How Much to Charge for a Change Order (Don't Lowball)

Here's the quiet way change orders bleed a job dry: the client never argues, never refuses, never even blinks. You throw out a number in the hallway, they nod, and you go back to work feeling good about it. Three weeks later you're doing the math and realize that "quick add" cost you more than it paid. Knowing how much to charge for a change order isn't about squeezing the client — it's about not quietly handing them free work while you smile and lose money.

Lowballing a change order is the most expensive habit on most jobsites, precisely because it doesn't feel like a mistake when you do it. There's no blowup, no dispute, no lien. Just a slow leak in your margin that you don't notice until the job's closed out and the profit you expected isn't there.

What a Lowballed Change Order Actually Costs You

The damage from underpricing a change order doesn't stop at that one line item. It compounds three ways, and every one of them hurts more than the original shortfall.

You eat the real cost. Say you price a change at $600 because that "feels fair," but the burdened labor, materials, extra mobilization, and the inspection it triggered actually run $850. You just paid $250 to do more work. Do that four times on a job and you've wiped out the profit on the whole change-order line.

You reset the client's expectations. This is the killer. The first number you give teaches the client what changes "should" cost. Charge $600 for something worth $850 and the next time you quote fairly, you look like you're gouging them. You've trained your own client to expect the lowball, and every future change order gets negotiated down from a number that was already too low.

You lose the ability to say no. When your change orders barely cover cost, you can't afford to walk away from a bad one. You take on scope you don't want at prices that don't work because you've got nothing built in to absorb a mistake. A properly priced change order gives you room to breathe; a lowballed one puts a noose on the whole job.

The Bad Methods That Lead to Lowballing

Nobody sets out to undercharge. It happens because of how the number gets built. Here are the four habits that guarantee you leave money on the table, and what each one costs you.

1. Quoting raw labor instead of burdened labor

Your carpenter's wage is not what your carpenter costs you. Add payroll taxes, workers' comp, liability insurance, and the paid time he's not swinging a hammer, and the real number is often 40–60% higher than the hourly rate. Price a change at raw wage and you're subsidizing every hour. The cost: a hidden loss on every labor line, every single time.

2. Pricing only the task, not the ripple

A "small" change is rarely small once it hits the schedule. Moving one window means re-sequencing the framer, the electrician, and the drywaller, plus maybe a second inspection and another trip to the supplier. If you price only the visible task, all that ripple comes out of your pocket. The cost: the change order that looked profitable actually dragged the rest of the trades sideways for free.

3. Guilt-pricing when the client winces

The homeowner makes a face, and you instinctively shave the markup to keep the peace. Now the change covers cost — maybe — and contributes nothing to overhead or profit. The cost: you did real work, took real risk, and your business got nothing for it. You'd have been better off not doing the change at all.

4. Winging it from memory

Pricing a change from your gut, standing in a half-framed hallway with everyone waiting, is how numbers get missed. No line items, no markup applied on purpose, no record of how you got there. The cost: you can't defend the number when it's questioned, and you can't spot the leak later because you never wrote down where the money went.

How to Charge for a Change Order the Right Way

The fix isn't complicated. Build the full cost stack, apply a markup you can defend, and put it in writing before the work starts. Here's the order of operations for figuring out how much to charge for a change order without leaving margin on the table.

1. Add up burdened labor. Hours × your fully-loaded labor rate, not the raw wage. Include the ripple hours on other trades.
2. Add materials at your real cost — including delivery, waste, and any restocking on what the change makes obsolete.
3. Add job-level costs the change triggers: extra mobilization, equipment, permits, or inspections.
4. Apply your markup on the whole stack — a percentage that covers overhead and leaves profit. This is the number most people skip. Cost without markup is not a price.
5. Round up, not down. When you're unsure, the honest error is to charge slightly more, not less. You can always credit the client back; you can rarely claw money back after the fact.

The point of a written change order isn't paperwork for its own sake — it's that a number on paper, with line items, is a number you can defend and a number the client actually signs. A verbal "yeah, about six hundred" is how the leak starts. If you want a deeper breakdown of the math, see our guide on how to price a change order so you actually get paid.

There are two free ways to lock this in, and honestly it just depends on how you like to work.

If you think in spreadsheets, grab the free Excel change order template. It's built to force the full cost stack — you plug in your line items, markup and tax, and it works out the total and your revised contract value automatically, so you can't accidentally forget the markup. There's a log tab too, so every change on the job is tracked in one place. Download the free change order spreadsheet and use it on any project.

If you'd rather not touch a spreadsheet at all, the free ChangeOrdersPro tool does the same math on your phone. You fill in the change, it applies your markup and updates the contract total, and the client signs from their phone in about 30 seconds — so there's no gap between agreeing on a number and getting it in writing. That signed record is what protects the price you just worked out. You can create a change order for free without setting anything up.

Both are genuinely free, and both do the one thing that stops lowballing: they make you build the real number instead of guessing it. If you're wondering how a tool like this stays free, we explain that on our pricing page. And if you want more on the paperwork side of running a profitable job, the ChangeOrdersPro blog has guides on writing, sending, and getting change orders signed.

A Quick Gut-Check Before You Send Any Change Order

Before the number leaves your mouth or your phone, run it past this short list:

• Did I use burdened labor, not raw wage?
• Did I count the ripple on other trades and the schedule?
• Did I add materials at true cost, including waste and delivery?
• Did I apply markup on top of cost — on purpose?
• Is it in writing, with line items, ready for a signature?

If you can answer yes to all five, you're not lowballing. If you can't, you're probably about to hand the client free work.

Frequently asked questions

What percentage should I charge on a change order?

There's no single legal or industry-mandated percentage — it depends on your overhead and the trade. The important thing is that your markup is applied on top of your full cost (burdened labor plus materials plus job-level costs) and that it covers overhead and leaves profit. Whatever percentage you'd need on the base contract to stay profitable is a reasonable starting point for change orders too. Set it deliberately, not by whatever keeps the client from wincing.

Should a change order cost more per hour than the original contract?

Often, yes, and that's fair. Change orders come mid-job, out of sequence, frequently with rush pressure and extra mobilization. They disrupt a schedule you already planned around. Pricing them at a slightly higher effective rate than base contract work reflects real added cost and risk — it isn't gouging.

Is it better to price a change order as a lump sum or time and materials?

Both work when done right. A lump sum gives the client certainty and rewards you for efficiency, but only if you've built the full cost stack first — a lowballed lump sum is where people get burned. Time and materials protects you when the scope is genuinely unclear, as long as you track and document hours and materials carefully. Pick based on how well you can predict the work.

Is the free Excel change order template good enough to price a change order?

Yes. The free Excel change order template is built to force the full cost stack — line items, markup, tax and revised contract value all calculated for you — which is exactly what stops lowballing. If you'd rather price and get it signed from your phone, the free ChangeOrdersPro tool does the same math digitally. Use whichever fits how you work.

Daisy Porter

Co-Founder, ChangeOrdersPro

Daisy writes about the unglamorous side of running a build — the paperwork, the change orders, and the conversations that keep a job profitable. ChangeOrdersPro is the free tool her team built so contractors can send a professional change order and get it signed from a phone in about 30 seconds.