London regional pricing

How Much Does a Builder Cost in Kensington and Chelsea?

Updated prices for . Kensington and Chelsea prices are typically 44% above the national average.

14 services priced
London region
Updated

Price summary

Kensington and Chelsea Price Summary

Service Low Average High
Single Storey Extension £43,170 £71,950 £115,120
Double Storey Extension £71,950 £122,315 £201,460
Loft Conversion £35,975 £64,755 £107,925

Prices include labour and materials. VAT may apply. Based on London regional pricing.

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Full pricing

All Builder Prices in Kensington and Chelsea

Every price adjusted for Kensington and Chelsea using a 1.439x cost multiplier, rounded to the nearest £5.

Single Storey Extension

Low

£43,170

Average

£71,950

High

£115,120

8-12 weeks

Double Storey Extension

Low

£71,950

Average

£122,315

High

£201,460

12-20 weeks

Loft Conversion

Low

£35,975

Average

£64,755

High

£107,925

6-10 weeks

Garage Conversion

Low

£11,510

Average

£21,585

High

£35,975

2-4 weeks

Porch Build

Low

£3,600

Average

£6,475

High

£11,510

1-2 weeks

Garden Wall

Low

£1,150

Average

£2,160

High

£4,315

2-4 days

Knock Through Internal Wall

Low

£1,440

Average

£2,590

High

£5,035

2-4 days

Chimney Breast Removal

Low

£1,725

Average

£2,880

High

£5,035

2-4 days

Underpinning

Low

£7,195

Average

£17,270

High

£35,975

2-4 weeks

Damp Proof Course

Low

£720

Average

£1,725

High

£3,600

1-3 days

New Build Garage

Low

£14,390

Average

£25,900

High

£43,170

3-5 weeks

Outbuilding or Garden Room

Low

£17,270

Average

£35,975

High

£71,950

3-6 weeks

Structural Steelwork (RSJ Installation)

Low

£1,440

Average

£2,590

High

£4,315

1-2 days

Patio or Decking Build

Low

£2,160

Average

£5,035

High

£10,075

3-5 days

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Regional comparison

How Kensington and Chelsea Compares

Average cost of single storey extension across regions.

Kensington and Chelsea
+44% £71,950
National Average
baseline £50,000
London
+24% £62,150

Local insights

What Affects Builder Costs in Kensington and Chelsea?

Kensington and Chelsea'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 Kensington and Chelsea. 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 Kensington and Chelsea might quote £71,950 to £201,460 for double storey extension.

When getting quotes in Kensington and Chelsea, 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.

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More services

Other Services in Kensington and Chelsea

Explore costs for other services in the Kensington and Chelsea area.

40 services — scroll to explore

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Common questions

Frequently Asked Questions

Common questions about builder costs in Kensington and Chelsea.

How much does a builder cost in Kensington and Chelsea in 2026?
Single Storey Extension in Kensington and Chelsea typically costs between £43,170 and £115,120, with the average being around £71,950. Prices vary depending on the scope of work, materials used, and the specific requirements of your property.
Are builder prices cheaper in Kensington and Chelsea than London?
Kensington and Chelsea prices are 44% above the national average, though still comparable to London for single storey extension.
How do I find a good builder in Kensington and Chelsea?
Get at least three quotes from different tradespeople, check recent reviews, and ask whether the quote includes VAT and everything you need. A detailed written quote that breaks down all costs is a good sign. Always check qualifications, insurance and recent reviews before hiring.
What affects builder prices in Kensington and Chelsea?
The main factors are the scope and complexity of what you need, the options and products chosen, and local market rates. Kensington and Chelsea rates are 44% above the national average. Getting multiple quotes is the best way to ensure a fair price.
Do builder prices include materials in Kensington and Chelsea?
The prices shown on this page include all typical costs. However, when getting real quotes, always confirm what is and isn't included. Some tradespeople break out costs separately, while others give an all-in price. Ask for a detailed breakdown before agreeing to any work.