This Practice Note provides guidance on the grant regime in the form of social housing assistance made available through the government sponsored Affordable Homes Programme operated by Homes England and the Greater London Authority. It covers: the meaning of grant funding/public subsidy for affordable housing; what it can consist of; sources of grant funding; who can apply; development eligible for affordable housing grant funding; the application process to obtain grant funding/public subsidy; how funding is secured and documented; how it is dealt with in planning policy; and how affordable housing obligations in section 106 agreements tie in with grant agreements.