The Complete Guide to Construction Change Orders
Change orders are where contractors either protect their profit or give it away. This guide covers what to include, how to price them, how to get them signed, and the mistakes that cost you money.
The Conversation That Changes Everything
You are three weeks into a bathroom remodel. Demo is done, plumbing is roughed in, and the tile guy is coming next Tuesday. Then the client walks in and says, “While we are at it, can we also redo the closet in the hallway?”
If you say “sure, no problem” and keep working, you just donated your time and materials to unpaid work. If you say “absolutely, let me write that up as a change order,” you protect your margin, set clear expectations, and maintain a professional relationship.
Change orders are not paperwork for the sake of paperwork. They are the single most important financial protection tool a contractor has once a project is underway.
Change orders are present in the majority of construction projects. They are the norm, not the exception. If you do not have a system for handling them, you are giving away profit on nearly every job.
What Exactly Is a Change Order?
A change order is a formal, written modification to the original contract scope, price, or timeline. It documents any change that differs from what was originally agreed to.
Change orders can be triggered by:
- Client requests – the client wants something different, additional, or removed from the original scope.
- Unforeseen conditions – you open a wall and find mold, rot, or outdated wiring that was not visible during the estimate.
- Code requirements – the building inspector requires upgrades that were not anticipated.
- Material substitutions – the specified material is unavailable or significantly more expensive than when the contract was signed.
Regardless of the cause, the process is the same: document the change, price it, get approval in writing, and then do the work.
Why Change Orders Matter More Than You Think
Financial Protection
Without a change order, extra work is a gift. You cannot bill for it or prove it was requested. In court or arbitration, verbal agreements are nearly impossible to enforce.
Timeline Management
Every change affects the schedule. Adding a closet renovation to a bathroom remodel does not just add cost, it adds days. A change order that documents the timeline impact protects you from claims of “taking too long” when the client added scope.
Relationship Preservation
Change orders eliminate surprises. The client knows what the change will cost and how long it will take before any work begins. Contractors who skip change orders end up in uncomfortable money conversations at the end of the project. “I thought that was included.” These conversations destroy referrals and reviews.
Legal Protection
A signed change order is a legally binding contract modification. Without it, you are relying on a he-said-she-said argument that rarely ends well for the contractor.
What Every Change Order Should Include
- Change order number – sequential numbering (CO-001, CO-002) tied to the original contract
- Date – when the change was requested and when the change order was issued
- Project name and address
- Description of the change – detailed and specific. “Additional work in hallway” is not enough. “Remove existing hallway closet shelving, install new custom built-in shelving unit (72″ H x 48″ W x 24″ D), prime and paint to match existing trim” is what you need.
- Reason for the change – client request, unforeseen condition, code requirement, etc.
- Cost breakdown – materials, labor, subcontractor costs, markup, and total
- Schedule impact – how many additional days the change adds
- New contract total – original amount plus all approved change orders to date
- Signature lines – for both contractor and client, with date
How to Price Change Orders (Without Underselling Yourself)
1. Direct Costs – the actual cost of materials, labor, and any subcontractor work.
2. Markup – your standard markup for overhead and profit. This should be the same percentage you use in your original estimates. Do not discount your markup on change orders.
3. Administrative Fee – a flat fee ($50-$250) or small percentage (5-10%) to cover the time of managing the change: stopping current work, re-planning, re-ordering materials, and preparing documentation.
Sample Pricing Breakdown
A client wants to add recessed lighting (6 cans) to a kitchen remodel that originally did not include electrical work.
| Line Item | Detail | Cost |
|---|---|---|
| Materials | 6 LED recessed light kits, wire, boxes, switch | $420 |
| Electrician labor | Licensed electrician, 6 hours at $85/hr | $510 |
| Patching/painting | Ceiling repair, 2 hours at $55/hr | $110 |
| Direct cost subtotal | $1,040 | |
| Overhead + profit (25%) | Standard markup | $260 |
| Admin fee | Documentation, coordination | $100 |
| Change order total | $1,400 | |
Transparent, professional, and defensible. The client sees exactly what they are paying for.
Getting the Client to Sign
Many contractors freeze up here. They know verbal approval is risky but do not want to “make a big deal out of it.”
Asking for a signature is not confrontational. It is professional. Clients expect it from doctors, lawyers, and auto mechanics. Contractors should be no different.
How to Frame It
Never say: “I need you to sign this before I can do the work.”
Instead say: “I put together the details on what we discussed. Take a look and make sure everything matches what you had in mind. Once you sign off, we will get it scheduled.”
The first version sounds like you are protecting yourself from them. The second sounds like you are protecting them from misunderstandings.
What If the Client Refuses to Sign?
Do not do the work without written approval. You can say: “The change order just confirms what we agreed to. I am happy to adjust any details if something does not look right.”
If they still refuse, that is a red flag. It suggests they may dispute costs later.
Set the expectation in your original contract. Include a clause that states any changes will be documented via a written change order and approved in writing before work begins. When the first change comes up, the client already knows the process.
5 Common Change Order Mistakes
1. Doing the Work Before Getting Approval
Once the work is done, you have zero leverage. The client can say “I never asked for that” or “I thought it was included.” Always get the signed change order first.
2. Vague Descriptions
“Additional work in master bath” is not a description. It is an invitation to a dispute. Be specific: what work, what materials, what dimensions, what finishes.
3. Discounting Your Markup
Some contractors reduce their markup on change orders as a “goodwill gesture.” This trains the client to expect discounts. Your markup covers overhead and profit. Apply it consistently.
4. Not Documenting Timeline Impact
A change that adds $2,000 might also add 3 days. If you do not document it, the client will hold you to the original completion date.
5. Waiting Too Long to Issue the Change Order
Do not wait until the end of the project to compile all changes into one big change order. Issue each one as the change comes up. Real-time documentation is more accurate and less likely to trigger sticker shock.
Every one of these mistakes comes down to avoiding a slightly uncomfortable conversation now and paying for it with a much more uncomfortable conversation later.
Using Change Orders to Kill Scope Creep
Scope creep is the silent killer of contractor profitability. Each request seems minor, but over a 4-week project, twenty small requests can add up to 20-30 hours of unbilled labor and $500-$1,000 in untracked materials. On a $30,000 project with a 20% margin, that scope creep just ate half your profit.
Where to Draw the Line
- Under $100 in cost: Do it, note it in your daily log, mention it to the client. “I moved the outlet like you asked, no charge on that one.”
- $100 to $500: Quick written confirmation via text or email. “It will add about $350. Want me to go ahead?” Save their written “yes.”
- Over $500: Full change order with pricing breakdown, timeline impact, and signature.
The key is consistency. If you give away the first five small changes for free, the client will expect the rest to be free too. Establish early that changes have a process.
Frequently Asked Questions
Price Change Orders on the Spot
When the client asks for something different mid-project, you need a number fast. SimplyWise generates cost estimates from photos in seconds so you can present the change order before leaving the job site.