House Extension
in Brighton
Compare quotes from vetted Brighton extension builders for single-storey, double-storey and rear extensions. Transparent pricing from £19,500. Free, no-obligation quotes — results in 24 hours.
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How Much Do House Extension Cost in Brighton?
Real prices from completed projects in Brighton and the surrounding area. Costs vary by size, specification and access — use these as a starting guide, then get 3 free quotes for your specific project.
The most popular choice for UK terraces and semis. Adds a kitchen-diner or extra living space at ground level. Typically 3–5m deep, completed in 10–14 weeks.
Get quotes for this →Maximum space gain in a single build — adds a ground-floor room and a bedroom above. Strong ROI in most UK property markets. Requires full planning permission.
Get quotes for this →Ideal for terraced homes with a narrow side alley. Transforms a cramped kitchen into a full-width open-plan space. Often combined with a rear extension.
Get quotes for this →Costs depend on size, spec and access. The best way to know your exact price is to compare 3 quotes from vetted local specialists.
Get free quotes →Brighton pricing note: South East England prices run 15–25% above the national average, particularly in Surrey, Kent and areas within commuter distance of London. Strong demand and limited contractor availability in peak season push costs higher. Prices shown are indicative ranges for Brighton and South East. Always get at least 3 written quotes before committing to any builder.
House Extension Specialists Who Know Brighton
Brighton is one of the UK's most active home renovation markets. With a diverse range of properties across the area, from period homes to modern new builds, local builders need to be versatile, skilled, and reliable.
BestBuilders vets every builder in our Brighton network. We check for public liability insurance, relevant trade qualifications (CIOB, FMB, Gas Safe, NICEIC), and a minimum of five verified customer reviews before any builder can appear on our platform.
Whether you are planning a rear extension, a loft conversion, or a full kitchen renovation in Brighton, we will connect you with the right specialist within 24 hours. All quotes are free and there is no obligation to proceed.
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What Brighton Homeowners Say About Our House Extension Specialists
Hip-end side extension on our Victorian terrace in Brighton. 24m² rear with structural opening through to the existing kitchen and a steel beam above. Total £44300 across 12 weeks on site. FMB-credentialed builder, structural calcs done in-house.
Compared four extension builders through BestBuilders for the Brighton job. Picked the firm whose CAD drawings showed every junction in 3D before signing. Permitted Development route confirmed via a Lawful Development Certificate before any digging. Total £80100 fully turnkey. Moved out for two weeks during the demolition and steel install, the rest was bearable.
A summer and a winter on, the new space holds temperature without the boiler kicking in. Builder we found via BestBuilders in Brighton specced higher-grade glazing than we asked for - winter heating bills are noticeably lower. Total £61560. Decided to stay rather than move - the extension solved the space problem entirely.
House Extension in Brighton — FAQs
Plan Your house extension Project in Brighton
Whether you're researching costs, checking planning rules, or comparing approaches before you commit, our editorial team has produced these guides to help Brighton homeowners make informed decisions about their house extension project.
House Extension Cost Guide
Detailed UK price ranges, regional adjustments and worked examples for house extension projects.
Read House Extension Cost Guide →All House Extension Specialists
Browse our nationwide network of vetted house extension contractors covering all 519 UK towns.
Browse House Extension Specialists →All Cost Guides
Compare prices across extensions, lofts, kitchens, bathrooms, roofing, driveways and solar projects.
View All Cost Guides →Planning your house extension project? Read these guides:
House Extension Near Brighton
We also connect homeowners with vetted house extension specialists in towns surrounding Brighton.
Planning Your House Extension in Brighton
Before you compare quotes, it's worth understanding the full UK price picture for house extension and how Brighton sits within it. The guides below cover average costs, what affects your quote, and how to choose a builder you can trust.
UK House Extension Cost Guide
Full price ranges, worked examples and the factors that move your quote — drawn from real project data across 519 UK towns.
Read the house extension cost guide →House Extension Across the UK
Browse house extension services nationwide, see what's typical in your region, and request quotes from any UK location.
Visit the UK house extension hub →Planning Permission for House Extension in Brighton
Find out whether your house extension needs planning permission in Brighton, what Permitted Development limits apply, and how rules differ in conservation areas, Article 4 zones, and listed-building settings.
Read the house extension planning rules →More homeowner resources: all UK building guides, cost guides, planning permission, comparisons, how-to guides and industry insights.