PAS 2035 for homeowners: why it matters which standard your installer works to

PAS 2035 is the whole-house retrofit standard that came into force in 2019 and has been required for most government-funded retrofit work since 2021. It changed the industry by requiring that retrofit be approached systematically, not as a series of individual product installations.

Under PAS 2035, every significant retrofit project must be led by a qualified Retrofit Coordinator, informed by a Retrofit Assessment, and delivered in a sequence that considers how measures interact. The standard exists because poorly planned retrofit can cause real problems, such as damp, condensation, and structural issues, when measures are installed without understanding the building as a whole.

For homeowners commissioning any significant energy upgrade, the question to ask is simple: does your installer work to PAS 2035? If the answer is no, or if they're not sure what it is, that's useful information.