Change order markup calculator
Prices a change order the way the contract does — extra quantity at the agreed unit price, changed work at cost plus overhead and profit — and shows the days it adds.
Price the change order
Every field starts filled, so a figure is on screen before you type. Change a value and the result and every intermediate step follow it.
Change order = quantity part + direct cost raised by job overhead, home office overhead and profit. The quantity part is what the measured quantity bills, minus contract quantity times contract unit price.
Change order amount and time extension
Change order, net: $20,650.00
Contract quantity at the contract rate: 500.00 × $42.00 = $21,000.00
Quantity at the new rate: 140.00 × $36.50 = $5,110.00
Measured quantity billed: $26,110.00
Quantity part of the change order: $5,110.00
Direct cost, self-performed: $8,400.00
Self-performed work with the total markup: $8,400.00 + 20% = $10,080.00
Subcontracted work with its markup: $5,200.00 + 5% = $5,460.00
Changed and additional work priced: $15,540.00
Sales tax: 0% = $0.00
Change order including tax: $20,650.00
Contract sum after the change, net: $440,650.00
Share of the contract sum: 4.92%
Added effort in working days: 7
Time extension in calendar days: 10
Contract period after the change, in calendar days: 190
Share of the contract period: 5.56%
Every unit past the contract quantity bills at the new rate, and a shortfall simply bills less. No compensation is calculated.
One line item is priced here. A change order across several items is calculated line by line and then totaled.
Questions about Change order markup calculator
What is a normal markup on a change order?
Ten percent overhead and ten percent profit is the figure most contracts name, and public work often caps the subcontracted portion lower, around five percent. It is a contract term, not a standard rate. Read the clause before you price the change, because the cap usually applies per tier.
Is overhead and profit compounded or added?
Both are used. Adding them gives twenty percent on ten and ten; compounding profit onto cost plus overhead gives twenty-one. On a change worth forty thousand dollars in direct cost that difference is four hundred dollars. The calculator switches between the two so you can price the way your contract reads.
Does a change order automatically extend the completion date?
No. Most contracts require the extension to be claimed in the change order itself, in writing, within a notice period. A change order signed for money alone leaves the original date in force, and liquidated damages then run against work the owner asked for.
Use the calculation with your own project data
Request a trial period and tell us which workflow you want to test. We prepare Home Builder Software around that part of your work without fixing a term before we know the scope.