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Lot splits under SB 9 in Marysville

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

What Marysville's code says

Marysville code What Marysville's code adds
Unit size
  • Floor area limited to a .45 floor area ratio per lot or 800 square feet per unit, whichever is greater.
    Applies: Applies to SB 9 units, not counting ADUs and JADUs.
    § 18.99.050 · code text
    The cumulative Floor Area Ratio of units that are constructed pursuant to Senate Bill 9, excluding Accessory Dwelling Units and Junior Accessory Dwelling Units, shall be limited to .45 per lot or 800 sf per unit, whichever is greater.
Setbacks
  • Encroachments may come no closer than 3 feet to a side property line.
    Applies: Applies to SB 9 units.
    § 18.99.050 · code text
    Encroachments into setback areas are allowed per this title; however, in no case shall an encroachment be closer than three feet from a side property line.
  • Only eaves may extend toward the rear property line, and they must stay 3 feet from it.
    Applies: Applies to SB 9 units.
    § 18.99.050 · code text
    Eaves are the only encroachment allowed into a rear property line and must maintain a setback of three feet in any case.
Standards
  • At most 30 feet tall and no more than 2 stories.
    Applies: Applies to units built under SB 9.
    § 18.99.050 · code text
    Units created pursuant to Senate Bill 9 shall be limited to a maximum height of no greater than 30 feet and no more than two stories.
  • At most 20 feet tall and one story.
    Applies: Applies to SB 9 units within 20 feet of the rearmost property line.
    § 18.99.050 · code text
    A maximum height of no greater than 20 feet and one story shall be applied to units situated within 20 feet of the rearmost property line.
  • Garage doors facing the front or corner-side line may total no more than half the home's width.
    Applies: Applies to SB 9 units.
    § 18.99.050 · code text
    The cumulative linear feet of the vehicular doors to a garage or garages that are oriented to face the front property line or side corner property line shall be no wider than one half of the width of the dwelling structure to which the garage or garages are attached.
  • At least 30 feet of frontage and an average width of 30 feet per lot.
    Applies: Applies to urban lot splits where both lots do not have 55 feet of street frontage.
    § 18.99.020 · code text
    Where 55 feet of frontage on a public right-of-way is not proposed for both lots created by an Urban Lot Split, pursuant to Government Code Section 66411.7, each lot shall have a minimum of 30 feet of frontage on a public right-of-way and an average width of 30 feet, or
  • One lot gets an access corridor 12 to 15 feet wide along its whole length.
    Applies: Applies to urban lot splits where both lots do not have 30 feet of street frontage.
    § 18.99.020 · code text
    one of the lots shall be provided with access by a corridor with at least 12 feet but no more than 15 feet of frontage on a public street.
  • An access easement at least 12 feet and no more than 15 feet wide.
    Applies: Applies to a split lot with no frontage on a public street.
    § 18.99.020 · code text
    Said easement shall be a minimum 12 feet but no more than 15 feet in width for the entire length of the easement.
  • No more than 2 dwelling units per lot.
    Applies: Applies to lots from an urban lot split, counting ADUs and JADUs.
    § 18.99.040 · code text
    Lots created through an Urban Lot Split shall not contain more than two dwelling units, inclusive of Accessory Dwelling Units and Junior Accessory Dwelling Units.
  • 1 attached ADU or 2 detached ADUs per lot.
    Applies: Applies to lots with an SB 9 two-family dwelling built without an urban lot split.
    § 18.99.040 · code text
    Lots that contain a two-family dwelling created pursuant to Senate Bill 9 without an Urban Lot Split, shall be limited to one attached accessory dwelling unit or two detached accessory dwelling units per lots.
  • The applicant must state under penalty of perjury that no tenant lived in the unit in the last 3 years.
    Applies: Applies to SB 9 projects that alter or demolish a dwelling unit.
    § 18.99.060 · code text
    For projects covered by Senate Bill 9, the Applicant shall submit a statement under penalty of perjury that within the last three years there has been no tenant in a dwelling unit that is proposed to be altered or demolished.
  • A deed restriction bars renting the units for 30 days or less.
    Applies: Applies to units on the parcels in an urban lot split or SB 9 project.
    § 18.99.060 · code text
    Prior to approval of a Parcel Map for an Urban Lot Split or Ministerial Approval for a Senate Bill 9 project, the applicant shall record a deed restriction identifying that the units on the parcel or parcels may not be rented for a term of 30 days or less.

Who this affects

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Frequently asked questions

Can I split my lot under SB 9 in Marysville?

Marysville's code: Floor area limited to a .45 floor area ratio per lot or 800 square feet per unit, whichever is greater. (Applies to SB 9 units, not counting ADUs and JADUs.) (§ 18.99.050); Encroachments may come no closer than 3 feet to a side property line. (Applies to SB 9 units.) (§ 18.99.050).

General information, not legal advice.

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