Transforming Cardiff attics into luxury master suites, home offices, and extra bedrooms. From Roath and Pontcanna terraces to Heath and Cyncoed family homes — built with 25+ years' construction excellence.
Cardiff's diverse architectural heritage offers incredible potential for loft conversions. From the tall, steep Victorian and Edwardian pitched roofs of Canton, Roath, Pontcanna, and Cathays to the generous 1930s semis of Rhiwbina, Whitchurch, and Heath, converting your loft is the smartest way to add high-value habitable space without sacrificing garden area.
At All Aspects CDF LTD, we provide end-to-end design and build management. We navigate Cardiff Council planning, Welsh Permitted Development regulations, and full Building Control compliance from day one. Also see our builders in Cardiff services and our home extensions.
Moving home in Cardiff incurs stamp duty, estate agent fees, and legal costs running into tens of thousands. A bespoke loft conversion turns wasted attic space into a master bedroom, en-suite, or studio while significantly increasing your property's market value.
The most popular conversion across Cardiff terraces in Canton, Roath, and Cathays. Flat roof rear dormers maximize head height and floor area, easily accommodating a double bedroom and luxury en-suite.
Ideal for Cardiff 1930s semi-detached homes in Heath, Whitchurch, Rhiwbina, and Birchgrove. We extend the sloping hip wall into an upright gable, creating dramatic internal volume and stair access.
Where existing ridge height is generous (over 2.3m), premium Velux roof windows provide natural light with zero exterior structural alterations. The fastest and most cost-effective conversion option.
Cardiff's distinct residential neighbourhoods present unique architectural considerations:
Head Height Benchmark: You need a minimum of 2.2m of clear height measured from the top of the existing ceiling joists to the underside of the ridge board. Once insulated and boarded, this provides the statutory 2.0m building regulations clearance.
Cardiff homeowners are often misled by English planning articles claiming prior approval or different volume criteria. In Wales, planning permission for loft conversions falls under the Welsh Statutory Instrument:
Cardiff Council has designated several historic conservation areas — including Pontcanna, Llandaff, Cathedral Green, Roath Mill Gardens, and parts of Penylan. Within conservation areas:
Permitted development rights for roof alterations and dormers are withdrawn. A full planning application must be submitted to Cardiff Council (County Hall, Atlantic Wharf). We design conservation-compliant dormers with matching natural slate, traditional lead cheeks, and heritage timber or conservation-grade rooflights that receive planning approval without unnecessary delays.
We also work closely across neighbouring towns — explore our dedicated loft conversions in Penarth and loft conversions in Barry.
Get an instant indicative price for your conversion based on property type, dormer style, and en-suite requirements.
Try the Loft Cost EstimatorIn most residential Cardiff properties outside conservation areas, no planning permission is required if work conforms to Welsh Permitted Development rules (under 40m³ for terraces, under 50m³ for detached/semis, 20cm eaves setback, and matching materials). If you are inside a Cardiff conservation area like Pontcanna or Llandaff, full planning permission is required from Cardiff Council.
Yes. Cardiff terraces convert remarkably well due to their traditional steep roof pitches. A rear dormer or outrigger dormer provides substantial floor space for a master bedroom suite, wardrobe space, and an en-suite bathroom.
When installing structural steel beams into or bearing onto a shared party wall, you must serve a Party Wall Notice on adjoining owners at least two months prior to commencing structural works. We provide structural drawings and calculation packages to ensure straightforward neighbor consent.
A straightforward Velux conversion in Cardiff typically starts around £25,000–£32,000. A standard rear dormer conversion with an en-suite bathroom typically ranges between £38,000 and £52,000, while larger hip-to-gable or L-shaped mansard conversions range between £50,000 and £75,000+ depending on structural steel, architectural glazing, and bespoke finishings.
Tell us your Cardiff address and property type. We will arrange a free on-site roof survey to inspect head height, structural load points, and roof timbers before providing a fixed, transparent quote.
11a Royal Buildings, Stanwell Road
Penarth & Cardiff, CF64 3ED
info@allaspectsconstruction.co.uk
029 2003 6677
Nick (Direct): 07519 377053
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