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Lot splits under SB 9 in Del Mar

Del Mar's own rules on lot splits under sb 9, with the code text for every value, and the state law underneath.

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

What Del Mar's code says

Del Mar code What Del Mar's code adds
How the lot may be divided
  • The 2 new lots must be about equal; neither may be smaller than 40% of the original lot area.
    Applies: Applies to urban lot splits in single dwelling unit zones (R1-40, R1-14, R1-10, R1-5).
    § 24.66.050 · code text
    The two parcels created shall be approximately equal in size, provided that one lot shall not be any smaller than 40 percent of the lot area of the original lot.
Unit size
  • New units may be no larger than 800 square feet.
    Applies: Applies to new units on lots created by an urban lot split.
    § 24.66.050 · code text
    New unit sizes shall not be greater than 800 square feet.
  • Up to 800 square feet; 801-1,000 square feet if the unit meets base-zone setbacks and a 6-foot building separation.
    Applies: Applies to units built under the two-unit residential development rules in single dwelling unit zones.
    § 30.93.050 · code text
    Individual dwelling units developed in accordance with this Chapter shall not exceed a range of 800—1,000 square feet, as further defined in Section 30.93.050(A)(6)(b) of this Chapter.
Minimum new lot size
  • Each of the 2 new lots must be at least 1,200 square feet.
    § 24.66.050 · code text
    The two lots shall be no smaller than 1,200 square feet in lot area for each lot.
Setbacks
  • The unit must be at least 4 feet from interior side and rear property lines.
    Applies: Applies to a new primary dwelling unit of no more than 800 square feet of gross floor area.
    § 30.93.050 · code text
    A primary dwelling unit with a maximum gross floor area of 800 square feet shall not be permitted closer than four feet from interior side and rear property lines.
  • The unit must meet the base-zone setbacks and be at least 6 feet from other buildings.
    Applies: Applies to new primary units of 801-1,000 square feet under the two-unit residential development rules.
    § 30.93.050 · code text
    New primary dwelling unit structures that comply with the setbacks of the base zone and minimum six-foot building separation shall be allowed 801-1,000 square feet of building area.
Standards
  • At most 2 dwelling units on each lot; lots with existing ADUs or JADUs cannot add more ADUs or JADUs.
    Applies: Applies to urban lot splits.
    § 24.66.050 · code text
    Urban Lot Splits shall be limited to a maximum of two dwelling units on each lot. Lots subdivided under an Urban Lot Split are not eligible for additional Accessory Dwelling Units or Junior Accessory Dwelling Units if the lot contains existing Accessory Dwelling Units or Junior Accessory Dwellings.
Owner occupancy
  • The owner must live in one of the units as their primary residence for at least 3 years.
    Applies: The record owner must live in a unit on either new lot. A community land trust or qualified nonprofit corporation is exempt.
    § 24.66.050 · code text
    The record owner shall reside in one of the dwelling units on either of the lots created by the Urban Lot Split as their primary residence for a minimum of three years from the date of approval of the Urban Lot Split.
Parking
  • 1 parking space is required for each unit.
    Applies: Each unit under the two-unit rules; not required within 1/2 mile walk of high-quality transit or a major transit stop, or 1 block of car-share.
    § 30.93.050 · code text
    One parking space is required for each unit created pursuant to this Chapter, unless the parcel upon which the unit is within one-half mile walking distance of a high-quality transit-corridor, as defined in Public Resources Code Section 21155, or a major transit stop, as defined in Public Resources Code Section 21064.3, or there is a car share vehicle located within one block of the project.

Who this affects

HomeownersContractorsDesigners

Frequently asked questions

Can I split my lot under SB 9 in Del Mar?

Del Mar's code: The 2 new lots must be about equal; neither may be smaller than 40% of the original lot area. (Applies to urban lot splits in single dwelling unit zones (R1-40, R1-14, R1-10, R1-5).) (§ 24.66.050); New units may be no larger than 800 square feet. (Applies to new units on lots created by an urban lot split.) (§ 24.66.050).

General information, not legal advice.

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