Garden Grove publishes detailed multilingual ADU FAQs and rolled out an ADU Go pre-approved program effective January 1, 2025. Notable for a strict single-story 16 ft height cap on new detached ADUs.
New detached ADU generally capped at 16 ft height (single story). Studio/1BR up to 850 sq ft. 2+ BR up to 1,200 sq ft. Attached ADU 1,200 sq ft or 50% of primary, whichever is less. With existing JADU, new ADU max 800 sq ft. Conversions may expand 150 sq ft for ingress/egress.
State guarantee: California requires every city to allow at least an 800 sq ft ADU exempt from local lot coverage, FAR, and front-setback rules.
Height baseline: 16 ft for detached, rising to 18 ft within ½ mile of major transit. Attached ADUs follow the primary home, capped at 25 ft.
One off-street space for new ADUs except within ½ mile of transit or for conversions. Garage/carport conversion to ADU does not require space replacement.
ADU Go pre-approved program rollout effective 1/1/2025. Multilingual PDF handouts (English, Vietnamese, Spanish, Korean) for single- and multi-family.
State backstop: A complete ADU permit must receive a decision in 60 business days. If the city stalls past 30 business days, AB 253 lets you hire a certified private plan checker to force a 10-business-day decision.
FAQ does not list fee waivers. Contact Planning Services (714) 741-5312.
SB 543: No impact fees on ADUs ≤750 sq ft. Above 750 sq ft, fees scale to the ratio of ADU size vs the main home.
Visit the official Garden Grove ADU page (link in hero) for current eligibility and downloads.
Standard ADUs in Garden Grove: no owner-occupancy required (made permanent in 2023).
JADUs: limited to 500 sq ft of interior livable space within an existing single-family home. Owner occupancy is required only when sanitation facilities are shared with the main house. JADUs cannot be used as short-term rentals (AB 1154 / SB 543).
Sketch a floorplan, walk through it in 3D, and have our planners review it for size, height, and setback compliance before you submit to Garden Grove.
Heads up: Local rules change frequently. This page summarizes publicly available state law (California Government Code §§ 66310–66342) and current local guidance for general planning purposes. Always confirm specifics with the Garden Grove planning desk before submitting plans. ADUMetrics does not provide legal advice.