Builder Costs in St Albans
South East | Prices updated for 2026 | All estimates include labour and materials
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Estimated cost in St Albans
£17,780 - £48,260
Single Storey Extension (medium (15-25 sqm))
Typical duration: 6-12 weeks
Builder Prices in St Albans
Single Storey Extension
£17,780 - £48,260Labour
£10,160 - £25,400
Materials
£7,620 - £22,860
Typical duration: 6-12 weeks
Garage Conversion
£8,255 - £19,050Labour
£5,080 - £11,430
Materials
£3,175 - £7,620
Typical duration: 2-4 weeks
Internal Wall Removal
£889 - £2,921Labour
£635 - £1,905
Materials
£254 - £1,016
Typical duration: 1-3 days
Patio Construction
£1,651 - £5,715Labour
£1,016 - £3,175
Materials
£635 - £2,540
Typical duration: 2-5 days
How St Albans Compares
More expensive
Trade prices in St Albans are typically 27% above the national average. This reflects local labour rates and the cost of living in South East.
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 St Albans?
Builder prices in St Albans typically range from £889 for internal wall removal to £48,260 for single storey extension. Prices include both labour and materials.
What is the average cost of single storey extension in St Albans?
Single Storey Extension in St Albans costs between £17,780 and £48,260 on average, depending on the scope of work and materials chosen.
When is the cheapest time to hire a builder in St Albans?
Demand for builder work in St Albans is typically lowest in January. Booking during quieter months may mean better availability and competitive pricing.
Are builder prices in St Albans above or below the national average?
Builder prices in St Albans are around 27% above the national average, reflecting higher local labour rates and cost of living.
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