Change order calculator
Added work should carry the same margin as the rest of your job. Enter the cost of the change and your target margin to get the price to put on the change order — before the work happens.
This calculator is an educational tool. Results are estimates from the numbers you enter — your real costs and obligations vary.
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The Contractor Authority System™ turns this into a repeatable process — burdened labor & overhead, change-order protection, and client-ready proposals. One-time $97.
FAQ
Because billing added work at cost means you do it for free in margin terms. A change order should carry your normal margin, or every surprise quietly erodes the job's profit.
Yes — price it and get a signature before the work happens. A written, signed change order is what turns added work from a free favor into paid work.