South East regional pricing

How Much Does a Builder Cost in Southampton?

Updated prices for . Southampton prices are typically 4% below the national average.

14 services priced
South East region
Updated

Price summary

Southampton Price Summary

Service Low Average High
Single Storey Extension £28,860 £48,100 £76,960
Double Storey Extension £48,100 £81,770 £134,680
Loft Conversion £24,050 £43,290 £72,150

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

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Full pricing

All Builder Prices in Southampton

Every price adjusted for Southampton using a 0.962x cost multiplier, rounded to the nearest £5.

Single Storey Extension

Low

£28,860

Average

£48,100

High

£76,960

8-12 weeks

Double Storey Extension

Low

£48,100

Average

£81,770

High

£134,680

12-20 weeks

Loft Conversion

Low

£24,050

Average

£43,290

High

£72,150

6-10 weeks

Garage Conversion

Low

£7,695

Average

£14,430

High

£24,050

2-4 weeks

Porch Build

Low

£2,405

Average

£4,330

High

£7,695

1-2 weeks

Garden Wall

Low

£770

Average

£1,445

High

£2,885

2-4 days

Knock Through Internal Wall

Low

£960

Average

£1,730

High

£3,365

2-4 days

Chimney Breast Removal

Low

£1,155

Average

£1,925

High

£3,365

2-4 days

Underpinning

Low

£4,810

Average

£11,545

High

£24,050

2-4 weeks

Damp Proof Course

Low

£480

Average

£1,155

High

£2,405

1-3 days

New Build Garage

Low

£9,620

Average

£17,315

High

£28,860

3-5 weeks

Outbuilding or Garden Room

Low

£11,545

Average

£24,050

High

£48,100

3-6 weeks

Structural Steelwork (RSJ Installation)

Low

£960

Average

£1,730

High

£2,885

1-2 days

Patio or Decking Build

Low

£1,445

Average

£3,365

High

£6,735

3-5 days

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Regional comparison

How Southampton Compares

Average cost of single storey extension across regions.

Southampton
-4% £48,100
National Average
baseline £50,000
London
+24% £62,150

Local insights

What Affects Builder Costs in Southampton?

The South East has a mix of housing styles, from Victorian and Edwardian semis to 1930s suburban developments and modern estates. In and around Southampton, 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 Southampton are typically 4% 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 Southampton 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 £48,100 to £134,680 for double storey extension in Southampton. Coastal properties in the South East may face additional considerations that affect pricing.

When getting quotes in Southampton, 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 Southampton

Explore costs for other services in the Southampton area.

40 services — scroll to explore

Common questions

Frequently Asked Questions

Common questions about builder costs in Southampton.

How much does a builder cost in Southampton in 2026?
Single Storey Extension in Southampton typically costs between £28,860 and £76,960, with the average being around £48,100. Prices vary depending on the scope of work, materials used, and the specific requirements of your property.
Are builder prices cheaper in Southampton than London?
Yes. Southampton builder costs are typically 4% below the national average, while London prices run around 24% above it. For single storey extension, you could save over £14,050 compared to the same job in London.
How do I find a good builder in Southampton?
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 Southampton?
The main factors are the scope and complexity of what you need, the options and products chosen, and local market rates. Southampton rates are 4% below the national average. Getting multiple quotes is the best way to ensure a fair price.
Do builder prices include materials in Southampton?
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.