The 10 builders from Google's results for Cardiff, ranked on Google rating, online presence and other factors. Updated 10 September 2026.
Wales has run its own planning system since 2016 and permitted development rights differ from England.
on GoogleMill Farm House, Cardiff
Gentles Construction carries out domestic building work in Cardiff and the surrounding areas. Its project range encompasses new builds, single and multi-storey extensions, garage and loft conversions, brickwork, driveways and landscape gardening.
029 2120 0126 Unit 18, Mill Farm House, Cardiff CF14 0SH
on GoogleCardiff
Britton Construction is a Cardiff building firm that also works across South Wales and in Bristol. Its team lays brickwork and takes on house extensions, garage conversions, complete renovations and new builds, as well as updating older homes.
on GooglePenarth
McCann Builders covers Penarth, Cardiff and the Vale of Glamorgan, completing home extensions, loft conversions, brickwork, plastering and rendering. The team also fits kitchens and bathrooms, alongside handling roofing, plumbing and electrical work.
07774 104038 136 Redlands Rd, Penarth CF64 2WN
on GoogleCardiff
Mark James Building Contractors undertakes domestic and commercial projects throughout Cardiff and nearby locations. Work completed includes new builds, structural alterations, full property renovations, home extensions, kitchen refurbishments, and bathroom installations.
07718 688740 231 Cyncoed Rd, Cardiff CF23 6NY
on GoogleCardiff
AJW Construction provides domestic building work, property renovations, and extensions in Cardiff.
029 2022 1823 40A Richards St, Cardiff CF24 4DA
on GoogleCardiff
For Ty Builders provides residential construction services across Cardiff and nearby communities. The firm handles whole-project management for new builds, property renovations, home extensions, and loft conversions.
07817 269005 12 Celyn Grove, Cardiff CF23 6SH
on GoogleLlanrumney, Cardiff
RGB Construction undertakes various building projects in Cardiff, including bathroom fitting, kitchen installations, extensions, and loft conversions. Work covers dormer, Velux, mansard, and hip-to-gable conversions for local properties.
07946 452571 11 Watchet Cl, Llanrumney, Cardiff CF3 4DU
on GooglePark Road, Cardiff
Dragon Construction manages building projects from the initial design phase through to completion across Cardiff. The team specialises in home extensions, loft conversions, and residential refurbishments, utilising in-house architects and quantity surveyors.
029 2037 1341 Unit 1, the stone yard, canton Ninian, Park Road, Cardiff CF11 6HE
Cardiff
AJW Construction takes on building projects in and around Cardiff and elsewhere in South Wales. Its work spans domestic builds, renovations and extensions, carried out for local landlords as well as private homeowners, on jobs large and small.
Pontnewynydd Industrial Estate, Pontypool
Robinson Building delivers managed home improvement projects across Cardiff and South Wales. Its services include property extensions, structural conversions, full house renovations, kitchen and bathroom fitting, driveways, and general landscaping.
01495 740411 Pontnewynydd, Pontnewynydd Industrial Estate, Pontypool NP4 6AD
In Cardiff, small structural job typically costs £1,400 – £4,700. Labour in Cardiff runs 6% below the UK median, which accounts for most of the difference from the same job elsewhere.
These are the firms from Google's results for "builders cardiff". They are ranked on Google rating, online presence and other factors.
The figures above are Cardiff ranges. These explain what drives them, so you can read a quote properly.
Per-square-metre rates for light, standard and full renovations, prices job by job, rates by region, and the VAT, fees and contingency that sit on top of the build.
2026 prices for single and double garage conversions by garage type and room, what a quote should include, the fees and VAT around the build, and the rules in each UK nation.
Which jobs are notifiable, how the application routes work, what building control inspects, and what a completion certificate is worth when you come to sell.
For anything over about £10,000, yes. The JCT Home Owner contract is short, plain English and free to buy. It fixes the payment schedule and the process if things go wrong, which is exactly what an informal arrangement does not.
Materials up front is reasonable. A large percentage of the total is not. Stage payments against completed work are the norm, and a firm insisting on 50% before starting is a warning sign.