London regional pricing

How Much Does a Builder Cost in Hounslow?

Updated prices for . Hounslow prices are typically 8% above the national average.

14 services priced
London region
Updated

Price summary

Hounslow Price Summary

Service Low Average High
Single Storey Extension £32,430 £54,050 £86,480
Double Storey Extension £54,050 £91,885 £151,340
Loft Conversion £27,025 £48,645 £81,075

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

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Full pricing

All Builder Prices in Hounslow

Every price adjusted for Hounslow using a 1.081x cost multiplier, rounded to the nearest £5.

Single Storey Extension

Low

£32,430

Average

£54,050

High

£86,480

8-12 weeks

Double Storey Extension

Low

£54,050

Average

£91,885

High

£151,340

12-20 weeks

Loft Conversion

Low

£27,025

Average

£48,645

High

£81,075

6-10 weeks

Garage Conversion

Low

£8,650

Average

£16,215

High

£27,025

2-4 weeks

Porch Build

Low

£2,705

Average

£4,865

High

£8,650

1-2 weeks

Garden Wall

Low

£865

Average

£1,620

High

£3,245

2-4 days

Knock Through Internal Wall

Low

£1,080

Average

£1,945

High

£3,785

2-4 days

Chimney Breast Removal

Low

£1,295

Average

£2,160

High

£3,785

2-4 days

Underpinning

Low

£5,405

Average

£12,970

High

£27,025

2-4 weeks

Damp Proof Course

Low

£540

Average

£1,295

High

£2,705

1-3 days

New Build Garage

Low

£10,810

Average

£19,460

High

£32,430

3-5 weeks

Outbuilding or Garden Room

Low

£12,970

Average

£27,025

High

£54,050

3-6 weeks

Structural Steelwork (RSJ Installation)

Low

£1,080

Average

£1,945

High

£3,245

1-2 days

Patio or Decking Build

Low

£1,620

Average

£3,785

High

£7,565

3-5 days

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Regional comparison

How Hounslow Compares

Average cost of single storey extension across regions.

Hounslow
+8% £54,050
National Average
baseline £50,000
London
+24% £62,150

Local insights

What Affects Builder Costs in Hounslow?

Hounslow'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 Hounslow. 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 Hounslow might quote £54,050 to £151,340 for double storey extension.

When getting quotes in Hounslow, 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 Hounslow

Explore costs for other services in the Hounslow area.

40 services — scroll to explore

Common questions

Frequently Asked Questions

Common questions about builder costs in Hounslow.

How much does a builder cost in Hounslow in 2026?
Single Storey Extension in Hounslow typically costs between £32,430 and £86,480, with the average being around £54,050. Prices vary depending on the scope of work, materials used, and the specific requirements of your property.
Are builder prices cheaper in Hounslow than London?
Hounslow prices are 8% above the national average, though still £8,100 cheaper than London for single storey extension.
How do I find a good builder in Hounslow?
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 Hounslow?
The main factors are the scope and complexity of what you need, the options and products chosen, and local market rates. Hounslow rates are 8% above the national average. Getting multiple quotes is the best way to ensure a fair price.
Do builder prices include materials in Hounslow?
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.