Price Guide
How Much Does a Builder Really Cost?
Compare prices for 14 services across 343 UK locations. Data-driven pricing updated for .
National pricing
Builder Prices
National average prices. Select a city below for local pricing.
| Job | Low | Average | High | Duration |
|---|---|---|---|---|
| Single Storey Extension | £30,000 | £50,000 | £80,000 | 8-12 weeks |
| Double Storey Extension | £50,000 | £85,000 | £140,000 | 12-20 weeks |
| Loft Conversion | £25,000 | £45,000 | £75,000 | 6-10 weeks |
| Garage Conversion | £8,000 | £15,000 | £25,000 | 2-4 weeks |
| Porch Build | £2,500 | £4,500 | £8,000 | 1-2 weeks |
| Garden Wall | £800 | £1,500 | £3,000 | 2-4 days |
| Knock Through Internal Wall | £1,000 | £1,800 | £3,500 | 2-4 days |
| Chimney Breast Removal | £1,200 | £2,000 | £3,500 | 2-4 days |
| Underpinning | £5,000 | £12,000 | £25,000 | 2-4 weeks |
| Damp Proof Course | £500 | £1,200 | £2,500 | 1-3 days |
| New Build Garage | £10,000 | £18,000 | £30,000 | 3-5 weeks |
| Outbuilding or Garden Room | £12,000 | £25,000 | £50,000 | 3-6 weeks |
| Structural Steelwork (RSJ Installation) | £1,000 | £1,800 | £3,000 | 1-2 days |
| Patio or Decking Build | £1,500 | £3,500 | £7,000 | 3-5 days |
Single Storey Extension
Low
£30,000
Average
£50,000
High
£80,000
8-12 weeks
Double Storey Extension
Low
£50,000
Average
£85,000
High
£140,000
12-20 weeks
Loft Conversion
Low
£25,000
Average
£45,000
High
£75,000
6-10 weeks
Garage Conversion
Low
£8,000
Average
£15,000
High
£25,000
2-4 weeks
Porch Build
Low
£2,500
Average
£4,500
High
£8,000
1-2 weeks
Garden Wall
Low
£800
Average
£1,500
High
£3,000
2-4 days
Knock Through Internal Wall
Low
£1,000
Average
£1,800
High
£3,500
2-4 days
Chimney Breast Removal
Low
£1,200
Average
£2,000
High
£3,500
2-4 days
Underpinning
Low
£5,000
Average
£12,000
High
£25,000
2-4 weeks
Damp Proof Course
Low
£500
Average
£1,200
High
£2,500
1-3 days
New Build Garage
Low
£10,000
Average
£18,000
High
£30,000
3-5 weeks
Outbuilding or Garden Room
Low
£12,000
Average
£25,000
High
£50,000
3-6 weeks
Structural Steelwork (RSJ Installation)
Low
£1,000
Average
£1,800
High
£3,000
1-2 days
Patio or Decking Build
Low
£1,500
Average
£3,500
High
£7,000
3-5 days
Regional comparison
Single Storey Extension by City
Average cost of single storey extension across key UK cities.
Local pricing
Find Builder Costs in Your City
Browse all 343 cities for local builder pricing.
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Overview
What Does a Builder Do?
A builder provides professional services covering extensions, conversions, structural work and general building projects. They handle everything from routine maintenance and inspections to full installations and emergency repairs. Whether you need a small repair or a major project, hiring a qualified builder ensures the work is done safely, to code, and to a professional standard.
You should hire a builder whenever you need work that requires specialist skills, tools, or qualifications. Many types of builder work are regulated and must be carried out by a certified professional. Attempting DIY on regulated work can be dangerous, void your insurance, and create costly problems down the line.
Pricing for builder services depends on the complexity of what you need, the options chosen, and where you live in the UK. Simpler services sit at the lower end of the scale, while more involved or premium options will be significantly more expensive. The prices on this page give you a realistic range for each type of service so you know what to expect before getting quotes.
When hiring a builder, always get at least three quotes from different tradespeople. Read recent reviews and ask for references. Always check qualifications, insurance and recent reviews. A reputable builder will be happy to provide a detailed breakdown of costs and explain exactly what is included in their quote.
Common questions
Frequently Asked Questions
Common questions about builder costs in the UK.