Pasadena permits ADUs in all residential zones under Ordinance No. 7420 (effective May 20, 2024), with detached units up to 1,200 sq ft and aggressive fee reductions adopted in 2025. Local layers matter: Hillside Overlay districts cap detached ADUs at 1,000 sq ft, historic districts have visibility rules, and the city's Standard Plans program is paused except for Eaton Fire rebuilds.
Zoning & Size Requirements [1][2][3]
| Allowed Zones | All zoning districts that permit single-family or multifamily residential uses, on lots with at least one existing or proposed dwelling (PMC 17.50.275) |
| Max Size (Detached) | 1,200 sq ft (new construction on single-family lots); limited to 1,000 sq ft in most Hillside Overlay districts |
| Max Size (Attached) | 850 sq ft (studio/1-bedroom) or 1,000 sq ft (2+ bedrooms) |
| Max Size (JADU) | 500 sq ft |
| Max Height | Detached: 18 ft / 2 stories (16 ft in Hillside Overlay, Landmark/Historic districts visible from street, or front-setback Exemption ADUs); +2 ft within 1/2 mile of major transit to match primary roof pitch. Attached: up to 25 ft / 2 stories |
| Max Units | Single-family lots: 1 ADU + 1 JADU. Multifamily lots: conversion ADUs up to 25% of existing units + 2 detached ADUs (SB 1211 may allow up to 8 detached on multifamily lots — state law prevails over local cap) |
Setback Requirements [1][2][3]
| Rear Setback | 4 ft for new construction; none for conversions of existing structures |
| Side Setback | 4 ft for new construction; none for conversions; 6 ft eave-to-eave building separation for non-exemption detached ADUs |
| Front Setback | Underlying zone front setback applies, except for 800 sq ft Exemption ADUs |
| Parking Required | 1 space per unit or per bedroom (whichever is less); waived within 1/2 mile of transit, in historic districts, for conversions within existing structures, or with car share within a block — most Pasadena lots qualify for a waiver |
| Owner Occupancy | Not required for ADUs. JADU owner-occupancy removed by AB 1154 (eff. Jan 1, 2026) where the JADU has separate sanitation facilities; still applies to shared-bath JADUs |
| Min Lot Size | None for ADUs under state-mandated pathways |
Permit Process & Fees [4][5]
| Approval Process | Ministerial review — no public hearing. Online e-permitting via Pasadena's permit center; free virtual consultations with planning staff before submitting |
| Review Timeline | 60-day ministerial review; deemed approved if the city fails to act within 60 days (SB 543, eff. Jan 1, 2026) |
| Permit Fees | Roughly $5,000-$15,000 total permitting cost depending on size (builder estimates); flat refundable $1,000 Construction & Demolition deposit. Confirm exact figures with Pasadena Permit Center, (626) 744-7311 |
| Impact Fees | Residential Impact Fee waived for ADUs up to 900 sq ft (expanded July 2025); fully waived at any size with a Housing Agreement. Construction Tax waived for Standard Plan/affordable ADUs and reduced 25% for ADUs up to 900 sq ft |
| Plan Check | 50% plan check fee reduction for Standard Plans or affordability agreements; ~25% overall permitting cost reduction for most ADUs up to 900 sq ft (May 2025 fee package) |
| Pre-Approved Plans | Paused — the city's ADU Standard Plans expired Dec 31, 2025 due to California Building Code updates. Since Jan 1, 2026 the 5 free city designs (374-750 sq ft) may only be used on properties red-tagged in the Eaton Fire; the city is evaluating new plans |
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Construction Costs [6][7]
| Average Build Cost | $180,000-$400,000 |
| Cost per Sq Ft | $300-$500 |
| Garage Conversion | $120,000-$220,000 |
| Prefab ADU (Installed) | $180,000-$300,000 |
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Rental Income Potential [8][9]
| Avg Rent (1 Bedroom) | $2,200-$2,900/mo |
| Avg Rent (2 Bedroom) | $3,200-$3,700/mo |
| Short-Term Rental | No — ADUs/JADUs legally created on or after Jan 1, 2017 must be rented for terms longer than 30 days |
| Est. Annual ROI | 5-8% annual return |
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Recent Law Changes
What's Changed Recently
- Ordinance No. 7420 (adopted April 15, 2024, effective May 20, 2024): comprehensive local ADU ordinance update — 1,200 sq ft detached max, hillside and historic district standards
- HCD review letter (Feb 26, 2025): California HCD found portions of Ordinance 7420 non-compliant with state ADU law; corrections pending — state standards prevail where they conflict
- ADU fee reduction package (announced May 6, 2025; RIF/Construction Tax changes effective July 2025): RIF exemption expanded to 900 sq ft, Construction Tax waived for Standard Plan/affordable ADUs, 50% plan check cut for Standard Plans
- ADU Standard Plans expired Dec 31, 2025 (building code cycle change); from Jan 1, 2026 available only for Eaton Fire red-tagged properties
- SB 543 (eff. Jan 1, 2026): ADU applications statewide deemed approved if the city fails to act within 60 days
- AB 1154 (eff. Jan 1, 2026): JADU owner-occupancy requirement removed statewide for JADUs with separate sanitation facilities
Tips for Building an ADU in Pasadena
- Hillside Overlay (HD) lots have special limits: detached new construction is capped at 1,000 sq ft, attached new-construction ADUs are barred on hillside streets with rights-of-way 26 ft or narrower, and height drops to 16 ft — but conversions of existing space have no size limit
- In Pasadena's historic districts and on designated historic properties, new ADUs must not be visible from the public right-of-way and original windows/doors must be retained — garage and interior conversions are the cleanest path
- Sign a Housing Agreement (affordability covenant) and you get a full Residential Impact Fee exemption at any size plus 50% off plan check — worth modeling if you plan to rent below market anyway
- If your property was red-tagged in the Eaton Fire, the city's 5 pre-approved Standard Plans (374-750 sq ft) remain available at no design cost through the rebuild program
Sources & References
All data on this page is sourced from official government records and verified market data. View our full methodology.
- Accessory Dwelling Units — Pasadena Planning & Community Development Planning Department — Accessed 2026-06-10
- Ordinance No. 7420 amending PMC 17.50.275 (Accessory Dwelling Units) Municipal Code — Accessed 2026-06-10
- HCD Review of Pasadena's ADU Ordinance (Feb 26, 2025) state_law — Accessed 2026-06-10
- City of Pasadena Announces Reduced Fees to Support ADU Construction (May 6, 2025) Planning Department — Accessed 2026-06-10
- ADU Standard Plans Program — Pasadena Planning Planning Department — Accessed 2026-06-10
- ADU Cost Guide Los Angeles 2026 — GreatBuildz Market Data — Accessed 2026-06-10
- Garage Conversion ADU Cost in LA — Ground Up Builders Market Data — Accessed 2026-06-10
- Average Rent in Pasadena, CA — Zumper Rent Research (May 2026) Market Data — Accessed 2026-06-10
- Average Rent in Pasadena, CA — RentCafe (April 2026) Market Data — Accessed 2026-06-10
Frequently Asked Questions
Can I build an ADU in Pasadena?
Yes. ADUs are allowed in All zoning districts that permit single-family or multifamily residential uses, on lots with at least one existing or proposed dwelling (PMC 17.50.275) in Pasadena. The maximum size for a detached ADU is 1,200 sq ft (new construction on single-family lots); limited to 1,000 sq ft in most Hillside Overlay districts. No owner-occupancy is required.
How much does an ADU cost in Pasadena?
ADU construction in Pasadena typically costs $180,000-$400,000. Garage conversions run $120,000-$220,000, and prefab ADUs cost $180,000-$300,000.
How much can I rent an ADU for in Pasadena?
Average ADU rents in Pasadena are $2,200-$2,900/mo for a 1-bedroom and $3,200-$3,700/mo for a 2-bedroom unit.
Do I need parking for an ADU in Pasadena?
1 space per unit or per bedroom (whichever is less); waived within 1/2 mile of transit, in historic districts, for conversions within existing structures, or with car share within a block — most Pasadena lots qualify for a waiver. Check with Pasadena planning department for the latest California ADU parking rules, as many states have relaxed requirements in recent years.
How long does it take to get an ADU permit in Pasadena?
The permit review timeline in Pasadena is 60-day ministerial review; deemed approved if the city fails to act within 60 days (SB 543, eff. Jan 1, 2026). Fees range from Roughly $5,000-$15,000 total permitting cost depending on size (builder estimates); flat refundable $1,000 Construction & Demolition deposit. Confirm exact figures with Pasadena Permit Center, (626) 744-7311.
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