ADU Rules in La Mirada.
Local ADU regulations, permit fees, setback requirements, and typical timelines for La Mirada. Last updated 2026-05-27.
La Mirada ADU Requirements
Attached ADU: up to 25 ft
Metro bus and proximity to Metrolink Buena Park station.
Design 4 weeks · Permit 5 weeks · Build 36 weeks
Plain-language summary
In La Mirada, a detached ADU requires a minimum 4-foot side setback and 4-foot rear setback. The maximum height for a detached ADU is 16 feet, while an attached ADU may be up to 25 feet. The maximum size for a detached ADU is 1,200 sq ft; a Junior ADU (JADU) is limited to 500 sq ft. Replacement parking is not required for most projects. Typical permit fees range from $5,500 to $11,000. A typical project takes approximately ~10 months from design start to move-in, including 4 weeks of design, 5 weeks for permit review, and 36 weeks of construction.
⚠️ ADU rules change frequently. Always verify current requirements with the La Mirada Building & Safety Department before submitting plans. Official source →
What to Watch Out For
- La Mirada is a planned suburban community; HOAs are common in many tracts — review CC&Rs.
- Flat terrain throughout makes ADU siting straightforward in most cases.
How Long Does It Take to Get an ADU Permit in La Mirada?
Site study, floor plans, elevations, structural drawings.
Plan check, corrections, and permit issuance by La Mirada Building & Safety.
Foundation, framing, MEP rough-in, finishes, final inspection.
A licensed engineer on your lot, free.
30 minutes. We walk the property, figure out what's feasible, and answer any questions you have.
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