How to price a construction job (UK)

Published on 10 July 2026

In short: a sound price is built up, not guessed. You measure the quantities, put a rate against each one for materials and labour, add the project-wide costs (preliminaries), then apply overheads, profit and a contingency. Do it in that order and the number you hand over is one you can stand behind and defend.

Step 1: measure the quantities

Everything starts with an accurate takeoff. Measure the lengths, areas, volumes and counts off the drawings so you know exactly how much of everything the job needs. If the quantities are wrong here, no amount of clever pricing later will save the number. This is the foundation, so it is worth getting right.

Step 2: price the materials

Put a current rate against each measured quantity. Ring your merchant or check live prices rather than reaching for last month's invoice, because material prices move. Add a realistic waste allowance to the net quantity, and round up to whole packs, sheets or loads where that is how you buy.

Step 3: price the labour

For each element, work out the labour time from a production rate (for example, an assumed output per square metre of plasterboard, or per metre of skirting), then apply your labour cost for that trade. Labour is where estimates most often drift, so lean on your own recorded outputs from past jobs rather than optimistic guesses.

Step 4: add the preliminaries

Preliminaries are the project-wide costs that are not tied to a single measured item: scaffold, skips, plant hire, welfare, site management, temporary works and access. Price these as real costs, not a token percentage. On a smaller job they can be a meaningful share of the total, and leaving them thin is a common way to lose money.

Step 5: apply overheads and profit

Overheads are the cost of running your business (office, insurance, vehicles, admin) spread across your work. Profit is your margin on top. Set both as a clear percentage on the priced cost so you know exactly what you are carrying, and so you can flex it deliberately when a job is more or less competitive.

Step 6: add a contingency

Build in an allowance for the things you cannot see on the drawings: difficult access, unknowns below ground, complex details, or risk you are being asked to carry. A named contingency is far better than padding rates quietly, because you can see it, explain it, and take it out if the job firms up.

Common mistakes to avoid

• Pricing from stale material costs.
• Underpricing labour by trusting optimistic outputs over recorded ones.
• Treating preliminaries as an afterthought.
• Burying profit and contingency inside rates so you cannot see them.
• Not stating clearly what is, and is not, included in the price.

Where a takeoff tool helps

Most pricing errors trace back to the quantities, and to the slow, manual handover between measuring and pricing. Kestrel™ is built by a working UK estimating firm to close that gap: you measure straight on the PDF and export an NRM2 Bill of Quantities in Excel with quantities, descriptions and live formulas already in place, so you move straight to putting your rates in and the totals update as you go. It runs on Windows with a 14-day free trial. Download Kestrel to try it on a real drawing.