Planning Permission & Building Regs in Cardiff
Ground floor rear extensions permitted up to 3m (semi/terraced) or 4m (detached) under GPDO Class A, with maximum eaves height of 3m when within 2m of a boundary.
Designated conservation areas across Cardiff require adherence to statutory Article 4 directions. Property owners must preserve original architectural profiles and consult the local planning register before altering highway-facing elevations.