Contractor Change Order Cost Calculator
Change orders can quickly add up during a renovation or build. Enter the extra labor hours, materials cost, contractor markup, and expected delay to see the true added cost and revised timeline.
About this calculator
Estimate the added cost and revised project timeline impact of a construction change order, including labor, materials, markup, and delay days.
Frequently Asked Questions
What is a typical contractor markup on change orders?
Markups on change order labor and materials commonly range from 10% to 20%, covering overhead, coordination, and profit for the extra work.
Why does a change order affect the timeline?
Extra work often requires ordering new materials, rescheduling subcontractors, or re-sequencing tasks, which can push back the overall project completion date.
Should I get change orders in writing?
Yes, always request a written change order documenting scope, cost, and schedule impact before work begins to avoid disputes later.