Accessory Dwelling Units in Laguna Beach

An accessory dwelling unit is an additional home on a lot with a main home, with its own kitchen, bathroom, living area and entrance. This guide summarizes what the city, its ADU ordinance and the state’s housing department publish. It is not legal advice; confirm anything about your lot with Planning.

ADUs and JADUs

• ADU: A unit that is attached to the main home, detached from it or converted from existing space.
• JADU: A junior ADU. The city limits it to 500 square feet, inside an existing or proposed single-family home, with at least an efficiency kitchen. An attached garage counts as part of the home.

Without a coastal permit, a building permit alone covers a converted ADU and a JADU on a single-family lot, or a detached ADU of up to 800 square feet with 4-foot side and rear setbacks. Multifamily lots follow separate rules.

Which rules apply

Three layers apply: state law, Chapter 25.17 of the municipal code and the city’s certified Local Coastal Program. The city’s FAQ says state law requires ministerial approval, but processing must still comply with the Coastal Act, and the Coastal Zone covers all of Laguna Beach except the Sycamore Hills area.

The 2025 urgency ordinance

On March 11, 2025 the City Council adopted Urgency Ordinance No. 1713, which repealed and replaced Chapter 25.17 to follow changes in state law and took effect immediately. On October 28, 2026 the city’s code website said the urgency ordinance remains in effect for applications filed on or after March 12, 2025, and listed it as expiring December 9, 2026. A regular ordinance adopted March 25, 2025 (No. 1715) was listed as pending Coastal Commission certification.

The chapter text printed under that notice is the older 2023 version. The standards below come from the urgency ordinance and HCD; confirm them with Planning at (949) 497-0713, especially after December 9, 2026.

How the process works

1. Check your lot. Ask Planning whether it is in the Coastal Zone or a wildland-urban interface area, and which path your type of unit follows.
2. Apply through the Public Permit Portal. Complete the city’s planning application, register for the portal and upload plans.
3. Get the Coastal Development Permit if you need one. In the Coastal Zone, an ADU that creates new livable space needs one before a building permit can issue. Converting existing livable space in a legally established home is exempt, and the city’s FAQ says a JADU is exempt. The permit can be a de minimis waiver, a minor development permit or a standard permit with a hearing, with mailed notice to neighbors. The city says it cannot weigh private views.
4. Wait for review. Without a coastal permit, the city has 60 days from a complete application to approve or deny it. The city’s FAQ says coastal permits follow Permit Streamlining Act timelines; HCD says state law sets 60 days for those too when a home already stands on the lot.
5. Pull the building permit and build. The building permits guide covers the portal, inspections and design review.

An ADU that does not meet the ordinance’s objective standards may still be allowed with a conditional use permit.

Standards in the urgency ordinance

The size, setback, design and parking rules below apply to ADUs that need the city’s ADU permit. The height, rental and occupancy rules apply to ADUs approved under the ordinance generally.

• Size: 850 square feet for a studio or one bedroom, 1,000 for two or more. An attached ADU is also capped at half the existing home’s floor area, but never below 800 square feet, the size HCD says local rules cannot block.
• Setbacks: 4 feet on the sides and rear and 10 feet in front, or none when rebuilding an existing structure in place.
• Height: 16 feet for a detached ADU, or 18 feet within a half-mile walk of a major transit stop or high-quality transit corridor, plus up to 2 feet to match the main home’s roof pitch. An attached ADU may reach 25 feet or the zone’s limit, whichever is lower, and two stories.
• Design: Materials, colors and roof slope match the main home, exterior lights are fully shielded and aimed down, and windows may not look directly onto a neighboring home unless screened.
• Parking: One space per ADU, with exceptions that include a half-mile walk to public transit, conversions and a car share stop within one block.
• Coastal Zone extras: Parking removed for the ADU is replaced on the lot. The ADU keeps 25 feet from the top of an oceanfront bluff and from a watercourse centerline, and may not have a roof deck.
• Rental and sale: No rental shorter than 30 days and no separate sale. The short-term rental guide covers the city’s lodging rules.
• Owner occupancy: ADUs created on or after January 1, 2020 carry no owner-occupancy rule. The ordinance requires an owner to live in the main home or the JADU on every lot with a JADU, backed by a recorded deed restriction. HCD says state law requires that only when the JADU shares sanitation facilities with the main home, so ask Planning how the city applies it.

Fire and wildfire rules

Chapter 14.70 of the municipal code adopts the California Wildland-Urban Interface Code for the exterior of new buildings, additions, alterations and repairs in wildland-urban interface areas, with local amendments such as a Class A roof and a 144-square-inch limit on each vent opening.

The ordinance requires sprinklers in an ADU only when the main home must have them, and an ADU does not trigger sprinklers in the existing home. HCD says a High Fire Hazard Severity Zone is not by itself a conclusive reason to restrict ADUs. The emergency alerts and wildfire guide covers evacuation zones and brush clearance.

Fees and money

• Impact fees: The ordinance charges none on an ADU under 750 square feet, and HCD says state law bars them on an ADU of 750 square feet or less. Above that, fees are charged in proportion to the size of the main home. Impact fees do not include water or sewer connection charges.
• Utility connections: A converted ADU on a single-family lot needs no new connection or connection fee. An ADU built with a new home needs its own connection and pays normal fees. Other ADUs may add a connection at a proportionate fee. Ask the providers in the utilities guide.
• Fee refunds: The city’s housing page offers fee refunds for a 10-year commitment to affordable rent, citing section 25.17.070, which the urgency ordinance’s chapter does not contain. Ask Planning whether the refund still applies.
• Loan program: The city’s housing page links the Orange County Housing Finance Trust’s Affordable ADU Loan Program interest list.
• Rent estimate: If you plan to rent the unit, the ordinance asks for a projected rent with the building permit application, which the city says helps it earn affordable housing credit.

Unpermitted units

The city says an owner can get a confidential inspection by a licensed contractor before applying to legalize a unit. The urgency ordinance limits when the city can deny a permit to legalize an unpermitted ADU built before January 1, 2018. HCD’s handbook says state law now uses January 1, 2020 for that rule, so ask Planning which date applies.

Questions about a purchase

If you are weighing a property with an ADU, ask the seller for the permit and final inspection and ask Planning about its status. For homes and brokers, Realatrends Real Estate publishes this site at realatrends.com. The renting guide covers tenant rules, and the housing programs guide covers city programs.