Planning & Building

Under new regulations that came into effect from 1 October 2008 adding a conservatory to your home is considered to be permitted development, not needing 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.
• Maximum depth of a single-storey rear extension of three metres for an attached house and four metres for a detached house.
• 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 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.
• No verandas, balconies or raised platforms.
• On designated land** no permitted development for rear extensions of more than one storey; no cladding of the exterior; no side extensions.
• Where work is proposed to a listed building, listed building consent may be required.

*The term “original house” means the house as it was first built or as it stood on 1 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.

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

You may also need to check if your house is a ‘new build’ as developers sometimes place restrictions on them. Although this may appear a little confusing, Conserv-a-tech conservatory designers are very knowledgeable on planning permission and will be able to answer any questions you may have and talk you through all the legalities above.

If you wish, we can deal with any necessary planning applications on your behalf or provide you with written confirmation if your home is exempt from planning permission.

Will my conservatory need to satisfy building refulations?

Building regulations will generally apply if you want to build an extension to your home. However, conservatories are normally exempt when they meet a number of conditions:

• They are built at ground level and are less than 30 square metres in floor area
• At least half of the new wall and three quarters of the roof is either glazed or translucent material
• The conservatory is separated from the house by external quality door(s).
• Glazing and any fixed electrical installations comply with the applicable building regulations requirements
• Any new structural opening between the conservatory and the existing house will require building regulations approval, even if the conservatory itself is an exempt structure.