Your Extension May Come Under Permitted Development

 Permitted Development

Permitted Development

Sms Timber Frame give you a basic summary of how and when your project is eligible for permitted development ( All content taken from the planning portal ).

 PLEASE READ: All customers please note that although your project may have every chance of being Permitted Development, we recommend that any construction works that take place are discussed with your council prior to any works taking place, as it is better to find out in advance if their are any issues that you may not have been aware of.

Single Storey Extension

An extension or addition to your home is considered to be Permitted Development ( not requiring an application for planning permission) provided certain limits and conditions are met.
  1. On designated land cladding of any part of the exterior of a dwelling (and extensions) with stone, artificial stone, pebble dash, render, timber, plastic or tiles is NOT permitted development. PLEASE NOTE THIS IS ONLY ON DESIGNATED LAND.

    (Designated land includes national parks and the broads, areas of outstanding natural beauty, conservation areas and world heritage sites)

  2. Extensions, including previous extensions, and other buildings must not exceed 50% of the total area of land around the original house. The term "original house" means the house as it stood on the 1st of July 1948 (if it was build before that date). Although you may not have built an extension to the house, a previous owner may have done so.

  3. Extensions forward of the principal elevation elevation or side elevation and fronting a highway are NOT permitted development.

  4. On designated land, side extensions are not permitted development.

  5. Materials used in exterior work to be similar in appearance to those of the exterior of the existing house.

  6. Width of side extension must not have a width greater than half the width of the original house.
  7. Side Extensions to be single storey with a maximum height of four metres.
  8. If extension is within two metres of a boundary maximum eaves height should be no higher than three metres to be permitted development.
  9. Single-Storey rear extension must not exceed a height of four metres.
  10. Maximum eaves and ridge height of extension no higher than existing house.
  11. Single Storey rear extension must not extend beyond the rear of the original house by more than 3 metres if an attached house and four metres if a detached house.

    POINT 11-  Although point number 11 is correct at current, an announcement has been made suggesting that in the near future changes may allow you to extend your home 6 metres if an attached home and 8 metres if a detached home. We will keep you up to date with this news.

    All information sourced from the Planning Portal, to see an interactive guide to this, to better help you understand please click here.
    (This link will re-direct you to the planning portal website).

Two Storey Extension

 Extensions of more than one storey.

  1. On designated land, extension of more than one storey are not permitted development.

    (Designated land includes national parks and the broads, areas of outstanding natural beauty, conservation areas and world heritage sites)

  2. Extensions, including previous extensions, and other buildings must not exceed 50% of the total area of land around the original house. The term "original house" means that the house as it was first built or as it stood on 1st of July 1948 (if it was built before that date). Although you may not have built an extension to the house, a previous owner may have done so.

  3. Maximum eaves and ridge height of extension no higher than existing house. If extension is within two metres of a boundary maximum eaves height should be no higher than three metres to be permitted development.

  4. Extensions of more than one storey must not extend beyond the rear wall of original house by more than three metres or be within seven metres of any boundary opposite the rear wall of the house.

  5. Roof pitch of extension higher than one storey to match that of existing house to match that of the existing house, as far as practicable.

  6. Materials used in exterior work to be similar in appearance to those of the exterior of the existing house.

  7. Any upper-floor window in a wall or roof slope in a side elevation must be obscure-glazed and non-opening unless the parts which can be opened are more than 1.7 metres above the floor of the room in which it is installed.

  8. No verandas or Balconies are permitted development.










    All information sourced from the Planning Portal, to see an interactive guide to this, to better help you understand please click here.
    (This link will re-direct you to the planning portal website).
permitted development_TechnicalGuidance.pdf permitted development_TechnicalGuidance.pdf
Size : 263.255 Kb
Type : pdf
Download the file to see a more detailed guide of permitted development.

Share Us With Your Friends!

 Sms Timber Frame Ltd | Unit 3 | Near Bank | Shelley | Huddersfield | West Yorkshire | HD8 8LS | 01484 609 900