Builder Costs in Derry
Northern Ireland | Prices updated for 2026 | All estimates include labour and materials
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Estimated cost in Derry
£11,480 - £31,160
Single Storey Extension (medium (15-25 sqm))
Typical duration: 6-12 weeks
Builder Prices in Derry
Single Storey Extension
£11,480 - £31,160Labour
£6,560 - £16,400
Materials
£4,920 - £14,760
Typical duration: 6-12 weeks
Garage Conversion
£5,330 - £12,300Labour
£3,280 - £7,380
Materials
£2,050 - £4,920
Typical duration: 2-4 weeks
Internal Wall Removal
£574 - £1,886Labour
£410 - £1,230
Materials
£164 - £656
Typical duration: 1-3 days
Patio Construction
£1,066 - £3,690Labour
£656 - £2,050
Materials
£410 - £1,640
Typical duration: 2-5 days
How Derry Compares
Cheaper than average
Trade prices in Derry are typically 18% below the national average. This reflects local labour rates and the cost of living in Northern Ireland.
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 Derry?
Builder prices in Derry typically range from £574 for internal wall removal to £31,160 for single storey extension. Prices include both labour and materials.
What is the average cost of single storey extension in Derry?
Single Storey Extension in Derry costs between £11,480 and £31,160 on average, depending on the scope of work and materials chosen.
When is the cheapest time to hire a builder in Derry?
Demand for builder work in Derry is typically lowest in January. Booking during quieter months may mean better availability and competitive pricing.
Are builder prices in Derry above or below the national average?
Builder prices in Derry are around 18% below the national average, making it a more affordable area for this type of work.
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