South East regional pricing

How Much Does a Builder Cost in Dartford?

Updated prices for . Dartford prices are typically 9% above the national average.

14 services priced
South East region
Updated

Price summary

Dartford Price Summary

Service Low Average High
Single Storey Extension £32,730 £54,550 £87,280
Double Storey Extension £54,550 £92,735 £152,740
Loft Conversion £27,275 £49,095 £81,825

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

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Full pricing

All Builder Prices in Dartford

Every price adjusted for Dartford using a 1.091x cost multiplier, rounded to the nearest £5.

Single Storey Extension

Low

£32,730

Average

£54,550

High

£87,280

8-12 weeks

Double Storey Extension

Low

£54,550

Average

£92,735

High

£152,740

12-20 weeks

Loft Conversion

Low

£27,275

Average

£49,095

High

£81,825

6-10 weeks

Garage Conversion

Low

£8,730

Average

£16,365

High

£27,275

2-4 weeks

Porch Build

Low

£2,730

Average

£4,910

High

£8,730

1-2 weeks

Garden Wall

Low

£875

Average

£1,635

High

£3,275

2-4 days

Knock Through Internal Wall

Low

£1,090

Average

£1,965

High

£3,820

2-4 days

Chimney Breast Removal

Low

£1,310

Average

£2,180

High

£3,820

2-4 days

Underpinning

Low

£5,455

Average

£13,090

High

£27,275

2-4 weeks

Damp Proof Course

Low

£545

Average

£1,310

High

£2,730

1-3 days

New Build Garage

Low

£10,910

Average

£19,640

High

£32,730

3-5 weeks

Outbuilding or Garden Room

Low

£13,090

Average

£27,275

High

£54,550

3-6 weeks

Structural Steelwork (RSJ Installation)

Low

£1,090

Average

£1,965

High

£3,275

1-2 days

Patio or Decking Build

Low

£1,635

Average

£3,820

High

£7,635

3-5 days

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Regional comparison

How Dartford Compares

Average cost of single storey extension across regions.

Dartford
+9% £54,550
National Average
baseline £50,000
London
+24% £62,150

Local insights

What Affects Builder Costs in Dartford?

The South East has a mix of housing styles, from Victorian and Edwardian semis to 1930s suburban developments and modern estates. In and around Dartford, 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 Dartford are typically 9% 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 Dartford 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 £54,550 to £152,740 for double storey extension in Dartford. Coastal properties in the South East may face additional considerations that affect pricing.

When getting quotes in Dartford, 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 Dartford

Explore costs for other services in the Dartford area.

40 services — scroll to explore

Common questions

Frequently Asked Questions

Common questions about builder costs in Dartford.

How much does a builder cost in Dartford in 2026?
Single Storey Extension in Dartford typically costs between £32,730 and £87,280, with the average being around £54,550. Prices vary depending on the scope of work, materials used, and the specific requirements of your property.
Are builder prices cheaper in Dartford than London?
Dartford prices are 9% above the national average, though still £7,600 cheaper than London for single storey extension.
How do I find a good builder in Dartford?
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 Dartford?
The main factors are the scope and complexity of what you need, the options and products chosen, and local market rates. Dartford rates are 9% above the national average. Getting multiple quotes is the best way to ensure a fair price.
Do builder prices include materials in Dartford?
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.