I’d like to add an extension to my ground-floor flat. What are the legalities to consider?

If you plan to add an extension to your ground-floor flat, the first task is to check your lease to see if an extension is allowable.

If your lease permits the extension, you will probably be required to give notice to the other flat-owners and to the leaseholder. If the freehold is owned by the leaseholders through a management company vehicle, there will generally be no issue to propose what you are planning. If the freehold is owned by a non-resident person or organisation, you may be charged a fee for their approval.

There are no Permitted Development rights attached to flats; you will need to submit a planning application. Check if there are public sewers near your proposed building zone. You will also need to obtain Building Control approval.