Do I need building regulations consent?

Most building work will require building regulations permission. This is a different requirement to planning permission, and must be applied for separately.

Special rules also apply to listed buildings and buildings in conservation areas.

The following types of project are 'regulated':

  • structural alterations to a building
  • most extensions to a building including conversion of a loft and garage conversions, but excluding porches and conservatories (see exemptions)
  • structural alterations, such as removing a load-bearing wall
  • when installing replacement windows using a builder or window company that is not registered with the relevant competent persons schemes
  • installation of heating, hot water and air conditioning systems.
  • installing additional bathroom fittings
  • domestic electrical installations
  • alterations to drainage systems
  • re-roofing (if it is greater than 25% of the roof)
  • replacing windows, doors or roof lights
  • underpinning a building
  • renovating a thermal element, for example walls, floors and roofs
  • changing the energy status of a building
  • changing the use of a building, for example barn conversions


Building regulations do exempt some buildings from the need to make an application. These include:

  • detached buildings housing machinery which people do not visit except for maintenance or repair
  • certain greenhouses and agricultural buildings
  • small detached buildings under 30 square metres where no sleeping accommodation is provided
  • extensions of a building by the addition at ground level of conservatories, canopies, porches, covered ways and car ports, all with a floor area not exceeding 30 square metres
  • temporary buildings that are not intended to remain in place for more than 28 days.

Please visit the planning portal website for guides and examples of where building regulations may be required.

Visit Planning Portal for guides and examples of where building regulations may be required.

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