Change Order Pricing Calculator

Change orders are where good jobs become great jobs (or disasters)

Every job of any size ends up with changes — customer adds a scope, conditions change, specs evolve. Handled well, change orders are the most profitable work you do: you already have the crew on site, tools in hand, staging built, and the customer captive. Handled badly, change orders become the thing that turns a profitable base contract into a break-even nightmare.

The difference is almost entirely in pricing discipline and paperwork. This calculator tackles the pricing half.

The change order cost buckets

• Direct labor — Hours × burdened rate for the change work itself.
• Direct material — Material cost delivered, at the price you'll actually pay (including any expedite fees if this is a mid-job order).
• Equipment — If the change requires equipment you don't already have on site (an extra lift day, a saw rental, etc.).
• Subcontractor cost — If the change involves a trade you subbed out, the sub's added cost.
• Disruption cost — The non-productive labor the change causes: re-sequencing, waiting on material, pulling the crew off other work, crew meetings to re-plan. This is real money most contractors leave out of change orders entirely.
• Supervision — The PM, foreman, or owner time spent scoping, ordering, coordinating, and tracking the change.
• Profit margin — Applied on top as margin (not markup) once the costs-plus-markups are totaled.

Markup tiers for change orders

Default suggested tiers (you can adjust per job type and market):

• Labor: 30-40% markup
• Material: 25-35% markup
• Equipment: 15-25% markup
• Subcontractor: 15-25% markup
• Supervision adder: 10-15% of marked-up subtotal
• Profit margin on top: 8-15%

These are consistently higher than base-contract markups because change orders are smaller, disruptive, and carry less leverage on material purchasing. The customer is already committed — your price is the price they pay if they want the change. Don't leave money on the table.

A worked example

Customer mid-remodel asks to add a can light and switch loop. Labor: 2 hours × $40 = $80. Material: $35 wire, $45 fixture, $18 box + misc = $98. No equipment, no sub.

Direct cost: $178. Add 35% labor markup ($28), 30% material markup ($29.40). Marked-up cost: $235.40. Disruption: 30 minutes of coordination/re-staging at $40 = $20. Supervision at 10% = $23.54. Profit margin 10%: final price ≈ $310. Not $178. That $132 gap is where change-order margin lives.

Paperwork discipline — the non-negotiable

Before any change order work starts: written scope, written price, signature from the customer. No exceptions, not even for “trusted” customers or “small” changes. The minute you start work on a verbal change order, you've given the customer leverage to negotiate the price after the work is done — and that negotiation always goes against you.

A single-page change order form with scope description, line items, total, customer signature, and “no work begins until signed” in the fine print is worth tens of thousands of dollars a year. Every mature contracting business has one. If you don't, build one this week.

When to walk from a change order

Three reasons to walk: (1) customer refuses to sign before work starts, (2) customer demands markup cuts below your break-even, (3) customer wants the change quietly absorbed into base contract scope. Each of these is a signal the relationship is adversarial and your margin will continue to erode across the rest of the job. Walking isn't rude — it's basic financial discipline.