The Intermunicipal Subdivision and Development Appeal Board (ISDAB) hears appeals from people who have been affected by development authority or subdivision authority decisions. 

The Town of Black Diamond is part of an Intermunicipal SDAB, with Board members available from the Towns of Black Diamond, Turner Valley and the Village of Longview.  Each town is required to provide their own Secretary for each hearing, but may gather board members from the available pool to make quorum.  All 3 municipalities have passed Bylaw 15-06 to establish this intermunicipal board, in accordance with the Municipal Government Act, and an agreement has been authorized by all three Councils.