South East regional pricing

How Much Does a Builder Cost in Slough?

Updated prices for . Slough prices are typically 1% below the national average.

14 services priced
South East region
Updated

Price summary

Slough Price Summary

Service Low Average High
Single Storey Extension £29,670 £49,450 £79,120
Double Storey Extension £49,450 £84,065 £138,460
Loft Conversion £24,725 £44,505 £74,175

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

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Full pricing

All Builder Prices in Slough

Every price adjusted for Slough using a 0.989x cost multiplier, rounded to the nearest £5.

Single Storey Extension

Low

£29,670

Average

£49,450

High

£79,120

8-12 weeks

Double Storey Extension

Low

£49,450

Average

£84,065

High

£138,460

12-20 weeks

Loft Conversion

Low

£24,725

Average

£44,505

High

£74,175

6-10 weeks

Garage Conversion

Low

£7,910

Average

£14,835

High

£24,725

2-4 weeks

Porch Build

Low

£2,475

Average

£4,450

High

£7,910

1-2 weeks

Garden Wall

Low

£790

Average

£1,485

High

£2,965

2-4 days

Knock Through Internal Wall

Low

£990

Average

£1,780

High

£3,460

2-4 days

Chimney Breast Removal

Low

£1,185

Average

£1,980

High

£3,460

2-4 days

Underpinning

Low

£4,945

Average

£11,870

High

£24,725

2-4 weeks

Damp Proof Course

Low

£495

Average

£1,185

High

£2,475

1-3 days

New Build Garage

Low

£9,890

Average

£17,800

High

£29,670

3-5 weeks

Outbuilding or Garden Room

Low

£11,870

Average

£24,725

High

£49,450

3-6 weeks

Structural Steelwork (RSJ Installation)

Low

£990

Average

£1,780

High

£2,965

1-2 days

Patio or Decking Build

Low

£1,485

Average

£3,460

High

£6,925

3-5 days

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Regional comparison

How Slough Compares

Average cost of single storey extension across regions.

Slough
-1% £49,450
National Average
baseline £50,000
London
+24% £62,150

Local insights

What Affects Builder Costs in Slough?

The South East has a mix of housing styles, from Victorian and Edwardian semis to 1930s suburban developments and modern estates. In and around Slough, many properties in areas near Surrey and Kent vary in age and condition. Older properties with original features typically cost more for builder work due to additional preparation and access challenges.

The South East sits above the national average for trade costs, influenced by proximity to London and the generally higher cost of living. Labour rates in Slough are typically 1% below the UK average. Despite this, there's a strong supply of qualified builder professionals across the region. Prices can vary 30-50% between different tradespeople for the same job, so getting multiple quotes is essential.

What you pay for builder work in Slough depends on the complexity of the job, the materials used, and the condition of your property. Older detached and semi-detached homes often present more challenges that add to the cost. For larger jobs, expect to pay £49,450 to £138,460 for double storey extension in Slough. Coastal properties in the South East may face additional considerations that affect pricing.

When getting quotes in Slough, aim for at least three from different qualified professionals. Ask each one to visit and assess the work rather than quoting over the phone. A good builder will check the existing setup, identify complications, and provide a detailed cost breakdown. Be wary of quotes that seem significantly cheaper — they may be cutting corners on materials or quality. Always check qualifications, insurance and recent reviews.

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More services

Other Services in Slough

Explore costs for other services in the Slough area.

40 services — scroll to explore

Common questions

Frequently Asked Questions

Common questions about builder costs in Slough.

How much does a builder cost in Slough in 2026?
Single Storey Extension in Slough typically costs between £29,670 and £79,120, with the average being around £49,450. Prices vary depending on the scope of work, materials used, and the specific requirements of your property.
Are builder prices cheaper in Slough than London?
Yes. Slough builder costs are typically 1% below the national average, while London prices run around 24% above it. For single storey extension, you could save over £12,700 compared to the same job in London.
How do I find a good builder in Slough?
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 Slough?
The main factors are the scope and complexity of what you need, the options and products chosen, and local market rates. Slough rates are 1% below the national average. Getting multiple quotes is the best way to ensure a fair price.
Do builder prices include materials in Slough?
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.