House Extension
in Cambridge
Compare quotes from vetted Cambridge 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 Cambridge?
Real prices from completed projects in Cambridge 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 →Cambridge pricing note: Eastern England (Essex, Hertfordshire, Cambridgeshire, Suffolk, Norfolk) runs approximately 8–12% above the national average, influenced by proximity to London and strong demand in commuter towns. Prices shown are indicative ranges for Cambridge and Eastern. Always get at least 3 written quotes before committing to any builder.
House Extension Specialists Who Know Cambridge
Cambridge 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 Cambridge 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 Cambridge 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 Cambridge Homeowners Say About Our House Extension Specialists
Glazed rear extension on our 1960s detached in Cambridge. 36m² split between dining space and a snug, with a window seat over the new radiators. Final cost £65200 fully fitted out. Permitted Development under the larger home extension scheme - no full planning application.
Compared four extension builders through BestBuilders for the Cambridge job. Final pick included a 12-month aftercare visit as standard. Structural engineer report and party wall award all coordinated through one contact. £71200 all-in over 13 weeks. Snagging list closed within 14 days of completion handover.
Past 18 months and the engineered oak floor has bedded in beautifully. Builder we found via BestBuilders in Cambridge pushed back on our paving choice and saved us £2k on something more durable. Total £67860. Already used them again for the loft.
House Extension in Cambridge — FAQs
Plan Your house extension Project in Cambridge
Whether you're researching costs, checking planning rules, or comparing approaches before you commit, our editorial team has produced these guides to help Cambridge 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 Cambridge
We also connect homeowners with vetted house extension specialists in towns surrounding Cambridge.
Planning Your House Extension in Cambridge
Before you compare quotes, it's worth understanding the full UK price picture for house extension and how Cambridge 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 Cambridge
Find out whether your house extension needs planning permission in Cambridge, 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.