What has to be certified?
Where a window or windows is/are completely replaced (as opposed to repaired) in
existing dwellings, they must comply with Approved Documents Parts L1B and K4 (England)
or N (Wales) (safety in relation to impact). In addition, the building should not
end up with a worse level of compliance with respect to other applicable parts of
the Building Regulations, which includes Parts A (Structure), B (means of escape
in case of fire), C (Moisture Penetration, F (ventilation), J (combustion appliances
and fuel storage systems), M (access for the disabled) and Regulation 7 (Workmanship
The Building Regulations for replacement windows state that "The situation must
be made no worse than the outgoing windows". For example if the outgoing windows
contained trickle vents the new placement windows must include them.
Windows and doors in critical locations ie windows below 800mm from floor level
and doors where the glass comes within 1500mm of the floor level to the start of
the glass must contain safety glass (toughened or laminated) and must include the
relevant safety mark clearly visible to comply with Approved Document N.
Compliance with the Gas Safety (Installation and Use) Regulations 1998 is also essential.
FENSA does not apply to conservatories, porches, commercial premises or new build
properties or extensions. In all of these instances you are required to go through
the Local Authority Building Control process. If your property is a flat then planning
permission may be required before replacing your windows, therefore it is advisable
to check this with the Planning Department of your Local Authority. If planning
permission is required a FENSA registered company can register the installation
for certification purposes. If you live in a property that is a Listed Building
and wish to replace your windows this would fall under the jurisdiction of the relevant
Local Authority therefore planning permission would be required and the installation
cannot be registered with FENSA.
Doors with less than 50% glazing do not require registration.
FENSA also does not apply to caravans or holiday chalets.