In our analysis of hundreds of renovation projects, change orders were the single biggest driver of final costs exceeding budgets. Not material price increases. Not contractor mistakes. Change orders — scope additions, design revisions, and unforeseen conditions that get added to the bill one item at a time.
What Is a Change Order?
A change order is any modification to the original scope of work after a contract is signed. They can be initiated by you (design change, upgrade), your contractor (unforeseen condition, code requirement), or an outside party (architect, inspector). All three types are legitimate, but all three need to be documented and signed before work begins.
The Verbal Change Order Trap
The most dangerous change order is the one that was never written down. A homeowner tells their contractor "while you're at it, can you move that outlet?" — a casual five-second conversation that turns into a $600 charge they never approved in writing. Establish a rule from day one: no change order is authorized unless it's in writing with a price, signed by both parties.
When Change Orders Are Legitimate
- Unforeseen structural issues: Hidden rot, out-of-square walls, or plumbing that wasn't in the plan.
- Code compliance: An inspector requires work that wasn't in the original scope.
- Owner-requested upgrades: You decide to upgrade countertops or add a second vanity.
- Design changes: Your architect revises plans after work has started.
When to Push Back
Contractors sometimes use change orders to recover margin lost on a low bid. Watch for change orders that cover work that should have been included in the original scope, arrive without supporting documentation or photos, or are submitted verbally rather than in writing.
Build a 10% Change Order Contingency
Any experienced renovation pro will tell you: budget 10% of your total contract as a change order contingency. Don't allocate it elsewhere. If you don't use it, great. If you do, you're prepared.
RenoSpend tracks every change order, links them to your budget categories, and keeps a running tally of how much your original scope has grown.
