Is Planning Permission Required For My Optimum Garden Building?

You’ll be pleased to learn that outbuildings are generally considered to be permitted development and therefore do not need planning permission, subject to the following limits and conditions:

  • No outbuilding is proposed on land forward of a wall forming the principal elevation of the house.
  • Outbuildings are to be single storey with maximum eaves height of 2.5 metres and maximum overall height of four metres with a dual pitched roof or three metres for any other roof.
  • The building should not exceed a maximum height of 2.5 metres if within two metres of a boundary of the curtilage of the dwelling house.
  • No raised balconies or platforms.
  • No more than half the area of land around the “original house” would be covered by additions or other buildings.
  • In National Parks, the Broads, Areas of Outstanding Natural Beauty and World Heritage Sites the maximum area to be covered by buildings more than 20 metres from the house will be limited to 10 square metres.
  • On designated land* buildings at the side of properties will require planning permission.
  • Within the curtilage of listed buildings any outbuilding will require planning permission.

*Designated land includes national parks and the Broads, Areas of Outstanding Natural Beauty, conservation areas and World Heritage Sites.

Permitted Development for householders – Technical Guidance

You are strongly advised to read a technical guidance document produced by the Government. This will help understand how permitted development rules might apply to your circumstances.

View ‘Permitted development for householders – Technical guidance’ on

It is the responsibility of the customer to ensure that correct permissions are obtained for their building. Optimum Garden Buildings do not need evidence of the permissions to complete the work.