East of England regional pricing

How Much Does a Builder Cost in Chelmsford?

Updated prices for . Chelmsford prices are typically 17% above the national average.

14 services priced
East of England region
Updated

Price summary

Chelmsford Price Summary

Service Low Average High
Single Storey Extension £35,220 £58,700 £93,920
Double Storey Extension £58,700 £99,790 £164,360
Loft Conversion £29,350 £52,830 £88,050

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

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Full pricing

All Builder Prices in Chelmsford

Every price adjusted for Chelmsford using a 1.174x cost multiplier, rounded to the nearest £5.

Single Storey Extension

Low

£35,220

Average

£58,700

High

£93,920

8-12 weeks

Double Storey Extension

Low

£58,700

Average

£99,790

High

£164,360

12-20 weeks

Loft Conversion

Low

£29,350

Average

£52,830

High

£88,050

6-10 weeks

Garage Conversion

Low

£9,390

Average

£17,610

High

£29,350

2-4 weeks

Porch Build

Low

£2,935

Average

£5,285

High

£9,390

1-2 weeks

Garden Wall

Low

£940

Average

£1,760

High

£3,520

2-4 days

Knock Through Internal Wall

Low

£1,175

Average

£2,115

High

£4,110

2-4 days

Chimney Breast Removal

Low

£1,410

Average

£2,350

High

£4,110

2-4 days

Underpinning

Low

£5,870

Average

£14,090

High

£29,350

2-4 weeks

Damp Proof Course

Low

£585

Average

£1,410

High

£2,935

1-3 days

New Build Garage

Low

£11,740

Average

£21,130

High

£35,220

3-5 weeks

Outbuilding or Garden Room

Low

£14,090

Average

£29,350

High

£58,700

3-6 weeks

Structural Steelwork (RSJ Installation)

Low

£1,175

Average

£2,115

High

£3,520

1-2 days

Patio or Decking Build

Low

£1,760

Average

£4,110

High

£8,220

3-5 days

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Regional comparison

How Chelmsford Compares

Average cost of single storey extension across regions.

Chelmsford
+17% £58,700
National Average
baseline £50,000
London
+24% £62,150

Local insights

What Affects Builder Costs in Chelmsford?

The East of England has a mix of housing styles, from Victorian and Edwardian semis to 1930s suburban developments and modern estates. In and around Chelmsford, 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 East of England sits above the national average for trade costs, influenced by proximity to London and the generally higher cost of living. Labour rates in Chelmsford are typically 17% 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 Chelmsford 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 £58,700 to £164,360 for double storey extension in Chelmsford. Coastal properties in the East of England may face additional considerations that affect pricing.

When getting quotes in Chelmsford, 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 Chelmsford

Explore costs for other services in the Chelmsford area.

40 services — scroll to explore

Common questions

Frequently Asked Questions

Common questions about builder costs in Chelmsford.

How much does a builder cost in Chelmsford in 2026?
Single Storey Extension in Chelmsford typically costs between £35,220 and £93,920, with the average being around £58,700. Prices vary depending on the scope of work, materials used, and the specific requirements of your property.
Are builder prices cheaper in Chelmsford than London?
Chelmsford prices are 17% above the national average, though still £3,450 cheaper than London for single storey extension.
How do I find a good builder in Chelmsford?
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 Chelmsford?
The main factors are the scope and complexity of what you need, the options and products chosen, and local market rates. Chelmsford rates are 17% above the national average. Getting multiple quotes is the best way to ensure a fair price.
Do builder prices include materials in Chelmsford?
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.