Wales regional pricing
How Much Does a Builder Cost in Carmarthenshire?
Updated prices for . Carmarthenshire prices are typically 3% below the national average.
Price summary
Carmarthenshire Price Summary
| Service | Low | Average | High |
|---|---|---|---|
| Single Storey Extension | £29,250 | £48,750 | £78,000 |
| Double Storey Extension | £48,750 | £82,875 | £136,500 |
| Loft Conversion | £24,375 | £43,875 | £73,125 |
Prices include labour and materials. VAT may apply. Based on Wales regional pricing.
Full pricing
All Builder Prices in Carmarthenshire
Every price adjusted for Carmarthenshire using a 0.975x cost multiplier, rounded to the nearest £5.
| Job | Low | Average | High | Duration |
|---|---|---|---|---|
| Single Storey Extension | £29,250 | £48,750 | £78,000 | 8-12 weeks |
| Double Storey Extension | £48,750 | £82,875 | £136,500 | 12-20 weeks |
| Loft Conversion | £24,375 | £43,875 | £73,125 | 6-10 weeks |
| Garage Conversion | £7,800 | £14,625 | £24,375 | 2-4 weeks |
| Porch Build | £2,440 | £4,390 | £7,800 | 1-2 weeks |
| Garden Wall | £780 | £1,465 | £2,925 | 2-4 days |
| Knock Through Internal Wall | £975 | £1,755 | £3,415 | 2-4 days |
| Chimney Breast Removal | £1,170 | £1,950 | £3,415 | 2-4 days |
| Underpinning | £4,875 | £11,700 | £24,375 | 2-4 weeks |
| Damp Proof Course | £490 | £1,170 | £2,440 | 1-3 days |
| New Build Garage | £9,750 | £17,550 | £29,250 | 3-5 weeks |
| Outbuilding or Garden Room | £11,700 | £24,375 | £48,750 | 3-6 weeks |
| Structural Steelwork (RSJ Installation) | £975 | £1,755 | £2,925 | 1-2 days |
| Patio or Decking Build | £1,465 | £3,415 | £6,825 | 3-5 days |
Single Storey Extension
Low
£29,250
Average
£48,750
High
£78,000
8-12 weeks
Double Storey Extension
Low
£48,750
Average
£82,875
High
£136,500
12-20 weeks
Loft Conversion
Low
£24,375
Average
£43,875
High
£73,125
6-10 weeks
Garage Conversion
Low
£7,800
Average
£14,625
High
£24,375
2-4 weeks
Porch Build
Low
£2,440
Average
£4,390
High
£7,800
1-2 weeks
Garden Wall
Low
£780
Average
£1,465
High
£2,925
2-4 days
Knock Through Internal Wall
Low
£975
Average
£1,755
High
£3,415
2-4 days
Chimney Breast Removal
Low
£1,170
Average
£1,950
High
£3,415
2-4 days
Underpinning
Low
£4,875
Average
£11,700
High
£24,375
2-4 weeks
Damp Proof Course
Low
£490
Average
£1,170
High
£2,440
1-3 days
New Build Garage
Low
£9,750
Average
£17,550
High
£29,250
3-5 weeks
Outbuilding or Garden Room
Low
£11,700
Average
£24,375
High
£48,750
3-6 weeks
Structural Steelwork (RSJ Installation)
Low
£975
Average
£1,755
High
£2,925
1-2 days
Patio or Decking Build
Low
£1,465
Average
£3,415
High
£6,825
3-5 days
Regional comparison
How Carmarthenshire Compares
Average cost of single storey extension across regions.
Local insights
What Affects Builder Costs in Carmarthenshire?
Wales has a distinctive mix of housing, from Victorian and Edwardian terraces in the south to stone-built cottages and rural properties across the rest of the country. Carmarthenshire and the wider area around Swansea and the Valleys include many older properties that present challenges for builder work. Stone walls, exposed locations, and older infrastructure all tend to push costs toward the higher end.
Wales sits below the national average for trade costs. Labour rates in Carmarthenshire are typically 3% below the UK average. While this makes builder work more affordable, there can be fewer qualified professionals in rural areas compared to English cities, which can mean longer waiting times. In more populated areas, competition keeps prices reasonable. Always get at least three quotes.
Properties in Carmarthenshire can present specific challenges that affect builder costs. Stone-built and older Welsh terraces often have thick walls that make work more difficult and expensive. Properties in exposed or rural locations may face harsher weather conditions that influence timing and approach. For larger jobs in Carmarthenshire, expect to pay £48,750 to £136,500 for double storey extension.
When getting quotes in Carmarthenshire, 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 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.
More services
Other Services in Carmarthenshire
Explore costs for other services in the Carmarthenshire 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 Carmarthenshire.