Nez Perce County, Idaho requires building permits for new homes, remodels, additions, manufactured-home placement, accessory buildings and agricultural buildings.1 County Building Services enforces the 2018 International Building Code, while zoning districts set parcel-specific standards.23 Septic permits come from the public health district, and well drilling requires a separate state permit.45
At a glance
- Building permit
- Required for new construction, home alterations, manufactured homes, accessory buildings and agricultural buildings1
- Building code
- County Building Services enforces the 2018 International Building Code2
- Zoning
- Yes; district rules control lot size, setbacks, coverage and height3
- Septic
- Permit, site evaluation and inspection through Public Health - Idaho North Central District678
- RV living
- A hardship RV is a conditional use, renewable annually while the qualifying hardship continues9
- Owner-builder
- Conditional contractor-registration exemptions cover work on personal residential property and work contracted to a registered contractor1011
- Wells
- A drilling permit and an IDWR-licensed driller are required5
- Minimum home size
- Not confirmed; ask Planning and Building for the parcel's standard12
Who to call
Building permits
Nez Perce County Planning and Building - Building Services
County building permits, applications and building-code questions
Courthouse, 3rd Floor, 1230 Main Street, Lewiston, ID 83501
Zoning
Nez Perce County Planning and Building
Land-use applications, conditional uses, subdivisions, variances and zone changes
Courthouse, 3rd Floor, 1230 Main Street, Lewiston, ID 83501
Septic permits
Public Health - Idaho North Central District
Onsite sewage site evaluations, permits and inspections
215 10th Street, Lewiston, ID 83501
Floodplain permits
Nez Perce County Floodplain Administrator
Floodplain development forms and permit questions
Courthouse, 3rd Floor, 1230 Main Street, Lewiston, ID 83501
Roads & driveways
Nez Perce County Road and Bridge Department
County road approach and utility encroachment permits
3215 E. Main Street, Lewiston, ID 83501
Contact details are copied from each office’s official page and were checked against it on September 29, 2026.
Do you need a building permit in Nez Perce County, Idaho?
Yes. Nez Perce County requires permits for new construction, home remodels and additions, manufactured-home placement, commercial structures, accessory buildings and agricultural buildings.1 Building Services checks applicable work against the 2018 International Building Code.2 The county provides downloadable applications and courthouse pickup.13
Separate approvals can apply. Electrical, plumbing and HVAC work requires trade permits.14 In a floodplain, the administrator may inspect before issuing the Certificate of Compliance, and the development cannot be occupied until that certificate is issued.1516 Every manufactured-home installation must be inspected and approved before occupancy; ask Building Services whether county or state installation administration applies.1718
Who issues Nez Perce County building permits, and how do you reach them?
Nez Perce County Planning and Building - Building Services is the county building department.19 Call 208-799-3197 or visit 1230 Main Street in Lewiston for applications and county requirements.19 Land-use questions go to Planning and Building at 208-799-3089 or [email protected].20
Bring the parcel number and a project description. Ask which packet applies, what plans are needed and which inspections will follow. The published process covers residential, manufactured-home, commercial, accessory, agricultural, remodeling and addition projects.13 For county-road access, Road and Bridge publishes an approach permit; call 208-799-3060 or visit 3215 E. Main Street in Lewiston.21
Does Nez Perce County have zoning?
Yes. Nez Perce County maps zoning outside city limits and publishes district-specific standards.3 The Agriculture zone has a 5-acre minimum lot, Rural Residential has a 1-acre minimum, and Single-Family Residential has a one-half-acre minimum.22
Road setbacks are generally 20 feet from the property line or 45 feet from the road centerline, whichever is greater; other setbacks vary.23 Buildings in the RR Rural Residential and R-1 Single-Family Residential districts are capped at 35 feet.2425 Cited lot-coverage limits are 50 percent in Rural Residential and 40 percent in Single-Family Residential, while Agriculture states no limit.26 Confirm the parcel's district before designing.20
How do septic permits work in Nez Perce County?
Public Health - Idaho North Central District handles onsite wastewater permits for Nez Perce County.6 A property owner should obtain a site evaluation before buying land and must obtain a district permit before installing an individual septic system.7 The public health district inspects the installed system.8 Call 208-799-3100 or visit 215 10th Street in Lewiston.27
Only 3.9% of county soils are rated without severe limitations for a conventional drain field, so evaluate septic early.28 No system may receive wastewater before final inspection; when preparation is needed, provide at least 48 hours' notice, excluding weekends and holidays.29 A permit may be denied where public or central treatment is reasonably accessible, but that is not a universal connection mandate.30
Can you live in an RV or tiny home in Nez Perce County?
In unincorporated Nez Perce County, a recreational vehicle used for a qualifying family hardship requires a conditional-use permit.9 Approval lasts 1 year, may be renewed annually while the hardship continues, and requires removal when the hardship ends.9 That narrow route is not general permission for RV residence; ask Planning and Building about the parcel and proposed duration.20
Manufactured homes are permitted uses in at least the RR and R-1 districts, subject to the rest of the land code, while a hardship manufactured home is a conditional use.31 Manufactured-home placement also needs a building permit.1 Nez Perce County has not confirmed a specific tiny-home rule or general minimum dwelling floor area; ask Planning and Building how the unit will be classified.20
Building a home in Nez Perce County: the steps, in order
- Confirm zoning, use, lot size, setbacks, coverage and height.3
- Ask Road and Bridge about county-road access; state-highway access requires an ITD encroachment permit.2132
- Obtain an IDWR drilling permit and licensed driller for a well.5
- Arrange the health district's septic site evaluation and permit.7
- Determine whether floodplain approval applies.33
What should you check before buying land in Nez Perce County?
Confirm zoning before treating acreage as buildable. Published minimum lots range from one-half acre to 5 acres in the cited districts, with parcel-specific setbacks, coverage and height.22232634
Check water, wastewater, flood exposure and legal access. A well needs a drilling permit and licensed driller, and difficult soils make early septic evaluation valuable.528 Floodplain work requires approval before construction and compliance before occupancy.33 County-road approaches go through Road and Bridge; state-highway access goes through ITD.2132 The effective property-tax rate is about 0.9%, with a median annual bill near $2,529.3536
Watch-outs
- Idaho's owner-builder registration exemptions do not waive Nez Perce County permits or zoning.10111
- An owner may qualify by working on personal residential property or by contracting work on the owner's property to a registered contractor, but anti-evasion and resale conditions apply.1011
- Agricultural buildings require county permits; a general agricultural exemption was not confirmed.1
- Hardship RV approval is not a general RV-residence permit; ask Planning and Building about other RV use.920
Sources
- Building Permits, Nez Perce County Planning and Building, quoted and re-checked
- Building Permits, Nez Perce County Planning and Building, quoted and re-checked
- Interactive Web Map Terms of Use, Nez Perce County, quoted and re-checked
- Septic and Septage, quoted and re-checked
- Wells Overview, quoted and re-checked
- Applications, Nez Perce County Planning and Building, quoted and re-checked
- Septic and Septage - Idaho Department of Environmental Quality, quoted and re-checked
- Septic and Septage - Idaho Department of Environmental Quality, quoted and re-checked
- Nez Perce County Land Development Code, quoted and re-checked
- Idaho Code § 54-5205 — Exemptions from registration, quoted and re-checked
- Idaho Code § 54-5205 — Exemptions from registration, quoted and re-checked
- Nez Perce County - Planning and Zoning Commission (2026 county census)
- Building Permits, Nez Perce County Planning and Building, quoted and re-checked
- Frequently Asked Questions (FAQs) - Division of Occupational and Professional Licenses (Idaho statewide rule), quoted and re-checked
- Floodplain Development Permit, quoted and re-checked
- Floodplain Development Permit, quoted and re-checked
- Building Archives - Division of Occupational and Professional Licenses (Idaho statewide rule), quoted and re-checked
- Building Archives - Division of Occupational and Professional Licenses (Idaho statewide rule), quoted and re-checked
- Nez Perce County Planning and Building - Building Services (co.nezperce.id.us)
- Nez Perce County Planning and Building (co.nezperce.id.us)
- Nez Perce County Road and Bridge Department (co.nezperce.id.us)
- Subpart B - Land Development Code (LDC), quoted and re-checked
- Subpart B - Land Development Code (LDC), quoted and re-checked
- Nez Perce County Land Development Code, quoted and re-checked
- Nez Perce County Land Development Code, quoted and re-checked
- Subpart B - Land Development Code (LDC), quoted and re-checked
- Public Health - Idaho North Central District (idahopublichealth.com)
- Share of soils without severe limits for a conventional septic drain field (USDA SSURGO): Bolthole Index county data
- IDAPA 58.01.03 Individual/Subsurface Sewage Disposal Rules (Idaho statewide rule), quoted and re-checked
- IDAPA 58.01.03 Individual/Subsurface Sewage Disposal Rules (Idaho statewide rule), quoted and re-checked
- Nez Perce County Land Development Code, quoted and re-checked
- Types of Right-of-Way Encroachment Permits (Idaho statewide rule), quoted and re-checked
- Floodplain Development Permit, quoted and re-checked
- Subpart B - Land Development Code (LDC), quoted and re-checked
- Effective property tax rate: Bolthole Index county data
- Median property tax bill: Bolthole Index county data
Written September 29, 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.