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Application of Part L to Conservatories attached to existing dwellings 

The introduction of the new Part L has caused Building Control Bodies and industry difficulties in deciding what constitutes a conservatory in order to be exempt from making a Building Regulations application. The definition of a conservatory previously contained in AD L1B of the April 2006 edition is no longer included in the 2010 Approved Document.

his best practice note is intended to provide guidance that will promote a consistent approach to defining what a conservatory is, for the purposes of being considered exempt from the need to make a Building Regulations application.

useful document 

Page last updated on 11/9/2013