Pittsburgh's Accessory Structures: The Rules That Matter

Every city handles accessory structures a little differently. In Pittsburgh, Pennsylvania, there are 9 distinct rules that residents and property owners should be aware of. Some are stricter than what neighboring cities enforce, and others are more relaxed. Here is what you need to know.

Carport Rules

Pittsburgh permits carports as accessory structures under Zoning Code Ch. 912. Carports go in rear and side yards only; front-yard placement is generally prohibited. Building permit required.

Key details: Permitted Yards: Rear and side yards only. Front Yard: Generally prohibited (must meet primary setback). Height Limit: One story for detached accessory structures. Permit Required: Building permit from PLI. Code Reference: Zoning Code Ch. 912.

Building without a permit: stop-work order plus fines of $100 to $500 per day. Setback violations may require removal or modification. PLI enforces through the Zoning Board of Adjustment process.

Tiny Homes

Pittsburgh allows permanent tiny homes on foundations meeting PA UCC standards. ADUs up to 1,000 sq ft and 15 ft tall are permitted. Minimum habitable room is 70 sq ft. Homes on wheels are not allowed.

Key details: Minimum Room Size: 70 sq ft under PA UCC. ADU Size Cap: 1,000 sq ft and 15 ft height. Tiny Home on Wheels: Not permitted as permanent dwelling. Building Permit: $550 – $1,100 through PLI. Code Reference: Zoning Code Title 9 / PA UCC.

Occupying an unpermitted dwelling: PLI enforcement with fines of $100 to $500 per day. Using a THOW as a permanent dwelling: zoning violation subject to removal order. Failure to meet UCC standards: stop-work order and permit revocation.

ADU Permits

Pittsburgh permits Accessory Dwelling Units under Pittsburgh Code Title 9 (Zoning Code) Section 911.04.A.10. ADUs are permitted as accessory uses in many residential districts (R1A, R1D, R2, R3) subject to dimensional standards. Building, electrical, and plumbing permits are filed through the Department of Permits, Licenses and Inspections (PLI) via OneStopPGH.

Key details: Code Authority: Title 9 Sec. 911.04.A.10. Permitted Districts: R1A, R1D, R2, R3. Max ADU Size: 600-800 sq ft typical. Filing Portal: OneStopPGH. State Preemption: None (PA local control).

Building or occupying an ADU without permits violates Pittsburgh Code Title 9 (Zoning) and Title 1006 (Building Code), triggering Notice of Violation, stop-work orders, daily civil fines up to $1,000 per day under Section 923.04, and required removal or restoration. Unpermitted electrical or plumbing work also violates Pennsylvania licensure statutes. Historic district violations carry separate HRC enforcement.

ADU Rental Restrictions

Pittsburgh requires a Rental Registration for all rental units including ADUs under Pittsburgh Code Title 7 Chapter 781. Pennsylvania Act 50 (1990) preempts municipal rent control. Short-term rentals are regulated under Title 7 Sec. 781.07 and require separate registration. ADU long-term rentals have no minimum lease term beyond Pennsylvania Landlord-Tenant Act defaults.

Key details: Rental Registration: Required (Title 7 Ch. 781). Rent Control: Preempted by PA Act 50. STR Registration: Required. Allegheny Hotel Tax: 7% on STR. PA Hotel Tax: 6% on STR.

Operating without Rental Registration carries fines $100-$1,000 per violation under Title 7 Chapter 781. STR violations carry escalating fines and possible registration revocation. Failure to remit hotel taxes triggers PA Department of Revenue and Allegheny County Treasurer enforcement. HOA covenant violations are enforced civilly per declaration.

ADU Owner Occupancy

Pittsburgh does not require owner-occupancy for ADUs under Title 9. The city imposes no residency restriction on ADU property owners. HOAs governed by the Pennsylvania Uniform Planned Community Act (UPCA, 68 Pa.C.S. 5101) may impose owner-occupancy through covenants. Most Pittsburgh row-house and bungalow lots are fee-simple without HOAs.

Key details: City Rule: No owner-occupancy required. Condo Law: 68 Pa.C.S. Sec. 3101 (UCA). Planned Community Law: 68 Pa.C.S. Sec. 5101 (UPCA). Most Pgh Lots: Fee-simple, no HOA. Court: Allegheny County Common Pleas.

No city enforcement of owner-occupancy. HOA and condo association violations may result in fines per declaration, typically $50-$500 per violation, and lien rights for unpaid assessments under 68 Pa.C.S. 3315 (UCA) and 68 Pa.C.S. 5315 (UPCA). Civil litigation through Allegheny County Court of Common Pleas is available for declaration enforcement.

The rules around adu owner occupancy in Pittsburgh lean permissive, but that does not mean anything goes.

ADU Impact Fees

Pittsburgh does not impose municipal development impact fees on residential ADUs. Pennsylvania's Municipalities Planning Code Section 503-A authorizes impact fees only for transportation improvements, and Pittsburgh has not enacted any. PLI permit fees are scaled to construction value. Pittsburgh Water and Sewer Authority (PWSA) tap fees apply only if new water/sewer service is needed.

Key details: Municipal Impact Fees: None. Building Permit: ~$7-$12 per $1,000 valuation. PWSA Tap Fee: $3,000-$8,000 if new service. School Impact Fee: Not authorized in PA. HRC Fee: $100-$300 if historic.

Failure to pay permit fees prevents permit issuance and inspection scheduling. Tapping into water or sewer without authorization violates PWSA Rate Schedule and triggers fines plus disconnection. Bypassing permits triggers back-permit fees with double-fee penalties under Title 1006.

If you are coming from a city with tighter rules, you will find Pittsburgh gives residents more flexibility on adu impact fees.

Shed Rules

Pittsburgh requires building permits for sheds and accessory structures. Permit fees range from $50–$300. Sheds, lean-tos, carports, playhouses, and similar structures are permitted accessory uses under Pittsburgh Zoning Code Chapter 912. Location, setback, and size restrictions apply per zoning district.

Key details: Permit Required: Yes — Pittsburgh PLI (fee $50–$300). Code Section: Chapter 912 — Accessory Uses and Structures. Processing Time: ~2 weeks. Contact: Pittsburgh PLI (412) 255-2175.

Unpermitted structure: retroactive permit with penalty. Non-compliant setback: modification or removal. Habitation: immediate correction.

Garage Conversions

Garage conversions to living space in Pittsburgh require a building permit and PA UCC compliance. Zoning approval (Certificate of Occupancy) is required if the use changes to habitable space. Additional parking must be considered when a garage is removed from its parking function.

Key details: Permit: Building permit required — PA UCC. Certificate of Occupancy: Required before occupying converted space. Parking: Zoning may require off-street parking replacement. Contact: Pittsburgh PLI (412) 255-2175.

Unpermitted conversion: code enforcement, stop-work order. Must bring to code or restore to garage. Safety violations: immediate correction.

ADU Rules

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.

Key details: Permitted: ADU Overlay Districts — by right. Lot Size: ~10,000 sq ft minimum in many zones. Draft Law: Expanded ADU legislation pending (Dec 2024). Utilities: Must connect to public water/sewer.

Unpermitted ADU: stop-work order and fines. Occupancy without certificate of occupancy: $100–$500/day.

The Bottom Line

Compared to many U.S. cities, Pittsburgh gives residents more room on accessory structures. 2 of the 9 rules here are rated permissive. But permissive does not mean unregulated. There are still requirements, and the city does enforce them when violations are reported.

All of the above reflects Pittsburgh's municipal code as of our last review. If you need specifics on fines, exemptions, or filing requirements, the detailed ordinance pages linked above have the full breakdown.