How to Quote for Building Work: Complete Guide for UK Builders

Quoting for building work is a skill that separates successful builders from those who are always busy but never making money. Get your quoting right and you win profitable work from customers who trust you. Get it wrong and you either lose jobs to competitors who present better, or win them at prices that leave you working for nothing.

This guide walks through the entire quoting process for building work in the UK, from the initial site survey through to presenting a professional proposal that wins the job. We include real pricing examples so you can benchmark against current market rates.

Step 1: Survey and Measure Up Properly

Every accurate quote starts with a proper site survey. Builders who skip this step or rush through it end up with quotes that are either too high (and lose the work) or too low (and lose money on the job).

What to measure

Take measurements of every area you will be working in. For an extension, that means the footprint, ceiling heights, window and door openings, and existing drainage and service positions. For renovation work, measure the rooms being affected, wall thicknesses, floor to ceiling heights, and any structural elements.

Bring a laser measure - they are accurate, fast, and cost under £30. Take photos of everything. You will refer back to these when pricing the job, and your memory of site visits blurs after a few days.

What to check for

Look for anything that could increase the cost or complexity of the work:

• Access issues - narrow driveways, limited space for scaffolding or skip placement, overhead cables
• Ground conditions - sloping sites, clay soil (deeper foundations needed), high water table
• Existing structure - signs of movement, damp, asbestos in older properties (pre-2000), the condition of existing walls and floors you will be connecting to
• Services - where the gas, electric, water and drainage run, whether they need relocating
• Neighbours - Party Wall Act implications, shared boundaries, access requirements

What to ask the customer

Before you leave site, make sure you understand exactly what the customer wants. Ask about finishes (budget, mid-range or premium), fixtures and fittings (are they supplying anything themselves), timeline expectations, whether they have planning permission and building regulations approval (or need help obtaining it), and whether they have had other quotes.

Step 2: Calculate Material Costs

Once you have your measurements, work out exactly what materials you need. Do not guess. Get actual prices from your merchants, because builder's merchant prices vary significantly.

Real pricing example: Single-storey rear extension (4m x 5m)

Here is a realistic material cost breakdown for a typical single-storey rear extension in 2026:

These are 2026 prices for the Midlands region. London and the South East will be 10-20% higher. Scotland and the North may be 5-10% lower. Always get actual merchant quotes for your area rather than relying on estimates. Use our material cost estimator to help total up your figures.

Always add a waste factor

Materials get damaged, cut offs cannot always be reused, and you will inevitably need a few more than you calculated. Add 10-15% for general materials (bricks, blocks, timber, plasterboard). Add 5-10% for expensive items (tiles, windows, sanitaryware). This is not padding your quote. It is realistic accounting for how building work actually goes.

Step 3: Calculate Labour Costs

Labour is typically 40-50% of the total cost of building work. Getting this right requires honest assessment of how long the job will actually take, not how long you hope it will take.

Current UK builder day rates (2026)

For more detail on current rates, see our builder's day rate guide and our UK tradesperson rates for 2026. You can also calculate your ideal rate using our day rate calculator.

Labour example: The same 4m x 5m extension

Step 4: Add Your Markup and Profit

Your quote needs to cover more than just the direct costs of this job. It needs to contribute to your overheads and include a profit margin. Many builders skip this step and wonder why they are always busy but never have any money.

What your markup covers

• Overheads - van costs, insurance (public liability, employers liability, professional indemnity), tool replacement, phone, accountancy, marketing, office costs. For most sole trader builders, overheads run £500-1,500/month.
• Materials markup - 15-25% on materials to cover sourcing time, storage, collection runs and the risk of price changes between quoting and purchasing.
• Profit - the money you actually keep after all costs. A healthy net profit margin for building work is 10-20%. If you are not hitting at least 10%, you are effectively working as an employee without the benefits.

Putting it all together: Extension quote summary

This is a realistic price for a 4m x 5m single-storey rear extension in the Midlands in 2026, excluding decoration, kitchen fitting, flooring and landscaping. In London you would expect £50,000-60,000+ for the same work. For more on getting your pricing right, see our guide on how to price a job as a tradesperson and use our profit margin calculator.

Step 5: Present the Quote Professionally

You have done the hard work of calculating accurate costs. Now you need to present them in a way that wins the job. This is where many builders fall down - the numbers are right, but the presentation lets them down.

What your quote document should include

• Your business details - name, address, phone, email, insurance details, trade body memberships
• Customer details - name, property address, contact information
• Quote reference and date - unique reference number and date of issue
• Scope of work - a clear, detailed description of exactly what you will do, written in plain English the customer can understand. This is the most time-consuming part to write well. See our guide on how to write a scope of work.
• Itemised cost breakdown - broken down by phase or section so the customer can see where their money goes
• Total price - clearly stated with VAT shown separately if applicable. Use our VAT calculator to check your figures.
• Timeline - estimated start date and duration
• Payment terms - deposit amount, staged payment schedule, accepted methods
• Exclusions - everything not covered by this quote (planning fees, decoration, landscaping, etc.)
• Terms and conditions - see our guide on writing terms and conditions
• Validity period - typically 30 days

Format matters more than you think

A typed, branded PDF sent by email the same day as your site visit creates a completely different impression from a handwritten note sent a week later. The customer is about to spend tens of thousands of pounds. They want to see that you are organised, professional and reliable. Your quote is the first evidence they have of how you run your business.

Use your logo. Use clean formatting. Make the total price easy to find. Present it as a document you are proud of, not something you threw together in five minutes.

If formatting and writing the scope of work is what slows you down, tools like QuoteSmith handle this for you. You enter your costs and the AI generates a professional proposal document automatically. See what the output looks like on our examples page.

Step 6: Follow Up

Sending a quote and waiting passively for the customer to respond is one of the biggest mistakes builders make. Most customers get 2-3 quotes. The builder who follows up professionally is often the one who wins the work, even if their price is not the cheapest.

Follow up within 48 hours of sending the quote. A simple phone call or message: "Hi, just checking you received my quote for the extension. Happy to go through anything or answer any questions." That is it. No pressure, no hard sell.

If they have not decided after a week, follow up once more. After that, leave it. Pestering customers does not win work. For more detailed advice, see our guide on how to follow up on a quote.

Common Quoting Mistakes That Cost Builders Money

Having quoted building work for years, these are the mistakes we see repeatedly:

Quoting by text message. "Yeah the extension will be about 35k." This is not a quote. It is a guess with no detail, no terms, and no protection for you. When something goes wrong, and something always goes wrong, you have nothing to refer back to. Always put it in writing with detail.

Underpricing to win work. Winning a job at a price that barely covers your costs is worse than not winning it. You will resent the work, rush through it, and damage your reputation. Price fairly and let the quality of your work and your professionalism justify the cost. See our guide on what builders charge per day to benchmark your rates.

Not accounting for your own time. If you are a sole trader who runs the jobs, your labour is a cost. Too many builders price the subcontractors but forget to include a day rate for their own time on site. You are not volunteering.

Vague scope of work. "Build a single-storey rear extension as discussed" is not a scope of work. It is an invitation for the customer to assume everything is included. Write out exactly what you will do, step by step. And just as importantly, write out what is not included.

Not including a validity period. Material prices change. If a customer comes back three months later expecting the same price, and timber has gone up 15%, you are stuck if your quote did not have a validity period. Thirty days is standard.

Sending the quote late. The first builder to send a professional, detailed quote often wins the job. Customers lose enthusiasm and trust when they have to chase for your price. Aim to send your quote within 24-48 hours of the site visit.

Frequently Asked Questions