South East regional pricing
How Much Does a Builder Cost in Spelthorne?
Updated prices for . Spelthorne prices are typically 12% above the national average.
Price summary
Spelthorne Price Summary
| Service | Low | Average | High |
|---|---|---|---|
| Single Storey Extension | £33,510 | £55,850 | £89,360 |
| Double Storey Extension | £55,850 | £94,945 | £156,380 |
| Loft Conversion | £27,925 | £50,265 | £83,775 |
Prices include labour and materials. VAT may apply. Based on South East regional pricing.
Full pricing
All Builder Prices in Spelthorne
Every price adjusted for Spelthorne using a 1.117x cost multiplier, rounded to the nearest £5.
| Job | Low | Average | High | Duration |
|---|---|---|---|---|
| Single Storey Extension | £33,510 | £55,850 | £89,360 | 8-12 weeks |
| Double Storey Extension | £55,850 | £94,945 | £156,380 | 12-20 weeks |
| Loft Conversion | £27,925 | £50,265 | £83,775 | 6-10 weeks |
| Garage Conversion | £8,935 | £16,755 | £27,925 | 2-4 weeks |
| Porch Build | £2,795 | £5,025 | £8,935 | 1-2 weeks |
| Garden Wall | £895 | £1,675 | £3,350 | 2-4 days |
| Knock Through Internal Wall | £1,115 | £2,010 | £3,910 | 2-4 days |
| Chimney Breast Removal | £1,340 | £2,235 | £3,910 | 2-4 days |
| Underpinning | £5,585 | £13,405 | £27,925 | 2-4 weeks |
| Damp Proof Course | £560 | £1,340 | £2,795 | 1-3 days |
| New Build Garage | £11,170 | £20,105 | £33,510 | 3-5 weeks |
| Outbuilding or Garden Room | £13,405 | £27,925 | £55,850 | 3-6 weeks |
| Structural Steelwork (RSJ Installation) | £1,115 | £2,010 | £3,350 | 1-2 days |
| Patio or Decking Build | £1,675 | £3,910 | £7,820 | 3-5 days |
Single Storey Extension
Low
£33,510
Average
£55,850
High
£89,360
8-12 weeks
Double Storey Extension
Low
£55,850
Average
£94,945
High
£156,380
12-20 weeks
Loft Conversion
Low
£27,925
Average
£50,265
High
£83,775
6-10 weeks
Garage Conversion
Low
£8,935
Average
£16,755
High
£27,925
2-4 weeks
Porch Build
Low
£2,795
Average
£5,025
High
£8,935
1-2 weeks
Garden Wall
Low
£895
Average
£1,675
High
£3,350
2-4 days
Knock Through Internal Wall
Low
£1,115
Average
£2,010
High
£3,910
2-4 days
Chimney Breast Removal
Low
£1,340
Average
£2,235
High
£3,910
2-4 days
Underpinning
Low
£5,585
Average
£13,405
High
£27,925
2-4 weeks
Damp Proof Course
Low
£560
Average
£1,340
High
£2,795
1-3 days
New Build Garage
Low
£11,170
Average
£20,105
High
£33,510
3-5 weeks
Outbuilding or Garden Room
Low
£13,405
Average
£27,925
High
£55,850
3-6 weeks
Structural Steelwork (RSJ Installation)
Low
£1,115
Average
£2,010
High
£3,350
1-2 days
Patio or Decking Build
Low
£1,675
Average
£3,910
High
£7,820
3-5 days
Regional comparison
How Spelthorne Compares
Average cost of single storey extension across regions.
Local insights
What Affects Builder Costs in Spelthorne?
The South East has a mix of housing styles, from Victorian and Edwardian semis to 1930s suburban developments and modern estates. In and around Spelthorne, many properties in areas near Surrey and Kent vary in age and condition. Older properties with original features typically cost more for builder work due to additional preparation and access challenges.
The South East sits above the national average for trade costs, influenced by proximity to London and the generally higher cost of living. Labour rates in Spelthorne are typically 12% above the UK average. Despite this, there's a strong supply of qualified builder professionals across the region. Prices can vary 30-50% between different tradespeople for the same job, so getting multiple quotes is essential.
What you pay for builder work in Spelthorne depends on the complexity of the job, the materials used, and the condition of your property. Older detached and semi-detached homes often present more challenges that add to the cost. For larger jobs, expect to pay £55,850 to £156,380 for double storey extension in Spelthorne. Coastal properties in the South East may face additional considerations that affect pricing.
When getting quotes in Spelthorne, aim for at least three from different qualified professionals. Ask each one to visit and assess the work rather than quoting over the phone. A good builder will check the existing setup, identify complications, and provide a detailed cost breakdown. Be wary of quotes that seem significantly cheaper — they may be cutting corners on materials or quality. Always check qualifications, insurance and recent reviews.
More services
Other Services in Spelthorne
Explore costs for other services in the Spelthorne area.
40 services — scroll to explore
UK-wide pricing
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Common questions
Frequently Asked Questions
Common questions about builder costs in Spelthorne.