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Whether you are simply looking to add a modest porch to your property, a two storey extension or merely require assistance with planning or building regulations consent, our design team will help to turn your ideas into workable detailed drawings.

Whether you are considering a traditional brick/block work construction, timber framed or implementing a more modern type of construction (SIPS, etc) our experienced design team will be able to assist.


Extending or adapting your property is considered to be permitted development, not requiring householder planning consent, subject to the following limits and conditions.

Will I need planning permission for my house extension?

  • No 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.
  • Single-storey rear extension must not extend beyond the rear wall of the 'original house' by more than three metres if an attached house or by four metres if a detached house (currently under government review).
  • Maximum height of a single-storey rear extension of four metres.
  • Maximum depth of a rear extension of more than one storey of three metres beyond the rear wall of the 'original house' including ground floor.
  • Maximum eaves height of an extension within two metres of the boundary of three metres.
  • Maximum eaves and ridge height of extension no higher than existing house.
  • Side extensions to be single storey with maximum height of four metres and width no more than half that of the original house.
  • Roof pitch of extensions higher than one storey to match existing house.
  • Materials to be similar in appearance to the existing house.
  • No verandas, balconies or raised platforms.
  • Upper-floor, side-facing windows to be obscure-glazed; any opening to be 1.7m above finished floor level.
  • On designated land (i.e. Conservation, AONB, etc), no permitted development for rear extensions of more than one storey.
  • On designated land, no cladding of the exterior.
  • On designated land, no side extensions.

Will I need building control approval for my house extension?

Yes you will also require building control approval for your house extension. This can be done either with a full plans application or via a building notice (not always applicable). Either way a set of fully compliant, building regulations plans and specification will be invaluable to you, both in terms of getting your project passed by building control and obtaining accurate quotations from building contractors.

What is included in your architectural house extension plans?

Our house extension plan package includes all required floorplans, elevations, section details, full building regulations specification, structural drawings and calculations (produced by our fully qualified and chartered structural engineer). This enables all of our customers to obtain accurate and competitive quotations from their selected building contractors. In addition, we can assist in nominating a suitable contractor for the works if required.