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Diamond Bar · Building on your lot

Sheds, garages and other accessory structures in Diamond Bar

Diamond Bar limits detached accessory structures in residential zones to 15 feet and one story, and no higher than the main home.

Key points

  • Accessory structures: Diamond Bar limits detached accessory structures in residential zones to 15 feet and one story, and no higher than the main home.

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

What Diamond Bar's code says

Diamond Bar code What Diamond Bar's code adds
Maximum height
  • At most 1 story or 15 feet tall, and no taller than the main home.
    Applies: Detached accessory structures in a residential zone.
    § 22.42.110 · code text
    A detached accessory structure shall not exceed one story or 15 feet in height; and shall not exceed the height of the main residential structure.
Size or lot coverage
  • At most 30% of the required rear yard.
    Applies: Floor area of a single detached accessory structure; covered patios and barbecue areas do not count.
    § 22.42.110 · code text
    The floor area of a single detached accessory structure shall not exceed 30 percent, nor shall the sum of the floor area(s) of the total number of detached accessory structures exceed 40 percent, of the required rear yard of the parcel.
  • At most 40% of the required rear yard.
    Applies: Total floor area of all detached accessory structures on the parcel.
    § 22.42.110 · code text
    The floor area of a single detached accessory structure shall not exceed 30 percent, nor shall the sum of the floor area(s) of the total number of detached accessory structures exceed 40 percent, of the required rear yard of the parcel.
  • At most 1,000 square feet for each home.
    Applies: Detached accessory garages, including any workshop or storage inside, unless a larger area is approved through development review.
    § 22.42.110 · code text
    A detached accessory garage shall not occupy more than 1,000 square feet for each dwelling unit (including any workshop or storage space within the garage) unless a larger area is authorized by the director through development review, in compliance with chapter 22.48 (Development Review).
  • Up to 500 square feet per home or 10% of the parcel, whichever is less.
    Applies: Accessory greenhouses.
    § 22.42.110 · code text
    An accessory greenhouse may occupy up to 500 square feet for each dwelling unit or ten percent of the parcel, whichever is less.
  • At most 25% of the main building's floor area.
    Applies: Workshops not combined with a garage.
    § 22.42.110 · code text
    A workshop shall not occupy an area larger than 25 percent of the floor area of the main structure, except where a workshop is combined with a garage.
Side and rear setback
  • At least 3 feet from any side lot line.
    Also at least 5 feet from the side line of the front half of any neighboring parcel; the setback table may require more.
    § 22.42.110 · code text
    Accessory structures shall not be closer than three feet to any side lot line, nor within five feet of the side line of the front half of any adjoining parcel.
  • At least 5 feet from the property line or buildable pad line.
    Applies: Single-family homes: detached patio covers, gazebos, greenhouses or storage sheds under 220 square feet; sides and rear.
    § 22.42.110 · code text
    If less than 220 square feet, 5 feet from property line or buildable pad line.
  • Same setbacks as the main building.
    Applies: Detached patio covers, gazebos, greenhouses or storage sheds of 220 square feet or more; sides and rear.
    § 22.42.110 · code text
    If 220 square feet or larger, setbacks shall be the same as required for main structure
  • At least 5 feet from side and rear lines.
    Applies: Swimming pools, spas, fish ponds or outdoor play equipment at a single-family detached home.
    § 22.42.110 · code text
    Swimming pool, spa, fish pond, outdoor play equipment 3 ,4 | Sides, rear Street side | 5 feet As required for main structure
  • At least 3 feet from side and rear lines.
    Applies: Built-in barbecues, fire pits or propane tanks at a single-family detached home.
    § 22.42.110 · code text
    Stationary barbecue, fire pit, propane tank | Sides, rear 3 Street side | 3 feet As required for main structure
  • At least 42 inches from side and rear lines.
    Applies: Air-conditioning equipment or pool and spa equipment at a single-family detached home.
    § 22.42.110 · code text
    Air-conditioning equipment, pool and spa equipment | Sides, rear 3 Street side | 42 inches As required for main structure
  • At least 10 feet from side and rear lines.
    Applies: Tennis courts at a single-family detached home.
    § 22.42.110 · code text
    Tennis court | Sides, rear 3 Street side Front | 10 feet As required for main structure As required for main structure
  • At least 5 feet from side and rear lines.
    Applies: Multifamily properties: pools, spas, fish ponds, play equipment, fountains or decorative pools; front and street side need 10 feet.
    § 22.42.110 · code text
    Swimming pool, spa, the fish pond, outdoor play equipment, fountains, decorative pools | Front Sides Street side Rear 3 | 10 feet 5 feet 10 feet 5 feet

Who this affects

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Frequently asked questions

How big can a shed or accessory building be in Diamond Bar?

Diamond Bar limits detached accessory structures in residential zones to 15 feet and one story, and no higher than the main home.

General information, not legal advice.

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