Builder Costs in Horsham
South East | Modelled planning ranges | Base prices dated May 2026 | Includes labour and materials
Cost Calculator
Estimated cost in Horsham
£16,520 - £44,840
Single Storey Extension (medium (15-25 sqm))
Typical duration: 6-12 weeks
Builder Prices in Horsham
Single Storey Extension
£16,520 - £44,840Labour
£9,440 - £23,600
Materials
£7,080 - £21,240
Typical duration: 6-12 weeks
Garage Conversion
£7,670 - £17,700Labour
£4,720 - £10,620
Materials
£2,950 - £7,080
Typical duration: 2-4 weeks
Internal Wall Removal
£826 - £2,714Labour
£590 - £1,770
Materials
£236 - £944
Typical duration: 1-3 days
Patio Construction
£1,534 - £5,310Labour
£944 - £2,950
Materials
£590 - £2,360
Typical duration: 2-5 days
How Horsham Compares
More expensive
Our model for Horsham is 18% above 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
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Frequently Asked Questions
How much does a builder cost in Horsham?
Builder prices in Horsham typically range from £826 for internal wall removal to £44,840 for single storey extension. Prices include both labour and materials.
What is the average cost of single storey extension in Horsham?
Single Storey Extension in Horsham costs between £16,520 and £44,840 on average, depending on the scope of work and materials chosen.
When is the cheapest time to hire a builder in Horsham?
Demand for builder work in Horsham is typically lowest in January. Booking during quieter months may mean better availability and competitive pricing.
Are builder prices in Horsham above or below the national average?
Builder prices in Horsham are around 18% above the national average, reflecting higher local labour rates and cost of living.
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