Builder Costs in Southwark
London | Modelled planning ranges | Base prices dated May 2026 | Includes labour and materials
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Estimated cost in Southwark
£18,900 - £51,300
Single Storey Extension (medium (15-25 sqm))
Typical duration: 6-12 weeks
Builder Prices in Southwark
Single Storey Extension
£18,900 - £51,300Labour
£10,800 - £27,000
Materials
£8,100 - £24,300
Typical duration: 6-12 weeks
Garage Conversion
£8,775 - £20,250Labour
£5,400 - £12,150
Materials
£3,375 - £8,100
Typical duration: 2-4 weeks
Internal Wall Removal
£945 - £3,105Labour
£675 - £2,025
Materials
£270 - £1,080
Typical duration: 1-3 days
Patio Construction
£1,755 - £6,075Labour
£1,080 - £3,375
Materials
£675 - £2,700
Typical duration: 2-5 days
How Southwark Compares
More expensive
Our model for Southwark is 35% 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
Builder Profiles Near Southwark
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Frequently Asked Questions
How much does a builder cost in Southwark?
Builder prices in Southwark typically range from £945 for internal wall removal to £51,300 for single storey extension. Prices include both labour and materials.
What is the average cost of single storey extension in Southwark?
Single Storey Extension in Southwark costs between £18,900 and £51,300 on average, depending on the scope of work and materials chosen.
When is the cheapest time to hire a builder in Southwark?
Demand for builder work in Southwark is typically lowest in January. Booking during quieter months may mean better availability and competitive pricing.
Are builder prices in Southwark above or below the national average?
Builder prices in Southwark are around 35% above the national average, reflecting higher local labour rates and cost of living.
Builder prices in nearby towns
Other trade prices in Southwark
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