Change Orders: What They Are and How to Stop Them From Wrecking Your Budget

A change order is a written amendment to your construction contract that alters the scope, cost, or schedule of a project after work has already started. It might add a bathroom your original plans didn’t include, swap granite countertops for quartz, or account for rotted framing found once the drywall came down. Every legitimate change order has three parts: a description of the change, the price adjustment, and any effect on the completion date. If a request is missing any of those three pieces, it’s not a real change order yet, it’s just a conversation.

Homeowners often assume change orders are a sign something went wrong. Sometimes they are. But plenty of change orders are normal and even healthy, because no set of drawings, however detailed, can predict every condition behind a wall or under a slab. The problem isn’t that change orders exist. The problem is when nobody controls how they get requested, priced, and approved.

Why Change Orders Happen

Most change orders fall into a handful of categories:

Hidden conditions:æ°´damage, outdated wiring, foundation cracks, or plumbing that doesn’t match the as-built drawings.
Owner-driven changes: a homeowner decides mid-project to move a doorway, upgrade fixtures, or add square footage.
Design errors or omissions: the architect’s plans conflict with each other, or a detail was left out entirely.
Code requirements: an inspector flags something during a walkthrough that has to be corrected to pass inspection.
Material substitutions: the specified tile is discontinued, or a supplier quotes a 14-week lead time on a light fixture that was supposed to ship in two.

On a typical residential remodel, contractors report change orders adding anywhere from 5% to 15% to the original contract price. On older homes or projects involving structural work, that number climbs higher, sometimes past 25%, simply because more gets discovered once walls open up.

The Real Cost of an Unmanaged Change Order

The dollar amount on the change order form is rarely the whole story. A $2,400 change to relocate a sink line can also push the plumber’s schedule back a week, which delays the drywall crew, which delays the painter, which delays your move-in date by three weeks total. Contractors sometimes fold that scheduling impact into the price, and sometimes they don’t, which is exactly why the paperwork matters.

There’s also a compounding effect. On a $150,000 renovation, five change orders averaging $3,000 each don’t just add $15,000. They also usually add administrative time, extra site visits, and delays that push the project into a slower season for subcontractor availability, which can raise labor rates on whatever comes next. A homeowner who approves changes verbally, without seeing updated numbers in writing, often doesn’t realize the total impact until the final invoice arrives.

Contract Language That Prevents Most Problems

The best time to control change orders is before the first shovel hits the ground. Your contract should specify:

A fixed markup percentage on change order labor and materials (commonly 10% to 20%), so pricing doesn’t get negotiated fresh every time.
A requirement that all change orders be submitted in writing and signed by both parties before work proceeds, with no exceptions for “small” changes.
A defined allowance schedule for items not yet selected, such as $8 per square foot for tile or $1,500 for a light fixture package, so upgrades beyond that number are clearly change orders and not disputes.
A contingency line, typically 10% to 15% of the total contract on a remodel, built into the budget from day one specifically to absorb hidden-condition surprises.
A stated turnaround time, such as 3 business days, for the contractor to price a requested change and for the owner to approve or reject it.

A contract with vague scope language, like “renovate kitchen per owner’s wishes,” almost guarantees disputes later, because there’s no baseline to measure a change against. The more specific the original scope of work, the fewer arguments about what counts as “extra.”

How to Handle a Change Order Request When It Comes In

When your contractor presents a change order, slow down before signing. Ask for the breakdown: labor hours, material cost, markup percentage, and whether the schedule shifts. Compare the markup against what’s stated in your original contract. If your contract caps markup at 15% and the change order shows 30%, that’s worth a direct conversation before anything else happens.

Keep a running log of every change order alongside your original budget, updated after each approval, not at the end of the project. A simple spreadsheet with columns for date, description, cost, cumulative total, and running percentage over original budget takes ten minutes to set up and can catch a budget overrun while there’s still time to cut something else to compensate.

If a change order is driven by a hidden condition rather than a preference, ask your contractor whether the fix has options at different price points. Rotted subfloor might need full replacement in one section but only sistering in another. A contractor who’s willing to walk through alternatives, rather than presenting a single take-it-or-leave-it number, is usually one who’s pricing fairly.

Watch for Change Order Padding

Occasionally a contractor uses change orders to recover margin lost from underbidding the original job. Warning signs include change orders that arrive with no itemized breakdown, requests for large sums to fix problems that should have been visible during the initial walkthrough, or a pattern of change orders appearing right after the contract is signed but before real hidden conditions could plausibly have been discovered. Asking for photos of the actual condition (a rotted joist, cracked pipe, or undersized panel) before approving payment is a reasonable request, and a contractor with nothing to hide will provide them without pushback.

Before your next project starts, sit down with your contractor and put a specific change order process in writing, including markup percentage, approval turnaround time, and contingency amount, even if your existing contract is silent on these points. A one-page addendum signed by both parties now can save thousands of dollars and weeks of frustration later.