Builder Costs in Northampton
East Midlands | Modelled planning ranges | Base prices dated May 2026 | Includes labour and materials
Cost Calculator
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
Our model for Northampton is in line with the base estimate. This is a location assumption, not a measured local quote average.
Illustrative Seasonality for Builder Work
Our seasonal model peaks in Jul and is lowest in Jan. This is not live demand data or a forecast of prices or availability.
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
Builder Profiles Near Northampton
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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.
Builder prices in nearby towns
Other trade prices in Northampton
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