Do You Need Planning Permission for a Loft Conversion?

Do You Need Planning Permission for a Loft Conversion

It is essential to know whether you need Planning Permission for loft conversion or not before starting the project. The Planning Permission requirement is based on the type and extent of your loft conversion project. Some types of loft conversion are categorised as permitted developments for which Planning Permission is not needed, whereas others require Planning Permission.

This guide includes the conditions under which loft conversion is regarded as a permitted development. It also covers information about Planning Permission requirements for different types of loft conversions, their cost, approval time, and validity.

Loft Conversion – A Permitted Development

Based on the conditions and limits given in Schedule 2, Part 1, Class B of The Town and Country Planning (England) Order 2015, the following conditions do not demand Planning Permission because of categorisation as permitted development:

  • The converted loft is at most 40m3 for terraced houses.
  • The converted loft does not exceed 50m3 for detached and semi-detached homes.
  • The converted loft does not exceed the existing roof slope’s plane at the principal elevation, i.e., the house’s front side.
  • The converted loft only rises up to the existing roof structure’s highest point.
  • There is no balcony, veranda, or any other raised platform included in the loft conversion project.
  • The material being used in the loft conversion project is similar in appearance to the rest of the property.
  • The side-facing windows are obscurely glazed.
  • Opening side-facing windows must be at least 1.7m above the floor of the room.
  • The location of your property is not in a designated area, such as any national park, conservation area, World Heritage Site, or AONB (Areas of Outstanding Natural Beauty).

Planning Permission Requirement

The permitted development rights are only applicable to homes, and Planning Permission will be required for a:

  • Home located in area where Permitted Developments Rights do not apply
  • House created through the Permitted Development Right to change use
  • Non-dwelling building
  • Converted house
  • Maisonette
  • Flat
Permission for a Loft Conversion

Loft Conversion Types & Planning Permission

Planning Permission requirements vary based on the type of loft conversion as follows:

Dormer Loft Conversion

This type of loft conversion does not need Planning Permission as it is created by vertically extending your existing roof’s slope. It does not involve significant exterior changes to your home; therefore, it is categorised as a permitted development.

Hip-to-Gable Loft Conversion

Hip-to-gable loft conversion falls under permitted development as it involves the formation of a vertical wall by straightening your roof’s sloping side. It does not require Planning Permission approval as it does not involve significant exterior changes to the roof structure.

Mansard Loft Conversion

Mansard loft conversion project requires obtaining Planning Permission approval as it involves raising the pitch of your roof’s one side to make it vertical with a flat top. This type of loft conversion is not a permitted development as it involves significant structural changes to your roof.

Cost of Planning Permission

The application fee for Planning Permission varies from £202 to £206 in England, Scotland, and Northern Ireland to alternate and extend a single dwelling property. However, the application fee can cost up to £230 in some cases. On the other hand, there is no fee for applications for listed buildings or demolishing in conservation areas.

Planning Permission Approval Time

Based on the type and extent of your loft conversion project, the time required for Planning Permission approval by the local planning authorities varies as follows:

  • Planning Application for Straightforward Projects – 8 Weeks
  • Planning Application for Large Scale Projects – 13 Weeks
  • Planning Application Requiring EIA (Environmental Impact Assessment) – 16 Weeks

Planning Permission Validity

The validity of a Planning Permission notice is almost 3 years, starting from the date they were granted. You need to start your project at any time during these 3 years but it can be completed at any later time.

Final Words

Planning Permission approval is not required for loft conversion projects falling under the category of permitted development. But if you exceed the limitations and restrictions specified according to permitted development rights, then you must have to obtain this approval to carry out your project.

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