South East regional pricing
How Much Does a Builder Cost in Southampton?
Updated prices for . Southampton prices are typically 4% below the national average.
Price summary
Southampton Price Summary
| Service | Low | Average | High |
|---|---|---|---|
| Single Storey Extension | £28,860 | £48,100 | £76,960 |
| Double Storey Extension | £48,100 | £81,770 | £134,680 |
| Loft Conversion | £24,050 | £43,290 | £72,150 |
Prices include labour and materials. VAT may apply. Based on South East regional pricing.
Full pricing
All Builder Prices in Southampton
Every price adjusted for Southampton using a 0.962x cost multiplier, rounded to the nearest £5.
| Job | Low | Average | High | Duration |
|---|---|---|---|---|
| Single Storey Extension | £28,860 | £48,100 | £76,960 | 8-12 weeks |
| Double Storey Extension | £48,100 | £81,770 | £134,680 | 12-20 weeks |
| Loft Conversion | £24,050 | £43,290 | £72,150 | 6-10 weeks |
| Garage Conversion | £7,695 | £14,430 | £24,050 | 2-4 weeks |
| Porch Build | £2,405 | £4,330 | £7,695 | 1-2 weeks |
| Garden Wall | £770 | £1,445 | £2,885 | 2-4 days |
| Knock Through Internal Wall | £960 | £1,730 | £3,365 | 2-4 days |
| Chimney Breast Removal | £1,155 | £1,925 | £3,365 | 2-4 days |
| Underpinning | £4,810 | £11,545 | £24,050 | 2-4 weeks |
| Damp Proof Course | £480 | £1,155 | £2,405 | 1-3 days |
| New Build Garage | £9,620 | £17,315 | £28,860 | 3-5 weeks |
| Outbuilding or Garden Room | £11,545 | £24,050 | £48,100 | 3-6 weeks |
| Structural Steelwork (RSJ Installation) | £960 | £1,730 | £2,885 | 1-2 days |
| Patio or Decking Build | £1,445 | £3,365 | £6,735 | 3-5 days |
Single Storey Extension
Low
£28,860
Average
£48,100
High
£76,960
8-12 weeks
Double Storey Extension
Low
£48,100
Average
£81,770
High
£134,680
12-20 weeks
Loft Conversion
Low
£24,050
Average
£43,290
High
£72,150
6-10 weeks
Garage Conversion
Low
£7,695
Average
£14,430
High
£24,050
2-4 weeks
Porch Build
Low
£2,405
Average
£4,330
High
£7,695
1-2 weeks
Garden Wall
Low
£770
Average
£1,445
High
£2,885
2-4 days
Knock Through Internal Wall
Low
£960
Average
£1,730
High
£3,365
2-4 days
Chimney Breast Removal
Low
£1,155
Average
£1,925
High
£3,365
2-4 days
Underpinning
Low
£4,810
Average
£11,545
High
£24,050
2-4 weeks
Damp Proof Course
Low
£480
Average
£1,155
High
£2,405
1-3 days
New Build Garage
Low
£9,620
Average
£17,315
High
£28,860
3-5 weeks
Outbuilding or Garden Room
Low
£11,545
Average
£24,050
High
£48,100
3-6 weeks
Structural Steelwork (RSJ Installation)
Low
£960
Average
£1,730
High
£2,885
1-2 days
Patio or Decking Build
Low
£1,445
Average
£3,365
High
£6,735
3-5 days
Regional comparison
How Southampton Compares
Average cost of single storey extension across regions.
Local insights
What Affects Builder Costs in Southampton?
The South East has a mix of housing styles, from Victorian and Edwardian semis to 1930s suburban developments and modern estates. In and around Southampton, 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 Southampton are typically 4% below 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 Southampton 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 £48,100 to £134,680 for double storey extension in Southampton. Coastal properties in the South East may face additional considerations that affect pricing.
When getting quotes in Southampton, 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 Southampton
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UK-wide pricing
Builder Costs in Other Cities
Compare builder prices across the UK.
Common questions
Frequently Asked Questions
Common questions about builder costs in Southampton.