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Building Regulations

lean to conservatoryBuilding Regulations are a defined set of standards to ensure that new properties and some extensions are constructed to be energy efficient, structually safe, protected from fire and have sufficient ventilation for the purpose of the structure. Local authority building control officers issue Building Regulation approval and major works may involve inspection at various stages of construction to ensure that these building standards are met.


Conservatories are normally exempt from building regulations...

At the current time conservatories are normally exempt from building regulations in England and Wales if:

  • They are situated at ground level, single storey and are permanently separated from the remainder of the property by a door.
  • The walls are glazed by a minimum of half their size.
  • The roof must be completely translucent or transparent with at least 75% of the area formed by glazing using polycarbonate sheets or similar translucent material.
  • Glazing must be toughened safety glass.
  • Any radiator in the conservatory has to be controllable and must have their own separate on/off controls.
  • The conservatory must not contain any drainage facilities for a washing machine, dishwasher etc.
  • The total floor area does not exceed 30m2.


2010 Amendment To Document L

Building regulations in England and Wales were revised in October 2010 and although more stringent controls have been introduced for the main home, surprisingly conservatories continue to remain exempt subject to certain criteria.  You can check the exact requirements for England, Wales and Scotland by visiting:

DirectGov web site for more information on planning and building regulations in England and Wales.


We recommend that you consult your local building control department and discuss your project with them to ensure that the addition is not subject to building regulations.

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