Lot splits under SB 9 in San Jacinto: the local rules

Each rule below links to the section of the San Jacinto Municipal Code it was read from, with the code text one click away (checked October 2026). General information, not legal advice.

What San Jacinto's code says

San Jacinto code What San Jacinto's code adds
Unit size	Each unit must be no more than 800 square feet and more than 500 square feet. Applies: Applies to each unit on a lot from an urban lot split, other than an ADU or JADU. § 17.905.040 · code text The total floor area of each residential unit developed on a lot to be split must be less than or equal to 800 square feet and more than 500 square feet. Each unit must be no more than 800 square feet and more than 500 square feet. Applies: Applies to each unit in an SB 9 two-unit project. § 17.910.040 · code text The total floor area of each unit that is developed under this chapter must be: 1) less than or equal to 800 square feet and 2) more than 500 square feet. The dwelling may be expanded up to 800 square feet. Applies: Applies to a legally existing primary dwelling smaller than 800 square feet, after an urban lot split. § 17.905.040 · code text A primary dwelling that was legally established prior to the urban lot split and that is smaller than 800 square feet in floor area may be expanded to 800 square feet in floor area after the urban lot split. The unit may be expanded up to 800 square feet. Applies: Applies to a legally existing unit smaller than 800 square feet, in a two-unit project. § 17.910.040 · code text A unit that was legally established prior to the two-unit project and that is smaller than 800 square feet in floor area may be expanded to 800 square feet in floor area after or as part of the two-unit project.
Setbacks	At least 4 feet from side and rear lot lines. Applies: Applies to two-unit projects. This is the minimum even where a unit may encroach into the standard setback. § 17.910.040 · code text However, in no event may any unit be constructed without at least providing a four foot setback from the side and rear lot lines.
Standards	Only 2 detached dwellings are allowed; no multi-family dwelling. Applies: Applies to two-unit projects. § 17.910.040 · code text Two-unit projects shall only consist of two detached dwellings on a single lot. No more than 2 units of any kind on each lot. Applies: Applies to lots created by an urban lot split. § 17.905.040 · code text No more than two units of any kind are permitted on any lot created by an urban lot split. Each resulting lot must have direct access to the public right-of-way. Applies: Applies to lots resulting from an urban lot split. § 17.905.040 · code text Each resulting lot must have direct access to the public right-of-way, which shall be shown on the tentative and final map. No setback is required for an existing legal structure, or a new one in the same place and size. Applies: Applies to urban lot splits, only as far as needed to comply with state law. § 17.905.040 · code text Only to the extent necessary to avoid a conflict with Government Code Section 66411.7, no setback is required for an existing legally established structure or for a new structure that is constructed in the same location and to the same dimensions as an existing legally established structure. No setback is required for an existing legal structure, or a new one in the same place and size. Applies: Applies to two-unit projects, only as far as needed to comply with state law. § 17.910.040 · code text Only to the extent necessary to comply with Government Code Section 65852.21, no setback is required for an existing legally established structure or for a new structure that is constructed in the same location and to the same dimensions as an existing legally established structure.
Parking	At least 1 off-street parking space per unit. Applies: Applies to each new primary dwelling built on a lot after an urban lot split, subject to state law. § 17.905.040 · code text Subject to Government Code Section 66411.7(e)(3)(A) and (B), each new primary dwelling unit that is built on a lot after the urban lot split must provide at least one off-street parking space per unit. At least 1 off-street parking space per unit. Applies: Applies to each new primary dwelling unit, subject to state law. § 17.910.040 · code text Subject to Government Code Section 65852.21(c)(1)(A) and (B), each new primary dwelling unit must provide at least one off-street parking space per unit.

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Can I split my lot under SB 9 in San Jacinto?

San Jacinto's code: Each unit must be no more than 800 square feet and more than 500 square feet. (Applies to each unit on a lot from an urban lot split, other than an ADU or JADU.) (§ 17.905.040); Each unit must be no more than 800 square feet and more than 500 square feet. (Applies to each unit in an SB 9 two-unit project.) (§ 17.910.040).

Lot splits under SB 9 in San Jacinto

What San Jacinto's code says

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