Hannah Clarke, head of membership at the PCA, said: "Spray foam scammers are becoming increasingly sophisticated. The trade body said that around 250,000 homes in the UK are estimated to have spray foam insulation. Instead, it provides access to independently assessed surveyors who can evaluate the condition of spray foam insulation. "While there is guidance available for assessing spray foam insulation, there is currently no recognised trade body or independently audited sector representing companies that remove it. Homeowners who believe they may have been targeted by a spray foam scam can contact the PCA on 01480 400000.