Accessory Structures in Montgomery County, PA (2026)
4 county-level rules, plus city-specific rules for 1 city in Montgomery County, Pennsylvania.
Verified from official government sources
ADU Rules
Montgomery County does no land-use zoning. Whether an accessory dwelling unit is allowed, and its size and setbacks, is decided by your borough or township under the PA Municipalities Planning Code. Check your municipality's zoning ordinance.
ADU rules are set by your PA municipality, not the county
Some Restrictions53 P.S. §10603(b) (MPC Section 603(b))
Zoning ordinances... may permit, prohibit, regulate, restrict and determine:... Size, height, bulk, location, erection, construction, repair, maintenance, alteration, razing, removal and use of structures.
Shed & Carport Rules
Montgomery County sets no shed rule. Whether a shed needs a zoning or building permit, and how far it must sit from lot lines, is decided by your borough or township. Many PA municipalities exempt small sheds under 200 sq ft.
Shed permits and setbacks are a municipal matter
Some Restrictions53 P.S. §10603(b) (MPC Section 603(b))
Zoning ordinances... may permit, prohibit, regulate, restrict and determine:... Size, height, bulk, location, erection, construction, repair, maintenance, alteration, razing, removal and use of structures.
Garage Conversions
Montgomery County has no garage-conversion rule. Whether you can convert a garage to living space is governed by your borough or township zoning ordinance plus the statewide Uniform Construction Code building permit. Check with your municipality.
Garage conversions follow municipal zoning and the state UCC
Some Restrictions53 P.S. §10603(b) (MPC Section 603(b))
Zoning ordinances... may permit, prohibit, regulate, restrict and determine:... Size, height, bulk, location, erection, construction, repair, maintenance, alteration, razing, removal and use of structures.
Tiny Homes
Montgomery County has no tiny-home rule. Whether a tiny house on a foundation is allowed depends on your borough or township zoning and minimum-dwelling standards, plus the statewide Uniform Construction Code. A tiny home on wheels is usually treated as an RV.
Tiny homes are governed by municipal zoning and the state UCC
Some Restrictions53 P.S. §10603(b) (MPC Section 603(b))
Zoning ordinances... may permit, prohibit, regulate, restrict and determine:... Size, height, bulk, location, erection, construction, repair, maintenance, alteration, razing, removal and use of structures.
Accessory Structures by City in Montgomery County
1 cities in Montgomery County have their own accessory structures rules. Each link goes to that city's dedicated page with code citations.
All Montgomery County ordinances
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