Single Storey Extension Drawings


At Your Plans, we can design your single storey extension to give your family that extra needed living space.


Single storey extensions are a great way of increasing your dining room and kitchen, as well as creating additional lounge space.


Single storey extensions can be produced under permitted development, however their are certain limitations to the design of the single storey extension. These include height and overall size. We can offer you guidance on permitted development and provide you with permitted development drawings.


Our single storey extension drawings provide you with all you need to gain approval under permitted development, or planning permission and we can provide detailed 3D drawings and walkthroughs to help you choose your final design before submission. 3D drawings and designs provide a more realistic idea of how the finished product will look. 


If you would like to obtain a free quotation, please use our online quote generator to calculate your quote, or give us a call on 01920450457 and we can assist you.

Permitted Development For Single Storey Extensions


If your single storey extensions plans are considered to be permitted development, the following limits and conditions must be met:

  • 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.

  • In addition, outside Article 2(3) designated land* and Sites of Special Scientific Interest the limit is increased to 6m if an attached house and 8m if a detached house until 30 May 2019.

  • These increased limits (between 3m and 6m and between 4m and 8m respectively) are subject to the prior notification of the proposal to the Local Planning Authority and the implementation of a neighbour consultation scheme.

  • If objections are received, the proposal might not be allowed.

  • Maximum height of a Single Storey rear extension of four metres.

  • Extensions of more than one Storey must not extend beyond the rear wall of the original house* by more than three metres.

  • 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.

  • Single Storey Side extensions to have a with maximum height of four metres and width no more than half that of the original house.

  • Materials to be similar in appearance to the existing 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 the floor.

  • On designated land* 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.

Visit the uk planning portal for information, or give us a call to discuss your requirements.