Following an application for a Cavity Wall Insulation grant, an Installer registered with CIGA, the Cavity Insulation Guarantee Agency will carry out a free, no-obligation survey. The surveyor will check for any problems that would mean the insulation could not be fitted, including: brickwork in poor condition, signs of damp and rubble present in the cavity...

Firstly, you need to be sure that you actually have cavity walls before checking whether they have been insulated.

If your property is built from stone or concrete, then it will not have cavity walls. If it is timber-framed or steel-framed, a cavity may be present but the walls will not be suitable for insulation under the ECO grant scheme...