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Brea · Building on your lot

Lot splits under SB 9 in Brea

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

What Brea's code says

Brea code What Brea's code adds
How the lot may be divided
  • Each new lot must be at least 40% of the existing lot.
    Applies: Single-family residential zones.
    § 20.56.050 · code text
    The size of the new lot shall be at least 40% of the existing lot prior to the Urban Lot Split.
Unit size
  • At most 800 square feet.
    Applies: New units in a two-unit development; no maximum for a unit converted from existing space in the same location and dimensions.
    § 20.56.040 · code text
    Maximum Unit Size | 800 square feet
Minimum new lot size
  • Each new lot must be at least 1,200 square feet.
    Applies: New lots created through an urban lot split.
    § 20.56.050 · code text
    In no instance shall the new lots be less than 1,200 sq. ft.
Setbacks
  • At least 4 feet.
    Applies: Side setback for a two-unit development.
    § 20.56.040 · code text
    Side - 4 feet
  • At least 4 feet.
    Applies: Rear setback for a two-unit development.
    § 20.56.040 · code text
    Rear - 4 feet
  • No setbacks required.
    Applies: A legally permitted existing structure on a lot created through an urban lot split.
    § 20.56.050 · code text
    No setbacks are required for a legally permitted existing structure.
Standards
  • Every lot must front directly on a public or private street; alleys do not count.
    Applies: Lots created through an urban lot split.
    § 20.56.050 · code text
    All lots shall have frontage directly onto a public or private street, excluding alleys.
  • Each lot must be at least 24 feet wide along a street.
    Applies: Lots created through an urban lot split.
    § 20.56.050 · code text
    All lots shall have a minimum lot width of 24 feet abutting a street.
  • Height is limited to 16 feet.
    Applies: Detached or newly built units in a two-unit development.
    § 20.56.040 · code text
    Detached or new construction: The maximum height is 16 feet.
  • At least 10 feet between buildings.
    Applies: Detached units in an SB 9 two-unit development.
    § 20.56.040 · code text
    Detached: 10 feet
  • Each unit must have its own entrance from the outside.
    Applies: Each dwelling unit in a two-unit development.
    § 20.56.040 · code text
    Must have independent entrance from the exterior.
  • Separate utility connections and separate utility meters are required.
    Applies: Two-unit developments and urban lot splits.
    § 20.56.040 · code text
    Two-unit developments shall have separate utility connections and separate utility meters.
  • Units may not be rented for less than 30 consecutive days at a time.
    Applies: Two-unit developments and urban lot split properties.
    § 20.56.040 · code text
    Dwelling units shall not be rented for less than 30 consecutive days at a time.
Owner occupancy
  • Owner must live in one unit as a principal residence for at least 3 years from lot split approval.
    Applies: Urban lot split property; the owner signs an affidavit.
    § 20.56.050 · code text
    The legal owner of an urban lot split property shall sign an affidavit stating that the owner intends to occupy one of the housing units as their principal residence for a minimum of three years from the date of approval of the urban lot split.
  • The owners must live in one of the units as their primary residence and legal home.
    Applies: Two-unit development on a lot that is not split.
    § 20.56.040 · code text
    If the lot does not undergo an urban lot split, expressly requires the individual property owners to live in one (1) of the dwelling units on the lot as the owners' primary residence and legal domicile.

Who this affects

HomeownersContractorsDesigners

Frequently asked questions

Can I split my lot under SB 9 in Brea?

Brea's code: Each new lot must be at least 1,200 square feet. (New lots created through an urban lot split.) (§ 20.56.050); Owner must live in one unit as a principal residence for at least 3 years from lot split approval. (Urban lot split property; the owner signs an affidavit.) (§ 20.56.050).

General information, not legal advice.

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