Zoning, building permits and septic rules in Salmon, Idaho
Salmon is a city in Lemhi County, Idaho. Salmon adopts its own zoning, so inside its limits Salmon’s rules apply, not the county’s. 5 rules below are quoted from official sources and independently re-checked, most recently on October 22, 2026. Rules for unincorporated land are on the Lemhi County page.
Answers from the rulebook for Salmon
Salmon’s own rules
Building permitRequired
Land development and building activity inside Salmon city limits
Permit is required under chapter IV of the Salmon Development Code; the permit application procedure is in that chapter, which was not reproduced online.
Chapter 151 § 151.03 is titled 'building permits required' in the table of contents, but its text was not reached.
“requires a permit for all land development and building activity in the city and establishes procedures for the administration of this chapter”
Building code adoptedAdopted (with conditions)
Building construction inside Salmon city limits
Adopted editions are those adopted by the state or the state's building code board, with successive versions superseding the adopted versions when the building code board makes them effective (§ 151.01(b)).
Agricultural buildings are exempt under Idaho Code 39-4116 (§ 151.01(c)); see the agricultural_exemption claim.
Exceptions in §§ 151.02 and 151.03 were not reached within the research budget.
“the approved editions of the following nationally recognized codes, as adopted by the state or the state’s building code board, are adopted as the official building codes of the city, except as provided in §§ 151.02 and 151.03”
Local zoningPresent (with conditions)
Land inside Salmon city limits. Salmon city adopts its own zoning and subdivision regulations (the Salmon Development Code). Not the county area of city impact.
Adopted by reference in Salmon Code § 150.03(a); the zoning district text itself (chapters V and VI) is not reproduced on the American Legal Publishing copy, which is current only through ord. 21-849 (passed 5-19-2021).
Permit required for all land development and building activity under chapter IV of the Development Code.
“the city adopts by reference that certain document entitled the “salmon development code” as the official zoning and subdivision regulations of the city.”
Agricultural exemptionConditional
Agricultural buildings inside Salmon city limits only; this is a building-code exemption, not an owner-builder or farm-residence exemption
The building must be used solely for listed agricultural purposes (livestock shelters, poultry buildings, barns, horticultural structures, grain silos, or stables).
The property must be determined by the county assessor to be land actively devoted to agriculture.
Agricultural buildings may not be used as places of human habitation and must obtain a site permit from the city building department (§ 151.01(c)(3)).
“a building that meets the definition of agricultural building contained in division (c)(1)(a) above shall be exempt from the requirements of the building codes enumerated in idaho code 39-4103, and the rules promulgated by the state’s building code board, to the extent such exemption is provided in idaho code 39-4116, provided that both of the following criteria are met.”
Subdividing landRegulated (with conditions)
Division of land inside Salmon city limits
Procedures and criteria are in chapter VIII of the Salmon Development Code, which was not reproduced online.
“chapter viii. provides procedures and criteria for the division of land and development”
Still unanswered
We looked and could not find an official answer yet. Silence is not permission; ask Salmon or Lemhi County directly.
Owner-builder exemption — Owner-builder exemption from permits inside Salmon city limits
Inspections — Building inspections inside Salmon city limits
Certificate of occupancy — Certificate of occupancy inside Salmon city limits
Zoning districts — Zoning district map and list for Salmon city limits
Minimum dwelling size — Minimum dwelling size, main single-family residential district inside Salmon city limits
17 more unanswered
Minimum lot size
Setbacks
Lot coverage
Building height
Living in an RV
Camping on your land
Tiny homes
Accessory dwellings
Who permits septic
Septic permit
Septic inspection
Off-grid sanitation
Well permit
Mandatory utility hookup
Driveway access
Short-term rentals
Permit fees
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 Salmon publishes no rule on the point, not that none exists. Lemhi County’s page lists the county offices to call.
Off-grid gear
Going off-grid in Salmon means bringing your own water and power. The kit we’d start with:
