Builder Costs in Grantham
East Midlands | Prices updated for 2026 | All estimates include labour and materials
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Estimated cost in Grantham
£12,600 - £34,200
Single Storey Extension (medium (15-25 sqm))
Typical duration: 6-12 weeks
Builder Prices in Grantham
Single Storey Extension
£12,600 - £34,200Labour
£7,200 - £18,000
Materials
£5,400 - £16,200
Typical duration: 6-12 weeks
Garage Conversion
£5,850 - £13,500Labour
£3,600 - £8,100
Materials
£2,250 - £5,400
Typical duration: 2-4 weeks
Internal Wall Removal
£630 - £2,070Labour
£450 - £1,350
Materials
£180 - £720
Typical duration: 1-3 days
Patio Construction
£1,170 - £4,050Labour
£720 - £2,250
Materials
£450 - £1,800
Typical duration: 2-5 days
How Grantham Compares
Cheaper than average
Trade prices in Grantham are typically 10% below 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 Grantham?
Builder prices in Grantham typically range from £630 for internal wall removal to £34,200 for single storey extension. Prices include both labour and materials.
What is the average cost of single storey extension in Grantham?
Single Storey Extension in Grantham costs between £12,600 and £34,200 on average, depending on the scope of work and materials chosen.
When is the cheapest time to hire a builder in Grantham?
Demand for builder work in Grantham is typically lowest in January. Booking during quieter months may mean better availability and competitive pricing.
Are builder prices in Grantham above or below the national average?
Builder prices in Grantham are around 10% below the national average, making it a more affordable area for this type of work.
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