London regional pricing
How Much Does a Builder Cost in Islington?
Updated prices for . Islington prices are typically 37% above the national average.
Price summary
Islington Price Summary
| Service | Low | Average | High |
|---|---|---|---|
| Single Storey Extension | £41,070 | £68,450 | £109,520 |
| Double Storey Extension | £68,450 | £116,365 | £191,660 |
| Loft Conversion | £34,225 | £61,605 | £102,675 |
Prices include labour and materials. VAT may apply. Based on London regional pricing.
Full pricing
All Builder Prices in Islington
Every price adjusted for Islington using a 1.369x cost multiplier, rounded to the nearest £5.
| Job | Low | Average | High | Duration |
|---|---|---|---|---|
| Single Storey Extension | £41,070 | £68,450 | £109,520 | 8-12 weeks |
| Double Storey Extension | £68,450 | £116,365 | £191,660 | 12-20 weeks |
| Loft Conversion | £34,225 | £61,605 | £102,675 | 6-10 weeks |
| Garage Conversion | £10,950 | £20,535 | £34,225 | 2-4 weeks |
| Porch Build | £3,425 | £6,160 | £10,950 | 1-2 weeks |
| Garden Wall | £1,095 | £2,055 | £4,105 | 2-4 days |
| Knock Through Internal Wall | £1,370 | £2,465 | £4,790 | 2-4 days |
| Chimney Breast Removal | £1,645 | £2,740 | £4,790 | 2-4 days |
| Underpinning | £6,845 | £16,430 | £34,225 | 2-4 weeks |
| Damp Proof Course | £685 | £1,645 | £3,425 | 1-3 days |
| New Build Garage | £13,690 | £24,640 | £41,070 | 3-5 weeks |
| Outbuilding or Garden Room | £16,430 | £34,225 | £68,450 | 3-6 weeks |
| Structural Steelwork (RSJ Installation) | £1,370 | £2,465 | £4,105 | 1-2 days |
| Patio or Decking Build | £2,055 | £4,790 | £9,585 | 3-5 days |
Single Storey Extension
Low
£41,070
Average
£68,450
High
£109,520
8-12 weeks
Double Storey Extension
Low
£68,450
Average
£116,365
High
£191,660
12-20 weeks
Loft Conversion
Low
£34,225
Average
£61,605
High
£102,675
6-10 weeks
Garage Conversion
Low
£10,950
Average
£20,535
High
£34,225
2-4 weeks
Porch Build
Low
£3,425
Average
£6,160
High
£10,950
1-2 weeks
Garden Wall
Low
£1,095
Average
£2,055
High
£4,105
2-4 days
Knock Through Internal Wall
Low
£1,370
Average
£2,465
High
£4,790
2-4 days
Chimney Breast Removal
Low
£1,645
Average
£2,740
High
£4,790
2-4 days
Underpinning
Low
£6,845
Average
£16,430
High
£34,225
2-4 weeks
Damp Proof Course
Low
£685
Average
£1,645
High
£3,425
1-3 days
New Build Garage
Low
£13,690
Average
£24,640
High
£41,070
3-5 weeks
Outbuilding or Garden Room
Low
£16,430
Average
£34,225
High
£68,450
3-6 weeks
Structural Steelwork (RSJ Installation)
Low
£1,370
Average
£2,465
High
£4,105
1-2 days
Patio or Decking Build
Low
£2,055
Average
£4,790
High
£9,585
3-5 days
Regional comparison
How Islington Compares
Average cost of single storey extension across regions.
Local insights
What Affects Builder Costs in Islington?
Islington'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 Islington. 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 Islington might quote £68,450 to £191,660 for double storey extension.
When getting quotes in Islington, 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 Islington
Explore costs for other services in the Islington 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 Islington.