Accessory Structures in Delaware County, PA (2026)
1 rule for unincorporated Delaware County, Pennsylvania.
Verified from official government sources
Note: These county rules apply to unincorporated areas of Delaware County. If you live within an incorporated city, that city's own rules apply: see the city list below.
ADU Rules
Delaware County does not regulate accessory dwelling units. Under Pennsylvania's Municipalities Planning Code, zoning (including whether an ADU or in-law suite is allowed) is set by your borough, township, or city. Check your local zoning ordinance.
ADUs Are Set by Your Municipality, Not the County
Some Restrictions53 P.S. §10603(b)(2)
Zoning ordinances may permit, prohibit, regulate, restrict and determine ... Size, height, bulk, location, erection, construction, repair, maintenance, alteration, razing, removal and use of structures.
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