House Extension
in Plymouth
Compare quotes from vetted Plymouth extension builders for single-storey, double-storey and rear extensions. Transparent pricing from £15,000. Free, no-obligation quotes — results in 24 hours.
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How Much Do House Extension Cost in Plymouth?
Real prices from completed projects in Plymouth 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 →Plymouth pricing note: South West England (Bristol, Devon, Cornwall) varies significantly by location. Bristol prices sit near the national average; rural Devon and Cornwall can run 5–10% higher due to contractor travel costs and limited local trade availability. Prices shown are indicative ranges for Plymouth and South West. Always get at least 3 written quotes before committing to any builder.
House Extension Specialists Who Know Plymouth
Plymouth 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 Plymouth 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 Plymouth 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 Plymouth Homeowners Say About Our House Extension Specialists
Full-width rear extension on our Victorian terrace in Plymouth. 24m² rear with structural opening through to the existing kitchen and a steel beam above. Total £44650 across 12 weeks on site. FMB-credentialed builder, structural calcs done in-house.
Compared four extension builders through BestBuilders for the Plymouth job. Mid-tier quote of £61220 won on the proper cavity tray detail. Permitted Development route confirmed via a Lawful Development Certificate before any digging. Total £80550 fully turnkey. Moved out for two weeks during the demolition and steel install, the rest was bearable.
Nine months in and the rooflight has not leaked a drop, even in heavy rain. Builder we found via BestBuilders in Plymouth specced higher-grade glazing than we asked for - winter heating bills are noticeably lower. Total £61980. Decided to stay rather than move - the extension solved the space problem entirely.
House Extension in Plymouth — FAQs
Plan Your house extension Project in Plymouth
Whether you're researching costs, checking planning rules, or comparing approaches before you commit, our editorial team has produced these guides to help Plymouth 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 Plymouth
We also connect homeowners with vetted house extension specialists in towns surrounding Plymouth.
Planning Your House Extension in Plymouth
Before you compare quotes, it's worth understanding the full UK price picture for house extension and how Plymouth 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 Plymouth
Find out whether your house extension needs planning permission in Plymouth, 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.