The 10 loft conversions 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 GoogleEarlswood Rd, Cardiff
Jamie Burley Group carries out loft conversions, home extensions, and roofing work across Cardiff and South Wales. Its services include pitched roofing, flat roof installations, Velux window fitting, and initial drone surveys.
029 2074 7473 Cwrt Y Parc, Earlswood Rd, Cardiff CF14 5GH
on GoogleCardiff
iBuild carries out residential loft conversions and home extensions across Cardiff, the Valleys, and South Wales. Its builders oversee projects from concept and design through to final completion.
on GoogleCardiff
Cjames Construction carries out domestic and commercial building projects throughout the Cardiff region. The company constructs house extensions, new builds and loft conversions alongside general home renovations.
on GoogleCardiff
Starlight Loft Conversions provides attic conversion services for homeowners in Cardiff and across South Wales. The team works to create extra room within residential roof spaces while minimising household disruption.
on GoogleRobertstown Business Park, Aberdare
Loft Pro constructs attic transformations for residential properties throughout Cardiff, South Wales, and the West. The team handles initial design work, planning permission applications, and building control approval.
029 2062 8387 Unit 13, Robertstown Business Park, Aberdare CF44 8EZ
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 GoogleTaff's Well, Cardiff
Gallery Loft Conversions delivers attic extensions across South Wales and the West, serving areas from Swansea to Bristol. The company creates bedrooms, playrooms, home offices, and bathrooms, handling everything from initial design to final decoration.
029 2081 0425 JR House, Moy Road Industrial Estate, Taff's Well, Cardiff CF15 7QR
Cardiff
Sky Blue Lofts alters attic space for homeowners in Cardiff, Swansea, Bridgend, and Cowbridge. The team converts unused roof areas into master bedrooms with walk-in wardrobes, bathrooms, home offices, or entertainment rooms.
Cardiff
Cardiff and Vale Group carries out loft conversions for homes in Cardiff and across South Wales. Its website sets out the planning permission, costs and design choices involved in turning an unused attic into a bedroom or home office.
Cardiff
Loft Conversion Cardiff carries out loft conversions in the Cardiff area.
In Cardiff, velux / rooflight typically costs £23,500 – £33,000. 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 "loft conversion 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.
Loft conversion prices by type for 2026, including VAT, with London figures, the fees and extras a builder's quote leaves out, and when planning permission applies.
When a loft conversion needs planning permission in England, the 40 and 50 cubic metre limits for dormers, what a certificate costs, and the rules in Wales, Scotland and Northern Ireland.
What a dormer loft conversion costs in 2026, the dormer types, whether your loft has the height, the planning and building regulations rules in each nation, and how long it takes.
Usually not. Most fall under permitted development if you stay within 40 cubic metres for a terrace or 50 for a semi or detached, do not go above the existing roof ridge, and use materials in keeping. Mansards and anything on a flat or in a conservation area normally do need permission.
Six to eight weeks for a dormer once work starts, plus four to eight weeks beforehand for drawings, structural calculations and building control. Scaffolding usually goes up a week ahead.