Pasadena, CA Accessory Structures: ADU Rules (2026)
ADU rules in Pasadena, CA, also called accessory dwelling unit regulations or granny flat ordinances, cover setbacks, owner-occupancy, parking, and permit requirements.
Key Facts
- Units allowed per lot
- 1 detached ADU + 1 conversion ADU + 1 JADU
- Minimum ADU size
- 150 square feet
- Max detached new construction
- 1,200 square feet
- Max attached height
- 25 feet, two stories
- Building separation
- 6 feet eave to eave
- Review type
- Ministerial, no public hearing
Summary
Pasadena allows one detached ADU, one attached or detached conversion ADU, and one Junior ADU per single-family lot in every zoning district that permits residential use. Section 17.50.275 caps new construction at 1,200 square feet detached and sets height limits between 16 and 25 feet depending on the type.
1.Permitted zones. ADUs are permitted in all zoning districts that permit single-family or multifamily dwelling residential uses on sites with at least one proposed or existing dwelling. ... (1)One detached or attached new construction ADU, one detached or attached conversion ADU, and one Junior ADU, subject to the development standards set forth in 17.50.275 D and E. ... a)New construction detached ADU: Maximum area of 1,200 square feet. b)New construction attached ADU: Maximum area of 850 square feet for a studio or one-bedroom, and 1,000 square feet for more than one bedroom.
Official source re-checked September 7, 2026: no newer edition of the code had been published (publisher’s edition: Code of Ordinances: Supplement 79 Update 2).
Full Breakdown
275 governs both ADUs and Junior ADUs citywide. 1, ADUs are permitted by-right in every zoning district that allows single-family or multifamily residential use, on any lot with at least one existing or proposed dwelling. 1). (3)). c). b). 2).
Violations & Fines
Building an ADU or Junior ADU that exceeds the size or height caps in Section 17.50.275.D, or skips the required six-foot building separation for non-exemption units, means the structure doesn't qualify for ministerial ADU approval and can be red-tagged as unpermitted construction until it's brought into conformance or a modified permit is obtained.
Frequently Asked Questions
How many ADUs can I build on a single-family lot in Pasadena?
What is the maximum size for a new detached ADU in Pasadena?
Does Pasadena require a public hearing to approve an ADU?
Sources & Official References
Other rules in Pasadena
How Pasadena compares: Easiest Cities to Build an ADU·California rules heatmap·Compare Pasadena to another location·View the California accessory structures overview
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ADU Rules in Nearby Cities
How other cities in Los Angeles County handle adu rules.