The IOA has responded to the Microgeneration Certification Council (MCS) consultation on the MCS 020 Planning Standard for Permitted Development Installations of Air Source Heat Pumps (ASHP). Many members of the IOA regularly carry out noise impact assessments of heat pump installations.  While installation of ASHP is permitted development, it must comply with MCS 020. Two consultation workshops were held to gather our members’ experience and inform our response to the consultation with, 120 professionals attending.