Building permits, zoning and land rules in Butte County, California

Yes. Current code regulations require building permits when buildings are constructed, altered or improved in unincorporated Butte County, though specific code or statutory exemptions may apply¹. The Building Division administers permitting, plan review and inspections, and applications submitted after December 31, 2025 at 3:00 p.m. are reviewed under the 2025 Building Standards Codes¹¹. Building in a FEMA flood hazard zone adds review under Butte County's Flood Hazard Prevention Ordinance¹². Limited agricultural buildings such as qualifying barns, sheds, grain silos and livestock shelters still need a permit but use a simplified checklist and cannot be used for habitation¹³. An owner-builder may apply for a permit, but must sign the county acknowledgment and remains legally and financially responsible for the construction¹¹.

The Butte County Development Services Building Division handles building permits, plan review and inspections for unincorporated Butte County¹⁴. Zoning and land-use review is a separate step: the Planning Division confirms your parcel's zone, setbacks and any overlay before the Building Division will issue a permit¹⁵. Applicants can use the county's online Permit Portal to apply, follow status and request inspections, and the October 1, 2025 fee schedule excludes fees collected by other departments, so Environmental Health, Public Works, Fire and impact fees may come on top^14,16. Both divisions share the Development Services building in Oroville^14,15. If your project touches septic, wells or a driveway onto a county road, expect to also deal with Environmental Health and Public Works before the Building Division signs off^17,18.

Yes. Every parcel in Butte County's zoning jurisdiction has a base zone, overlay zone or both, and the county publishes its ordinance, zoning map, overlay maps and a parcel lookup tool². Incorporated cities such as Chico, Oroville, Paradise and Biggs keep separate zoning ordinances that do not govern unincorporated land¹⁹. The Town of Paradise zones its own land under Title 17 of its municipal code²⁰. In rural residential zones, minimum parcel size for a new lot ranges from 1 to 40 acres; urban residential districts range from 3,500 to 13,500 square feet, and those minimums apply to creating new parcels, so existing legal parcels below them can remain legal¹⁰. Primary structures in the listed residential zones are capped at 35 feet tall¹⁰. In AG and AS zones, primary structures generally have 20-foot front and street-side setbacks, a 25-foot rear setback, and an interior-side formula with a 5-foot floor; agricultural buffers and other exceptions still apply²¹. A new home near farming generally needs a 300-foot agricultural buffer unless the county approves an unusual-circumstances adjustment². Planning a lot split? Dividing land into five or more lots generally needs a tentative subdivision map, and fewer than five lots generally uses a tentative parcel map²². Confirm the parcel-specific zone and overlay with Planning¹⁵.

Butte County Environmental Health is the local permitting authority for septic systems, known as on-site wastewater treatment systems or OWTS, in unincorporated Butte County³. Inside the Town of Paradise, septic review and permits come from the town's on-site sanitary official instead, while Butte County Environmental Health is still referenced there for well approval⁴. You need a construction permit before you build or replace a system — only a qualifying graywater system is exempt — and that permit stays valid for two years from the date it's issued²³. Soils are a real constraint here: only 1.6% of Butte County's soils rate suitable for a conventional drain field under the USDA soil survey, so budget for a site evaluation and, on most parcels, an engineered or mound system rather than a standard trench field⁵. If a public sewer main runs within 250 feet of your lot and has capacity, the county requires connecting to it instead of installing a new septic system, though the Environmental Health Director can grant an exception case by case²³. Holding tanks, composting toilets and vault privies aren't allowed for a residence; they're permitted only for limited non-residential uses like agricultural storage buildings or primitive campsites where a full system isn't feasible²³. Any well on your property, domestic or agricultural, also needs an Environmental Health permit and must be drilled by a licensed C-57 water well contractor⁷.

Butte County does not allow an RV or other housing on wheels as a permanent dwelling on private property in unincorporated areas⁹. Owner-authorized RV or tent camping is allowed only in the AG, TM, TPZ, RC, RR and FR rural zones⁸. A currently registered RV with approved power, sewage disposal and domestic water is limited to 180 days annually and needs an Administrative Permit before connection; camping without those utilities is limited to 14 days in any 30-day period, with no more than two RVs or tents and two families at once⁸. A separate construction pathway allows temporary RV occupancy while building or rehabilitating a qualifying single-family home, with an Administrative Permit, active building permit, approved sewage disposal, milestones and time limits²⁴. A site-built tiny home is reviewed through the normal building permit process, must sit on a permanent foundation, and may be used as an accessory dwelling unit⁹. The county's handout uses the California Residential Code Appendix BB definition of a tiny house, 400 square feet or less excluding lofts, which still must meet foundation and fire sprinkler requirements, and not every type of tiny home qualifies as a permanent residence⁹. Manufactured homes may serve as single-family dwellings on lots zoned for conventional single-family homes when foundation, certification, development and permit requirements are met²⁵.

1. Confirm your parcel's zone, minimum lot size and any overlay with the Planning Division before you design anything^2,15.
2. Get a septic site evaluation and construction permit from Environmental Health if you won't be on public sewer; budget extra time if your soils need an engineered system^3,5.
3. Apply for a well permit through Environmental Health if you'll drill your own water source, using a licensed C-57 contractor⁷.
4. Submit the building permit application to the Building Division; an owner-builder must complete the acknowledgment before permit issuance¹¹.
5. Get flood review for a mapped flood-zone parcel and an encroachment permit if the driveway crosses a county road right-of-way^12,18.
6. Obtain the RV Administrative Permit before temporary onsite occupancy during construction²⁴.
7. Schedule required building and septic inspections as work progresses^11,23.

Ask Planning to confirm the parcel's zone, minimum lot size, overlays, applicable setbacks and whether the 300-foot agricultural buffer affects your homesite^2,15,21. Pull the flood hazard status; development in a mapped flood zone triggers review under Butte County's Flood Hazard Prevention Ordinance and may require an elevation certificate¹². Only about a third of county land has a slope of 15% or less, and over half is wooded, so inspect the actual grade and vegetation⁵. Confirm water feasibility with Environmental Health because every well needs a county permit and a licensed C-57 contractor⁷. A driveway crossing a county road right-of-way requires a Public Works encroachment permit; the office page lists a $440 fee, while the application process calls for a plot map, pre-inspection flag and at least 5 days of processing^18,26. Butte County experiences severe drought in roughly 38% of years, so verify water supply and storage⁵. The effective property tax rate is roughly 0.7%, or about $2,819 annually on a typical county home⁵.