Bolthole Index

Siskiyou County, California

Zoning, building permits and septic rules in Fort Jones, California

Fort Jones, California sets its own zoning and requires a building permit to place a manufactured home inside town limits1. R-1 single-family lots start at 6,000 square feet2. Septic permits come from Siskiyou County Environmental Health, not the town3. We could not confirm town rules on owner-builders, tiny homes or fees, so Town Hall is the first call.

At a glance

Building permit
Required to place a manufactured home; other work: ask Town Hall1
Zoning
Town zoning with R-1 and R-3 residential districts24
Minimum lot (R-1)
6,000 sq ft interior, 7,200 sq ft corner2
Septic
Siskiyou County Environmental Health3
Sewer and water
Manufactured homes must connect to town sewer and water5
RV living
RV park spaces only: 90 days per 12 months with full hook-ups6
Accessory dwelling units
Allowed; existing-space ADUs are approved ministerially7
Owner-builder
Not confirmed by the town; state law exempts owners from contractor licensing only8

Who to call

Planning & zoning

Town of Fort Jones Town Hall

Town zoning, use permit forms and the first call for building permit questions inside Fort Jones

(530) 468-2281

11960 East Street, Fort Jones, California 96032

Online permits →

Building permits

Siskiyou County Building Division

County building permits for unincorporated land; routes applications to Fort Jones for the town's review

530-841-2100

[email protected]

806 South Main Street, Yreka, CA 96097

Online permits →

Septic permits

Siskiyou County Environmental Health Division

Septic systems and water wells for Siskiyou County, including Fort Jones addresses that are not on town sewer

530-842-8200

[email protected]

806 South Main Street, Yreka, CA 96097

Online permits →

Contact details are copied from each office’s official page and were checked against it on October 16, 2026.

Off-grid gear

Going off-grid in Fort Jones means bringing your own water and power. The kit we’d start with:

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Does Fort Jones have zoning, and what does it mean for lot size and setbacks?

Fort Jones zones residential land into districts, and the numbers change by district. In the R-1 district, a single-family lot needs at least 6,000 square feet for an interior lot and 7,200 square feet for a corner lot2. R-1 caps lot coverage at 40 percent9 and building height at 35 feet10. In the R-3 district, single-family or duplex lots need 6,000 square feet4, with coverage up to 60 percent11 and the same 35-foot height limit12.

Manufactured homes are allowed on individual lots in residential zones, as residential use only, on a permanent foundation13. We could not confirm whether the town sets a minimum dwelling size, so ask Town Hall.

Do you need a building permit in Fort Jones, and who issues it?

Fort Jones requires a building permit to place a manufactured home inside town limits1. The Town Code ties that permit to the building codes plus foundation, snow-load, wind-load, manufacturer-instruction and sewer and water conditions1. Existing-space accessory dwelling units are also approved ministerially with a building permit7.

For other construction, Siskiyou County Building Division says it routes applications to the partner town of Fort Jones for review14, and the county states that in Fort Jones the same reviews are done by the town15. We could not confirm which office issues and inspects permits for a new site-built house, or what the town charges, so ask Town Hall at (530) 468-2281 before you draw plans16.

How do septic permits work inside Fort Jones?

Septic permits for Siskiyou County come from the county's Environmental Health Division, which reviews, permits and inspects individual sewage disposal systems, wells and water systems3. A septic permit is required to install, repair or alter an individual sewage disposal system17, and a final inspection is required at completion18. Environmental Health is at 530-842-820019.

Inside town limits, the Town Code requires manufactured homes used as residences to connect to town sewer and water at the owner's expense5. For a lot where town sewer is not available, or any other home, we could not confirm whether a septic system is allowed; ask Town Hall and Environmental Health together before you buy.

Can you live in an RV or tiny home in Fort Jones?

Fort Jones regulates RV stays in its manufactured-home and RV park: a space with total hook-up capacity (sewer, water and electricity) allows no more than 90 days in any 12-month period, and a space with less than full hook-ups allows no more than 21 days6. The park manager must keep an occupancy log, and the town council may issue a special occupancy permit for longer stays6.

We could not confirm whether Fort Jones allows living in an RV on an ordinary residential lot. California's general rule is that RVs are not intended as permanent dwellings and generally may be occupied only in mobilehome or special occupancy parks unless a local ordinance allows otherwise20. No town provision for tiny homes as a separate category turned up. State guidance says a tiny home can be occupied only if it is approved as a manufactured home, a code-compliant house, factory-built housing, an RV, a park trailer or a camping cabin21.

Can you add an accessory dwelling unit in Fort Jones?

Fort Jones allows ADUs and junior ADUs7. An ADU built inside existing space, such as a garage or the main house, is approved ministerially with a building permit when it meets building and safety codes and has independent exterior access7. A new detached ADU is limited to 1,200 square feet and a junior ADU to 500 square feet7. Existing-space ADUs may be rented for a term of up to one year, renewable without limit7. California ADU law requires the permitting agency to tell you within 15 business days whether your application is complete22.

Building a home in Fort Jones: the steps, in order

  1. Call Fort Jones Town Hall at (530) 468-2281 to confirm your parcel's zoning district and which office issues building permits16.
  2. Check lot size and coverage against your district: 6,000 square feet minimum in R-1 or R-324.
  3. Ask Siskiyou County Environmental Health about sewer, septic and wells3.
  4. Apply for the building permit; a manufactured home needs one before placement1.
  5. Connect to town sewer and water if you are placing a manufactured home5.
  6. If you act as your own builder, remember that California's owner-builder rule covers contractor licensing only and does not by itself waive building permits8.

What stays with Siskiyou County, and what to check before you buy

Septic and well permits stay with Siskiyou County Environmental Health323. Land outside town limits follows the county's rules instead of the town's; see the Siskiyou County page for unincorporated land.

County-level numbers help with the budget: Siskiyou County's effective property tax rate is about 0.7 percent24, and the median property tax bill is about $1,880 a year25. Fort Jones permits and fees are separate, and we could not find a town fee schedule for building permits.

Watch-outs

  • We could not confirm whether the Town of Fort Jones or Siskiyou County issues and inspects building permits for new site-built houses, so confirm with Town Hall before you buy14.
  • County rules on RVs, camping and building permits apply to unincorporated Siskiyou County, not to land inside Fort Jones15.
  • Siskiyou County requires a Floodplain Development Permit for development in a Special Flood Hazard Area on land it administers; ask Town Hall whether the same step applies inside Fort Jones26.
  • Town rules on owner-builders, tiny homes, short-term rentals, driveways and permit fees were not confirmed; ask Town Hall at (530) 468-228116.

Sources

  1. Sec. 18.20.160. Manufactured homes; building permits (Fort Jones), quoted and re-checked
  2. Sec. 18.16.010. R-1 district (Fort Jones), quoted and re-checked
  3. Land Use, quoted and re-checked
  4. Sec. 18.16.030. R-3 district (Fort Jones), quoted and re-checked
  5. Sec. 18.20.160. Manufactured homes; building permits (Fort Jones), quoted and re-checked
  6. Sec. 17.16.060. Length of occupancy (Fort Jones), quoted and re-checked
  7. Sec. 18.60.030. Accessory dwelling units within existing space (Fort Jones), quoted and re-checked
  8. California Business and Professions Code Section 7044 (California statewide rule), quoted and re-checked
  9. library.municode.com (Fort Jones), quoted and re-checked
  10. library.municode.com (Fort Jones), quoted and re-checked
  11. library.municode.com (Fort Jones), quoted and re-checked
  12. library.municode.com (Fort Jones), quoted and re-checked
  13. Sec. 18.20.150. Manufactured homes/mobile homes; residential use requirements (Fort Jones), quoted and re-checked
  14. Siskiyou County Building Division (siskiyoucounty.gov)
  15. Permit Application Process, quoted and re-checked
  16. Town of Fort Jones Town Hall (fortjonesca.org)
  17. Individual Sewage Disposal Systems Site Review and Permit Procedure, quoted and re-checked
  18. Individual Sewage Disposal Systems Site Review and Permit Procedure, quoted and re-checked
  19. Siskiyou County Environmental Health Division (siskiyoucounty.gov)
  20. hcd.ca.gov (California statewide rule), quoted and re-checked
  21. Information Bulletin 2016-01: Tiny Homes (California statewide rule), quoted and re-checked
  22. Accessory Dwelling Unit Handbook March 2026 (California statewide rule), quoted and re-checked
  23. Water Wells, quoted and re-checked
  24. Effective property tax rate: Bolthole Index county data
  25. Median property tax bill: Bolthole Index county data
  26. Floodplain Management, quoted and re-checked

Written October 16, 2026 from the rules quoted below, each taken from an official source and re-checked by an independent reviewer. This is research, not legal advice: rules change, so confirm with the office before you buy or build.

Answers from the rulebook for Fort Jones

Fort Jones’s own rules

  • Building permitRequired

    Placement of a manufactured home inside Fort Jones city limits.

    • The permit issuance requires compliance with town building codes and ordinances; foundation, snow-load, wind-load, manufacturer-instruction, and sewer/water conditions also apply.
    “A building permit shall be obtained for the placement of a manufactured home/manufactured home.”
  • Living in an RVLimited

    Recreational-vehicle spaces in a Fort Jones manufactured-home or recreational-vehicle park.

    • Total hook-up capacity: no more than 90 days in any 12-month period.
    • Less than total hook-up capacity: no more than 21 days in any 12-month period.
    • Park manager must maintain an occupancy log.
    • Town council may issue a special occupancy permit for more than 21 days, valid for 30 days post-issuance, with renewal allowed.

    total hook-up occupancy limit: 90 days per 12 months (special occupancy permit may apply) · less-than-total-hook-up occupancy limit: 21 days per 12 months (special occupancy permit may apply)

    “persons occupying vehicles with total hook-up capacity, including sewer, water and electricity, shall not occupy any space in a recreational vehicle for a period exceeding 90 days in any 12-month period”
  • Manufactured homesAllowed (with conditions)

    Manufactured homes on individual lots in residential zones inside Fort Jones city limits.

    • Residential use only; subject to provisions applying to residential structures; permanent foundation; conventional exterior and roof materials; applicable plot-plan, building-permit, code, foundation, snow-load, wind-load, and utility requirements.
    “Manufactured homes, as defined by section 18.08.010 , are allowed to be placed in a residential zone on individual lots, consistent with Government Code § 65852.3”
  • Accessory dwellingsAllowed (with conditions)

    ADUs and JADUs inside Fort Jones city limits.

    • Existing-space ADUs are ministerial with a building permit if building and safety codes, independent exterior access, and sufficient side/rear fire-safety setbacks are met.
    • New detached ADUs are subject to the underlying zoning conditions, maximum four-foot side/rear setbacks where specified, parking limits, and unit-size limits.
    • An existing-space ADU may be rented for a term not exceeding one year, renewable without limit.

    new detached ADU maximum floor space: <= 1200 sq ft (subject to Sec. 18.60.040) · JADU maximum size: <= 500 sq ft (existing-space provision)

    “an adu within an existing space including the primary structure, attached or detached garage or other accessory structure shall be permitted ministerially with a building permit regardless of all other standards within the chapter”
  • Mandatory utility hookupWater and sewer (with conditions)

    Manufactured homes installed for residential use inside Fort Jones city limits.

    • Connection is at the owner's expense.
    “All manufactured homes/manufactured homes installed for the purpose of residential use shall be connected to town sewer and water facilities at owner's expense.”
  • Subdividing landRegulated (with conditions)

    Division of land into two or more lots or parcels for sale inside Fort Jones city limits.

    • The municipal subdivision title defines subdivision and contains subdivision regulations; hillside and lot-type standards may apply.
    “Subdivision means any land, or portion thereof, shown on the last preceding tax roll as a unit or as a contiguous unit which is divided into two or more lots or parcels for the purpose of sale”

Rules another office applies inside Fort Jones

Fort Jones does not set these itself; the county, a health district or the state does, and they apply to every address inside its limits.

  • Minimum lot sizeSpecified

    Single-family dwellings in the R-1 district inside Fort Jones city limits.

    • R-1 table distinguishes corner and interior minimum building sites.

    corner minimum building site: 7200 sq ft (R-1 single-family dwelling) · interior minimum building site: 6000 sq ft (R-1 single-family dwelling)

    “single-family dwellings no 7,200 6,000 70 60 40% 35 20 15 10 15”
    One more reviewed finding on this topic
    • Specified — Single-family or duplex dwellings in the R-3 district inside Fort Jones city limits.
      “single-family or duplex dwellings no 6,000 6,000 70 60% 35 20 10 6 15 10 1,200 1 garage or carport per dwelling unit”
  • Lot coverageSpecified

    Single-family dwellings in R-1.

    maximum lot coverage: 40 percent (R-1 single-family dwelling)

    “single-family dwellings no 7,200 6,000 70 60 40% 35 20 15 10 15”
    One more reviewed finding on this topic
    • Specified — Single-family or duplex dwellings in R-3.
      “single-family or duplex dwellings no 6,000 6,000 70 60% 35 20 10 6 15 10 1,200 1 garage or carport per dwelling unit”
  • Building heightSpecified

    Single-family dwellings in R-1.

    maximum height: 35 ft (R-1 single-family dwelling)

    “single-family dwellings no 7,200 6,000 70 60 40% 35 20 15 10 15”
    One more reviewed finding on this topic
    • Specified — Single-family or duplex dwellings in R-3.
      “single-family or duplex dwellings no 6,000 6,000 70 60% 35 20 10 6 15 10 1,200 1 garage or carport per dwelling unit”

Still unanswered

We looked and could not find an official answer yet. Silence is not permission; ask Fort Jones or Siskiyou County directly.

  • Owner-builder exemption — Owner-builder exemptions inside Fort Jones city limits.
  • Certificate of occupancy — Certificate-of-occupancy requirements for land inside Fort Jones city limits.
  • Minimum dwelling size — Single-family residential districts inside Fort Jones city limits.
  • Tiny homes — Tiny-home occupancy inside Fort Jones city limits.
  • Off-grid sanitation — Off-grid sanitation inside Fort Jones city limits.
4 more unanswered
  • Agricultural exemption
  • Driveway access
  • Short-term rentals
  • Permit fees

Each answer was extracted from an official source and independently re-checked against that source by a second reviewer. That is an evidence check, not legal advice. Rules change; confirm with the authority before you buy or build.

Unanswered questions are usually a sign that Fort Jones publishes no rule on the point, not that none exists. Siskiyou County’s page lists the county offices to call.

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