Prior to considering submitting building plans to your local authority to obtain planning permission. First check if you actually need to do so.
These days there is a great deal that can be actioned under the heading (PDR) permitted development rights, including new build conservatories and extensions, providing of course those certain conditions are met.
Permitted development rights allow homeowners to improve and extend their homes without the need to apply for formal planning permission, where that would be out of proportion with the impact of works carried out. (Source permitted development rights for householders technical guidance)
In general terms single story extensions that do not extend beyond the rear of your property by 3m for a terrace home or 4m for a detached home for example could fall within PDR (permitted development rights).
Single story extensions and new build conservatories that meet PDR can be built to an overall height of 4m from floor to the top of the ridge.
It is worth pointing out at this stage that homes sitting within areas of natural beauty and conservation areas, also listed buildings are unlikely to hold permitted development rights, and almost certainly will require planning approval for works carried out.
This guidance below reflects temporary increases to the size limits for single-storey rear extensions that must be completed by 30 May 2019, and the associated neighbour consultation scheme.
An extension or addition to your house is generally considered to be permitted development, not requiring an application for planning permission, subject to the following limits and conditions:
- 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.
- 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.
- Side extensions to be single storey with maximum height of four metres and width no more than half that of the original house.
- Two-storey extensions no closer than seven metres to rear boundary.
- Roof pitch of extensions higher than one storey to match existing house.
- Materials to be similar in appearance to the existing house.
- Generally PDR does not extend to verandas, balconies or raised platforms. These are normally a no and not covered under PDR
- Upper-floor, side-facing windows to be obscure-glazed; any opening to be 1.7m above the floor.
Always check with your local authority to obtain further information, alternatively.
For further advice and information visit:
Please note that building works carried out in Scotland fall under different planning rules and regulations.