An implementation of a Condensation, Damp and Mould (CD&M) Strategy for the Thamesmead estate in south-east London Targeting 2000 homes. The evidence-based strategy is designed to manage CD&M systematically and focus on homes that will not be refurbished or replaced for some time. CD&M risk assessments and surveys are used to identify homes for a range of interventions, including energy advice, smart heating controllers and demand-controlled mechanical extract ventilation, in various combinations. Evaluation of the first phase of the programme indicates that it is effective in reducing CD&M and increasing the affordability of heating with the potential to improve health outcomes for residents. Analysis of IAQ has come through innovative use of data from smart thermostats and evaluation of vapour pressure.