Calabasas · Building on your lot

Lot splits under SB 9 in Calabasas

Calabasas's own rules on lot splits under SB 9, with the code text for every value.

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

What Calabasas's code says

Calabasas code What Calabasas's code adds
How the lot may be divided	The smaller new lot must be at least 40% of the original lot's area. Applies: Applies to urban lot splits, where both new lots must be about equal in area. § 17.82.050 · code text The smaller parcel shall not be smaller than forty (40) percent of the lot area of the original parcel.
Unit size	Each unit can be at most 800 square feet. Applies: Applies to any unit built under the urban lot split chapter. § 17.82.050 · code text The maximum unit size for any unit developed under this chapter is eight hundred (800) square feet in size.
Minimum new lot size	Each new lot must be at least 1,200 square feet. Applies: Applies to both new lots. § 17.82.050 · code text Both newly created parcels shall be at least one thousand two hundred (1,200) square feet.
Standards	At most 4 units per original lot: at most 2 new lots, at most 2 units each. No added ADUs/JADUs. § 17.82.050 · code text Each original parcel subdivided under this chapter may be developed with a total maximum of four residential units, calculated as a maximum of two newly created parcels and a maximum of two residential units per each of those two newly created parcels. No additional accessory dwelling units or junior dwelling units are permitted. A new lot cannot be narrower on average than the original lot. Applies: Unless this would prevent building 2 units on either new lot, or would make a unit smaller than 800 square feet. § 17.82.050 · code text The subdivision shall not result in a new parcel with an average width that is less than the average width of the original parcel, unless this requirement would have the effect of physically precluding the construction of two units on either of the resulting parcels or that would result in a unit size of less than eight hundred (800) square feet. All lot lines must follow existing zoning boundaries. § 17.82.050 · code text All lot lines shall be contiguous to existing zoning boundaries. Each new lot must have access to, give access to, or border an improved public street. § 17.82.050 · code text All parcels created pursuant to this chapter shall have access to, provide access to, or adjoin the improved public right-of-way. A 1-hour fire wall is required between the units. Applies: Applies when 2 units share a common wall. § 17.82.050 · code text Where two residential units are configured as sharing a common wall, a one-hour fire wall between the units is required. New or changed detached units must be at least 10 feet from any other unit or building. Applies: Applies to urban lot split units. § 17.82.050 · code text All new or modified detached residential units shall be separated from any other residential unit or building by at least ten (10) feet to prevent the spread of fire. An automatic fire sprinkler system is required. Applies: Applies to all new homes. § 17.82.050 · code text All new residential units are required to have an automatic fire sprinkler system. Fire-resistant building materials are required. Applies: Applies to all new homes. § 17.82.050 · code text All new residential units are required to use fire-resistant building materials. Urban lot splits are allowed only in the RS, RR and RC single-family zones. Applies: Only lots in single-family residential zones qualify. § 17.82.020 · code text only parcels located within single-family residential zones are eligible for urban lot splits, that is parcels located in the following zones:

Who this affects

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Frequently asked questions

Can I split my lot under SB 9 in Calabasas?

Calabasas's code: Each new lot must be at least 1,200 square feet. (Applies to both new lots.) (§ 17.82.050); Each unit can be at most 800 square feet. (Applies to any unit built under the urban lot split chapter.) (§ 17.82.050).

General information, not legal advice.

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Calabasas Municipal Code — full text