Extension building costs in Brighton vary significantly based on project scope, materials, structural complexity, and current labour availability. As a sought-after south coast location with rising property values, Brighton commands premium rates for skilled builders. Whether you're planning a single-storey rear extension, a loft conversion, or a more ambitious two-storey project, understanding typical costs helps you budget effectively. BizHub365 connects Brighton homeowners with vetted, local extension builders who deliver quality results on time and within budget.
Extension Builder Prices in Brighton
| Service | Typical Cost | Unit |
|---|---|---|
| Single-storey rear extension (up to 20m²) | £18000 – £32000 | per project |
| Single-storey side extension (up to 15m²) | £15000 – £28000 | per project |
| Two-storey extension (up to 40m²) | £45000 – £75000 | per project |
| Loft conversion (up to 30m²) | £25000 – £50000 | per project |
| Builder labour (skilled) | £150 – £250 | per day |
| Structural engineer survey & design | £600 – £1200 | per project |
| Building Control approval & inspection | £400 – £900 | per project |
| Groundwork & foundation preparation | £3000 – £8000 | per project |
Prices are indicative averages for Brighton. Actual quotes will vary based on job specifics.
What Affects the Cost?
Extension building costs in Brighton are shaped by several critical factors. Project complexity—including roof design, structural modifications, and whether load-bearing walls need moving—significantly impacts pricing. Material choices (brick, block, render finishes) and specification standards (insulation, windows, internal finishes) directly affect total spend. Brighton's desirable location and skilled labour market add 25–35% to national averages. Ground conditions, existing property access, and planning permission requirements also influence timescales and costs. Seasonal demand fluctuations are common; summer projects often attract higher quotes.
Money-Saving Tips
Obtain 2–3 competitive quotes before committing. Consider phasing projects to spread costs. Simplify designs where possible—avoiding complex rooflines and unusual shapes reduces both labour and material expenses. Prepare your site in advance (clear access, arrange utilities) to minimise builder downtime and accelerate timescales, directly reducing labour costs.
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