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Monte Sereno · Building on your lot

Lot splits under SB 9 in Monte Sereno

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

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

What Monte Sereno's code says

Monte Sereno code What Monte Sereno's code adds
How the lot may be divided
  • Each new parcel must have at least 40% of the original lot area.
    Applies: Urban lot split.
    § 13.06.020 · code text
    Has at least forty percent (40%) of the lot area of the original parcel,
Minimum new lot size
  • Each new parcel must be at least 1,200 square feet.
    Applies: Each newly created parcel.
    § 13.06.020 · code text
    Has at least one thousand two hundred (1,200) square feet in size,
Setbacks
  • No setback required.
    Applies: An existing structure, or one rebuilt in the same place with the same dimensions.
    § 13.06.020 · code text
    No setback shall be required for an existing structure or a structure constructed in the same location and to the same dimensions as an existing structure,
  • At least 4 feet from side and rear lot lines.
    Applies: New structures on an urban lot split; waived if it would block 2 units or force units under 800 square feet.
    § 13.06.020 · code text
    and in all other circumstances a setback of four (4) feet from the side and rear lot lines shall be provided,
Standards
  • No more than 2 new parcels.
    Applies: Proposed urban lot split.
    § 13.06.020 · code text
    The proposed urban lot split will create no more than two (2) new parcels,
  • At least 10% of the original parcel's street frontage.
    Applies: Each new parcel, unless this would block 2 units or force a unit under 800 square feet.
    § 13.06.020 · code text
    Has at least ten percent (10%) of the lot frontage of the original parcel, unless the applicant can demonstrate that this would have the effect of the effect of physically precluding the construction of two (2) units on either of the resulting parcels or would necessarily result in a unit size of less than eight hundred (800) square feet,
  • Lot lines must be at right angles to streets, or radial on curved streets.
    Applies: New parcels.
    § 13.06.020 · code text
    New parcels shall maintain right angles to streets or radial to the centerline of curved streets.
  • Only parcels in a single-family residential zone may be split.
    Applies: Urban lot split.
    § 13.06.020 · code text
    The parcel to be subdivided is located within a single-family residential zone.
  • No more than 2 dwelling units.
    Applies: Any parcel created by an urban lot split.
    § 13.06.040 · code text
    no more than two (2) dwelling units shall be permitted on any parcel created under the provisions of this Chapter.
Owner occupancy
  • The owner must live in one unit as a principal residence for at least 3 years.
    Applies: Counted from the date the urban lot split is approved.
    § 13.06.020 · code text
    The owner of the parcel intends to occupy one (1) of the housing units as their principal residence for a minimum of three (3) years from the date of the approval of the urban lot split.
  • Not required.
    Applies: The owner is a community land trust or qualified nonprofit corporation.
    § 13.06.020 · code text
    Owner-occupancy is not required if the owner is a community land trust or qualified nonprofit corporation under Sections 214.15 or 402.1 of the Revenue and Taxation Code.
Parking
  • At least 1 off-street parking space per parcel.
    Applies: Not required within a half-mile walk of a high-quality transit corridor or major transit stop, or 1 block of car share.
    § 13.06.020 · code text
    A minimum of one (1) off-street parking space shall be provided on each parcel except where the parcel meets one (1) of the following instances:

Who this affects

HomeownersContractorsDesigners

Frequently asked questions

Can I split my lot under SB 9 in Monte Sereno?

Monte Sereno's code: Each new parcel must be at least 1,200 square feet. (Each newly created parcel.) (§ 13.06.020); The owner must live in one unit as a principal residence for at least 3 years. (Counted from the date the urban lot split is approved.) (§ 13.06.020).

General information, not legal advice.

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