Permitted development rights
Permitted development rights are a national grant of planning permission which allow certain building works and changes of use to be carried out without having to make a planning application.
Some changes from one use class to another are covered by permitted development rights. Some building works associated with these changes of use can also be covered by permitted developments rights. However, to be eligible for any of these rights, the proposal must meet the specific limitations and conditions set out by the national legislation. It is advisable to submit a Lawfulness certificate application to the planning department to find out whether your proposal is within your Permitted Development Rights or not..
Any unauthorised development can also be regularised through a Lawfulness Certificate (Existing Use) application after 4 years of continuous use of residential properties or 10 years of continuous use for commercial properties.
The 6m / 8m rear extensions from the original rear part of the building also come under Permitted Development rights but require a Prior Notification application, which must be submitted to the Planning Department to obtain Prior Approval.