Trinity County · Building on your lot
Building on your lot in Trinity County
Trinity County's code applies only in unincorporated areas. It sets its own limits on fences, accessory structures and home occupations, and home-occupation rules depend on minor or major type.
Key points
- Fence height: In R-1 and R-2 districts, Trinity County limits fences to 6 feet, or 3 feet in a required front yard on reversed frontage.
- Accessory structures: Trinity County limits detached accessory structures, except agricultural ones, to 25 feet unless a planning commission use permit allows more.
- Home businesses: For minor home occupations, Trinity County allows at most 2 visiting vehicles at a time and 1 off-site employee.
Each rule below is marked Trinity County code or CA state law and links to the section it comes from (checked October 2026). General information, not legal advice.
Trinity County's code applies in the unincorporated areas of the county. Cities in Trinity County have their own codes and their own pages.
Fences and walls
| Height anywhere on the lot |
|
|---|---|
| Front yard height |
|
Sheds, garages and other accessory structures
Trinity County code Trinity County limits detached accessory structures, except agricultural ones, to 25 feet unless a planning commission use permit allows more.
All 4 Trinity County rules on sheds, garages and other accessory structures, with the code text →
Running a business from home
Trinity County code For minor home occupations, Trinity County allows at most 2 visiting vehicles at a time and 1 off-site employee.
All 17 Trinity County rules on running a business from home, with the code text →
Solar panels and EV chargers
| EV charger permit |
|
|---|
Swimming pools
Trinity County code The pool must be completely enclosed by a fence. At least 6 feet high.
All 7 Trinity County rules on swimming pools, with the code text →
Building in a flood zone
Trinity County code A floodplain development permit is needed before construction or development begins. No encroachment unless it causes no increase in base flood elevation.
All 3 Trinity County rules on building in a flood zone, with the code text →
Grading and erosion control
| When a grading permit is needed |
|
|---|---|
| Grading without a permit |
|
Family child care homes
| Zoning | A small or large family child care home is a residential use and a use by right under all local ordinances, including zoning |
|---|---|
| Business license or fee | A city or county may not charge a business license, fee or tax to run a family child care home |
| Local rules | Local limits on height, setbacks, lot size, health and safety must be the same as for every other home in the same zone |
| Small home | Up to eight children, counting the provider's own children under 10 who live there |
| Large home | 7 to 14 children, counting the provider's own children under 10 who live there |
Home alarm permits and false alarms
| Alarm permit |
|
|---|
Who this affects
Frequently asked questions
How tall can a fence be in Trinity County?
In R-1 and R-2 districts, Trinity County limits fences to 6 feet, or 3 feet in a required front yard on reversed frontage.
Do I need a permit for solar panels or an EV charger in Trinity County?
Trinity County's code: The building official approves and issues permits when the application meets the county checklist; electronic submittal and signatures accepted. (§ 15.26.040).
What are the grading rules in Trinity County?
Trinity County's code: More than 800 cubic yards, or more than 20,000 square feet graded. (Unincorporated county; such grading is restricted unless exempt, for example with a use permit.) (§ 15.24.020); Grading existing access roads, private roads and driveways; fire safety work grading at most 2 feet above or below ground. (Fire safety work may not substantially change the natural contour.) (§ 15.24.040).
Can I run a family child care home in Trinity County?
California law sets this for every city, including Trinity County: Zoning: A small or large family child care home is a residential use and a use by right under all local ordinances, including zoning (Health & Safety Code § 1597.45(a)); Business license or fee: A city or county may not charge a business license, fee or tax to run a family child care home (Health & Safety Code § 1597.45(b)); Local rules: Local limits on height, setbacks, lot size, health and safety must be the same as for every other home in the same zone (Health & Safety Code § 1597.45(e)); Small home: Up to eight children, counting the provider's own children under 10 who live there (Health & Safety Code § 1596.78(c)); Large home: 7 to 14 children, counting the provider's own children under 10 who live there (Health & Safety Code § 1596.78(b)).
Do I need a permit for a home alarm in Trinity County?
Trinity County's code: A county sheriff permit is required to install or use a telephonic alarm device that automatically dials a telephone (Unincorporated part of the county) (§ 9.04.030).
General information, not legal advice.
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