ADU Rules in Pasadena, CA (2026)
ADU rules, permit requirements, size limits, and fees for Pasadena, CA. Source-cited from official municipal code.
Yes, ADUs are allowed in Pasadena, CA.
Pasadena, CA permits accessory dwelling units (ADUs) on residential properties. ADUs — also called granny flats, in-law units, backyard cottages, or secondary suites — are secondary housing units on a single-family or multifamily lot. California state law actively preempts local restrictions, making ADU approval a streamlined ministerial process. In Pasadena, the Pasadena Planning and Community Development Department — Building Division handles ADU permit applications. Below you will find the current size limits, setbacks, fees, and timeline for building an ADU in Pasadena.
ADU Size Limits
ADU Size Limits in Pasadena: Detached ADU: up to 1200 sq ft (max height: 18 feet). Attached ADU: 50 percent of the existing primary dwelling. Junior ADU (JADU): up to 500 sq ft — must be within the existing primary dwelling or accessory structure. Detached ADU maximum 1,200 sqft per California Gov Code §66314(d)(5) (Stats. 2024 Ch. 7 §20). JADU maximum 500 sqft within existing primary structure per Gov Code §66333 (Stats. 2024 Ch. 7 §20). Pasadena's many large Craftsman bungalows and estate homes have rear yards and garages well-suited for ADU conversion. Pasadena Zoning Code Section 17.50.030.
| Type | Max Size | Max Height |
|---|---|---|
| Detached ADU | 1200 sq ft · Verified June 4, 2026 · Source | 18 feet · Verified June 4, 2026 · Source |
| Attached ADU | 50 percent of the existing primary dwelling · Verified June 4, 2026 · Source | See official source |
| JADU | 500 sq ft · Verified June 4, 2026 · Source | Within existing structure |
Permit Fees
ADU Permit Fees in Pasadena: Plan check fee: $700–$4,000 depending on project value. Building permit fee: $1,200–$5,500 depending on valuation. Impact fees: None. School fees: Exempt for ADUs under 750 sqft. ADUs 750+ sqft subject to Pasadena Unified School District developer fees.. Total estimated permit cost: $2,500–$10,000 total permit fees. Impact fees waived for ADUs under 750 sqft per Gov Code §66323 (Stats. 2024 Ch. 7 §20). Pasadena Water and Power (PWP) connection fees for new services. Historic District design review fees may add $500–$2,000 for Cultural Heritage Commission review. Fee schedule: https://www.cityofpasadena.net/planning/permits-fees/
| Fee Type | Amount |
|---|---|
| Plan Check | See official source |
| Building Permit | See official source |
| Impact Fees | None |
| School Fees | See official source |
| Total Estimate | See official source |
Permit Timeline
Pasadena ADU Permit Timeline: The permitting agency shall either approve or deny the application to create or serve an accessory dwelling unit within 60 days from the date the permitting agency receives a completed application if there is an existing single-family or multifamily dwelling on the lot. Apply through the Pasadena Planning and Community Development Department — Building Division online permit portal. Phone: (626) 744-4200.
Setback Requirements
ADU Setback Requirements in Pasadena: Front setback: front-yard setback requirements of the underlying zone. Side setback: 4 feet. Rear setback: 4 feet. 4-foot side and rear setbacks for new detached ADUs per California Gov Code §66314(d)(7) (Stats. 2024 Ch. 7 §20). Pasadena RS-4 zones typically require 20-25 ft front setbacks for primary dwellings. Corner lot ADUs must meet both street frontage setbacks. Historic Districts have design guidelines — exterior materials must be compatible but setbacks follow state law minimums.
Parking Requirements
Parking Requirements: No additional parking required for ADUs within one-half mile of Metro Gold Line (A Line) stations (Del Mar, Memorial Park, Fillmore, Sierra Madre Villa) or Foothill Transit bus routes. No replacement parking when garage converted to ADU. Per California Gov Code §66322(a)(1) and §66314(d)(11) (Stats. 2024 Ch. 7 §20).
Restrictions & Requirements
How Many ADUs Are Allowed?
Number of ADUs Allowed in Pasadena: Single-family lots: 1 ADU + 1 JADU per single-family lot. Multifamily properties: Up to 25% of existing units (minimum 2) as detached ADUs; non-livable space conversions by-right per state law. Pasadena's large-lot RS-4 estates often accommodate both a detached garage conversion ADU and a new detached ADU simultaneously, maximizing rental income potential. CalTech and JPL proximity creates strong demand for ADU rentals from researchers and students.
Single-Family Lots
Multifamily Properties
State Law & Preemption
State Preemption: California Government Code Chapter 13 (§§66314–66333, effective January 1, 2025 per Stats. 2024 Ch. 7, SB 477) preempts Pasadena's local ADU restrictions. Pasadena must permit ADUs by-right on all residential lots. Owner-occupancy requirement eliminated per §66315 (AB 68, 2019; Stats. 2024 Ch. 7 §20). Pasadena's 2020 Zoning Code Section 17.50.030 implements state ADU law.
Historic District Considerations
Historic District Requirements: Pasadena has 31 historic districts where additional design review may be required for ADU construction. Design review approval is required before obtaining a building permit for properties in historic overlay zones. Pasadena has 31 City of Pasadena Historic Districts including Bungalow Heaven (1,000+ Craftsman bungalows), Garfield Heights, Madison Heights, Prospect Park, Orange Grove Boulevard, Michigan Boulevard, and the Rose Bowl area. Over 1,000 individual Landmarks are also designated. The Cultural Heritage Commission (CHC) reviews all exterior alterations in Historic Districts and to individual Landmarks. Pasadena is one of California's most architecturally significant cities for early 20th century residential design. The 'Secretary of the Interior's Standards for Rehabilitation' guide CHC review. Certificate of Appropriateness required for exterior alterations — does NOT override state ADU setback/size preemption. Look up historic district boundaries at: https://www.cityofpasadena.net/planning/historic-preservation/
Frequently Asked Questions
Can I build an ADU in Pasadena?
Yes. Pasadena, CA allows accessory dwelling units. On a single-family lot you can build 1 ADU + 1 JADU per single-family lot.
How big can an ADU be in Pasadena?
The maximum size for a detached ADU in Pasadena is 1,200 square feet. A Junior ADU (JADU) can be up to 500 square feet.
How long does it take to get an ADU permit in Pasadena?
The typical ADU permit timeline in Pasadena is The permitting agency shall either approve or deny the application to create or serve an accessory dwelling unit within 60 days from the date the permitting agency receives a completed application if there is an existing single-family or multifamily dwelling on the lot.. Total estimated permit fees are $2,500–$10,000 total permit fees.
Do I need extra parking for an ADU in Pasadena?
Pasadena parking rules for ADUs: No additional parking required for ADUs within one-half mile of Metro Gold Line (A Line) stations (Del Mar, Memorial Park, Fillmore, Sierra Madre Villa) or Foothill Transit bus routes. No replacement parking when garage converted to ADU. Per California Gov Code §66322(a)(1) and §66314(d)(11) (Stats. 2024 Ch. 7 §20).
Do I have to live on-site to have an ADU in Pasadena?
Owner-occupancy requirement in Pasadena: No additional standards, other than those provided in Section 66314, shall be used or imposed, including an owner-occupant requirement.
Source: Pasadena Zoning Code Section 17.50.030 — Accessory Dwelling Units; California Government Code §§66314–66333 (Stats. 2024 Ch. 7 §20). Last verified April 6, 2026. View source