Santa Barbara 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 Barbara Preapproved ADU Program page; sources are listed at the end.

Santa Barbara runs a Preapproved ADU Program that offers ready-made detached ADU designs. The city says preapproved plans get an expedited review and lower permitting costs, but they still need site-specific work. This guide covers what the city says about the program, who to call and what it means if you are selling.

Santa Barbara ADU program at a glance

What does the preapproved program cover?

The program covers detached ADUs only. The city says ADUs are permitted in zones that allow single-unit or multi-unit residential use, and not every preapproved design works on multi-unit properties or historic resources. Its page says none of the listed designs are allowed in historic or landmark districts, on properties with historic resources, or in a front yard.

The plans are described as about 70 to 80 percent complete. Preapproval does not mean the designs already have building permits, so you still contract with the designer, submit site-specific plans and studies, and obtain a permit from the Building & Safety Division.

The steps the city lists

1. Contact the Planning Division to confirm an ADU is allowed on your property.
2. Review the preapproved list and confirm the designer’s role. The city advises having a licensed contractor pull the permits.
3. Apply for a building permit with the Building Permit (BLD) Application and the Preapproved ADU Supplemental Application.
4. Resubmit as requested until plans are approved. The submitted plan must match the approved plan, or a design change goes through a regular ADU application.
5. City staff inspect during construction.

How an ADU affects selling a house in Santa Barbara

A permitted ADU can be a selling point, while an unpermitted one is a disclosure and legalization question. The city’s Code Compliance page lists illegal dwelling units and garage conversions among the issues it handles, so see our Santa Barbara code enforcement guide and building permits guide.

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

1. Confirm what is permitted. Ask the Building & Safety Counter about records for the address.
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 Barbara houses as they are. See how we buy houses in Santa Barbara or read our Santa Barbara cash-offer process.

Santa Barbara’s Preapproved ADU Program

The city runs a Preapproved ADU Program for detached ADUs. It offers standard plans already approved by the city: a detached studio with a sleeping loft at 406 square feet, a detached studio at 526 square feet, and a state-approved, factory-built, foundation-only one-bedroom, one-bath unit at 740 square feet.

Applicants get a 25% reduction in the plan check fee, though construction and inspection fees still apply.

The city lists these steps: contact the Planning Division to confirm an ADU is allowed on your lot, review the preapproved list, apply for a building permit, go through plan check, receive approval, and pass inspections. It says plan check is generally completed within 10 business days.

Unpermitted ADUs and garage conversions

The city’s building forms list includes a process for legalizing unpermitted ADUs and JADUs, and its Code Compliance team lists illegal dwelling units, including garage conversions, among the violations it investigates.

If you are selling a house with a converted garage or backyard unit that was never permitted, ask the Planning Division whether it can be legalized before you list. A cash buyer can also purchase the house with the unit 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 Barbara ADU FAQ

What is Santa Barbara’s preapproved ADU program?

It is a city program offering preapproved detached ADU designs with an expedited review and lower permitting costs. The designs still need site-specific plans and a building permit.

How long does plan check take for a preapproved ADU?

The city says plan check is generally completed within 10 business days, and plan check fees are reduced by 25 percent.

Can I use a preapproved design in a historic district?

The city says none of the listed designs are allowed in historic or landmark districts or on properties with historic resources.

Can I sell a Santa Barbara 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.

How big are Santa Barbara’s preapproved ADUs?

The city’s program lists plans of 406, 526 and 740 square feet.

Is there a discount on preapproved ADU plans?

Yes. The city says applicants pay a plan check fee reduced by 25%, and construction and inspection fees still apply.

How long does preapproved ADU plan check take?

The city says plan check is generally completed within 10 business days.

Sources

• City of Santa Barbara: Preapproved ADU Program

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