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Loft conversions

You will need to make a Building Regulations application if your loft conversion involves:

  • new accommodation in the roof space - bedroom, spare bedroom, study, occasional playroom, etc
  • structural alterations - adding or removing joists, installing a roof light, trimming the rafters, etc

If the conversion involves any alteration to the size or external appearance of the building, then planning permission may also be required.

Please check with the Building Control Section before undertaking any such work.

What things do I need to consider?

The following guidance only applies to loft conversions:

  • with one or two rooms only
  • with a floor area of no more than 50m²
  • in an existing one or two storey single-family dwelling

For advice on any other type of building, please contact the Building Control Section.

The information in the following pages is for guidance only. Loft conversions often involve complex construction issues, and you are advised to use the services of a qualified architect or surveyor if you are thinking of undertaking such work on your property.

If you have any queries after reading these pages, please contact the Building Control Section, who will be pleased to help you.