Northern Ireland regional pricing
How Much Does a Builder Cost in Belfast?
Updated prices for . Belfast prices are typically 13% below the national average.
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.
Full pricing
All Builder Prices in Belfast
Every price adjusted for Belfast using a 0.87x cost multiplier, rounded to the nearest £5.
| Job | Low | Average | High | Duration |
|---|---|---|---|---|
| Single Storey Extension | £26,100 | £43,500 | £69,600 | 8-12 weeks |
| Double Storey Extension | £43,500 | £73,950 | £121,800 | 12-20 weeks |
| Loft Conversion | £21,750 | £39,150 | £65,250 | 6-10 weeks |
| Garage Conversion | £6,960 | £13,050 | £21,750 | 2-4 weeks |
| Porch Build | £2,175 | £3,915 | £6,960 | 1-2 weeks |
| Garden Wall | £695 | £1,305 | £2,610 | 2-4 days |
| Knock Through Internal Wall | £870 | £1,565 | £3,045 | 2-4 days |
| Chimney Breast Removal | £1,045 | £1,740 | £3,045 | 2-4 days |
| Underpinning | £4,350 | £10,440 | £21,750 | 2-4 weeks |
| Damp Proof Course | £435 | £1,045 | £2,175 | 1-3 days |
| New Build Garage | £8,700 | £15,660 | £26,100 | 3-5 weeks |
| Outbuilding or Garden Room | £10,440 | £21,750 | £43,500 | 3-6 weeks |
| Structural Steelwork (RSJ Installation) | £870 | £1,565 | £2,610 | 1-2 days |
| Patio or Decking Build | £1,305 | £3,045 | £6,090 | 3-5 days |
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
Regional comparison
How Belfast Compares
Average cost of single storey extension across regions.
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.
More services
Other Services in Belfast
Explore costs for other services in the Belfast area.
40 services — scroll to explore
UK-wide pricing
Builder Costs in Other Cities
Compare builder prices across the UK.
Common questions
Frequently Asked Questions
Common questions about builder costs in Belfast.