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Brentwood · Building on your lot

Sheds, garages and other accessory structures in Brentwood

Brentwood limits accessory buildings to one story and 15 feet; portable sheds in required yards, to 120 square feet and the adjacent fence height.

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Key points

  • Accessory buildings: Brentwood limits accessory buildings to one story and 15 feet; portable sheds in required yards, to 120 square feet and the adjacent fence height.

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

What Brentwood's code says

Brentwood code What Brentwood's code adds
Maximum height
  • No more than 1 story and 15 feet.
    Applies: Accessory buildings in residential, agricultural or open space zones.
    § 17.660.006 · code text
    The maximum height of accessory buildings shall be one story and fifteen feet.
  • No taller than the adjacent fence, and no more than 7 feet.
    Applies: Portable shed in a required rear and side yard.
    § 17.660.006 · code text
    Within a required rear and side yard a portable shed (as defined in Chapter 17.030) shall be permitted provided its height does not exceed the height of the adjacent fence up to seven feet in height
Size or lot coverage
  • No more than 120 square feet of floor area.
    Applies: Portable shed in a required rear and side yard.
    § 17.660.006 · code text
    Within a required rear and side yard a portable shed (as defined in Chapter 17.030) shall be permitted provided its height does not exceed the height of the adjacent fence up to seven feet in height, its floor area does not exceed one hundred twenty square feet
  • Buildings and structures may cover no more than 50% of the required minimum rear yard.
    Applies: Pools and spas do not count.
    § 17.660.006 · code text
    In no case shall more than fifty percent of a required minimum rear yard be covered by any buildings or structures, excluding pools and spas.
Side and rear setback
  • At least 4 feet from any side or rear property line, measured from the closest point, such as an eave.
    § 17.660.006 · code text
    Accessory buildings shall be set back four feet from any side or rear property line, as measured from the closest point (e.g., roof overhang or eave if applicable).
Distance from the house
  • At least 4 feet from any other building on the lot.
    Applies: Enclosed accessory buildings.
    § 17.660.006 · code text
    Enclosed accessory buildings (as defined in Chapter 17.030) shall not be closer than four feet from any other building on the lot.

Who this affects

HomeownersContractorsDesigners

Frequently asked questions

How big can a shed or accessory building be in Brentwood?

Brentwood limits accessory buildings to one story and 15 feet; portable sheds in required yards, to 120 square feet and the adjacent fence height.

General information, not legal advice.

Ask about a specific Brentwood property

Ask GoCodebook how Brentwood's sheds, garages and other accessory structures rules apply to your situation and get an answer that cites the section.

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Brentwood Municipal Code — full text