Bolthole Index

Nez Perce County, Idaho

Building permits, zoning and land rules in Lewiston, Idaho

Lewiston, Idaho requires a building permit for construction and other work on buildings regulated by its code; City Building Services handles applications and review.12 Lewiston administers its own zoning, including manufactured-home and RV park rules.3 Septic installation permits and site evaluations are handled by Public Health - Idaho North Central District, separately from city building review.4

At a glance

Building permits
City building permit required for code-regulated construction and alterations1
Zoning
City Planning & Zoning administers the zoning code3
Septic
Public Health - Idaho North Central District evaluates sites and issues installation permits4
Lot size
R-2 single-family minimum: 7,500 square feet, subject to referenced code exceptions5
Tiny house villages
Maximum building height: 16 feet; this standard applies to villages6
Owner-builder
State contractor-registration exemption available when owners do their own work and do not intend to sell within 12 months7
Private wells
IDWR drilling permit required before drilling, including domestic wells8

Who to call

Building permits

City of Lewiston Building Services

City building applications, plan review, fees and inspections

208-746-1318

cd@cityoflewiston.org

215 D Street

Building permits

City of Lewiston Building Services — Permit Types

Building and right-of-way permit scope

Zoning

City of Lewiston Planning & Zoning

City zoning, land-use applications and development questions

208-746-1318

215 D Street

Septic permits

Public Health - Idaho North Central District

Onsite sewage site evaluations, permits and inspections

208-799-3100

215 10th Street, Lewiston, ID 83501

Contact details are copied from each office’s official page and were checked against it on October 11, 2026.

Off-grid gear

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

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Do you need a building permit in Lewiston, ID?

Lewiston requires a building permit when a code-regulated building or structure is constructed, altered, enlarged, moved, repaired, converted or demolished.1 Lewiston adopts and amends the International Residential Code for residential construction inside city limits.9 City building-permit applications and construction documents undergo review and approval by several city departments.2 For a proposed house or remodel, send the project description to City Building Services and ask which building and trade applications the work needs.10

Who issues building permits in Lewiston, and how do you apply?

City of Lewiston Building Services accepts building-permit submissions and questions through its permit portal; permit representatives also take questions at cd@cityoflewiston.org or 208-746-1318, option 1.10 Lewiston reviews its building-services fees yearly and provides a fee schedule and calculator spreadsheets on request, so ask for a project estimate rather than assuming a flat building-permit charge.11 City plan review checks construction plans against applicable codes and standards across multiple departments.10

Does Lewiston have zoning, lot-size and accessory-building rules?

Lewiston Planning & Zoning administers the city zoning code and reviews land-use applications.3 In Lewiston’s R-2 low-density residential zone, the minimum lot area for a single-family dwelling is 7,500 square feet, subject to the code provisions referenced in that district rule.5 Detached accessory buildings serving single-family or two-family dwellings must satisfy the applicable district’s maximum lot coverage together with all other buildings on the lot.12 Ask City Planning & Zoning to identify the parcel’s district and applicable setbacks before drawing the house and outbuildings.3

How do septic permits and private wells work inside Lewiston?

Public Health - Idaho North Central District conducts onsite sewage site evaluations, issues septic installation permits and inspects onsite systems; city building review is a separate process.4 Idaho generally requires a septic installation permit for installation, modification, repair or expansion, subject to specified exceptions for temporary nondischarging systems and limited repairs.13 A septic permit may be denied where public or central wastewater treatment is reasonably accessible, so discuss sewer availability before planning a septic system in Lewiston.14 A private well requires an IDWR drilling permit before drilling and a licensed well driller.8

Can you live in an RV or tiny home on land in Lewiston?

Lewiston’s Planning & Zoning division administers the city’s manufactured-home and RV park code; ask that office about the proposed parcel and occupancy arrangement before relying on an RV as housing.3 Lewiston’s tiny house village standards cap building height at 16 feet, using the zoning code’s definition of building height.6 That village-specific height limit does not establish permission for a standalone tiny house on every residential lot.6 Idaho requires manufactured-home installations to be inspected and approved by DOPL or the authority having jurisdiction before occupancy.15

What are the steps to build a home in Lewiston?

  1. Ask City Planning & Zoning about the lot’s zoning and proposed use; city planning staff also coordinate subdivision work with Public Works Engineering.3
  2. Submit the building application and construction documents to City Building Services for city-department review.210
  3. Resolve wastewater arrangements with the health district if proposing septic; reasonably accessible public wastewater facilities can affect septic approval.414
  4. Arrange the inspections included in the issued city permit and obtain final approvals; Lewiston then issues a certificate or letter of completion.1617

For property outside Lewiston city limits, use the Nez Perce County guide for the county building and zoning requirements.1819

Watch-outs

  • We could not confirm Lewiston’s general minimum dwelling size or permission for RV occupancy on a private residential lot; ask City Planning & Zoning about the intended use.3
  • Idaho’s owner-builder contractor-registration exemption requires owners to do their own work on their own land without intending to sell within 12 months; state homeowner permit procedures still apply where applicable.720
  • Lewiston requires a right-of-way permit for curb and sidewalk work, street cuts and other work or use of the right-of-way; ask City Building Services which application covers the proposed access work.1

Sources

  1. City of Lewiston Building Services — Permit Types (cityoflewiston.org)
  2. Permit Review Schedule | Lewiston, ID (Lewiston), quoted and re-checked
  3. City of Lewiston Planning & Zoning (cityoflewiston.org)
  4. Public Health - Idaho North Central District (idahopublichealth.com)
  5. Code of Ordinances: Sec. 37-29 - Lot size (Lewiston), quoted and re-checked
  6. Code of Ordinances: Sec. 23-22 - Development standards (Lewiston), quoted and re-checked
  7. Frequently Asked Questions (FAQ) - Division of Occupational and Professional Licenses (Idaho statewide rule), quoted and re-checked
  8. Wells Overview (Idaho statewide rule), quoted and re-checked
  9. Code of Ordinances: Section 10-9—International Residential Code—Amendments (Lewiston), quoted and re-checked
  10. City of Lewiston Building Services (cityoflewiston.org)
  11. Building Services | Lewiston, ID (Lewiston), quoted and re-checked
  12. Code of Ordinances: Sec. 37-131 - General provisions, accessory buildings (Lewiston), quoted and re-checked
  13. IDAPA 58.01.03 – Individual/Subsurface Sewage Disposal Rules and Rules for Cleaning of Septic Tanks (Idaho statewide rule), quoted and re-checked
  14. IDAPA 58.01.03 Individual/Subsurface Sewage Disposal Rules (Idaho statewide rule), quoted and re-checked
  15. Building Archives - Division of Occupational and Professional Licenses (Idaho statewide rule), quoted and re-checked
  16. Building Services | Lewiston, ID (Lewiston), quoted and re-checked
  17. Building Services | Lewiston, ID (Lewiston), quoted and re-checked
  18. Building Permits, Nez Perce County Planning and Building (2026 county census)
  19. Planning and Building, Nez Perce County (2026 county census)
  20. How To Purchase a Trade Permit (Idaho statewide rule), quoted and re-checked

Written October 11, 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 Lewiston

Lewiston’s own rules

  • Building permitRequired

    Buildings and structures regulated by code inside Lewiston city limits.

    • The city list includes alteration, construction, conversion, demolition, enlargement, erection, improvement, moving, removal, and repair.
    “Required whenever a building or structure, regulated by the code is:”
  • Building code adoptedAdopted (with conditions)

    Residential construction inside Lewiston city limits.

    • The city adopts the International Residential Code through section 10-1 and applies local amendments in section 10-9.
    “The International Residential Code, compiled by the International Code Council, adopted by section 10-1 of this Code, is hereby amended as follows:”
  • InspectionsRequired

    Projects issued a Lewiston permit.

    • The city provides building, electrical, plumbing, and mechanical inspections as part of the issued permit; a final inspection follows completion.
    “Once your project has been completed a final inspection will be done by all inspectors included in the project.”
  • Certificate of occupancyLimited

    Projects issued a Lewiston permit.

    • After completion, all project inspectors conduct a final inspection; issuance follows all inspectors' approval and may be a certificate or a letter of completion.
    “Once all inspectors have approved your project, a certificate or letter of completion will be issued to you.”
  • Local zoningPresent (with conditions)

    Land inside Lewiston city limits.

    • Chapter 37 applies zoning districts and district-specific development standards.
    “In an R-2 zone, the minimum lot size shall be as follows:”
  • Minimum lot sizeDistrict specific (with conditions)

    Single-family dwellings in the R-2 low-density residential zone inside Lewiston city limits.

    • Subject to Code sections 32-45(f)(1) and 36-103.

    minimum lot area: >= 7500 square feet (Single-family dwelling)

    “minimum lot area shall be seven thousand five hundred (7,500) square feet”
  • Lot coverageDistrict specific (with conditions)

    Lots with detached accessory buildings serving single-family or two-family dwellings inside Lewiston city limits.

    • The applicable zoning district's maximum lot coverage controls the combined buildings on the lot.
    “Such buildings shall comply, in combination with all the buildings on the lot, with the maximum allowable lot coverage of the applicable zoning district.”
  • Building heightSpecified

    Tiny house villages inside Lewiston city limits.

    • The height definition is that in chapter 37 of the city code.

    maximum building height: <= 16 feet (tiny house village)

    “Building height. The maximum building height, as defined in chapter 37 of this Code, shall be sixteen (16) feet.”
    One more reviewed finding on this topic
  • Manufactured homesLimited

    Replacement units in manufactured home parks developed after January 22, 2006, inside Lewiston city limits.

    • Only tiny houses and manufactured homes meeting section 23-11(a) may be replacement units in these parks.
    “Only tiny houses, as defined in article III of this chapter, and manufactured homes meeting the requirements of subsection 23-11 (a) of this article, shall be permitted as replacement units in manufactured home parks developed after January 22, 2006.”
  • Agricultural exemptionConditional

    Documented agricultural buildings inside Lewiston city limits that are exempt from building permits.

    • They must meet applicable minimum front and street-side setbacks and five-foot minimum side and rear setbacks.

    minimum side and rear setback: >= 5 feet (documented agricultural buildings exempt from building permits)

    “These provisions shall not apply to buildings exempt from building permits, such as agricultural buildings, and that are documented as such, except that such buildings shall meet the required minimum front and street side yard setbacks of the applicable zoning district and shall maintain five-foot minimum side and rear yard setbacks.”
  • Permit feesVariable (with conditions)

    City building-services fees inside Lewiston city limits.

    • Fees are reviewed yearly; the page directs applicants to request the fee schedule and calculator spreadsheets from Building Services.
    “Our fees are reviewed on a yearly basis, you can request a fee schedule and user-friendly fee calculator spreadsheets by contacting building services.”
  • Permit processPublished (with conditions)

    Building-permit projects inside Lewiston city limits.

    • For larger projects, applicants are encouraged to use a preliminary Development Review Committee meeting; listed review periods are goals rather than guarantees.

    single-family dwelling and duplex new-construction review goal: <= 14 calendar days (8 calendar days for minor revisions)

    “New Construction (Single Family Dwelling and Duplex) | 14 | 8”

Rules another office applies inside Lewiston

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

  • SetbacksSpecified

    Development in Lewiston's R-2 Low Density Residential Zone.

    • Except as provided in article VIII; front yard is 20 feet or 35 feet from street centerline, whichever is greater; side-yard and rear-yard rules also apply.

    minimum front yard: >= 20 feet (or 35 feet from centerline of street, whichever is greater)

    “A front yard shall be a minimum of twenty (20) feet or thirty-five (35) feet from the centerline of the street, whichever is greater.”

Still unanswered

We looked and could not find an official answer yet. Silence is not permission; ask Lewiston or Nez Perce County directly.

  • Owner-builder exemption — Owner-built residential construction inside Lewiston city limits.
  • Minimum dwelling size — Primary dwellings inside Lewiston city limits.
  • Who permits septic — On-site wastewater systems inside Lewiston city limits.
  • Septic permit — On-site wastewater systems inside Lewiston city limits.
  • Septic inspection — On-site wastewater systems inside Lewiston city limits.
5 more unanswered
  • Off-grid sanitation
  • Well permit
  • Driveway access
  • Building in a floodplain
  • Short-term rentals

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 Lewiston publishes no rule on the point, not that none exists. Nez Perce County’s page lists the county offices to call.

← All of Nez Perce County: county rules, score and offices