Accessory Structures in Santa Clarita, CA

If you live in Santa Clarita or are thinking about moving there, accessory structures are one of those things you probably won't think about until they affect you directly. Santa Clarita has 4 specific rules on the books covering different aspects of accessory structures, and some of them might surprise you.

ADU Rules

Santa Clarita reviews accessory dwelling units and junior ADUs through a ministerial Class I application under Section 17.22.090, with substantive standards set in Section 17.57.040(L). A final certificate of occupancy for the ADU cannot issue before the primary dwelling's own final certificate of occupancy.

Key details: Review process: Ministerial Class I application. Governing section: SCMC 17.57.040(L). Minimum rental term: 30 days for ADU and JADU. Certificate of occupancy order: Primary dwelling C of O issues first. JADU sale rule: Cannot be sold separately.

Renting an ADU or JADU for less than the 30-day minimum term, selling a JADU separately from the primary residence, or occupying an ADU before the primary dwelling has received its final certificate of occupancy each violate Section 17.57.040(L) and can result in code enforcement action, correction orders, or revocation of the permit approved under the Class I process.

Shed & Carport Rules

Santa Clarita limits how many detached accessory structures, including sheds, a residential lot may hold and how tall they can be under UDC Section 17.57.040. Lots under 20,000 square feet get one accessory structure, larger lots up to an acre get two, and lots an acre or bigger get three. Height in the UR2 through UR5 zones tops out at 20 feet or the house's height, whichever is less.

Key details: Structures per lot under 20,000 sf: 1 accessory structure/outbuilding. Structures per lot 20,000 sf to 1 acre: 2 accessory structures/outbuildings. Structures per lot 1 acre or more: 3 accessory structures/outbuildings. Max height, UR2-UR5: 20 ft or house height, whichever less. Rental use: Prohibited; not a legal dwelling unit.

Building an accessory structure or shed beyond the per-parcel limit, or without the required height and setback compliance in Section 17.57.040, is a zoning violation enforceable as a public nuisance under Section 1.01.210, and using an accessory structure as a rented living space is expressly barred by subsection (K)(4) of the same section, regardless of the building's floor area.

ADU Rental Restrictions

Santa Clarita requires any accessory dwelling unit that is rented out to be leased for 30 days or longer, per UDC Section 17.57.040(L)(3)(a). The rule blocks short-term and vacation rental use of ADUs built under the city's state-mandated ADU program. Junior ADUs carry the identical 30-day floor plus an owner-occupancy requirement for the main house or the JADU itself.

Key details: Minimum ADU rental term: 30 days or longer. Minimum JADU rental term: 30 days or longer. JADU owner-occupancy: Owner must live in house or JADU. Governing section: UDC § 17.57.040(L)(3). State law basis: Govt. Code § 66323 ADU mandate.

Renting an ADU or JADU for stays under 30 days violates Section 17.57.040(L)(3), and the City can pursue it as a code violation and public nuisance under Section 1.01.210. A JADU owner who stops occupying the property, without qualifying for a Government Code Section 66333(b) exemption, likewise falls out of compliance and risks the same enforcement path.

Compared to other cities, Santa Clarita takes a harder line on adu rental restrictions. The enforcement and penalty structure reflects that.

ADU Impact Fees

Santa Clarita charges accessory dwelling unit development impact fees based on the ADU's square footage relative to the primary home, under UDC Section 17.57.040(L)(5)(a). Owners also pay a separate utility connection fee sized to the ADU's water and sewer burden. The Council sets exact fee amounts by resolution, and state law can override the fee where it applies.

Key details: ADU impact fee basis: Proportional to primary dwelling square footage. Utility connection fee: Proportionate to ADU's system burden. Fee cap: Reasonable cost of providing the service. Fee-setting body: City Council, by resolution. Governing section: UDC § 17.57.040(L)(5).

Development impact and utility connection fees under Section 17.57.040(L)(5) are collected as a condition of the permit process, and the connection fee or capacity charge is capped by the same subsection at the reasonable cost of providing the service, meaning a charge above actual system impact is subject to challenge. Exact fee amounts come from a Council resolution, not the code text itself, so applicants should confirm the current schedule before applying.

The Bottom Line

Santa Clarita's accessory structures rules are a mixed bag. Some areas are strict, others are relaxed, and the details matter. The best approach is to check the specific rule that applies to your situation rather than assuming Santa Clarita is broadly strict or permissive.

Keep in mind that Santa Clarita can amend these rules at any council meeting. For the most current version of any rule mentioned here, check the specific ordinance page, where we track updates as they happen.