Accessory Structures in Chester County, PA (2026)

5 rules for unincorporated Chester County, Pennsylvania.

Verified from official government sources

Note: These county rules apply to unincorporated areas of Chester County. If you live within an incorporated city, that city's own rules apply — see the city list below.

ADU Rules

Chester County does not regulate accessory dwelling units. Whether an ADU or in-law suite is allowed, and its size and setbacks, is decided by your borough or township zoning ordinance under the PA Municipalities Planning Code.

ADU Rules Are Set by Your Township, Not the County

Some Restrictions

Full ordinance details →Official source ↗

Shed Rules

Chester County sets no countywide shed rule. Size thresholds for a permit, side and rear setbacks, and maximum height for a backyard shed are all controlled by your borough or township zoning ordinance.

Shed Permits and Setbacks Are a Township Matter

Some Restrictions

Full ordinance details →Official source ↗

Garage Conversions

Chester County does not regulate garage conversions. Converting a garage to living space requires a building permit and zoning compliance from your borough or township, plus adherence to the Pennsylvania Uniform Construction Code.

Garage Conversions Follow Township Zoning and State Code

Some Restrictions

Full ordinance details →Official source ↗

Carport Rules

Chester County has no carport ordinance. Whether a carport is permitted, its setbacks, and whether a permit is needed are governed by your borough or township zoning ordinance under Pennsylvania's planning code.

Carport Rules Come From Your Municipality

Some Restrictions

Full ordinance details →Official source ↗

Tiny Homes

Chester County does not have tiny-home rules. Whether a tiny house on a foundation or on wheels is allowed depends on your borough or township zoning ordinance and the Pennsylvania Uniform Construction Code.