Variation pricing calculator

How to Use This Calculator

Enter the additional labour, materials, plant, sub-subcontract and specific preliminaries costs. Use only the additions supported by the agreed pricing basis. Check how each percentage is applied: this tool adds overhead to direct cost, profit after overhead and risk after profit.

Worked Example

For example, £1,000 labour, £500 materials, £200 plant and £100 preliminaries total £1,800 of direct cost. A 10% overhead addition and then 5% profit produce £2,079 before VAT, with no risk addition.

Before You Use the Result

Keep the instruction, scope change, quantities and rate records beside the price. The tool’s percentage sequence is a build-up method; it does not replace the valuation rules in the applicable contract.

For a project that needs a wider review, explore QSEC variation and final-account support alongside The Subbie QS support.

Return to the full QS tools library for related calculators. You can also read about our variation and project support or use the free QS templates to organise the underlying records.

Use The Working Sheet For This Task

Give each change one reference. Track the instruction, notice, price, assessment and next action.

Download the Variation Register (Excel)

Track the event, notice, quotation, response and assessed value on the NEC route.

Download the NEC Compensation Event Register (Excel)

Each Excel link takes you to the matching sheet preview. Enter your work email to download, replace the example entries and start using the file on your job. Marketing is optional.