South West regional pricing

How Much Does a Builder Cost in Bath?

Updated prices for . Bath prices are typically 7% above the national average.

14 services priced
South West region
Updated

Price summary

Bath Price Summary

Service Low Average High
Single Storey Extension £31,980 £53,300 £85,280
Double Storey Extension £53,300 £90,610 £149,240
Loft Conversion £26,650 £47,970 £79,950

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

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Full pricing

All Builder Prices in Bath

Every price adjusted for Bath using a 1.066x cost multiplier, rounded to the nearest £5.

Single Storey Extension

Low

£31,980

Average

£53,300

High

£85,280

8-12 weeks

Double Storey Extension

Low

£53,300

Average

£90,610

High

£149,240

12-20 weeks

Loft Conversion

Low

£26,650

Average

£47,970

High

£79,950

6-10 weeks

Garage Conversion

Low

£8,530

Average

£15,990

High

£26,650

2-4 weeks

Porch Build

Low

£2,665

Average

£4,795

High

£8,530

1-2 weeks

Garden Wall

Low

£855

Average

£1,600

High

£3,200

2-4 days

Knock Through Internal Wall

Low

£1,065

Average

£1,920

High

£3,730

2-4 days

Chimney Breast Removal

Low

£1,280

Average

£2,130

High

£3,730

2-4 days

Underpinning

Low

£5,330

Average

£12,790

High

£26,650

2-4 weeks

Damp Proof Course

Low

£535

Average

£1,280

High

£2,665

1-3 days

New Build Garage

Low

£10,660

Average

£19,190

High

£31,980

3-5 weeks

Outbuilding or Garden Room

Low

£12,790

Average

£26,650

High

£53,300

3-6 weeks

Structural Steelwork (RSJ Installation)

Low

£1,065

Average

£1,920

High

£3,200

1-2 days

Patio or Decking Build

Low

£1,600

Average

£3,730

High

£7,460

3-5 days

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Regional comparison

How Bath Compares

Average cost of single storey extension across regions.

Bath
+7% £53,300
National Average
baseline £50,000
London
+24% £62,150

Local insights

What Affects Builder Costs in Bath?

The South West has a mix of housing styles, from Victorian and Edwardian semis to 1930s suburban developments and modern estates. In and around Bath, 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 Bath are typically 7% above 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 Bath 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 £53,300 to £149,240 for double storey extension in Bath. Coastal properties in the South West may face additional considerations that affect pricing.

When getting quotes in Bath, 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 Bath

Explore costs for other services in the Bath area.

40 services — scroll to explore

Common questions

Frequently Asked Questions

Common questions about builder costs in Bath.

How much does a builder cost in Bath in 2026?
Single Storey Extension in Bath typically costs between £31,980 and £85,280, with the average being around £53,300. Prices vary depending on the scope of work, materials used, and the specific requirements of your property.
Are builder prices cheaper in Bath than London?
Bath prices are 7% above the national average, though still £8,850 cheaper than London for single storey extension.
How do I find a good builder in Bath?
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 Bath?
The main factors are the scope and complexity of what you need, the options and products chosen, and local market rates. Bath rates are 7% above the national average. Getting multiple quotes is the best way to ensure a fair price.
Do builder prices include materials in Bath?
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.