London regional pricing
How Much Does a Builder Cost in Lewisham?
Updated prices for . Lewisham prices are typically 21% above the national average.
Price summary
Lewisham Price Summary
| Service | Low | Average | High |
|---|---|---|---|
| Single Storey Extension | £36,360 | £60,600 | £96,960 |
| Double Storey Extension | £60,600 | £103,020 | £169,680 |
| Loft Conversion | £30,300 | £54,540 | £90,900 |
Prices include labour and materials. VAT may apply. Based on London regional pricing.
Full pricing
All Builder Prices in Lewisham
Every price adjusted for Lewisham using a 1.212x cost multiplier, rounded to the nearest £5.
| Job | Low | Average | High | Duration |
|---|---|---|---|---|
| Single Storey Extension | £36,360 | £60,600 | £96,960 | 8-12 weeks |
| Double Storey Extension | £60,600 | £103,020 | £169,680 | 12-20 weeks |
| Loft Conversion | £30,300 | £54,540 | £90,900 | 6-10 weeks |
| Garage Conversion | £9,695 | £18,180 | £30,300 | 2-4 weeks |
| Porch Build | £3,030 | £5,455 | £9,695 | 1-2 weeks |
| Garden Wall | £970 | £1,820 | £3,635 | 2-4 days |
| Knock Through Internal Wall | £1,210 | £2,180 | £4,240 | 2-4 days |
| Chimney Breast Removal | £1,455 | £2,425 | £4,240 | 2-4 days |
| Underpinning | £6,060 | £14,545 | £30,300 | 2-4 weeks |
| Damp Proof Course | £605 | £1,455 | £3,030 | 1-3 days |
| New Build Garage | £12,120 | £21,815 | £36,360 | 3-5 weeks |
| Outbuilding or Garden Room | £14,545 | £30,300 | £60,600 | 3-6 weeks |
| Structural Steelwork (RSJ Installation) | £1,210 | £2,180 | £3,635 | 1-2 days |
| Patio or Decking Build | £1,820 | £4,240 | £8,485 | 3-5 days |
Single Storey Extension
Low
£36,360
Average
£60,600
High
£96,960
8-12 weeks
Double Storey Extension
Low
£60,600
Average
£103,020
High
£169,680
12-20 weeks
Loft Conversion
Low
£30,300
Average
£54,540
High
£90,900
6-10 weeks
Garage Conversion
Low
£9,695
Average
£18,180
High
£30,300
2-4 weeks
Porch Build
Low
£3,030
Average
£5,455
High
£9,695
1-2 weeks
Garden Wall
Low
£970
Average
£1,820
High
£3,635
2-4 days
Knock Through Internal Wall
Low
£1,210
Average
£2,180
High
£4,240
2-4 days
Chimney Breast Removal
Low
£1,455
Average
£2,425
High
£4,240
2-4 days
Underpinning
Low
£6,060
Average
£14,545
High
£30,300
2-4 weeks
Damp Proof Course
Low
£605
Average
£1,455
High
£3,030
1-3 days
New Build Garage
Low
£12,120
Average
£21,815
High
£36,360
3-5 weeks
Outbuilding or Garden Room
Low
£14,545
Average
£30,300
High
£60,600
3-6 weeks
Structural Steelwork (RSJ Installation)
Low
£1,210
Average
£2,180
High
£3,635
1-2 days
Patio or Decking Build
Low
£1,820
Average
£4,240
High
£8,485
3-5 days
Regional comparison
How Lewisham Compares
Average cost of single storey extension across regions.
Local insights
What Affects Builder Costs in Lewisham?
Lewisham's housing stock ranges from Georgian and Victorian terraces to post-war estates and modern new-builds. Properties across areas like Islington, Hackney and Brixton vary enormously in age, layout and condition, all of which directly affect builder costs. Older properties tend to need more preparation work and present access challenges that push prices toward the higher end of the ranges shown above.
London is the most expensive part of the UK for trade work, with labour rates running around 24% above the national average. This reflects the high cost of living, congestion charges, and expensive parking that tradespeople factor into their quotes. Despite the higher prices, there is no shortage of qualified builder professionals across the capital. Prices still vary by 30-50% between tradespeople for the same job, making multiple quotes essential.
Several factors affect what you will pay for builder work in Lewisham. The scope and complexity of the job is the biggest driver — straightforward work in accessible locations will be at the lower end, while anything involving older properties, difficult access, or structural complications will cost more. Material choices also make a significant difference; opting for premium brands or higher-spec products can add 20-40% to the total. For larger jobs, a builder in Lewisham might quote £60,600 to £169,680 for double storey extension.
When getting quotes in Lewisham, aim for at least three from different qualified professionals. Ask each one to visit and assess the work in person rather than quoting over the phone. A good builder will check the existing setup, identify any potential complications, and give you a detailed breakdown of costs. Be wary of quotes that seem significantly cheaper than others — they may be cutting corners on materials or not including everything in the price. Always check qualifications, insurance and recent reviews before hiring.
More services
Other Services in Lewisham
Explore costs for other services in the Lewisham area.
40 services — scroll to explore
UK-wide pricing
Builder Costs in Other Cities
Compare builder prices across the UK.
Common questions
Frequently Asked Questions
Common questions about builder costs in Lewisham.