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Extensions and structural alterations

You will need Building Regulations approval for all structural alterations and most extensions to your property. This is because these projects may require additional load-bearing support (for example, by inserting a beam), insulation, ventilation or alterations to the roof. Typical projects include:

  • knocking down load-bearing walls and inserting new beams
  • extending your property
  • adding one or more new rooms
  • converting an existing carport into a garage

Extensions which are exempt

Some small extensions are exempt from Building Regulations. These must be at ground level, with a floor area not more than 30m², and one of the following:

  • a covered yard or covered way
  • a carport open on at least two sides
  • a conservatory or porch*

*Conservatories or porches are exempt only if their glazing complies with Part K of the Building Regulations, and they are separated from the main living area of the house by external quality doors. See our Frequently asked questions page for more details.

Our online service is the quickest and easiest way to submit a Building Notice application for Buildings Regulations approval.

Apply online

If you would prefer to apply another way, please return to the Do I need Building Regulations approval? page for further advice. 

Planning permission

You should also check if your extension project needs planning permission before starting work.