Builder Costs in Hounslow
London | Modelled planning ranges | Base prices dated May 2026 | Includes labour and materials
Cost Calculator
Estimated cost in Hounslow
£18,340 - £49,780
Single Storey Extension (medium (15-25 sqm))
Typical duration: 6-12 weeks
Builder Prices in Hounslow
Single Storey Extension
£18,340 - £49,780Labour
£10,480 - £26,200
Materials
£7,860 - £23,580
Typical duration: 6-12 weeks
Garage Conversion
£8,515 - £19,650Labour
£5,240 - £11,790
Materials
£3,275 - £7,860
Typical duration: 2-4 weeks
Internal Wall Removal
£917 - £3,013Labour
£655 - £1,965
Materials
£262 - £1,048
Typical duration: 1-3 days
Patio Construction
£1,703 - £5,895Labour
£1,048 - £3,275
Materials
£655 - £2,620
Typical duration: 2-5 days
How Hounslow Compares
More expensive
Our model for Hounslow is 31% 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 Hounslow?
Builder prices in Hounslow typically range from £917 for internal wall removal to £49,780 for single storey extension. Prices include both labour and materials.
What is the average cost of single storey extension in Hounslow?
Single Storey Extension in Hounslow costs between £18,340 and £49,780 on average, depending on the scope of work and materials chosen.
When is the cheapest time to hire a builder in Hounslow?
Demand for builder work in Hounslow is typically lowest in January. Booking during quieter months may mean better availability and competitive pricing.
Are builder prices in Hounslow above or below the national average?
Builder prices in Hounslow are around 31% above the national average, reflecting higher local labour rates and cost of living.
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