How Change Orders Actually Work

Almost every remodel of any size generates at least one change order. Most homeowners have never seen one until it lands mid-project, usually attached to a number they didn't expect and a signature line they feel pressured to sign. This article explains what a change order actually is, what legitimately triggers one, what should never trigger one, and how to keep them from quietly rewriting your budget. By the end you'll know how to read a change order and what to ask before signing it.

What a change order actually is

A change order is a written amendment to your construction contract. It documents three things: what is changing in the scope of work, what it does to the price, and what it does to the schedule. Signed by both sides, it becomes part of the contract with the same force as the original document.

That last part matters more than most homeowners realize. The change order is not a courtesy memo or a heads-up. It is the mechanism that keeps the contract honest when reality departs from the plan, and on a remodel, reality always departs from the plan somewhere.

A verbal agreement to "just take care of it" is not a change order. Work performed without a signed change order is where most billing disputes are born, because six weeks later nobody remembers agreeing to the same thing.

What legitimately triggers a change order

Three categories cover nearly all of them.

Concealed conditions. The wall gets opened and there is knob-and-tube wiring, or a rotted sill plate, or a vent stack where the plans assumed empty cavity. Nobody could have priced this from the outside, and the contract almost certainly has a clause covering exactly this situation. In older housing stock, concealed-condition change orders are close to routine, and a competent contractor prices the original bid knowing they are possible rather than pretending the house holds no surprises.

Owner-requested changes. You saw the framed opening and decided the doorway should be wider. You picked a different tile after the original was ordered. These are legitimate, and they cost what they cost. The discipline is on your side of the table: every "while you're at it" adds money and days, and they compound faster than people expect.

Code and inspection requirements. An inspector requires something the plans didn't show, or a code interpretation goes against the assumption in the bid. This is real and unavoidable, though a contractor who works in your jurisdiction regularly should be catching most code implications at bid time, not discovering them at inspection.

What should not trigger a change order

This is the part worth reading twice, because change orders are also where underbidding gets laundered.

Work that was clearly in the original scope should never come back as a change order. If the contract says "install tile floor" and the change order says "floor prep," ask why prep wasn't part of installing a floor. Estimating errors are the contractor's to absorb. If they forgot to include the second coat of paint or under-counted the windows, that is not a changed condition, that is their bid.

The pattern to watch for is a suspiciously low original bid followed by a stream of small change orders. Some contractors win work by bidding thin and making margin on changes. A bid that came in well under the others and then generates a change order every week is not bad luck. It is a business model.

What a change order should cost

There is no universal number, but there is a structure. A legitimate change order prices the direct cost of the work, plus the contractor's standard markup for overhead and profit, which typically runs 10% to 20% on change-order work. The markup should be stated in your original contract, not invented at change time.

Two things are worth negotiating before the project starts, while you still have leverage. First, that markup percentage on changes is written into the contract. Second, a rule that no change work proceeds without your signature on a priced change order. Both of these are standard, and a contractor who resists either is telling you something.

As a budget matter, carry a contingency of 10% to 15% of project cost for a typical remodel, and closer to 20% on older homes where concealed conditions are more likely than not. The contingency is not pessimism. It is the honest price of not being able to see inside walls.

Common mistakes homeowners make

The most expensive mistake is approving changes verbally. The second is signing change orders without a price on them, "we'll figure out the cost later" converts your leverage into an invoice. The third is treating the contingency as spending money for upgrades early in the project, then having nothing left when the concealed condition shows up in month two. And the quietest one: not asking how the change affects the schedule, because a $900 change that adds two weeks may cost far more than the paper price.

What this means for your project

Before you sign a construction contract, read the change-order clause. It should require written, priced, signed change orders before work proceeds, and it should state the markup applied to change work. During the project, keep a simple running log of signed change orders and their totals, because individually reasonable numbers accumulate into real money, and you want to see the total moving, not discover it at the end.

When a change order lands, the three questions to ask are: why is this outside the original scope, what happens to the schedule, and is there a cheaper way to solve the same problem. A good contractor has answers to all three without friction, and the conversation takes five minutes.

Change orders are not a sign a project is going badly. A remodel with zero change orders usually means the scope was vague enough to absorb everything, which is worse. What you want is not the absence of changes but the discipline around them, priced, written, signed, and visible. If you're still choosing a contractor, it's worth understanding the warning signs that a contractor will cost you before the contract is signed, because the change-order behavior is set by who you hire, not by the paperwork.