This form must be completed for all loft insulation measures with less than or equal to (≤) 100mm of pre-existing loft insulation.
The form must be secured in the loft for the purposes of technical monitoring. If, during a technical monitoring inspection, the completed declaration is not present in the loft, that measure will fail technical monitoring. Only the form provided on our website can be used to meet this requirement.
This document helps to provide us with some assurance that no loft insulation has been removed in the past six months and that the correct starting depth has been identified.
Further information on the ECO3 requirements can be found in our ECO3 Guidance.