Churchill County

Churchill County Building Department issues building permits for residential structures (including second dwellings, accessory dwelling units, and guest houses) on parcels in unincorporated Churchill County, with zoning-compliance review provided by the Churchill County Planning Department. Central Nevada Health District (formerly Churchill County Health Department) and the Nevada Division of Environmental Protection (NDEP) administer on-site septic system permits, while the Nevada Division of Water Resources permits private wells; the substantial majority of unincorporated Churchill County's 4,929 square miles relies on on-site systems outside the City of Fallon's water and sewer service area. Churchill County contains one incorporated city — Fallon (county seat) — which permits its own ADUs and building activity inside city limits. Naval Air Station Fallon (NAS Fallon), the U.S. Navy's Naval Strike and Air Warfare Center ('Top Gun' successor program), is federal land and outside county zoning and permitting jurisdiction; military housing and contractor housing on NAS Fallon are governed by Navy authorities and federal law. The Fallon Paiute-Shoshone Tribe Reservation and Colony land at Stillwater are similarly outside county jurisdiction and are governed by the tribe's own land-use authorities and federal trust law.

Process overview: Adding a second dwelling or accessory dwelling unit on an unincorporated Churchill County parcel typically follows: (a) the applicant requests a zoning-verification letter from Churchill County Planning to confirm the parcel's zoning district, allowed accessory uses, applicable setbacks, height, lot coverage, and minimum lot size for a second dwelling; (b) if the proposed second dwelling is allowed by-right within the district's use table, the applicant proceeds directly to building-permit application; if it requires a conditional use permit (CUP), the applicant files a CUP application with Planning, pays the application fee, and the application is heard by the Churchill County Planning Commission with public notice and an opportunity for adjacent-property-owner comment; (c) the applicant submits building plans (site plan, floor plans, elevations, structural details, foundation plans, mechanical/electrical/plumbing) to the Churchill County Building Department for plan check against the adopted International Residential Code (IRC) and the Nevada-adopted versions of the IBC, IPC, IMC, and NEC; (d) for parcels outside Fallon water/sewer service, the applicant submits a septic system design (typically prepared by a licensed engineer or qualified designer with a percolation test and soil profile) and a well construction permit application to Central Nevada Health District and the Nevada Division of Water Resources; (e) for state-route frontage, NDOT issues an encroachment permit; (f) building permit issuance, construction, inspections, and certificate of occupancy. Total review and approval time is highly variable: a straightforward by-right second dwelling on a developed parcel with public water and sewer can be permitted in 30 to 60 days; a CUP-requiring application or one needing septic/well permits commonly takes 90 to 180 days. NAS Fallon's Accident Potential Zones (APZs) and Air Installation Compatible Use Zones (AICUZ) extending beyond the base perimeter add review considerations for parcels in the southeast, southwest, and east of Fallon.

Impact fees: Churchill County does not assess California-style 'impact fees' (no Mello-Roos, no Quimby Act parkland dedication) on second dwellings. The applicable charges are: (1) building permit and plan-check fees, calculated under the county's adopted fee schedule based on construction valuation; (2) septic system permit fees through Central Nevada Health District, typically $400-$800 depending on system type (conventional, sand-mound, ATU); (3) well construction permit fees through Nevada Division of Water Resources (typically $100-$300); (4) for parcels in the City of Fallon water and sewer service area, the applicable utility connection / capacity / system-development charges as set by the city; (5) NDOT encroachment fees for state-route frontage; (6) school impact fees in Nevada are administered through a residential construction tax (NRS 387.331) by Churchill County School District — typically a modest per-square-foot or per-unit charge. Total non-construction permit-fee burden for an unincorporated Churchill County second dwelling typically runs in the $1,500-$5,000 range, materially below California county comparables. Newlands Reclamation Project water rights — administered by the Truckee-Carson Irrigation District (TCID) — are a separate consideration for irrigated agricultural parcels; an ADU does not generally require a new water-right transfer, but consumption above the household-domestic baseline may require coordination with TCID. (schedule)

The Churchill County Assessor's Office maintains parcel-level assessment records for all real property in Churchill County, including parcels inside the City of Fallon. Nevada's assessment system is governed by NRS Chapter 361 and is materially different from California's Proposition 13 acquisition-value framework: Nevada uses a cost-approach reappraisal framework with a five-year reappraisal cycle and statutory caps on year-over-year tax increases (NRS 361.4722-361.4724) of 3% on owner-occupied primary residences and 8% on most other property. Real property is assessed at 35% of taxable value (NRS 361.225), where taxable value is determined as the lesser of (a) the cost of replacement (less depreciation at 1.5% per year up to 75 years) plus full cash value of the land, or (b) full cash value. An ADU or second dwelling added to a parcel is treated as new construction: the assessor adds the ADU's depreciated replacement cost to the improvement portion of the parcel's taxable value, prorated from the date of completion, and the new total taxable value carries forward subject to the statutory cap on tax increase.

Assessment policy: An ADU or second dwelling is added to the parcel's taxable value as new improvement at the depreciated replacement cost as of the date of completion, prorated from the date of certificate of occupancy through the end of the fiscal year (Nevada's fiscal year is July 1 to June 30; tax bills are issued in August). The assessor follows the Nevada Tax Commission and Department of Taxation Manual of Methodology for valuation of single-family residential improvements; replacement cost is calculated using the Marshall & Swift cost-data system as adopted by the state. Annual depreciation accrues at 1.5% per year for up to 50 years, with floor at 25% of replacement cost for older structures (NRS 361.227). For typical 600-1,000 sqft ADUs in Churchill County's construction-cost environment (materially lower than California; comparable to other rural Nevada counties), expected new improvement value falls in the $80,000-$170,000 range, yielding an approximate annual property-tax increase of $400-$1,000 at the combined Churchill County effective rate (county base + Churchill County School District override + applicable rural fire-district and library-district overrides; total combined rate typically falls in the $2.50-$3.50 per $100 of assessed value range, against the 35% assessment ratio). The 3% cap on owner-occupied primary residences (NRS 361.4722) operates on the prior-year tax bill, not on the assessed value, so a large new-construction ADU may take several years to fully reflect in taxes paid.

Churchill County's overlay regimes that materially affect ADU siting on unincorporated parcels are: (1) Naval Air Station Fallon Air Installation Compatible Use Zone (AICUZ) and Accident Potential Zones (APZs) — NAS Fallon is the U.S. Navy's premier strike and air-warfare training installation ('Top Gun' successor program), and its noise contours and accident-potential zones extend several miles beyond the base perimeter into unincorporated Churchill County, materially affecting parcels in southeast and southwest Fallon; (2) FEMA Special Flood Hazard Areas (SFHA) along the Carson River as it terminates in the Carson Sink and Stillwater National Wildlife Refuge, the Lahontan Reservoir on the western county boundary, and the various Newlands Reclamation Project canals (the Truckee Canal, the V-Line Canal, the L-Line Canal); (3) Stillwater National Wildlife Refuge and the surrounding Lahontan Valley wetlands — a federally-administered wildlife area at the Carson River terminus, with environmental compatibility considerations for adjacent private parcels; (4) Wildland-Urban Interface (WUI) and rangeland fire considerations in the Stillwater Range, Clan Alpine Mountains, Sand Springs Range, and Desatoya Mountains in eastern Churchill County; (5) Fallon Paiute-Shoshone Tribe Reservation and Colony lands at Stillwater (outside county jurisdiction); (6) Newlands Reclamation Project water-rights overlay administered by the Truckee-Carson Irrigation District (TCID) for the irrigated alfalfa, dairy, and seed-crop agricultural areas served by the federal Newlands Project (the first Reclamation Act project in the U.S., authorized 1902); (7) NAS Fallon's Bravo Range complexes (Bravo-16, Bravo-17, Bravo-19, Bravo-20) — extensive military training-range areas in the eastern and southern county that are off-limits to civilian development. Nevada has no analog to California's Coastal Commission and Churchill has no coastal exposure.

• Naval Air Station Fallon AICUZ and Accident Potential Zones (APZ-1, APZ-2, Clear Zone) — An ADU within the NAS Fallon AICUZ noise contours should incorporate noise-attenuation construction (STC-rated windows, forced-air HVAC with acoustic treatment, sealed exterior wall assemblies) — typically targeting interior 45 dB DNL where exterior is 65+ dB DNL. APZ-1 parcels generally cannot accommodate new residential development; APZ-2 can accept low-density residential including ADUs subject to density limits. Clear Zone parcels are off-limits for residential. NAS Fallon hosts the Navy's premier strike-warfare training program, including F/A-18 Super Hornet and EA-18G Growler operations, with fleet replacement squadron training, joint and combined exercises, and SEAL training rotations; aircraft operations are intense and the noise environment is significant on adjacent parcels. The ongoing NAS Fallon Range Train Complex (FRTC) modernization (Congressionally authorized 2022) involves expansion of training-range areas in the Bravo-17 complex, which has prompted JLUS updates; Churchill County is an active participant.
• FEMA Special Flood Hazard Areas (SFHA) — National Flood Insurance Program — An ADU in an SFHA must be elevated to or above Base Flood Elevation plus the county's adopted freeboard (typically 1 foot), with flood vents on enclosures below BFE, anchoring against floatation and lateral forces, and a post-construction Elevation Certificate. Zone A (no published BFE) parcels — common in the rangeland fringe — require an engineer-commissioned BFE study. The Carson River sink terminal-delta hydrology is unusual: water has nowhere to drain to, and unusually wet years can flood vast areas of the Lahontan Valley as water backs up through the canal network and overtops natural drainage divides. Newlands Project canal-proximity floodplain mapping is increasingly important as canal infrastructure ages. NFIP flood insurance is required for federally-backed mortgages on SFHA parcels.
• Stillwater National Wildlife Refuge and Lahontan Valley Wetlands — An ADU on a parcel adjacent to Stillwater NWR or within the Lahontan Valley wetlands matrix should incorporate dark-sky lighting (downcast, full-cutoff fixtures), avoid raptor-collision hazards (no large reflective windows facing wetland approach corridors), and coordinate any agricultural-chemical use with refuge-adjacent buffer recommendations. The wetlands' migratory-bird value is internationally significant (designated a Western Hemisphere Shorebird Reserve Network site), and adjacent residential use should respect that ecological context.
• Wildland-Urban Interface (WUI) — Bureau of Land Management Stillwater Field Office, Nevada Division of Forestry — An ADU in a fire-prone area of Churchill County should incorporate ignition-resistant exterior wall assemblies, Class A roofing, ember-resistant vents, and minimum 30-foot defensible space (Zone 1: 0-5 ft non-combustible; Zone 2: 5-30 ft lean/clean/green) where consistent with the local fire protection district's standards. Private wells with on-site water storage tanks (typically 2,500-5,000 gallons for fire-flow) are commonly required for parcels without hydranted municipal water. AB 376 (2025, effective 2026-01-01) authorizes wildfire-coverage exclusions in Nevada; ADU owners in WUI areas should plan for separate stand-alone wildfire coverage where available.
• Newlands Reclamation Project water-rights overlay (Truckee-Carson Irrigation District) — An ADU on a Newlands Project irrigated parcel should be designed to respect the parcel's water-right structure: (a) household-domestic water for the ADU is generally accommodated within existing rights, but heavy outdoor use (irrigation of additional landscape) requires coordination with TCID; (b) septic-system siting must respect canal and lateral setbacks (typically 100 feet from active canal centerlines); (c) any new or modified water connection to TCID-served water requires district approval. The irrigated agricultural status of these parcels is a defining characteristic and limits the scope of non-agricultural development; ADUs as workforce or family housing accessory to the primary agricultural use are commonly accepted, while ADUs as unrelated-party long-term or short-term rentals can raise compatibility questions.
• NAS Fallon training-range complex (Bravo-16, Bravo-17, Bravo-19, Bravo-20) and Federal lands proximity — An ADU on a private inholding within or adjacent to BLM lands should verify legal access (recorded easement or federal right-of-way grant), utility crossing permits if power, water, or sewer lines cross federal lands, and grazing-allotment proximity. ADUs near Bravo-range fence lines should anticipate occasional munition-noise exposure and the very small (but non-zero) risk of unexploded-ordnance encroachment from past range activity (Bravo-16 has had historic incidents; ranges operated by NAS Fallon are well-managed and overflight protocols are well-established). The federal-lands context shapes Churchill County's settlement pattern (concentrated in the irrigated Lahontan Valley around Fallon) and constrains ADU development to the established private-land matrix.