Santa Cruz Zoning and ADU Guide for Homeowners and Sellers

Last updated November 13, 2026. Reviewed by the Cash Home Buyers CA team. Information comes from the City of Santa Cruz ADU pages; sources are listed at the end.

Santa Cruz lists four ADU types: detached, attached, conversion and junior ADU. The city says no public hearing or discretionary planning permit is required, but a building permit is. Here are the city’s stated rules and what they mean if you are selling.

Santa Cruz ADU rules at a glance

Process and owner occupancy

A building permit is required, with architectural drawings, energy and green building calculations and inspections. A Land Use Agreement must be recorded, specifying unit size and limiting use as a short-term vacation rental. Owner occupancy is not required for ADUs permitted after January 1, 2020. ADUs first permitted before 2020 require the owner or an eligible immediate family member to occupy one unit, and the City Council may grant temporary exceptions.

On single-family parcels the city allows one detached ADU, one conversion ADU and one junior ADU.

Legalizing an unpermitted ADU

The city lists four steps. First, contact Nancy Concepcion at (831) 420-5112 to review the property and process, after getting Residential Building records from the County Assessor’s office. Second, an optional site inspection applies only to units built before January 1, 2020 where a five-year code delay is requested.

Third, hire a design professional and submit plans and fees. The city says legalization typically finishes within a year of submittal and that only the plans and final building permit legalize the unit. Fourth, complete inspections after the permit is issued.

The five-year deferral, or stay of enforcement, is available for units built before January 1, 2020 that are covered by a notice. The owner completes a checklist and pays $75 to $250 per inspection. The stay is not granted where there is a health and safety concern.

How an ADU affects selling a house in Santa Cruz

A permitted ADU can be a selling point, while an unpermitted one is a disclosure and legalization question. See our Santa Cruz code enforcement guide and building permits guide for the related steps.

How to sell a house in Santa Cruz with an unpermitted unit

1. Confirm what is permitted. Ask the city for permit history and check the Assessor’s records.
2. Weigh legalizing against selling. Legalizing takes plans, fees and inspections.
3. Compare your options. Legalize and list, sell with a credit, or sell as-is to a cash buyer.
4. Disclose honestly. A cash offer does not change what you must disclose.

We buy Santa Cruz houses as they are. See how we buy houses in Santa Cruz or read our Santa Cruz cash-offer process.

Legalizing an unpermitted ADU in Santa Cruz

The city’s ADU pages describe a legalization program for units built without a permit.

They say that under California Assembly Bill 2533, an ADU or junior ADU built before January 1, 2020 without a permit can use a streamlined process to be legalized and confirmed as safe under the Health and Safety Code.

According to the city, no public hearing or discretionary permit is required, except that a Coastal Permit may be needed for some ADUs in the Coastal Zone.

The city also says an unpermitted ADU can be permitted under the building code that was in effect when the unit was determined to have been built, and that nearly all existing unpermitted units are eligible.

The city publishes a submittal guide and checklist and an AB 2533 plan requirements sheet for these applications.

For a seller, that means an unpermitted backyard unit or converted garage may not have to stay a problem. You can ask a planner whether your unit qualifies before you list, or sell to a buyer who will take the house as it stands.

California disclosure rules for ADUs and hazard zones

An unpermitted unit is a material fact you should raise with your agent or escrow officer, since an as-is sale does not excuse non-disclosure under Civil Code section 1102.1. Sellers also disclose whether the parcel sits in any of six natural hazard zones listed in section 1103, and any waiver of that disclosure is void. See our natural hazard disclosure guide for the zones.

Need to talk it through? Call (424) 435-2326 or request a cash offer. There is no cost and no obligation.

Santa Cruz ADU FAQ

How big can a detached ADU be in Santa Cruz?

The city says the larger of 10 percent of net lot area (up to 1,200 sq ft habitable) or 850 sq ft for a studio or one bedroom, or 1,000 sq ft for two or more bedrooms.

Does Santa Cruz require parking for an ADU?

Outside the Coastal Zone, no parking is required. Inside it, one off-street space is required in areas shown on the city’s ADU Parking Required GIS layer.

What is the five-year deferral for an unpermitted ADU?

For units built before January 1, 2020 and covered by a notice, the city offers a stay of enforcement after the owner completes a checklist and pays inspection fees of $75 to $250. It is not granted where there is a health and safety concern.

Can I sell a Santa Cruz house with an unpermitted unit?

Yes. It does not legally stop a sale, but it can slow a traditional one. A cash buyer can purchase the house as it is.

Can an unpermitted ADU be legalized in Santa Cruz?

The city says nearly all existing unpermitted units are eligible for its legalization program, and that under AB 2533 a unit built before January 1, 2020 can use a streamlined process.

Does legalizing an ADU in Santa Cruz need a public hearing?

The city says no public hearing or discretionary permit is required, except that a Coastal Permit may be needed for some ADUs in the Coastal Zone.

Which building code applies to a legalized ADU?

The city says an unpermitted ADU can be permitted under the building code in effect at the time the unit was determined to have been constructed.

Sources

• City of Santa Cruz: Accessory Dwelling Units (ADUs)
• City of Santa Cruz: How to Legalize Your ADU

This guide is general information, not legal advice. Rules change; confirm requirements with the City of Santa Cruz.