On designated land*, cladding of any part of the exterior of a dwelling (including extensions/conservatories) with stone, artificial stone, pebble dash, render, timber, plastic or tiles is not permitted development.

The regime for larger single-storey rear extensions (see point 5) does NOT apply on designated land and sites of special scientific interest.

On designated land conservatories extending beyond any side wall of the original house* are NOT permitted development.

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Definitions of terms used

• Original house - 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 - Designated land (Article 2(3)) includes national parks and the Broads, Areas of Outstanding Natural Beauty, conservation areas and World Heritage Sites.
• Principle elevation - The most visible or prominent side of a structure, typically facing a street or public area. While often considered the 'front' of the building, it may not always contain the main entrance.

Conservatories (including previous extensions) and other buildings must not exceed 50% of the total area of land around the original house*.

Sheds and other outbuildings must be included when calculating the 50% limit.

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Definitions of terms used

• Original house - 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 - Designated land (Article 2(3)) includes national parks and the Broads, Areas of Outstanding Natural Beauty, conservation areas and World Heritage Sites.
• Principle elevation - The most visible or prominent side of a structure, typically facing a street or public area. While often considered the 'front' of the building, it may not always contain the main entrance.

Conservatories cannot be built forward of the 'principal elevation'* or, where it fronts a highway, the 'side elevation.

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Definitions of terms used

• Principle elevation - The most visible or prominent side of a structure, typically facing a street or public area. While often considered the 'front' of the building, it may not always contain the main entrance.

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Side conservatories must be single storey and not have a width greater than half the width of the original house*, with a maximum height of four metres.

On designated land* conservatories extending beyond any side wall of the original house are NOT permitted development.

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Definitions of terms used

• Original house - 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 - Designated land (Article 2(3)) includes national parks and the Broads, Areas of Outstanding Natural Beauty, conservation areas and World Heritage Sites.
• Principle elevation - The most visible or prominent side of a structure, typically facing a street or public area. While often considered the 'front' of the building, it may not always contain the main entrance.

Single-storey rear conservatories must not extend beyond the rear wall of the original house* by more than four metres if a detached house; or more than three metres for any other house.

Where not in designated land* or a Site of Special Scientific Interest, this limit can be increased to eight metres if a detached house; or six metres for any other house but will require an application for prior approval.

Single-storey rear conservatory must not exceed a height of four metres.

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Definitions of terms used

• Original house - 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 - Designated land (Article 2(3)) includes national parks and the Broads, Areas of Outstanding Natural Beauty, conservation areas and World Heritage Sites.
• Principle elevation - The most visible or prominent side of a structure, typically facing a street or public area. While often considered the 'front' of the building, it may not always contain the main entrance.

The highest part of the conservatory should be no higher than the roof ridge line of the existing house.

Maximum eaves height should be no higher than the eaves of the existing house.

If a conservatory (at the side or rear) is within two metres of a boundary, eaves should be no higher than three metres to be permitted development.

Conservatories are normally exempt from building regulations provided they meet a number of conditions. Read further guidance on Planning Portal.