Carlsbad ADU Regulations

• ✓ADU Permit Ready Program — free pre-approved plan sets with major time and cost savings
• ✓Dedicated ADU Information Bulletin lays out all development standards in one PDF
• ✓Coastal Development Permit may be required west of I-5 (AB 462 60-day clock applies)
• ✓JADU pathway summarized directly on the city ADU landing page

Standard ADU sizes follow state minimums; JADUs are explicitly capped at 500 sq ft. Other footprint, height, and setback details live in the City’s ADU Information Bulletin.

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.

Parking triggers depend on transit proximity and project type. Confirm with Community Development; the Information Bulletin is the canonical source.

Permits are processed by the Building / Community Development division per the ADU Information Bulletin and the Master Fee Schedule referenced on the city’s ADU page.

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.

Many ADUs are exempt from impact fees. The city publishes a broad permit-fee range tied to its Master Fee Schedule.

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 Carlsbad ADU page (link in hero) for current eligibility and downloads.

Standard ADUs in Carlsbad: 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).