1 county-level rule, plus city-specific rules for 2 cities in Montgomery County, Pennsylvania.
Verified from official government sources
Montgomery County does not regulate accessory dwelling units. Under the Pennsylvania Municipalities Planning Code (Act 247 of 1968), zoning authority is vested in townships, boroughs, and cities — not counties. Each of Montgomery County's 62 municipalities (Norristown, Pottstown, Lower Merion, Upper Merion/King of Prussia, Abington, Cheltenham, etc.) sets its own ADU rules.
2 cities in Montgomery County have their own accessory structures rules. Each link goes to that city's dedicated page with code citations.
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Montgomery County Ordinance Hub →