Loft Conversion
in Cardiff
Compare quotes from vetted Cardiff loft conversion specialists. Dormer, Velux, hip-to-gable and mansard conversions from £30,000. Free no-obligation quotes.
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How Much Do Loft Conversion Cost in Cardiff?
Real prices from completed projects in Cardiff 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 type in the UK. Creates a full-height room with a vertical rear wall and flat roof. Usually includes a bathroom and Velux windows to the front.
Get quotes for this →Ideal for end-of-terrace and detached homes with a hipped roof. Extends the ridge line to create maximum usable floor space. Often paired with a rear dormer.
Get quotes for this →The most spacious conversion type — a near-vertical rear wall with a shallow-pitched roof. Common in London and city terraces. Typically requires planning permission.
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 →Cardiff 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 Cardiff and South Wales. Always get at least 3 written quotes before committing to any builder.
Loft Conversion Specialists Who Know Cardiff
Home renovation activity in Cardiff 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 Cardiff 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 Cardiff 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 Cardiff Homeowners Say About Our Loft Conversion Specialists
Hip-to-gable plus rear dormer on our Victorian terrace in Cardiff. Turned dead attic into a master suite with en-suite, two Velux rooflights and built-in eaves storage. Total £38400 over 11 weeks on site. FMB-credentialed builder, party wall agreement handled in-house.
Used BestBuilders to find a loft specialist near Cardiff - comparing the breakdowns side by side made the decision obvious. Builder did the structural drawings and party wall notices in-house. Lived in throughout - they tarp'd the staircase opening every night. Final bill £42560. Survey showed the loft added £62k to the valuation.
Two summers later, the eaves storage has been a game-changer for tidying up. Builder we found via BestBuilders in Cardiff recommended a slightly larger dormer than we asked for - they were right. Total £45640. Estate agent valued the conversion at +£75k. ROI obvious.
Loft Conversion in Cardiff — FAQs
Plan Your loft conversion Project in Cardiff
Whether you're researching costs, checking planning rules, or comparing approaches before you commit, our editorial team has produced these guides to help Cardiff homeowners make informed decisions about their loft conversion project.
Loft Conversion Cost Guide
Detailed UK price ranges, regional adjustments and worked examples for loft conversion projects.
Read Loft Conversion Cost Guide →All Loft Conversion Specialists
Browse our nationwide network of vetted loft conversion contractors covering all 519 UK towns.
Browse Loft Conversion Specialists →All Cost Guides
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View All Cost Guides →Planning your loft conversion project? Read these guides:
Planning Your Loft Conversion in Cardiff
Before you compare quotes, it's worth understanding the full UK price picture for loft conversion and how Cardiff sits within it. The guides below cover average costs, what affects your quote, and how to choose a builder you can trust.
UK Loft Conversion 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 loft conversion cost guide →Loft Conversion Across the UK
Browse loft conversion services nationwide, see what's typical in your region, and request quotes from any UK location.
Visit the UK loft conversion hub →Planning Permission for Loft Conversion in Cardiff
Find out whether your loft conversion needs planning permission in Cardiff, what Permitted Development limits apply, and how rules differ in conservation areas, Article 4 zones, and listed-building settings.
Read the loft conversion planning rules →More homeowner resources: all UK building guides, cost guides, planning permission, comparisons, how-to guides and industry insights.