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Lot splits under SB 9 in Rolling Hills

Rolling Hills'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 Rolling Hills Municipal Code it was read from, with the code text one click away (checked October 2026). General information, not legal advice.

What Rolling Hills's code says

Rolling Hills code What Rolling Hills's code adds
Unit size
  • More than 500 and no more than 800 square feet.
    Applies: Applies to each new main home in a two-unit project.
    § 17.45.050 · code text
    The total floor area of each primary dwelling built that is developed under this section must be: (I) Less than or equal to eight hundred [square feet];
  • May not be expanded; limited to its lawful floor area at the time of the two-unit project.
    Applies: An existing legal main home larger than 800 square feet, built before the two-unit project.
    § 17.45.050 · code text
    A primary dwelling that was legally established on the lot prior to the two-unit project and that is larger than eight hundred square feet is limited to the lawful floor area at the time of the two-unit project.
  • May be expanded up to 800 square feet.
    Applies: An existing legal main home smaller than 800 square feet, expanded after or as part of the two-unit project.
    § 17.45.050 · code text
    A primary dwelling that was legally established prior to the two-unit project and that is smaller than eight hundred square feet may be expanded to eight hundred square feet after or as part of the two-unit project.
Standards
  • No more than 2 homes of any kind may be built on the lot.
    Applies: Applies to a lot created by an urban lot split.
    § 17.45.050 · code text
    No more than two dwelling units of any kind may be built on a lot that results from an urban lot split.
  • A two-unit project is allowed, plus any ADU or JADU that state law and the City's ADU rules require.
    Applies: Applies to a lot not created by an urban lot split.
    § 17.45.050 · code text
    A lot that is not created by an urban lot split may have a two-unit project under this section, plus any ADU or JADU that must be allowed under state law and the City's ADU ordinance.
  • New primary dwelling no more than a single story or sixteen feet tall, measured from grade to peak
    Applies: New primary dwelling unit
    § 17.45.050 · code text
    No new primary dwelling unit may exceed a single story or sixteen feet in height, measured from grade to peak of the structure.
  • No rooftop decks are allowed.
    Applies: Applies to any new or remodeled building on a lot from an urban lot split.
    § 17.45.050 · code text
    No rooftop deck is permitted on any new or remodeled dwelling or structure on a lot resulting from an urban lot split.

Who this affects

HomeownersContractorsDesigners

Frequently asked questions

Can I split my lot under SB 9 in Rolling Hills?

Rolling Hills's code: More than 500 and no more than 800 square feet. (Applies to each new main home in a two-unit project.) (§ 17.45.050); May not be expanded; limited to its lawful floor area at the time of the two-unit project. (An existing legal main home larger than 800 square feet, built before the two-unit project.) (§ 17.45.050).

General information, not legal advice.

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