Builder Costs in Caerphilly
Wales | Prices updated for 2026 | All estimates include labour and materials
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Estimated cost in Caerphilly
£12,040 - £32,680
Single Storey Extension (medium (15-25 sqm))
Typical duration: 6-12 weeks
Builder Prices in Caerphilly
Single Storey Extension
£12,040 - £32,680Labour
£6,880 - £17,200
Materials
£5,160 - £15,480
Typical duration: 6-12 weeks
Garage Conversion
£5,590 - £12,900Labour
£3,440 - £7,740
Materials
£2,150 - £5,160
Typical duration: 2-4 weeks
Internal Wall Removal
£602 - £1,978Labour
£430 - £1,290
Materials
£172 - £688
Typical duration: 1-3 days
Patio Construction
£1,118 - £3,870Labour
£688 - £2,150
Materials
£430 - £1,720
Typical duration: 2-5 days
How Caerphilly Compares
Cheaper than average
Trade prices in Caerphilly are typically 14% below the national average. This reflects local labour rates and the cost of living in Wales.
Seasonal Demand for Builder Work
Peak demand is typically in Jul, with the quietest period around Jan. You may find lower prices and better availability during off-peak months.
What Affects the Price
Single Storey Extension
- Extension size (square metres)
- Foundation type required by ground conditions
- Roof design (flat, pitched, or lean-to)
- Level of internal finish and specification
- Planning permission or permitted development status
Garage Conversion
- Garage size and structural condition
- Level of insulation and damp proofing needed
- Whether plumbing or electrics are required
- Quality of internal finish
Internal Wall Removal
- Whether the wall is load-bearing
- Steel beam size and specification
- Services (pipes, wires) running through the wall
- Making good to floor, ceiling, and adjacent walls
Patio Construction
- Patio area (square metres)
- Material choice (concrete slabs, natural stone, porcelain)
- Ground preparation and levelling
- Drainage and edging requirements
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Frequently Asked Questions
How much does a builder cost in Caerphilly?
Builder prices in Caerphilly typically range from £602 for internal wall removal to £32,680 for single storey extension. Prices include both labour and materials.
What is the average cost of single storey extension in Caerphilly?
Single Storey Extension in Caerphilly costs between £12,040 and £32,680 on average, depending on the scope of work and materials chosen.
When is the cheapest time to hire a builder in Caerphilly?
Demand for builder work in Caerphilly is typically lowest in January. Booking during quieter months may mean better availability and competitive pricing.
Are builder prices in Caerphilly above or below the national average?
Builder prices in Caerphilly are around 14% below the national average, making it a more affordable area for this type of work.
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