House Extension
in High Wycombe
Compare quotes from vetted High Wycombe extension builders for single-storey, double-storey and rear extensions. Transparent pricing from £19,500. Free, no-obligation quotes — results in 24 hours.
- Vetted, insured house extension specialists in High Wycombe
- Up to 3 free quotes — compare and choose with no pressure
- Transparent pricing, no hidden costs or surprise charges
- Work guaranteed, fully insured, trade-qualified contractors
How Much Do House Extension Cost in High Wycombe?
Real prices from completed projects in High Wycombe 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 →High Wycombe 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 High Wycombe and South East. Always get at least 3 written quotes before committing to any builder.
House Extension Specialists Who Know High Wycombe
High Wycombe 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 High Wycombe 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 High Wycombe, we will connect you with the right specialist within 24 hours. All quotes are free and there is no obligation to proceed.
Start My Free Quote →How It Works
Every Builder We Recommend Is:
What High Wycombe Homeowners Say About Our House Extension Specialists
Wraparound extension on our cottage in High Wycombe. 32m² extension with full-height glazing, underfloor heating throughout the new floor area. Came in £2620 under quote thanks to a simpler foundation. Building control sign-off on the first inspection.
Compared four extension builders through BestBuilders for the High Wycombe job. Highest-priced quote actually had the cheapest spec - the breakdown made it obvious. Internal openings cut on a Saturday so the rest of the family was barely disturbed. £70400 fitted, 12-week site programme. Lived in throughout - dust kept to the construction zone, never the rest of the house.
A year in, the underfloor heating runs the new space at zero heating cost from solar. Builder we found via BestBuilders in High Wycombe suggested moving the boiler to the new utility room - much quieter at night now. Total £73320. Estate agent valued the work at +£90k.
House Extension in High Wycombe — FAQs
Plan Your house extension Project in High Wycombe
Whether you're researching costs, checking planning rules, or comparing approaches before you commit, our editorial team has produced these guides to help High Wycombe 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 High Wycombe
We also connect homeowners with vetted house extension specialists in towns surrounding High Wycombe.
Planning Your House Extension in High Wycombe
Before you compare quotes, it's worth understanding the full UK price picture for house extension and how High Wycombe 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 High Wycombe
Find out whether your house extension needs planning permission in High Wycombe, 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.