Loft Conversion & Dormer Planning Permission in Cardiff

Some loft conversions in Cardiff fall under permitted development, but Wales' own planning rules, distinct from England's since the Planning (Wales) Act 2015, set different thresholds and processes - an England-focused guide won't reliably apply here. Always confirm directly with Cardiff Council's planning service before committing to a design.

Where it gets more complicated

The Victorian terraces across Cathays and Roath typically have steeper roof pitches than later housing, which can mean less dormer volume is needed to reach a comfortable head height. Because so much of the city is terraced, a party wall agreement with neighbours is usually needed before work starts - worth budgeting real time for, since it can add several weeks to the schedule.

Get it confirmed, don't assume it

A builder who works regularly in your specific part of Cardiff will usually already know whether your street sits inside a conservation area and roughly what the council will accept.