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Planning and Building Regulations

Most conservatories do not require planning permission as they are usually regarded as permitted development. The current allowances before planning permission is required are set out below. Please note that in some circumstances permitted development rights have been removed and therefore planning permission will still be required for a conservatory of any size.

We will submit Planning Applications on your behalf to facilitate your project.

We can advise you on all aspects of planning requirements and will submit an application on your behalf FREE OF CHARGE. 

The following is only a general guide, if you are in any doubt then please talk to us or the Planning department of your District Council.

For terraced house

  • Up to 50 cubic metres or 10% of the volume (whichever is the greater) is allowable.

For semi-detached or detached house

  • Up to 70 cubic metres or 15% of the volume (whichever is the greater) is allowable.

In all cases

  • These allowances are subject to an overall limit of 115 cubic metres.

The above allowances only apply provided that:

  • There have been no previous extensions since 1947, if there have been these can count against the above allowances.

  • No part of the proposed conservatory extends above the highest part of the original dwelling or forward of any wall of the building facing a highway which is less than 20 metres away.

Building Regulations

Building regulations are not usually required, however there are some circumstances when they are needed which are listed below.

  • If floor area of the conservatory exceeds 30 square metres

  • If more that 50% of external wall area is of a non translucent material

  • If the conservatory is not separated from the habitable part of the dwelling by doors/walls of equivalent construction as the external fabric of the dwelling.