House Extension
in Eastleigh
Compare quotes from vetted Eastleigh extension builders for single-storey, double-storey and rear extensions. Transparent pricing from £17,500. Free, no-obligation quotes — results in 24 hours.
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How Much Do House Extension Cost in Eastleigh?
Real prices from completed projects in Eastleigh 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 →Eastleigh pricing note: Southern England (Hampshire, Dorset, West Sussex) sits around 10–15% above the national average. Coastal locations and areas with restricted site access can attract additional charges from contractors. Prices shown are indicative ranges for Eastleigh and Southern. Always get at least 3 written quotes before committing to any builder.
House Extension Specialists Who Know Eastleigh
Eastleigh has a thriving home improvement market driven by a strong local economy and a mix of Victorian terraces, post-war housing and contemporary developments. Finding the right builder is key to any successful project.
Every builder in our Eastleigh network is thoroughly vetted before joining BestBuilders. We verify insurance cover, check trade memberships with bodies such as the FMB and CIOB, and require a minimum of five real customer reviews.
From a small bathroom refurbishment to a major double-storey extension, our vetted Eastleigh builders cover the full range of residential projects. Request your free quotes today and compare options before making any decisions.
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What Eastleigh Homeowners Say About Our House Extension Specialists
Side-return infill extension on our mid-terrace in Eastleigh. 40m² open-plan family room with sliding doors out to the garden. Final figure £100920 fully fitted out. Party wall agreement handled by their consultant - smooth process.
Compared four extension builders through BestBuilders for the Eastleigh job. Two FMB-affiliated builders, two not. Went with the one whose references checked out best. CDM regs followed properly - principal designer and contractor roles defined in writing. Came to £76920 fitted plus the £668 party wall fee. Daily 5pm site walk with the foreman, weekly progress on the spreadsheet.
Three years on, EPC went from D to B thanks to the spec they used. Builder we found via BestBuilders in Eastleigh integrated MVHR ducting into the new ceiling void - no soffit boxes needed. Total £85080. Insurance happy with the building control completion certificate.
House Extension in Eastleigh — FAQs
Plan Your house extension Project in Eastleigh
Whether you're researching costs, checking planning rules, or comparing approaches before you commit, our editorial team has produced these guides to help Eastleigh 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 Eastleigh
We also connect homeowners with vetted house extension specialists in towns surrounding Eastleigh.
Planning Your House Extension in Eastleigh
Before you compare quotes, it's worth understanding the full UK price picture for house extension and how Eastleigh 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 Eastleigh
Find out whether your house extension needs planning permission in Eastleigh, 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.