Class R Permitted Development

Class R developments are only permissible if the details are submitted to the local authority for prior approval before any works begin. It’s worth taking this type of consideration into account during the project design stage to ensure that any conversions or changes accommodate for potential future usage from the beginning.

The application procedure for Class R varies somewhat depending on the size of the building:

Buildings with less than 150 m² of existing floor space:

For buildings (and areas within the curtilage) where the cumulative floor space (to be converted) does not exceed 150 m² the local authority following need to be advised (in writing) as follows:

• The date the site will begin to be used for any flexible use
• The proposed nature of the use or uses
• A plan indicating the site and which buildings have changed use

For cumulative development of floor areas up to 150 m², on buildings that fit the criteria, there is no requirement to wait (from the date of submission) before development or use can start.

Buildings exceeding 150 m²:

Where the cumulative, existing floor area to be changed exceeds 150 m² (but not exceeding 500 m²), a 56 day notice to the Planning Authority for prior approval must be submitted. There are four reasons only, why prior approval may not be given.

• Transport and highways impacts of the development.
• Noise impacts of the development.
• Contamination risks on the site
• Flood risks

For buildings exceeding 150 m², development under Class R cannot begin before written confirmation is received that either prior approval is – or is not required.

However, change of use or developments can proceed immediately if the local planning authority exceed the 56 days required make their decision.