There are currently around 740 buildings and structures which have been listed as being of architectural and historic interest in the Vale of Glamorgan.
The responsibility for listing buildings lies with Cadw.
Alterations to Listed Buildings
Any works which will affect the character of a listed building, be they internal, external, structural or decorative, including any works to an object or structure fixed to the building or within the curtilage of the building (in its grounds, garden, enclosure etc.) will require Listed Building Consent. This is quite separate to any requirement for Planning Permission or to obtain Building Regulations approval.
Unauthorised works to a listed building are viewed with great seriousness in law, and may result in prosecution proceedings. Fines of up to £20,000 and / or up to 12 months imprisonment may be awarded upon summary conviction.
You can apply for Listed Building Consent via the Make a Planning Application page.