Accessory Structures in Pasadena, CA: What Residents Actually Need to Know

If you live in Pasadena or are thinking about moving there, accessory structures are one of those things you probably won't think about until they affect you directly. Pasadena has 9 specific rules on the books covering different aspects of accessory structures, and some of them might surprise you.

Tiny Homes

Tiny homes on wheels are not permitted as permanent dwellings in Pasadena. Fixed tiny homes on a foundation may qualify as ADUs under CA Gov Code 65852.2. Detached ADUs limited to 17 ft ridgeline height and one story.

Key details: On Wheels: Not allowed as dwelling. On Foundation: May qualify as ADU. ADU Height: 17 ft ridgeline, one story. State Law: CA Gov Code 65852.2.

Unpermitted dwellings: removal or retroactive permitting. Zoning violations: fines and required relocation. Occupancy without certificate: prohibited.

ADU Permits

Pasadena processes ADU and JADU applications ministerially under Pasadena Municipal Code (PMC) §17.50.275 and California Government Code §65852.2. Updated ADU regulations took effect May 20, 2024 under Ordinance No. 7420. The California Department of Housing and Community Development (HCD) issued review findings on February 26, 2025 directing further compliance updates. Standard ADUs receive ministerial review with a 60-day decision deadline once the application is complete.

Key details: Code Section: PMC §17.50.275. Updated: Ordinance 7420, eff. May 20, 2024. Review: Ministerial, 60-day cap. Rear Setback: 10 ft (new construction). Zones: RS, RM with single-family use.

Constructing an ADU without permits violates PMC §17.50.275 and the building codes adopted under PMC Title 14, exposing the owner to stop-work orders, code enforcement under PMC Title 1, double permit fees on after-the-fact applications, and refusal of utility service. Unpermitted ADUs cannot use the ministerial path until properly permitted.

Pasadena is more permissive than most cities when it comes to adu permits. That said, there are still limits.

ADU Owner Occupancy

Pasadena cannot require owner occupancy on standard ADUs permitted after January 1, 2020 because California Government Code §65852.2(a)(6), made permanent by AB 976 (2023), preempts local owner-occupancy mandates. Junior ADUs (JADUs) under PMC §17.50.275 still require owner occupancy of either the primary dwelling or the JADU because they share walls and utilities, memorialized by deed restriction. AB 1033 condo conversion has not been adopted by Pasadena as of the date of this article.

Key details: Standard ADU: No owner occupancy (state preempts). JADU: Owner occupancy required. State Law: Gov. Code §65852.2(a)(6); AB 976. Deed Restriction: Recorded at JADU permit. Condo Conversion (AB 1033): Not adopted by Pasadena.

Standard ADU owner-occupancy is preempted by state law — Pasadena cannot enforce it. JADU owner-occupancy violations can result in Certificate of Occupancy revocation, code enforcement under PMC Title 1, and breach of the recorded deed restriction. Misrepresenting JADU occupancy on permit applications is permit fraud and can void the permit.

If you are coming from a city with tighter rules, you will find Pasadena gives residents more flexibility on adu owner occupancy.

ADU Impact Fees

Pasadena exempts ADUs under 750 square feet from all impact fees per California Government Code §65852.2(f)(3) and extends the exemption to ADUs up to 900 square feet from the city's Residential Impact Fees (RIFs) and Construction Tax. Reduced citywide RIFs and Construction Tax for larger ADUs took effect July 17, 2025. ADUs using Pasadena's Standard Plans qualify for additional permit-fee waivers.

Key details: Under 750 sq ft: All impact fees waived (state law). Under 900 sq ft: RIFs + Construction Tax waived (city). Standard Plans: Added permit-fee waivers. Affordable Covenant: All RIFs waived, any size. Reduced Fees Effective: May 6 / Jul 17, 2025.

Misrepresenting ADU square footage to claim the under-900 exemption is permit fraud and can void the Certificate of Occupancy. Failure to pay required impact fees results in permit denial and refusal of utility connection. Post-issuance audits can result in retroactive fee assessments.

Pasadena is more permissive than most cities when it comes to adu impact fees. That said, there are still limits.

ADU Rental Restrictions

Pasadena ADUs permitted after January 1, 2020 must be rented for terms of 30 days or more under California Government Code §65852.2(a)(7). Short-term rental of ADUs is generally not available because PMC §17.50.296 (Ordinance No. 7317) requires the host to occupy the property as a primary residence for at least nine months per year, and prohibits vacation rentals citywide. ADUs covered by Pasadena's Measure H rent stabilization (built before Feb 1, 1995, or otherwise within scope) may also have rent-cap obligations.

Key details: Long-Term (30+ days): Permitted, no separate license. STR Permit: PMC §17.50.296 (Ord. 7317). Owner Occupancy: 9+ months/year required. Un-Hosted Cap: 90 days/year. Vacation Rentals: Prohibited citywide.

Operating an ADU as an unpermitted short-term rental violates PMC §17.50.296 and Cal. Gov. Code §65852.2(a)(7), with citations under PMC Title 1, daily administrative fines, and orders to cease operations. Failure to remit TOT and TBID is separately enforceable. Repeat violations can result in nuisance abatement and civil enforcement. Hosting platforms (Airbnb, VRBO) collect TOT/TBID automatically and report listings to the city.

This is one of the stricter rules in Pasadena's municipal code. If you are unsure whether your situation complies, it is worth checking with the city before proceeding.

Carport Rules

Carports in Pasadena require a building permit and must comply with zoning setback and lot coverage standards per Title 17 Zoning Code. Design must be consistent with the residential character of the neighborhood.

Key details: Permit: Building permit required. Setbacks: Must meet zone standards. Lot Coverage: Counts toward maximum. Code: PMC Title 17 Zoning Code.

Unpermitted carports: stop-work orders, required removal or retroactive permitting with penalty fees. Fines $200 to $1,000.

ADU Rules

Pasadena allows ADUs under California state law (AB 68, SB 13, AB 881). Both attached and detached ADUs are permitted. The city has streamlined its permitting process to comply with state mandates.

Key details: Detached ADU: Up to 1,200 sq ft. Junior ADU: Up to 500 sq ft. Setback: 4 feet for detached ADU. Parking: None required near transit.

Building ADUs without permits results in building code violations and required permitting before occupancy.

Garage Conversions

Garage conversions to ADUs in Pasadena are streamlined under California law. Converting existing garage space to living quarters does not require replacement parking. Building permits are required.

Key details: Permit: Building permit required. Replacement Parking: Not required under CA law. Building Code: Must meet habitable space standards. Setbacks: Existing nonconformities grandfathered.

Unpermitted conversions face building code violations and required permitting before occupancy.

Shed Rules

Pasadena allows sheds under 120 square feet without a building permit. Larger sheds require permits. All sheds must comply with zoning setbacks and height limits.

Key details: Permit Threshold: Under 120 sq ft, no building permit. Setbacks: Typically 5 ft from property lines. Front Yard: Sheds not permitted. Historic Districts: Design review may apply.

Sheds violating setbacks receive code compliance notices. Unpermitted larger sheds must obtain permits or be removed.

The Bottom Line

Compared to many U.S. cities, Pasadena gives residents more room on accessory structures. 3 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 Pasadena'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.