South East regional pricing

How Much Does a Builder Cost in Lewes?

Updated prices for . Lewes prices are typically 12% above the national average.

14 services priced
South East region
Updated

Price summary

Lewes Price Summary

Service Low Average High
Single Storey Extension £33,540 £55,900 £89,440
Double Storey Extension £55,900 £95,030 £156,520
Loft Conversion £27,950 £50,310 £83,850

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

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Full pricing

All Builder Prices in Lewes

Every price adjusted for Lewes using a 1.118x cost multiplier, rounded to the nearest £5.

Single Storey Extension

Low

£33,540

Average

£55,900

High

£89,440

8-12 weeks

Double Storey Extension

Low

£55,900

Average

£95,030

High

£156,520

12-20 weeks

Loft Conversion

Low

£27,950

Average

£50,310

High

£83,850

6-10 weeks

Garage Conversion

Low

£8,945

Average

£16,770

High

£27,950

2-4 weeks

Porch Build

Low

£2,795

Average

£5,030

High

£8,945

1-2 weeks

Garden Wall

Low

£895

Average

£1,675

High

£3,355

2-4 days

Knock Through Internal Wall

Low

£1,120

Average

£2,010

High

£3,915

2-4 days

Chimney Breast Removal

Low

£1,340

Average

£2,235

High

£3,915

2-4 days

Underpinning

Low

£5,590

Average

£13,415

High

£27,950

2-4 weeks

Damp Proof Course

Low

£560

Average

£1,340

High

£2,795

1-3 days

New Build Garage

Low

£11,180

Average

£20,125

High

£33,540

3-5 weeks

Outbuilding or Garden Room

Low

£13,415

Average

£27,950

High

£55,900

3-6 weeks

Structural Steelwork (RSJ Installation)

Low

£1,120

Average

£2,010

High

£3,355

1-2 days

Patio or Decking Build

Low

£1,675

Average

£3,915

High

£7,825

3-5 days

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Regional comparison

How Lewes Compares

Average cost of single storey extension across regions.

Lewes
+12% £55,900
National Average
baseline £50,000
London
+24% £62,150

Local insights

What Affects Builder Costs in Lewes?

The South East has a mix of housing styles, from Victorian and Edwardian semis to 1930s suburban developments and modern estates. In and around Lewes, 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 Lewes are typically 12% 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 Lewes 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 £55,900 to £156,520 for double storey extension in Lewes. Coastal properties in the South East may face additional considerations that affect pricing.

When getting quotes in Lewes, 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 Lewes

Explore costs for other services in the Lewes area.

40 services — scroll to explore

Common questions

Frequently Asked Questions

Common questions about builder costs in Lewes.

How much does a builder cost in Lewes in 2026?
Single Storey Extension in Lewes typically costs between £33,540 and £89,440, with the average being around £55,900. Prices vary depending on the scope of work, materials used, and the specific requirements of your property.
Are builder prices cheaper in Lewes than London?
Lewes prices are 12% above the national average, though still £6,250 cheaper than London for single storey extension.
How do I find a good builder in Lewes?
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 Lewes?
The main factors are the scope and complexity of what you need, the options and products chosen, and local market rates. Lewes rates are 12% above the national average. Getting multiple quotes is the best way to ensure a fair price.
Do builder prices include materials in Lewes?
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.