Builder Costs in Northampton
East Midlands | Prices updated for 2026 | All estimates include labour and materials
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Estimated cost in Northampton
£14,000 - £38,000
Single Storey Extension (medium (15-25 sqm))
Typical duration: 6-12 weeks
Builder Prices in Northampton
Single Storey Extension
£14,000 - £38,000Labour
£8,000 - £20,000
Materials
£6,000 - £18,000
Typical duration: 6-12 weeks
Garage Conversion
£6,500 - £15,000Labour
£4,000 - £9,000
Materials
£2,500 - £6,000
Typical duration: 2-4 weeks
Internal Wall Removal
£700 - £2,300Labour
£500 - £1,500
Materials
£200 - £800
Typical duration: 1-3 days
Patio Construction
£1,300 - £4,500Labour
£800 - £2,500
Materials
£500 - £2,000
Typical duration: 2-5 days
How Northampton Compares
Around the national average
Trade prices in Northampton are typically in line with the national average. This reflects local labour rates and the cost of living in East Midlands.
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 Northampton?
Builder prices in Northampton typically range from £700 for internal wall removal to £38,000 for single storey extension. Prices include both labour and materials.
What is the average cost of single storey extension in Northampton?
Single Storey Extension in Northampton costs between £14,000 and £38,000 on average, depending on the scope of work and materials chosen.
When is the cheapest time to hire a builder in Northampton?
Demand for builder work in Northampton is typically lowest in January. Booking during quieter months may mean better availability and competitive pricing.
Are builder prices in Northampton above or below the national average?
Builder prices in Northampton are broadly in line with the national average.
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