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What Is a Change Order in Construction?

Change orders are how a project's scope and price change in writing — here is how they work and how to avoid surprise costs.

By RenovateRadar ·

A change order is a written agreement that modifies the original construction contract — adding, removing, or altering work, and adjusting the price and schedule to match. It is the mechanism that keeps a project honest when reality differs from the plan.

Why change orders happen

  • The homeowner requests an upgrade or a scope change.
  • Hidden conditions surface after demolition (rot, old wiring, code issues).
  • A design detail or material selection changes.

What a proper change order includes

A clean change order states the change, its cost (or credit), any schedule impact, and requires sign-off from both parties before the work proceeds. The original contract value is never quietly rewritten — the adjustment is documented so everyone can see how the total moved.

How to avoid surprise change orders

Start with a detailed scope and realistic allowances, and insist that no extra work begins without an approved change order. A contractor who documents changes properly is protecting you as much as themselves.

Frequently asked questions

Do I have to sign a change order?
You should never feel obligated to sign, but work outside the original contract generally should not proceed until a change order is agreed. Signing protects both sides by fixing the new price and scope in writing.
Can a contractor charge for work without a change order?
Reputable contractors get written approval before doing extra work. Charges for unapproved work are a common source of disputes — which is exactly why the change-order process exists.

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