Are you a builder business in South Cardiff? Get a featured spot above the Top 5 and be seen first.
New businesses get 25% off their first 6 months.
Enquire about featuring →An established Cardiff building firm based on Richards Street, Cathays (CF24), handling general building, extensions, garage and loft conversions, kitchens and bathrooms across South Cardiff — a genuinely local independent.
A Cardiff firm offering building, plumbing and electrical services across Cardiff Bay, Grangetown, Canton, Cathays and Riverside — a genuinely local independent.
A leading loft conversion and home extension specialist with over 22 years' experience, covering Grangetown, Cathays and South Cardiff — a genuinely local independent.
A domestic building firm completing loft conversions, home renovations and house extensions across Cardiff including South Cardiff — a genuinely local independent.
A Cardiff building firm offering fully managed loft conversions, cladding and roofing across South Cardiff — a genuinely local independent.
How we chose the top 5 builders in South Cardiff
Every business on this page earned its place through independent research. We look at where companies rank organically on Google, the volume and quality of their reviews, ratings and verification across platforms like Checkatrade, Which? Trusted Traders and TrustATrader, relevant trade accreditations, and the kind of word-of-mouth and social proof that's hard to fake. No business can pay to appear in this organic Top 5 — the list is earned and reviewed regularly.
If you're comparing builders in South Cardiff, any of the five above is a sound starting point. We'd still recommend getting more than one quote and confirming current availability and accreditations directly with the business before you book.
Finding a good builder in South Cardiff
South Cardiff has a healthy mix of independent tradespeople and small local firms, and as anywhere, quality varies. Every business on this page earned its place through independent research — online reputation, verified reviews, local trading evidence and professional credentials — and none of them paid to appear.
Building work is the biggest investment of any trade here, so look for a builder registered with a recognised body such as the Federation of Master Builders (FMB), fully insured, and able to show recent projects and references. Always get a detailed written quote and a clear schedule.
What do South Cardiff builders cover?
Most builders in South Cardiff also cover City Centre, Cardiff Bay, Butetown, Grangetown, Riverside, Splott, Adamsdown and Cathays. Coverage varies by business, so it's always worth confirming your postcode when you make an enquiry.
Typical jobs include extensions, renovations, new builds and structural work — and most offer free quotes for larger work.
Frequently asked questions
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