The Change Order

The homeowner says “while you’re here, could you also…” and right there — standing in their kitchen, tools in hand — the most expensive sentence in the trades just landed. What happens next determines whether you get paid for the extra work or absorb it.

Before AI, what happened next was almost always nothing. A verbal nod. A handshake. Maybe a mental note to add it to the invoice. And when the invoice arrived with a line item the homeowner did not remember authorizing, you had a dispute with no paper trail. Undocumented scope creep runs 8-14% of total contract value on average, according to estimates traced through SpecFinder to FMI’s construction research. On a $10,000 job, that is $800 to $1,400 in work you performed but may never collect.

This session changes that. You pull out your phone, describe the change in one sentence, and before you put the phone down you have a formatted change order with scope, price, timeline impact, and a place for the customer to approve. The whole process takes a fraction of the time it would take to write one by hand. And this time, the change order actually gets written.

Why this is the highest-value session

Every session in this code camp saves you time. This one saves you money.

Change orders are where documentation discipline breaks down fastest — and where the legal consequences are steepest. CoConstruct’s analysis of nearly 30,000 residential projects found an average of 6.3 change orders per project in the $250,000-$500,000 range. That is 6.3 moments per project where you are standing on the job site, the customer is asking for something extra, and writing up a formal change order feels like more trouble than the addition is worth.

At 6.3% average net margins on a $300,000-a-year business, the math is unforgiving. A few absorbed scope changes across a dozen jobs can eliminate a quarter of your annual profit. Not because any single one was large. Because they add up, and there is no paper trail to recover them.

The change order prompt below is designed for that exact moment. You are on the job site. The customer just asked for something extra. You have your phone. In the time it takes to describe the change — by voice or by typing — you get a document with all six elements that courts and statutes require, formatted to send as a text message, with your state’s specific rules applied automatically.

The paperwork is the armor. This session forges it in real time.

The six-element framework

Every change order generated by this prompt contains six elements. This is not a formatting preference. It is a framework derived from the AIA G701 industry standard, California’s BPC 7159 statutory requirements, and cross-jurisdictional construction law analysis. Six elements. Every time.

1. Date — when the change was agreed to
2. Scope description — what work is being added, removed, or modified, specific enough that a third party can understand exactly what changed
3. Price adjustment — the dollar amount, with shown math
4. Timeline impact — how the change affects the completion date
5. Reference to the original contract — identifying the project and the agreement being amended
6. Customer acknowledgment — evidence that the customer agreed before work began

“Fix the bathroom” is not a scope description. “Replace corroded brass shut-off valve at water heater with new 3/4-inch brass ball valve” is defensible. The specificity is not bureaucracy — it is the difference between getting paid and arguing about what was agreed.

Step 1: Open a new conversation and paste the prompt

Open Claude, ChatGPT, or Gemini. Start a new conversation. Copy the prompt below and paste it as your first message.

Step 2: Paste your business profile and the original estimate

The AI will ask for your business profile first. Paste the profile you built in Session 1.

Then it will ask for the original estimate and the change. Paste the estimate — or, if you do not have it handy, describe the original job briefly: customer name, address, what the job was, the total. The AI needs enough to reference the original scope in the change order.

If you set up a Claude Project, Custom GPT, or Gemini Gem in Session 1, your business profile is already loaded. You still need to paste or describe the original estimate for this job.

Step 3: Describe the change

This is where voice input earns its keep. You are on the job site. Your hands may be dirty. Tap the microphone on your keyboard and say it:

“Customer wants the shut-off valve replaced while I have the water off. Half hour labor, thirty-five dollar valve.”

That is enough. The AI fills in the structure. If your description is unclear, the prompt instructs it to ask one or two short follow-up questions rather than generating from ambiguous input. It will not guess.

You can also type it. “Add shut-off valve replacement, $47.50 labor (0.5 hr × $95), $35 parts, 30 more minutes” works just as well. The AI is not particular about format — it is particular about having the information.

Step 4: Review the numbers

The AI will generate the change order and then remind you to check the numbers. Do it.

Three things to verify every time:

1. The price adjustment math. The AI shows its work — “0.5 hours x $95/hr = $47.50” — so you can see what it calculated. Check it against your actual rate and your actual time estimate. The AI did not price this job. You did. It formatted what you told it.

2. The revised total. Original estimate plus this change order. This is where compounding errors surface. If you have had multiple change orders on this job, verify the running total against your own records. Do not trust the AI’s arithmetic — use your phone calculator.

3. The scope description. Read it as if you are the homeowner. Is it clear what work you are adding? Would a third party — a mediator, a small claims judge — understand exactly what changed? “Replace valve” is not enough. “Replace corroded 3/4-inch brass shut-off valve at water heater location with new brass ball valve” tells everyone what was done.

The AI did not calculate your change order. It predicted what a change order might look like based on the numbers you gave it. That is why you check the math before you send it. Same rule as the estimate — you would not send numbers to a customer without checking them by hand. Same rule applies here.

Step 5: Copy and send to the customer

On Claude, the change order appears as an Artifact — a separate document you can copy or download. On ChatGPT, it renders in Canvas. On other platforms, it appears between ===== BEGIN CHANGE ORDER ===== and ===== END CHANGE ORDER ===== markers — copy everything between those markers.

Send it to your customer by text. A text message with a formatted change order — scope, price, timeline, and a request for approval — is vastly better than a verbal agreement. Courts in multiple jurisdictions have held that text messages can constitute a “writing” under the Statute of Frauds. In St. John’s Holdings v. Two Electronics (Massachusetts, 2016), the court found that essential contract terms can be spelled out over multiple writings read together. Text messages are legally equivalent to paper as records under ESIGN and UETA, adopted in 49 of 50 states.

But — and this matters — the legal landscape for text-as-contract is unsettled. In Walsh v. Abate (Florida, 2022), the court reached the opposite conclusion, finding that unsigned text messages were insufficient to modify a contract. The safest approach: use the text as evidence of an agreement that should also be signed. Get the signature before you start the extra work.

One more thing to watch for: casual texts can create accidental commitments. A text that says “I can probably do that for around $200” might be read as a binding offer. The change order generated by this prompt avoids that problem — it is structured as a formal document with a place for both parties to sign, not a casual message. Keep your informal texts informal, and let the change order carry the terms.

Step 6: Get it signed before starting the extra work

This is not optional. This is the step that separates a documented change from a disputed one.

California law (BPC 7159) requires that change orders for home improvement contracts be in writing and signed by both the contractor and the property owner before the changed work begins. Not after. Before. A non-compliant change order in California can give the homeowner the right to demand a full refund, and non-compliance is a misdemeanor with fines up to $5,000. (AGR Law; Wolff Law)

Pennsylvania strips your legal right to payment for work performed under an unsigned change order — and exposes you to treble damages under the Home Improvement Consumer Protection Act. A $500 addition can become a $1,500 judgment against you, plus attorney fees.

New York requires all amendments to home improvement contracts to be in writing and signed by both parties under General Business Law Section 771.

Texas does not have a prescriptive change order statute for residential work, but the Prompt Payment Act requires payment within 35 days of invoice — a deadline the prompt encodes automatically.

Florida sets a 14-day payment deadline under the Prompt Payment Act.

If you work in a state not listed above, the prompt includes a general provision advising both parties to sign before work begins. That is the most conservative default, and it is the safest one. A change order that satisfies California’s requirements will satisfy requirements everywhere else.

The signature can be on paper or digital — both are legally valid in all 50 states under the ESIGN Act and UETA. On the job site, the fastest approach: show the customer the change order on your phone, have them reply “approved” by text, and screenshot it. Not as strong as a physical signature, but miles ahead of a verbal nod.

Step 7: Save with the job file

Save the change order alongside your original estimate. If you are using the folder structure from this series — one folder per job, all documents inside — drop it in. If you are not, email it to yourself with the customer’s name and address in the subject line.

Every document you save now is a document you do not have to recreate later. The estimate, the change order, the invoice, the completion record — by the time you reach Session 5, you will have a complete project file built one document at a time as a byproduct of work you were already doing.

What the output looks like

Here is what the prompt produces using the Garrison Plumbing sample profile from Session 1. The scenario: Mike Garrison is replacing a water heater for a customer. During the job, the customer notices the shut-off valve is corroded and asks to have it replaced while the water is already off. On Claude, this appears as a formatted document in an Artifact panel.

That is the whole document. Compact enough to send as a text. Clear enough for both parties. All six elements present. The Texas Prompt Payment Act provision applied automatically because the business profile says Texas.

Level Up: Save it as a persistent setup

If you set up a Claude Project, Custom GPT, or Gemini Gem in Session 1, add this change order prompt alongside your estimate prompt. Same project, same profile, different prompt for different documents.

Claude: Open your existing Project. Add the change order prompt as a new conversation starter or paste it as project instructions alongside the estimate prompt. Your business profile is already loaded.

ChatGPT: Create a second Custom GPT with the change order prompt as its instructions. Or keep one GPT and paste the prompt at the start of each conversation — either approach works.

Gemini: Add the change order prompt to your existing Gem’s instructions, or create a separate Gem for change orders.

The goal is the same as Session 2: eliminate the copy-paste step so the only thing you type (or say) is the job details and the change. The prompt and the profile are already there.

The bilateral protection

A change order is not a document you use against the customer. It is a document that protects both of you.

The homeowner gets clarity — exactly what they are authorizing, exactly what it costs, exactly how it affects the timeline. No surprises on the invoice. No “I thought that was included.” The moment they sign is the moment they understand what they are paying for, and that understanding prevents the dispute that would have cost both of you time and money.

You get documentation — proof that the scope changed, proof that the customer authorized the change, proof that the price was agreed before the work began. If the homeowner later says “I didn’t authorize that,” the signed change order answers the question.

Frame it that way when you hand it to the customer. Not “I need you to sign this.” Instead: “Here’s exactly what you’re authorizing — the scope, the cost, and how it affects the timeline. I want to make sure we’re both clear before I start the extra work.” The document is the same. The framing changes who it feels like it serves.

State coverage

The change order prompt includes encoded rules for five states: California, Texas, Florida, New York, and Pennsylvania. These provisions were drawn from primary statutes, not generated by AI. If you work in one of these states, the correct provision is applied automatically based on your business profile.

If you work in a different state, the prompt applies a conservative default: “Both parties should sign this change order before the changed work begins. Check your state’s requirements for home improvement contract amendments.” That default protects you in most jurisdictions, but it does not substitute for knowing your state’s specific rules. If your state has prescriptive change order requirements — and several do — verify them independently.

This is not legal advice. The prompts in this series encode general principles from verified state statutes. They do not cover every jurisdiction, every situation, or every exception. If you are facing a dispute that exceeds your state’s small claims limit, consult a licensed attorney.

What you built

You now have a change order prompt that turns a one-sentence description into a formatted document with all six elements — date, scope, price, timeline, contract reference, and customer acknowledgment — with your state’s rules applied automatically.

The next session closes the loop. The job is done. You are standing in the customer’s kitchen. Before you load the truck, you are going to generate the invoice, save the completion record, and get paid. Session 4 handles all of it.

The change order you just built is the document you were least likely to create by hand and most likely to need in a dispute. Now it takes a fraction of the time, and it actually gets written. That is the point. Not faster paperwork for its own sake — faster paperwork so the armor exists when you need it. Get back to your craft.