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Siskiyou County · Building on your lot

Sheds, garages and other accessory structures in Siskiyou County

Accessory structures are limited to 20 feet in Res districts and on R-R lots under 1 acre; 30 feet on larger R-R lots. Accessory structures need 5-foot side yards, except on the rear half of Res lots, where the setback from interior lines is 1 foot.

Key points

  • Accessory height: Accessory structures are limited to 20 feet in Res districts and on R-R lots under 1 acre; 30 feet on larger R-R lots.
  • Accessory setbacks: Accessory structures need 5-foot side yards, except on the rear half of Res lots, where the setback from interior lines is 1 foot.

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

What Siskiyou County's code says

Siskiyou County code What Siskiyou County's code adds
Maximum height
  • At most 20 feet.
    Applies: R-R District, lots under 1 acre.
    § 10-6.5501 · code text
    | R-R | 7,200 sq. ft. 1 | 1 acre | 35 ft. 11 | 20 ft. 11 | 40% | 60 1 | 20 2, 9, 10 | 5 | 20 4, 12 |
  • At most 30 feet.
    Applies: Accessory structures in the R-R District on lots of 1 acre or more.
    § 10-6.5501 · code text
    On one-acre or larger lots, the maximum height standard shall be forty (40') feet for single-family dwellings and thirty (30') feet for accessory structures.
  • At most 20 feet.
    Applies: Res-1 District.
    § 10-6.5501 · code text
    | Res-1 | 7,200 sq. ft. 1 | 1 acre | 30 ft. | 20 ft. | 40% | 60 1 | 20 2 | 5 3 | 20 4, 12 |
  • At most 20 feet.
    Applies: Res-2 District.
    § 10-6.5501 · code text
    | Res-2 | 7,200 sq. ft. 1 | N/A | 35 ft. | 20 ft. | 50% | 60 1 | 20 2 | 5 3 | 20 4, 12 |
  • At most 20 feet on average.
    Applies: Res-3 District.
    § 10-6.5501 · code text
    | Res-3 | 7,200 sq. ft. 5 | N/A | 40 ft. | 20 ft. avg. | 75% | 50 5 | 20 | 5 3 | 10 6, 12 |
  • At most 20 feet on average.
    Applies: Res-4 District.
    § 10-6.5501 · code text
    | Res-4 | 7,200 sq. ft. 5 | N/A | 40 ft. | 20 ft. avg. | 75% | 50 5 | 20 | 5 3 | 10 6, 12 |
Side and rear setback
  • 5 feet.
    Applies: Side yards in the R-R District.
    § 10-6.5501 · code text
    | R-R | 7,200 sq. ft. 1 | 1 acre | 35 ft. 11 | 20 ft. 11 | 40% | 60 1 | 20 2, 9, 10 | 5 | 20 4, 12 |
  • 1 foot.
    Applies: Rear yards for accessory structures in the R-R, Res-1 and Res-2 Districts.
    § 10-6.5501 · code text
    For accessory structures the minimum rear yard shall be one foot.
  • 5 feet.
    Applies: Res-1 side yards, except accessory structures on the rear half; some narrow pre-December 3, 1957 lots may use 10% of width, at least 3 feet.
    § 10-6.5501 · code text
    | Res-1 | 7,200 sq. ft. 1 | 1 acre | 30 ft. | 20 ft. | 40% | 60 1 | 20 2 | 5 3 | 20 4, 12 |
  • 5 feet.
    Applies: Res-2 side yards, except accessory structures on the rear half; some narrow pre-December 3, 1957 lots may use 10% of width, at least 3 feet.
    § 10-6.5501 · code text
    | Res-2 | 7,200 sq. ft. 1 | N/A | 35 ft. | 20 ft. | 50% | 60 1 | 20 2 | 5 3 | 20 4, 12 |
  • 5 feet.
    Applies: Res-3 side yards, except accessory structures on the rear half; some narrow pre-December 3, 1957 lots may use 10% of width, at least 3 feet.
    § 10-6.5501 · code text
    | Res-3 | 7,200 sq. ft. 5 | N/A | 40 ft. | 20 ft. avg. | 75% | 50 5 | 20 | 5 3 | 10 6, 12 |
  • 10 feet.
    Applies: Rear yards in the Res-3 District.
    § 10-6.5501 · code text
    | Res-3 | 7,200 sq. ft. 5 | N/A | 40 ft. | 20 ft. avg. | 75% | 50 5 | 20 | 5 3 | 10 6, 12 |
  • 5 feet.
    Applies: Res-4 side yards, except accessory structures on the rear half; some narrow pre-December 3, 1957 lots may use 10% of width, at least 3 feet.
    § 10-6.5501 · code text
    | Res-4 | 7,200 sq. ft. 5 | N/A | 40 ft. | 20 ft. avg. | 75% | 50 5 | 20 | 5 3 | 10 6, 12 |
  • 10 feet.
    Applies: Rear yards in the Res-4 District.
    § 10-6.5501 · code text
    | Res-4 | 7,200 sq. ft. 5 | N/A | 40 ft. | 20 ft. avg. | 75% | 50 5 | 20 | 5 3 | 10 6, 12 |
  • At least 1 foot from interior lot lines.
    Applies: Res-1 to Res-4 accessory structures on the rear half; on corner lots, not past the front yard of the adjacent lot.
    § 10-6.5501 · code text
    The minimum required side yard for accessory structures shall be one foot from the interior lot lines when constructed on the rear one-half (½) of the lot or, in the case of a corner lot, shall not project beyond the front yard required or existing on an adjacent lot.

Also in Siskiyou County's code: Accessory buildings on sites less than one acre (§ 10-6.1512). This page does not summarize it yet.

Who this affects

HomeownersContractorsDesigners

Frequently asked questions

How big can a shed or accessory building be in Siskiyou County?

Accessory structures are limited to 20 feet in Res districts and on R-R lots under 1 acre; 30 feet on larger R-R lots. Accessory structures need 5-foot side yards, except on the rear half of Res lots, where the setback from interior lines is 1 foot.

General information, not legal advice.

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