Change orders: how to bill for mid-project scope changes

A change order is a one-page written amendment that records extra work a client asked for after the project started, what it costs and how it moves the deadline. Send it the moment the request arrives, before you touch the new work, and wait for approval before you start.

That one habit decides whether a project stays profitable. Most businesses do not lose money on the work they quoted. They lose it on the work they never quoted: the extra page, the second logo concept, the quick data export, each arriving in a friendly email with no price attached.

Scope creep is a paperwork problem

It is tempting to treat scope creep as a story about pushy clients. The data reads more like a story about missing process.

The Project Management Institute's Pulse of the Profession 2023 report found that 40% of projects at organisations that give low priority to "power skills" such as communication saw scope creep, against 28% at organisations that prioritise them. Those weaker organisations also lost 25% of their budget when a project failed, compared with 17% for the stronger ones. PMI studied larger organisations, not solo businesses, so read it as a pattern, not a forecast for your next job.

The lesson still carries over. Projects spiral when nobody writes the change down and says the price out loud. A change order is that sentence in a form the client can approve.

What counts as a change

Not every request needs a form. A change is anything that adds to, or replaces, something written in the original scope. Use the original proposal or contract as the test.

• Adding a deliverable: a Spanish version of five pages, a fourth logo concept, a second round of video cuts.
• Replacing a deliverable: "we have decided on a different layout for the whole homepage."
• Changing an input: new brand files after you finished the first pass, or content that arrives late and forces rework.
• Extending a limit: a third round of revisions when the contract says two.

These are not changes: fixing something you got wrong, a small clarification inside an agreed deliverable, or revisions within the rounds you already sold. If you are unsure, treat it as a change and say so kindly. The cost of asking is a short email. The cost of not asking is the margin.

The change order is five lines

Keep it short enough that the client reads it. Five lines do the job.

1. What is changing, in plain language. "Add a Spanish version of the five core pages."
2. Who asked and when. This is a record, not blame.
3. The price, as one number, not a range.
4. The effect on the timeline. "This adds four working days and moves delivery to the 22nd."
5. One approval line. "Reply 'approved' and I will begin."

Send it as soon as the request lands, in the same thread, and say in one sentence that the work starts once it is approved. Do not start "just to be helpful." The moment you do, the price becomes a negotiation.

Price the change without guessing

Use the same logic as the original quote, so the number feels fair and not invented on the spot.

If the project is priced by deliverable, price the new deliverable at the same rate as comparable ones in the quote. If it is priced by time, estimate hours and multiply by the same rate. If the work interrupts a schedule that is already full, add a rush fee and say what it is. For help getting the estimate right in the first place, see the guide to estimating a project without underquoting.

Two details help. Show the change as a separate line, never folded into the original total, so everyone can see what the extra work cost. And price the knock-on effect, not just the task: a new section on a site also means more testing, more revision rounds and more project management.

The sentence that makes it stick

Say this when the request arrives, and mean it: "Happy to add that. It sits outside what we agreed, so I will send a short change order with the price and the new date. Once you approve it, I will start."

That sentence is friendly, it does not accuse anyone, and it sets the pattern for the rest of the project. Clients who hear it once tend to ask "what will this cost?" on their own next time.

When the client pushes back

Pushback usually falls into three kinds.

"Surely this is small." Agree that it is small and price it small. A $150 line is easier to approve than a free favour, and it keeps the habit alive.

"I thought this was included." Point to the scope in the original document and offer a choice: add it for the stated price, or swap it for something else in the original scope of similar size. Having the original in writing is what makes this a calm conversation.

"Can you just do it and we will sort it out later?" Decline politely. "I would rather get it right than rush it. Approve the one-liner and I will start today."

Fixed price or hourly, the habit is the same

On a fixed-price job, the change order protects the price. On an hourly job, it protects the budget the client approved and the trust that comes from no surprises. In both cases the client agrees to the change before the work happens.

Written records are becoming the law

Several US jurisdictions now expect the terms of freelance work to be in writing. New York State's Freelance Isn't Free Act, in Senate Bill S5026, requires a written contract for work worth $800 or more. The Illinois Freelance Worker Protection Act applies when the work is worth $500 or more in a 120-day period. Los Angeles sets its threshold at $600 in a city summary of freelance worker protections.

A change order is not a legal filing, and these laws vary by place and by who is covered, so check yours with a lawyer. But a dated, approved amendment is exactly the kind of record those rules point toward. The overview in Freelance Isn't Free: the written-contract laws lists the places that have them.

Unbilled work is worse than late work

Late payment at least shows up on a clock. In the March 2026 quarter, small businesses in the US waited an average of 28.8 days to be paid and were paid 9.0 days late on average, according to Xero's small business index. That hurts, but you can see it and chase it.

Unbilled scope never starts a clock. It is not late, because it was never on an invoice. A project where you did 20% more work than you charged for is not a slow payer. It is a discount you gave without deciding to. If your invoices also land late, the guide to handling late-paying clients covers the other half of the problem.

A change order does not slow you down

The common fear is that asking for approval makes you look rigid. It does the opposite. Clients read a one-page amendment as proof that you run a tidy operation, and the approval takes seconds when the page is clear. The ones who object to paying for extra work were never going to pay for it. You find that out in the first week, not after you have delivered.

How Delivvo handles a change order from request to invoice

Delivvo keeps the original scope, the amendment and the invoice in one place, so a change order is a clear step instead of a stray email.

Delivvo has no button labelled "change order." You build the amendment from the tools it already has, and the result is a clean record.

1. Quote the extra work. Open proposals and create a short quote from your packages and add-ons. The new work, price and new delivery date are on one page.
2. Send it into the project. The client opens it in the client portal with a one-time code, no password. It sits next to the original proposal, contract and files, so nobody has to find the old thread.
3. Get a real approval. The client signs, typed or drawn. Delivvo stores a signing record with a SHA-256 hash, the IP address, the device and an archived PDF. That is the evidence you point to when someone says "I never agreed to that."
4. Invoice it. The approved amount goes onto an invoice with the next sequential number, or into a payment schedule of up to 12 payments if the extra work is large.
5. Get paid directly. The client pays through your own gateway, and Delivvo takes 0%. If a change order is large, a payment schedule lets you split it, so you are not waiting for the whole amount at the end.

The practical gain is that the original scope, the amendment, the signature and the invoice sit under one client record. When a client asks three months later why the bill went up, you open the project and show them, instead of scrolling through email.

For the base agreement, the contracts and e-signatures page shows how unlimited contracts and signatures work, and you can edit every clause. Delivvo's templates are starting points, not legal advice, so have a lawyer check any wording you rely on.

Delivvo is a CRM and client portal for service businesses. See Delivvo for teams.

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