clarification versus new work: answering an RFI is not automatically extra. Weasel words in the original — “as needed,” “as required,” “complete X” — get quoted next to the extra.

I cannot see the jobsite. I cannot tell a hidden condition from one a competent contractor could have seen at bid. I ask. I do not verdict the extra.

Already started, rushed, or billed late

Work already in progress or finished means you are being asked to ratify, not decide. Deadline pressure — “sign today or the crew walks” — I record. I suggest you ask for a day to read it. What actually happens if you send it back tomorrow? Extras billed 100% immediately may skip retainage or holdback. Forgotten COs months later still want documentation. You are not signing a blank.

Questions that separate change order and invoice

1. Is this a change order for me to agree to, or an invoice for work you already did?
2. What was the original contract, what is this change, and what is the new total?
3. Please break this into labor, material, and markup.
4. I think this was in the original scope at [quote]. Was it excluded?
5. Does retainage or holdback apply to this extra the same as the original work?

Markup, backup, and unit prices already in the contract

If the original contract named a markup on extras, I look at whether this extra uses that percent. Contract 15% versus this 25% is a math question, not a morality play. Extra fees stacked on top of markup — project management, supervision, insurance, bonding — get a question: is markup supposed to cover overhead, or are these extra lines on top. Backup: quotes, hours, unit prices. No backup cannot be checked. If the original already had a unit price for rock excavation, ask whether this extra used it.

Credits are the quiet cousin. Work removed, a cheaper fixture, a wall that did not get built. Deductive change orders often lack paper. Ask where the credit is. Hidden damage “repairs as needed” with no photos from before it was covered: ask for the photos. I still will not tell you to pay or not pay.

Time is part of the extra even when the dollar line looks small. Calendar days and a new substantial completion date belong on the same page as cost. A cost-only extra that silently moves the end date is still a change to the record. Ask how many days this adds, and what the new completion date is.

Reason codes matter. Owner-requested, unforeseen, allowance overage, design clarification, inspector-driven, builder-deemed: those are not the same extra. “Bring up to code months later” is a different conversation from an owner upgrade. I record who asked and when. I do not decide whether the reason is fair. If work already started, you are being asked to ratify. Ask what the cost is if you say no — as a question, not as a threat I invent.

If the extra is dated after a draw or after final, I still want it documented. Forgotten paper months later is how running totals rot. Ask when it is due and whether the unpaid tail still applies. Then put it on the same running total as everything else. That is the whole job of this check.

Upload the extra and, if you have it, the original. I compare overlap and markup to that baseline. First completed analysis is free. Then $9. I will not say pay it. I will show fields, overlap, and the running total.

How to check one

Upload the extra. Optionally upload the original contract so I can check overlap and markup. First completed analysis is free. Then $9. I will not say pay it or do not pay it. I will show fields, overlap, and the running total. Related: the construction contract checklist, for the baseline this extra is claiming to change.