How to Write a Change Order in 5 Simple Steps

Scope changes are inevitable in construction. A client adds a feature, an inspector requires a correction, or hidden conditions surface behind a wall. The difference between getting paid for that extra work and absorbing the cost yourself usually comes down to one thing: whether you wrote a proper change order before the work began.

This guide walks you through the five steps to writing a change order that is clear, enforceable, and fast to produce, whether you are working on a million-dollar commercial project or a weekend bathroom remodel.

Why a Well-Written Change Order Matters

A change order is more than paperwork. It is a binding amendment to the original contract that protects both the contractor and the client. When written well, it eliminates the "I never agreed to that" conversation at the end of the project. When written poorly, or not at all, it becomes the starting point for disputes, delayed payments, and even litigation.

According to industry data, payment disputes related to scope changes are among the top reasons contractors file mechanic's liens. The root cause is almost always the same: the work was done, but the authorization was never documented. A clear, signed change order is the simplest way to prevent that outcome.

If you need a refresher on the basics first, start with our guide on what a change order is and why it matters.

Step 1 — Identify the Scope Change

Before you write anything, make sure you can clearly articulate what changed and why. Scope changes generally fall into three categories:

• Additions: New work that was not part of the original contract. Example: the client wants recessed lighting in a room that was originally spec'd for surface-mount fixtures.
• Deletions: Work removed from the original scope. Example: the client decides to skip the custom built-in shelving in the living room. The contract price decreases.
• Modifications: Existing scope items that are being changed. Example: upgrading from vinyl plank to engineered hardwood in the same square footage.

Pinpointing the category helps you frame the change order correctly and makes it easier for the client to understand what they are approving. If the change was triggered by the client, note that. If it was triggered by a site condition or code requirement, note that instead. The "why" matters just as much as the "what."

Step 2 — Document the Extra Work

This is the core of the change order: a written description of exactly what work will be performed, what materials will be used, and what the expected outcome looks like. Be specific. Vague descriptions are the leading cause of change order disputes.

Weak description: "Additional plumbing work in the basement."

Strong description: "Relocate existing 3/4-inch copper water supply line from north wall to south wall of basement (approximately 22 linear feet). Install two new shut-off valves and connect to existing wet bar sink. Work required due to client-requested relocation of wet bar from original plan location."

The strong description leaves no room for interpretation. It states the material, the quantity, the location, the reason, and the expected result. If a dispute arises six months later, this description tells the full story on its own.

Include supporting details where relevant: reference drawings, photo documentation of existing conditions, or specifications from the manufacturer. The more evidence you attach, the stronger the document becomes.

Step 3 — Price It Right

Every change order needs a clear cost breakdown. At a minimum, separate your pricing into these categories:

• Labor: Hours multiplied by rate, or a flat labor fee for the task.
• Materials: Itemized list with quantities and unit costs. Include supplier quotes if the client requests them.
• Equipment: Rental costs for specialty tools or machinery needed for the change.
• Subcontractor costs: If you are passing through a sub's quote, include it as a line item.
• Overhead and profit markup: Your standard markup percentage applied to the direct costs above. This is not optional. Your business has overhead, and extra work creates additional coordination, scheduling, and administrative effort.

Show the math. A client who can see exactly how you arrived at $3,200 is far more likely to approve the change order quickly than a client who receives a single lump-sum number with no explanation.

For a deeper discussion on pricing strategies, check out our article on how to price a change order without leaving money on the table.

Step 4 — Get It Signed Before Starting

This is the most critical step and the one most often skipped. A change order is not enforceable until both parties have signed it. Starting the extra work before you have a signature puts you at risk of not getting paid.

Contractors often skip signatures because the approval process feels slow. The client says "go ahead" on the phone, and you want to keep the project moving. But that verbal approval has no legal weight if the client later disputes the charge. Courts and arbitrators consistently side with whichever party has the written documentation.

The solution is to make signing fast. Electronic signatures eliminate the print-scan-email cycle entirely. When you can send a change order from your phone and get a signature back in minutes, there is no reason to start work without one.

For tips on preventing signature-related disputes, read our guide on how to avoid change order disputes.

Step 5 — Deliver the Signed Document

Once both parties have signed, the change order becomes part of the project record. Deliver a copy to the client immediately. This is not just a courtesy; it is a business practice that builds trust and prevents "I never received that" claims down the road.

Store your copy in a centralized, organized system. If you are managing multiple projects with multiple change orders each, a filing system that lets you search by project name, date, or change order number will save you significant time during invoicing and year-end accounting.

Update the running contract total. After every approved change order, the current contract value should be recalculated: original contract amount plus the sum of all approved change orders (additions minus deletions). This running total should appear on every subsequent change order and on your invoices.

Speed Up the Process with MyChangeOrder

The five steps above are straightforward, but executing them with Word documents, spreadsheets, or handwritten forms adds friction at every stage. You have to format the document, calculate totals manually, print it, get a wet signature, scan it, email it, and then file it somewhere you will remember.

MyChangeOrder compresses that entire workflow into about 60 seconds. Open the app on your phone or tablet, select the project, describe the change, add your line items, and tap send. The client receives a professional PDF, signs it electronically, and both parties get a copy instantly. Totals are calculated automatically, change orders are numbered sequentially, and everything is stored in the cloud for easy retrieval.

The faster you can produce a change order, the more likely you are to actually do it for every scope change, no matter how small. And that consistency is what separates contractors who get paid in full from those who leave money on the table.