FENSA Limited is the Fenestration Self-Assessment Scheme forcompanies
that install windows and doors in dwellings.
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FENSA Guidance notes:
In order to assist its member’s interpret various aspects of
the approved documents, FENSA has issued a series of guidance notes.
Special Note: These are
the interpretations being used by "FENSA
This is important because some of the
local authorities may interpret some of the building regulations
differently. If you are not using a FENSA member and are going to
apply to the local
authority for permission rather than use a FENSA company you would
be well advised to seek clarification before an installation commences.
FENSA Guidance Notes (1)
Conservatories - Definition
It is essential when considering whether a structure is a conservatory
and therefore not part of the main structure of the property to understand
the definition as quoted in the Building Regulations.
The structure needs to have:
- Not less than ¾ of the
roof area made from translucent material, and
- Not less than ½ of the wall
area made from translucent material
- Either unheated, or heated by a system
with own and separate heating controls (ref. Approved Document L1
CL 1.59(b)), and
Be separated from the main residence by "external" doors
If the structure meets this definition, in full, then it is exempt from
the requirement of Approved Document L1.
Furthermore if the structure is less than 30m2 then it is generally
not necessary to obtain building control approval (Ref: Schedule 2, Class
It should be noted that whether or not a structure is deemed to be a
'conservatory', or an extension to a dwelling, the requirements of Approved
Document N apply.
If the structure is deemed to be a conservatory then all doors and windows
between the conservatory and the main residence must, when replaced,
comply with Approved Document L1, and to the documents to which it refers.
The conservatory is not to be registered with FENSA but replacing the
dividing doors and windows needs to be.
If the structure does not meet the full definition of a conservatory
it does not have an exempt status and must comply with Approved Document
L1. In this situation any doors and windows between the residence and
the extension will be classed as internal and exempt from Approved Document