Everything homeowners ask about building an ADU in Pittsburgh — answered with 2026 data.
Not yet in most areas. No ADU use exists in the Zoning Code today: §912.08 (Ord. 32-2018) only ever applied inside a 24-month Garfield overlay that lapsed in 2020. Council Bill 2025-1545 — ADUs by right on any residential lot, 2 per lot, 1,000 sq ft, 30 ft, no owner-occupancy, no parking — got a positive Planning Commission recommendation on June 2, 2026 and goes to a City Council public hearing on September 23, 2026; it is not adopted. Current zoning: None citywide today. §912.08 (Ord. 32-2018) allowed ADUs only inside a 24-month interim Garfield ADU Overlay District that was never made permanent and lapsed in 2020. Pending CB 2025-1545 (Council hearing Sept 23, 2026) would permit ADUs by right on any lot whose primary use is Residential, Community Center or Religious Assembly (§911.02), citywide. Check our full Pittsburgh ADU rules page for the latest status.
ADU construction in Pittsburgh typically costs $135,000-$325,000. The cost per square foot averages $225-$375. Garage conversions are more affordable at $75,000-$140,000, while prefab ADUs cost $140,000-$250,000. Permit fees add PLI 2026 schedule (eff. Jan 1, 2026): residential base permit fee $6.00 per $1,000 of construction value (min $130, max $8,000; 40% due at application) plus $4.50 SETF, $5 records fee and a $2-$25 technology fee; DCP residential zoning review $1.00 per $1,000 (min $50). to your budget. See our detailed Pittsburgh ADU cost guide.
Detached ADUs in Pittsburgh can be up to No ADU can be permitted today. Pending CB 2025-1545 defines an ADU as not greater than 1,000 sq ft. Attached ADUs are limited to Same proposed 1,000 sq ft cap for an ADU inside the house, in a basement or attic, or over a garage. Junior ADUs (JADUs) have a cap of No junior ADU category in Pittsburgh's code or in the pending bill. Maximum height is Pending bill: 30 ft, measured to include the garage when built above a detached garage (proposed §912.08.C.3; the June 2026 version drops the '2 stories' wording). Today an accessory structure in a residential district is capped at 15 ft or 1 story (§912.04.E); the primary structure at 40 ft or 3 stories (§903.03). You are allowed up to Pending: up to 2 ADUs per zoning lot when accessory to a residential use; no cap when accessory to a Community Center or Religious Assembly, with Site Plan Review above 10 units on a qualifying lot.
Rear setback: Accessory structures: 5 ft from the rear lot line, or 2 ft where the rear line abuts a way (alley) (§912.04.B). Primary-structure rear setback is 30 ft in the VL, L and M development subdistricts and 15 ft in H (§903.03). Pending bill: converting a garage that already sits in a rear or side setback needs no Administrator's Exception if it encroaches no further (proposed §912.08.C.5). Side setback: Accessory structures follow the primary side setback (§912.04.C): 5 ft interior side in the L, M and H subdistricts; 5 ft on one side and 10 ft on the other in VL (§903.03). The pending bill exempts ADUs from the Residential Compatibility Standards of Chapter 916 (proposed §912.08.C.4). Front setback: Accessory structures follow the primary front setback (§912.04.A): 30 ft in the VL, L and M subdistricts, 15 ft in H (§903.03), unless a contextual setback applies (§925.06). Neither the current code nor the pending bill contemplates a detached ADU in a front yard. Note that garage conversions may be exempt from setback requirements if the existing structure is already within the setback area.
Today Parking Schedule A (§914.02.A) requires 1 space per unit for single-unit detached and two-unit dwellings (0 for single-unit attached). Pending CB 2025-1545 strikes Schedule A entirely, so no off-street parking would be required for an ADU or any other use. Many cities and states have been relaxing ADU parking requirements in recent years. In California, no additional parking is required for ADUs near transit.
Not required in the pending bill: the June 2, 2026 Planning Commission version strikes the 2018 overlay's owner-must-reside-on-site and deed-restriction clauses (§912.08.E.4 and E.8). Those clauses still sit in the lapsed overlay text, but no ADU can be permitted under it. Note that owner-occupancy rules vary by state law — California and several other states have eliminated this requirement for standard ADUs.
The ADU permit review timeline in Pittsburgh is typically Not published. PLI and City Planning post no review-time targets; most building permits first need a Record of Zoning Approval (ROZA) through OneStopPGH, then PLI plan review. Budget several months and confirm current queues with PLI (412-255-2175). Plan check: Not published. PLI lists a paid Residential Accelerated Plan Review (1.0% of construction value, min $500, max $9,200) but says expedited review is currently offered only for fire alarm and fire suppression permits. Pre-approved plans availability: None. Pittsburgh has no pre-approved ADU plan program; the City's 2024 EngagePGH page shows six illustrative 3D models (attached, detached, attic, basement, above-garage, garage conversion), not permit-ready plans.
Average ADU rental income in Pittsburgh: 1-bedroom units rent for $1,150-$1,700/month, 2-bedroom units for $1,400-$2,050/month. Short-term rentals: Moot until an ADU can be built. The pending ADU text (CB 2025-1545) has no minimum-lease clause (the lapsed 2018 overlay barred leases under 30 days, §912.08.E.2). Expected ROI: Illustrative only: at $1,150-$1,700/mo (HUD FY2027 Small Area FMRs for city ZIPs) a $135,000-$325,000 build grosses back its cost in roughly 10-16 years before taxes, vacancy and financing — and nothing can be permitted .
The minimum lot size for an ADU in Pittsburgh is No ADU-specific minimum proposed. Base-district minimum lot sizes after Ord. 10-2025 (eff. May 7, 2025): 6,000 sq ft (VL), 3,000 (L), 2,400 (M), 1,200 (H) (§903.03). The 2018 overlay exempted ADUs from lot-size rules; the pending §912.08 text does not restate that exemption — confirm with the Zoning Division. This applies to detached ADUs — garage conversions and JADUs may have different or no lot size requirements.
Garage conversions are one of the most popular and affordable ADU options. In Pittsburgh, a garage conversion typically costs $75,000-$140,000. The key advantages are lower cost (no foundation work), potential setback exemptions, and faster permitting. Read our complete garage conversion guide.
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