21/08/2026
Why might a homeowner, Landlord, Local Authority or Housing Association require a Cavity Wall Insulation Condition Inspection Survey ?
> An EPC can tell you
The recorded wall construction type (e.g. cavity, solid)
Whether cavity wall insulation appears to have been installed, based on visual evidence
The energy efficiency rating assigned to the walls
Potential improvement recommendations
The date and scope of the energy assessment
> An EPC may not establish
Whether the cavity has been physically inspected by a specialist
The current condition of the insulation
Whether insulation is evenly distributed throughout the cavity
Whether voids, settlement or gaps are present
Whether moisture has entered the cavity or affected the insulation
Whether external building defects are compromising the wall
Whether the insulation was installed correctly or to the appropriate standard
> A Cavity Wall Insulation Condition Inspection Survey can tell you
Whether cavity wall insulation is actually present
What type of insulation has been installed
Whether the cavity appears fully, partially or poorly filled
Whether insulation has slumped, settled or deteriorated
Whether there are voids, gaps or cold-bridge areas
Whether debris or obstructions are present within the cavity
Whether there is evidence of moisture ingress or damp-related problems
Whether the CWI appears appropriate for the property and its exposure
Whether defects could be contributing to damp, mould or heat loss
Whether defects could be contributing to increased energy costs
Whether further investigation, remediation or extraction may be considered
You can't properly assess CWI just by looking at the outside of a house.
A CIS looks at what is actually happening inside the cavity.
Your EPC may include useful information about your property's recorded wall construction and insulation — but an EPC is an energy assessment, not a specialist cavity wall condition inspection. This page explains what your EPC can and cannot tell you about your cavity wall insulation.
