House Extension
in Llanelli
Compare quotes from vetted Llanelli extension builders for single-storey, double-storey and rear extensions. Transparent pricing from £14,500. Free, no-obligation quotes — results in 24 hours.
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How Much Do House Extension Cost in Llanelli?
Real prices from completed projects in Llanelli 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 →Llanelli pricing note: South Wales building costs run 10–15% 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 Llanelli and South Wales. Always get at least 3 written quotes before committing to any builder.
House Extension Specialists Who Know Llanelli
Home renovation activity in Llanelli 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 Llanelli 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 Llanelli 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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What Llanelli Homeowners Say About Our House Extension Specialists
Steel-framed wraparound on our 1990s semi in Llanelli. Glazed corner of the extension brings southerly daylight deep into the plan. £124360 fully turnkey, 18 weeks. Full insurance-backed warranty in writing on the structural works.
Compared four extension builders through BestBuilders for the Llanelli job. Chose the design-and-build option for single-point accountability. Skip changeovers booked for weekends so the front road was clear weekdays. £73200 all-in over 13 weeks. Insurance happy with the structural certificate.
Two summers in, the threshold detail still drains perfectly with no puddling. Builder we found via BestBuilders in Llanelli recommended a slightly different bi-fold layout - the threshold flow is much better. Total £65760. Family logistics transformed - everyone has space to themselves.
House Extension in Llanelli — FAQs
Plan Your house extension Project in Llanelli
Whether you're researching costs, checking planning rules, or comparing approaches before you commit, our editorial team has produced these guides to help Llanelli 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 Llanelli
Before you compare quotes, it's worth understanding the full UK price picture for house extension and how Llanelli 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 Llanelli
Find out whether your house extension needs planning permission in Llanelli, 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.