A Guide to Small-Scale Multi-Unit Housing (SSMUH) Design in the Lower Mainland The single-family lot is officially an endangered species in British Columbia. Under the provincial government’s sweeping Small-Scale Multi-Unit Housing (SSMUH) mandates, zoning regulations across the Lower Mainland have changed permanently. Traditional single-family properties can now legally be redeveloped into high-density duplexes, triplexes, and…