Converting an existing cellar beneath a dwelling from a storage area to habitable space usually only involves building control approval. If you plan to have new window/door openings or external access or if you wish to create a fully self-contained unit then planning consent maybe required.
At your initial consultation our surveyor will discuss the issues surrounding the project and any requirements under building control and or planning approvals that maybe required.
For more information visit www.planningportal.gov.uk.
Planning policy on basement conversions varies but it is very difficult for a local authority to find reasonable grounds for refusal, especially if the work does not significantly alter the building’s appearance.