ADU rules in Pittsburgh, PA — also called accessory dwelling unit regulations or granny flat ordinances — cover setbacks, owner-occupancy, parking, and permit requirements.
Pittsburgh allows ADUs in ADU Overlay Districts and certain residential zones. As of December 2024, draft ADU legislation was before the Planning Commission to expand ADU rights. Minimum lot size of approximately 10,000 sq ft commonly required. PA UCC permits and inspections required. ADUs must connect to public water/sewer.
Pittsburgh's ADU Overlay Districts govern where ADUs are permitted by right. Outside overlay areas, ADUs may require a conditional use or variance. The December 2024 draft legislation proposes broader ADU allowances citywide. All ADUs must comply with the International Building Code and local zoning requirements.
Unpermitted ADU: stop-work order and fines. Occupancy without certificate of occupancy: $100–$500/day.
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Side-by-side rule comparisons with other cities in Allegheny County.
See how other cities in Allegheny County handle adu rules.
See how Pittsburgh's adu rules rules stack up against other locations.
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