House Extension
in Derby
Compare quotes from vetted Derby extension builders for single-storey, double-storey and rear extensions. Transparent pricing from £16,500. Free, no-obligation quotes — results in 24 hours.
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How Much Do House Extension Cost in Derby?
Real prices from completed projects in Derby 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 →Derby pricing note: East Midlands building costs are broadly in line with the national average. Prices in Nottingham, Leicester and Derby are competitive, with good availability of vetted local contractors across the region. Prices shown are indicative ranges for Derby and East Midlands. Always get at least 3 written quotes before committing to any builder.
House Extension Specialists Who Know Derby
Derby 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 Derby 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 Derby, 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 Derby Homeowners Say About Our House Extension Specialists
Brick-faced single-storey extension on our Victorian terrace in Derby. Two-storey gain - utility on the ground, en-suite bedroom on the first. Cavity-tray detail done properly. Total £45350 across 12 weeks on site. FMB-credentialed builder, structural calcs done in-house.
Compared four extension builders through BestBuilders for the Derby job. Chose on the strength of seeing a finished extension in the next street. Permitted Development route confirmed via a Lawful Development Certificate before any digging. Came in £2145 under quote because the foundations were shallower than feared. Moved out for two weeks during the demolition and steel install, the rest was bearable.
Two years on, the lantern roof is still pristine - no water staining at all. Builder we found via BestBuilders in Derby specced higher-grade glazing than we asked for - winter heating bills are noticeably lower. Total £62820. Decided to stay rather than move - the extension solved the space problem entirely.
House Extension in Derby — FAQs
Plan Your house extension Project in Derby
Whether you're researching costs, checking planning rules, or comparing approaches before you commit, our editorial team has produced these guides to help Derby 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:
Planning Your House Extension in Derby
Before you compare quotes, it's worth understanding the full UK price picture for house extension and how Derby 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 Derby
Find out whether your house extension needs planning permission in Derby, 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.