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Planning Permission for a Conservatories?

Adding a conservatory to your home will be considered to be permitted development, not needing an application for planning permission, subject to the following limits and conditions:

  • More than half the area of land around the “original house”* would be covered by additions or other buildings.
  • No extension forward of the principal elevation or side elevation fronting a highway.
  • No extension to be higher than the highest part of the roof.
  • Maximum depth of a single-storey rear extension of three metres for an attached house and four metres for a detached house.

Planning Permission for a Porches?

When planning a porch, there a 3 factors to consider:

  • The ground floor area of the proposed porch
  • The proposed height of the porch
  • Distance from the boundary and highways

If your proposed porch development does not exceed 3 square metres (when measured externally), and would not be higher than 3 metres and would be located no closer than 2 metres from any boundary and highway, then planning permission would not be required; this can be carried out under your permitted development. If you live in a Listed Building, you will be required to apply for a Listed Building Consent.

Planning Permission for Garage Conversions?

Planning Permission may not be required subject to the following limits and conditions:

  • Planning permission is not usually required, providing the work is internal and does not involve enlarging the building.
  • If you live in a new house or a Conservation Area, it is likely that the Council may have removed your permitted development rights meaning that you may need planning permission to convert your garage.
  • Where work is proposed to a listed building, listed building consent may be required.

A garage conversion can normally be carried out under your permitted development rights.

Do I Need Building Regulations for my Garage Conversion?

Whilst you do not generally require planning approval to convert your garage into habitable space, you will normally require approval under the Building Regulations.

  • Walls: If for example you intend to infill the garage door with a new wall and a window for example, you will require approval. The reason for this is that the garage is likely to have been constructed off a shallow slab and therefore a new foundation required for the new wall.
  • Floors: Although the existing floor within the garage is likely to be strong enough for home use, it is likely that is will require upgrading to ensure it is adequate in terms of damp-proofing and thermal insulation. Also, you may wish to change the level of the floor to match that of the existing house. If this is the case, the easiest way to do this is to upgrade the existing concrete floor or if the levels permit, construct a timber floor over the existing.
  • Ventilation: The Building Regulations require that each new room (including garage conversions), should have adequate ventilation for general health reasons. Depending on the use of that room will determine the level of ventilation that will be required.

Ventilation can be provided in the following ways:

  • Purge: Quite simply, this can be achieved by opening the window. Typically, the opening should have an area of at least 1/20th of the room it is intended to serve. This will vary for a bathroom which can have a window of any open-able size.
  • Whole Building: Colloquially know as trickle ventilation, this is also required and is normally found in modern windows which incorporate a trickle system in the head of the window framework.

Whilst both these forms of ventilation are normally required, this does not preclude alternative approaches to ventilation. Such an alternative route should be discussed with the Building Control Body.


Assure Traleda Garcia