South West regional pricing

How Much Does a Builder Cost in Swindon?

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

14 services priced
South West region
Updated

Price summary

Swindon Price Summary

Service Low Average High
Single Storey Extension £29,790 £49,650 £79,440
Double Storey Extension £49,650 £84,405 £139,020
Loft Conversion £24,825 £44,685 £74,475

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

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Full pricing

All Builder Prices in Swindon

Every price adjusted for Swindon using a 0.993x cost multiplier, rounded to the nearest £5.

Single Storey Extension

Low

£29,790

Average

£49,650

High

£79,440

8-12 weeks

Double Storey Extension

Low

£49,650

Average

£84,405

High

£139,020

12-20 weeks

Loft Conversion

Low

£24,825

Average

£44,685

High

£74,475

6-10 weeks

Garage Conversion

Low

£7,945

Average

£14,895

High

£24,825

2-4 weeks

Porch Build

Low

£2,485

Average

£4,470

High

£7,945

1-2 weeks

Garden Wall

Low

£795

Average

£1,490

High

£2,980

2-4 days

Knock Through Internal Wall

Low

£995

Average

£1,785

High

£3,475

2-4 days

Chimney Breast Removal

Low

£1,190

Average

£1,985

High

£3,475

2-4 days

Underpinning

Low

£4,965

Average

£11,915

High

£24,825

2-4 weeks

Damp Proof Course

Low

£495

Average

£1,190

High

£2,485

1-3 days

New Build Garage

Low

£9,930

Average

£17,875

High

£29,790

3-5 weeks

Outbuilding or Garden Room

Low

£11,915

Average

£24,825

High

£49,650

3-6 weeks

Structural Steelwork (RSJ Installation)

Low

£995

Average

£1,785

High

£2,980

1-2 days

Patio or Decking Build

Low

£1,490

Average

£3,475

High

£6,950

3-5 days

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Regional comparison

How Swindon Compares

Average cost of single storey extension across regions.

Swindon
-1% £49,650
National Average
baseline £50,000
London
+24% £62,150

Local insights

What Affects Builder Costs in Swindon?

The South West has a mix of housing styles, from Victorian and Edwardian semis to 1930s suburban developments and modern estates. In and around Swindon, 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 West sits above the national average for trade costs, influenced by proximity to London and the generally higher cost of living. Labour rates in Swindon 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 Swindon 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 £49,650 to £139,020 for double storey extension in Swindon. Coastal properties in the South West may face additional considerations that affect pricing.

When getting quotes in Swindon, 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 Swindon

Explore costs for other services in the Swindon area.

40 services — scroll to explore

Common questions

Frequently Asked Questions

Common questions about builder costs in Swindon.

How much does a builder cost in Swindon in 2026?
Single Storey Extension in Swindon typically costs between £29,790 and £79,440, with the average being around £49,650. Prices vary depending on the scope of work, materials used, and the specific requirements of your property.
Are builder prices cheaper in Swindon than London?
Yes. Swindon 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 £12,500 compared to the same job in London.
How do I find a good builder in Swindon?
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 Swindon?
The main factors are the scope and complexity of what you need, the options and products chosen, and local market rates. Swindon 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 Swindon?
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.