Abergavenny ยท House Extension

House Extension
in Abergavenny

Compare quotes from vetted Abergavenny extension builders for single-storey, double-storey and rear extensions. Transparent pricing from ยฃ14,500. Free, no-obligation quotes โ€” results in 24 hours.

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Vetted House Extension Specialists
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Local Abergavenny Experts
35+
House Extension Specialists in Abergavenny
4.6
Average Star Rating
140+
Projects Completed in Abergavenny
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How Much Do House Extension Cost in Abergavenny?

Real prices from completed projects in Abergavenny and the surrounding area. Costs vary by size, specification and access โ€” use these as a starting guide, then get 3 free quotes for your specific project.

Full cost guide โ†’
Single-storey extension
Rear or Side-Return Extension
£ 22,000 โ€“ £44,000

The most popular choice for UK terraces and semis. Adds a kitchen-diner or extra living space at ground level. Typically 3โ€“5m deep, completed in 10โ€“14 weeks.

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Double-storey extension
Full Double-Storey Rear Extension
£ 44,000 โ€“ £79,000

Maximum space gain in a single build โ€” adds a ground-floor room and a bedroom above. Strong ROI in most UK property markets. Requires full planning permission.

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Side Extension
Side-Return or Infill Extension
£ 14,500 โ€“ £33,000

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.

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Your Project
Get an Accurate Quote

Costs depend on size, spec and access. The best way to know your exact price is to compare 3 quotes from vetted local specialists.

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Abergavenny pricing note: South Wales building costs run 10โ€“15% below the national average, making it one of the most affordable regions in the UK for home improvements. Cardiff and Newport are well-served by vetted local contractors. Prices shown are indicative ranges for Abergavenny and South Wales. Always get at least 3 written quotes before committing to any builder.

House Extension Specialists Who Know Abergavenny

Home renovation activity in Abergavenny continues to grow year on year. The area's varied housing stock, from older stone-built properties to new-build estates, means there is always strong demand for skilled, experienced local builders.

Before any builder appears on our Abergavenny platform, we carry out a full vetting check covering public liability insurance, trade qualifications, company registration and verified customer feedback. Only builders who pass every stage are listed.

Our Abergavenny builder network covers extensions, loft conversions, kitchens, bathrooms, roofing, driveways and more. Get up to 3 free, no-obligation quotes within 24 hours and choose the builder that best fits your project and budget.

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How It Works

1
Tell us your project
Describe your house extension project and postcode. Takes 60 seconds.
2
We match you instantly
We send your brief to up to 3 vetted house extension specialists in Abergavenny.
3
Compare and choose
Review quotes, profiles and reviews. No obligation to proceed.

Every Builder We Recommend Is:

โœ“ Minimum ยฃ2m public liability insurance โ€” verified before listing
โœ“ Holds relevant trade qualifications (FMB, CIOB, FMB, CIOB)
โœ“ Has a minimum of 5 verified customer reviews before joining
โœ“ Actively monitored โ€” removed for sustained negative feedback

What Abergavenny Homeowners Say About Our House Extension Specialists

โ˜…โ˜…โ˜…โ˜…โ˜… 4.6 / 5
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Wraparound extension on our 1930s semi in Abergavenny. Glazed corner of the extension brings southerly daylight deep into the plan. ยฃ125920 fully turnkey, 18 weeks. Trial pit done day one to confirm foundation depth was workable.

Eden H.
Abergavenny
House Extension
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Compared four extension builders through BestBuilders for the Abergavenny job. Highest-priced quote actually had the cheapest spec - the breakdown made it obvious. Builder agreed staged payments against milestones - cash-flow clarity throughout. ยฃ74400 all-in over 13 weeks. EPC went up two bands thanks to the new spec.

Yusuf L.
Abergavenny
House Extension
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A year in, the underfloor heating runs the new space at zero heating cost from solar. Builder we found via BestBuilders in Abergavenny pointed out a future planning issue and designed around it pre-emptively. Total ยฃ67020. Stamp duty saved by extending out rather than moving up.

Yusuf R.
Abergavenny
House Extension

House Extension in Abergavenny โ€” FAQs

Builder day rates in Abergavenny typically range from ยฃ150 to ยฃ320 per day depending on the trade and project type. A single-storey extension typically costs ยฃ22,000 to ยฃ44,000 in Abergavenny. Get 3 free quotes to compare accurate prices for your specific project.
Many home extensions in Abergavenny fall under Permitted Development rights, meaning planning permission is not required. However, you will need to apply to the local planning authority if your property is listed, in a conservation area, or if the extension exceeds permitted development size limits. Our builders can advise during your free quote.
Through BestBuilders, you will typically receive your first quotes within 24 to 48 hours. Most Abergavenny builders in our network can begin projects within 2 to 8 weeks, depending on the time of year and project size. Summer is the busiest season so booking earlier is advisable.
Yes. Every builder in our Abergavenny network is vetted before joining. We verify public liability insurance (minimum ยฃ2m cover), trade qualifications, company registration and a minimum of 5 verified customer reviews. Builders with a sustained pattern of negative feedback are removed from the platform.
Autumn and winter are generally the best times to hire builders in Abergavenny as demand is lower and you may have more flexibility on price and start dates. Spring and summer are peak season with longer waiting times. That said, quality builders in Abergavenny stay busy year-round.

Plan Your house extension Project in Abergavenny

Whether you're researching costs, checking planning rules, or comparing approaches before you commit, our editorial team has produced these guides to help Abergavenny 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.

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All House Extension Specialists

Browse our nationwide network of vetted house extension contractors covering all 519 UK towns.

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All Cost Guides

Compare prices across extensions, lofts, kitchens, bathrooms, roofing, driveways and solar projects.

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Planning your house extension project? Read these guides:

House Extension Near Abergavenny

We also connect homeowners with vetted house extension specialists in towns surrounding Abergavenny.

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Planning Your House Extension in Abergavenny

Before you compare quotes, it's worth understanding the full UK price picture for house extension and how Abergavenny 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 โ€” drawn from real project data across 519 UK towns.

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House Extension Across the UK

Browse house extension services nationwide, see what's typical in your region, and request quotes from any UK location.

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Planning Permission for House Extension in Abergavenny

Find out whether your house extension needs planning permission in Abergavenny, 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 โ†’

More homeowner resources: all UK building guides, cost guides, planning permission, comparisons, how-to guides and industry insights.

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Tell us about your project and we'll match you with 3 vetted house extension specialists in Abergavenny. Free, no-obligation, no spam โ€” results in 24 hours.