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Change Order Cost Calculator
A mid-project change order costs 30-100% more than the same work quoted upfront. Contractors price in disruption, re-coordination, schedule risk, and margin uplift. This calculator sizes the true cost of a change order so you can decide whether the change is worth it — or if it can wait for a future project.
Total change order cost
$6,006
Premium vs upfront price
$2,606
Premium %
76.6%
Labor + materials base
$3,760
Contractor markup
$1,316
Delay carry cost
$580
Labor total
$1,360
How the math works
Mid-project changes compound cost at every layer: raw labor + materials, contractor markup (25-50%), delay carry cost (your money loses time), plus a schedule-impact fee. A change that would've cost $3,400 upfront typically balloons to $5,000-$6,500 mid-project — 40-80% premium.
If the change premium is > 50%, delay the work: complete the project, then do the change as a second job after handoff. You lose the efficiency of crews already on-site but gain negotiating leverage and avoid the markup stack.
How to Use
- Enter the material cost of the change and labor hours needed.
- Enter the contractor's change-order markup % (typically 25-50%).
- Add delay days cost and schedule-impact fee.
- See total cost and how it compares to doing the work upfront.
Frequently Asked Questions
Why are change orders so expensive?
Coordination disruption (sub rescheduling), re-permitting if scope expands, interruption of crew flow, and psychological pricing — contractors know you're already committed and margin-price accordingly. Write-up admin time is also non-trivial: a $500 change might require $200 of admin paperwork.
Can I negotiate change order pricing?
Sometimes — especially if you have a trust relationship with the GC and the change is simple. Asking 'can we do time-and-materials instead of fixed price on this one?' often cuts cost 15-25% on small changes. Major changes should stay fixed-price — T&M blowouts are common.
What's a delay day cost?
Your carrying cost + missed rent or closing. On a rehab held at 10% interest with $200K average balance and $2,500/mo prospective rent: each delay day costs about $138. Seven delay days = $966. That's why 'quick' change orders often cost more in delay than in direct work.
Should I put change-order language in the original contract?
Yes. Specify max markup (e.g., 25%), require written approval before work starts, and cap schedule-impact fees. Without this, a mid-project dispute over change pricing can derail the whole project. Include 'no-cost change orders' for scope-neutral swaps.
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