PAS to Passivhaus: Comparing Retrofit Standards Table

Introduction

As the UK moves toward its 2050 net zero target, retrofitting existing homes is a national priority. However, energy-efficient building – especially retrofit – carries risks. Poorly executed upgrades can lead to mould, condensation, and structural damage, affecting occupant health, comfort, and long-term durability. To address these risks, provides a structured, risk-managed approach. It includes ventilation checks, moisture control, and post-installation evaluation, supported by whole-dwelling assessments that consider building condition, occupant behaviour, and measure interaction.