How to Price a Building Job in the UK

Pricing a building job starts with working out what it will actually cost to complete. Measure the work, price the materials, estimate the labour hours and include subcontractors, plant and waste disposal. Then allow for business overheads and specific risks before adding enough profit to make the job worthwhile. Deal with VAT separately.

The temptation is to take a rough guess, check what competitors might charge and hope there is money left at the end. A more reliable approach is to build the price from the work itself. Here's how to do it, including a fully worked UK patio example.

1. Define exactly what you're pricing

Before calculating anything, establish what the customer is asking for and what you have agreed to supply. A price for 'lay a new patio' could mean laying slabs on an existing sound base, or digging out the whole area, removing the spoil and building it from scratch. Those are very different jobs.

For each job, record:

• Dimensions and quantities: measured areas, lengths, depths and any drawings.
• Specification: materials, finishes, preparation and installation requirements.
• Site conditions: access for deliveries and machinery, parking, storage and protection of existing surfaces.
• Responsibilities: who is supplying materials, obtaining necessary approvals or arranging specialist work.
• Assumptions and exclusions: anything not yet confirmed, and work that is specifically outside the price.

On a visit, check the things drawings cannot tell you: whether a mini digger can get through the gate, how far materials must be carried and where waste will go. Don't quietly assume difficult ground or poor access will somehow work itself out.

Where a major unknown could change the scope substantially, investigate it or agree a clear method for pricing that work. An internal contingency is not a substitute for defining the job.

2. Calculate labour costs, not just the hours on site

Break the job into tasks and estimate person-hours, rather than simply counting calendar days. Two people working for three eight-hour days represent 48 person-hours, not 24.

Allow time for preparation, setting out, collecting or moving materials, the main work, clearing up and any necessary return visits. Your records from similar completed jobs are useful, but adjust them for the site and specification in front of you.

Work out a realistic internal hourly labour cost

An hourly wage is not always the full cost of providing labour. Depending on the business, that cost may also need to cover paid leave, employer costs and other employment-related expenses. A sole trader should allow a sensible cost for their own hands-on time instead of treating it as free labour.

An illustrative calculation might look like this:

The £42,000 and 1,400 hours are examples, not typical UK figures. Billable hours are lower than total working hours because holidays, training, estimating and other non-chargeable time take up part of the year.

Internal labour cost is not the same as the rate you quote a customer. In this example, the £30 is a cost figure only. We'll add overhead recovery, risk and profit later. If you already use a fully loaded charge-out rate that includes those elements, don't add them again.

For sole traders, our guide to how to calculate your day rate explains how to work from your ideal take-home pay, annual running costs and realistic billable days to a customer charge-out rate.

For specialist subcontractors, obtain a written price against a defined scope. Check what's included, whether there will be extra visits or certification, and how VAT is being treated.

3. Measure and price the materials

Start with the specification and calculate the required quantities. Then check current merchant prices rather than relying on what the materials cost last year.

For example, a rectangular patio measuring 5 m by 4 m has a finished area of 20 m². If you allow an illustrative 10% extra paving for cuts and breakage, the order quantity becomes:

20 m² × 1.10 = 22 m² of paving.

That 10% is an example, not a universal waste rule. The right allowance depends on the slab sizes, laying pattern, cuts, supplier packaging and material. Jewson's material calculators can help cross-check quantities, including paving, but the measurements and specification still need checking.

For a sub-base, calculate volume from area and compacted depth, then check the material density, compaction and supplier guidance. For instance, 20 m² × 0.10 m = 2 m³ compacted volume. At an illustrative compacted density of 2 tonnes per m³, that would be 4 tonnes. Actual order quantities depend on the material and site, so confirm them rather than relying on that assumption.

When checking each supplier price, look beyond the product itself. Include delivery, minimum orders, fixings, consumables, breakages and any charges for returning unused materials. Note whether the quote includes VAT, and check how long the price is valid.

4. Add site costs, overheads and contingency

These are three different things. Keeping them separate makes the pricing easier to understand and review.

Direct site costs

Plant and tool hire, skips, waste removal, deliveries, temporary protection and job-specific transport belong in the calculation when required. Check hire periods, collection charges, waste restrictions and any permits relevant to the site.

Larger jobs may also need allowances for supervision, welfare, temporary facilities, security or other site preliminaries. A small domestic job may need fewer of these, but it still needs a clear-up at the end.

Business overheads

Insurance, accountancy, subscriptions, office costs, general vehicle expenses and time spent running the business don't disappear when you're on site. They need to be recovered through the jobs you sell.

One approach is to divide annual overheads by the realistic billable hours across the whole team. For example, £17,500 of annual overheads ÷ 2,400 team billable hours = about £7.29 per person-hour. Applying the unrounded rate to 48 person-hours allocates £350 to the job, as in the patio example below. These are illustrative business figures, not recommended rates.

Another business might use a consistent percentage or project-specific allocation. There isn't one correct method for every contractor. What matters is that the total overhead budget is realistically recovered and that you don't count the same expense twice. If general van costs are already included in overheads, only charge additional job-specific vehicle costs separately.

Contingency for identifiable risks

Contingency is an allowance for uncertainty within the agreed scope, not a mysterious percentage added to every quote. Think about what could reasonably cost more: an extra waste load, additional handling time or a short extension to equipment hire.

Put a value against those risks, based on what is known about the job. If an unknown could require substantial new work, investigate it or agree how that work would be assessed and approved. A fixed-price customer quote doesn't automatically become more expensive because your own costs rise.

5. Add profit: understand markup versus margin

This is one of the easiest places to underprice work. Markup and profit margin are not interchangeable.

• Markup measures the intended surplus as a percentage of your pricing cost base.
• Margin measures that surplus as a percentage of the selling price, excluding VAT.

The formulas are:

• Markup (%) = surplus ÷ cost × 100
• Margin (%) = surplus ÷ selling price × 100
• Selling price for a target margin = cost ÷ (1 − target margin as a decimal)

Suppose the full pricing cost base is £100:

Both calculations are correct; they simply answer different questions. In this guide, the pricing cost base includes estimated direct costs, an overhead allocation and contingency. The margin applied to that base is therefore a target project surplus after those allowances, not a guarantee of business-wide net profit.

Gross profit is generally sales revenue less direct costs. Overheads still have to be covered before arriving at net profit. The final result also depends on actual spending, the company's full overheads and its accounting treatment. Choose your target based on the risks, work involved and needs of your own business, not an unsourced claim about what every builder should earn.

6. Handle VAT separately from your profit

If you're VAT registered, establish which purchases carry VAT and whether that input VAT is recoverable. Recoverable input VAT generally shouldn't be treated as a job cost; irrecoverable VAT should be. The VAT charged to the customer is not your profit.

Most work to existing buildings is standard-rated, but construction has important exceptions. Qualifying work may be reduced-rated or zero-rated, and the domestic reverse charge can apply to certain supplies between businesses in the construction supply chain. It is not the normal treatment for an ordinary patio supplied directly to a private homeowner.

Use HMRC's Buildings and construction VAT guidance to check the applicable rate, and its construction reverse charge guidance when supplying another business. Check uncertain circumstances with an accountant or HMRC before issuing the quote.

A business that is not VAT registered must not charge VAT. VAT paid on purchases will normally form part of its costs instead. At the time of writing, the UK VAT registration threshold is £90,000 of taxable turnover, with registration also required in certain forward-looking circumstances. See GOV.UK's VAT registration rules for the current tests.

7. Worked example: price a 20 m² domestic patio

Let's put the method together. This is a fictional example for teaching the calculation, not a typical UK patio price, a supplier quotation or a construction specification to copy.

The assumed job is a 5 m × 4 m patio at an accessible domestic property. The agreed scope includes lifting and removing the existing surface, excavation to the specified formation, a compacted sub-base, a mortar bed, laying and jointing paving, and leaving the site tidy. It assumes no drainage redesign, retaining structures, major ground problems or separate specialist work. Real depth, material and drainage requirements must be established for the actual site.

Step A: price the direct costs

The labour estimate is 48 person-hours: 4 for set-up and setting out, 10 for removal and excavation, 8 for the sub-base, 20 for laying, and 6 for jointing and clearing up. At the illustrative internal cost of £30 per hour, labour is £1,440.

The material quantities and unit prices below are also illustrative. Supplier pack sizes, actual coverage and site conditions must be checked before using any of them in a real quote.

For the paving, 22 m² includes the illustrative 10% waste allowance. The 4-tonne aggregate quantity and all product pack quantities are assumptions for this exercise, not confirmed ordering quantities. The labour figure values working time; it does not yet include the overhead or profit allocation.

Step B: include overheads and identified risk

Assume the business has allocated £350 of its wider running costs to this job. It also allows £250 for specific uncertainty, such as extra waste handling or a small extension to hire time. Those are internal pricing provisions, not separately agreed customer extras.

Step C: calculate the selling price and VAT

The business chooses an illustrative 20% target margin after those allowances. It must divide the cost base by 0.80, not simply add 20%:

£4,000 ÷ 0.80 = £5,000 selling price excluding VAT.

The planned surplus is £1,000. That's a 20% margin on £5,000, or a 25% markup on the £4,000 pricing cost base.

For this example only, assume the business is VAT registered, can recover the relevant input VAT and is supplying standard-rated patio work directly to a domestic customer:

The £1,000 of VAT is not an additional £1,000 of profit. Equally, the £1,000 planned surplus is not guaranteed take-home income. If costs overrun or overheads have been underestimated, the eventual return will be lower; if the contingency isn't needed, more may remain.

The customer quotation should describe the agreed work and selling prices clearly. You normally wouldn't give the customer your internal labour-cost calculations, allocated overheads or target profit. Our separate guide explains how to write a professional building quote once you've settled the price.

For a repair-specific example, see our guide on how to price a repointing job.

For a new-build masonry example, see our guide on how to quote for a brick garden wall.

8. Avoid common building-job pricing mistakes

Even a well-presented quote can lose money if the calculation behind it is weak. Before sending yours, check for these common mistakes:

• Underestimating labour: forgetting set-up, unloading, cleaning, collection trips and return visits.
• Pricing your own time at £0: making a sole trader's apparent profit depend on unpaid work.
• Missing small purchases: fixings, blades, protective sheets, mortar additives and delivery charges can add up.
• Double-counting costs: including van expenses in overheads and then adding the whole amount again as a job cost.
• Confusing markup with margin: adding 20% to costs when you actually wanted a 20% margin.
• Copying competitors: their staffing, equipment, access and overheads may be different from yours.
• Ignoring cash flow: having enough theoretical profit doesn't help if large purchases are due before customer payments.

Once a job finishes, compare estimated versus actual labour hours, materials, waste, hire periods and subcontractor costs. If you estimated 48 labour hours but used 63, find out why and use that lesson on the next comparable project. Review whether your overhead allocations recovered the wider costs of running the business, too.

Where the customer requests changes, describe the additional or altered work and agree the price or pricing method before it proceeds. Keep that separate from your internal contingency. A clear scope and a record of agreed variations protect both sides.

Price building jobs with confidence

Good pricing isn't about finding a magic hourly rate or copying a competitor's total. It's about knowing the scope, working through the costs and choosing a selling price that can sustain your business. Keep your assumptions, then learn from what each completed job actually costs.

Once you've calculated the price, Quote Forge can help you organise the customer-facing line items, calculate quote totals and VAT, save the quotation and produce a professional PDF. It's a quoting tool, not an automatic estimator of your labour costs, overheads or profit margin.

Frequently asked questions

How do I price a small building job without previous records?

Start with a measured scope and break the work into individual tasks. Estimate the hours, get current material and hire prices, include overheads and a sensible allowance for identified risks, then add your chosen profit. Record the actual costs when the job is finished so the next estimate has a stronger starting point.

How much profit should I add to a building job?

There is no reliable universal percentage. Your target depends on business overheads, risk, the job's complexity and the return you need. Make sure you understand whether the number you're using is a markup on costs or a margin on selling price; the 20% margin in the patio example is illustrative, not a recommended industry standard.

Should I mark up materials and subcontractor costs?

Your selling price needs to cover the cost and responsibility of supplying materials and managing subcontractors, as well as overheads and profit. A markup on those items can be one way to recover that, but check the margin across the whole job and avoid adding the same allowance twice.