Site preliminaries calculator

How to Use This Calculator

Enter the delay duration and the weekly costs that are genuinely time-related. Add one-off delay costs separately, deduct mitigation credits and use the overhead and profit percentage appropriate to the proposed build-up. Keep each cost linked to the event and the period claimed.

Worked Example

Two weeks at £1,000 management and £200 welfare per week give £2,400. Adding £100 of one-off cost and deducting £50 of credits produces £2,450 before overhead and profit. A 10% addition gives £2,695.

Before You Use the Result

A time-related cost calculation does not prove responsibility for delay or entitlement to recovery. Retain the programme, chronology, invoices and records needed to explain why the cost arose.

For a project that needs a wider review, explore QSEC programme and delay analysis alongside The Subbie QS support.

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

Use The Working Sheet For This Task

Record extra work, labour, materials, plant and supporting references while the facts are fresh.

Download the Daywork & Site Record Sheet (Excel)

Record the notice dates, owner, service route and proof required by your signed subcontract.

Download the Notice & Deadline 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.