Northern Ireland regional pricing

How Much Does a Builder Cost in Belfast?

Updated prices for . Belfast prices are typically 13% below the national average.

14 services priced
Northern Ireland region
Updated

Price summary

Belfast Price Summary

Service Low Average High
Single Storey Extension £26,100 £43,500 £69,600
Double Storey Extension £43,500 £73,950 £121,800
Loft Conversion £21,750 £39,150 £65,250

Prices include labour and materials. VAT may apply. Based on Northern Ireland regional pricing.

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Full pricing

All Builder Prices in Belfast

Every price adjusted for Belfast using a 0.87x cost multiplier, rounded to the nearest £5.

Single Storey Extension

Low

£26,100

Average

£43,500

High

£69,600

8-12 weeks

Double Storey Extension

Low

£43,500

Average

£73,950

High

£121,800

12-20 weeks

Loft Conversion

Low

£21,750

Average

£39,150

High

£65,250

6-10 weeks

Garage Conversion

Low

£6,960

Average

£13,050

High

£21,750

2-4 weeks

Porch Build

Low

£2,175

Average

£3,915

High

£6,960

1-2 weeks

Garden Wall

Low

£695

Average

£1,305

High

£2,610

2-4 days

Knock Through Internal Wall

Low

£870

Average

£1,565

High

£3,045

2-4 days

Chimney Breast Removal

Low

£1,045

Average

£1,740

High

£3,045

2-4 days

Underpinning

Low

£4,350

Average

£10,440

High

£21,750

2-4 weeks

Damp Proof Course

Low

£435

Average

£1,045

High

£2,175

1-3 days

New Build Garage

Low

£8,700

Average

£15,660

High

£26,100

3-5 weeks

Outbuilding or Garden Room

Low

£10,440

Average

£21,750

High

£43,500

3-6 weeks

Structural Steelwork (RSJ Installation)

Low

£870

Average

£1,565

High

£2,610

1-2 days

Patio or Decking Build

Low

£1,305

Average

£3,045

High

£6,090

3-5 days

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Regional comparison

How Belfast Compares

Average cost of single storey extension across regions.

Belfast
-13% £43,500
National Average
baseline £50,000
London
+24% £62,150

Local insights

What Affects Builder Costs in Belfast?

Scotland's housing stock includes distinctive tenement flats, Victorian and Georgian terraces, post-war council builds and modern developments. Belfast and surrounding areas have many properties with older infrastructure, particularly in tenement buildings. These older properties often present challenges for builder work that push costs toward the higher end of the ranges shown above.

Scotland sits below the national average for most trade costs. Labour rates in Belfast are around 13% below the UK average. There's a reasonable supply of qualified builder professionals across Scotland's central belt, though more remote areas may have fewer options and longer wait times. Prices still vary by 30-50% between different tradespeople, making multiple quotes essential.

Properties in Belfast present some specific challenges for builder work. Scottish tenement flats often have communal arrangements that complicate access. Older stone-built properties have thick walls that make certain work more difficult. The Scottish climate can also affect timing and approach. For larger projects in Belfast, expect to pay £43,500 to £121,800 for double storey extension.

When getting quotes in Belfast, 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 existing conditions, identify potential complications, and provide a clear 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 Belfast

Explore costs for other services in the Belfast area.

40 services — scroll to explore

Common questions

Frequently Asked Questions

Common questions about builder costs in Belfast.

How much does a builder cost in Belfast in 2026?
Single Storey Extension in Belfast typically costs between £26,100 and £69,600, with the average being around £43,500. Prices vary depending on the scope of work, materials used, and the specific requirements of your property.
Are builder prices cheaper in Belfast than London?
Yes. Belfast builder costs are typically 13% below the national average, while London prices run around 24% above it. For single storey extension, you could save over £18,650 compared to the same job in London.
How do I find a good builder in Belfast?
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 Belfast?
The main factors are the scope and complexity of what you need, the options and products chosen, and local market rates. Belfast rates are 13% below the national average. Getting multiple quotes is the best way to ensure a fair price.
Do builder prices include materials in Belfast?
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.