The installation of cavity wall insulation is specifically defined as
notifiable building work in the Building Regulations. This means that for all
buildings which are not exempted from the Regulations it will be necessary to
submit a building notice to a building control body stating that cavity wall
insulation work will be carried out. Most local authorities do not levy a
building control charge in respect of such building notices. If the installer
is registered with The Cavity
Insulation Guarantee Agency
the installer will in most cases submit the
building notice. In any case building owners should always check that a building
notice will be submitted.
The Building Regulations require that the insulation material used is
suitable for the wall construction concerned. In the case of some foam cavity
wall insulating materials an assessment of the risk of the emission of
formaldehyde gas will need to be carried out.
Local authority building control departments can give more detailed guidance.