Building Safety in Idaho (2026)
37 rules on the books across Idaho, 9 cities and counties. Select a rule to read the full details.
Severity: Few Restrictions · Light Restrictions · Some Restrictions · Significant Restrictions · Heavy Restrictions
Fire Sprinkler Requirements
When residential and commercial buildings must install fire sprinkler systems, including new-construction triggers and major-renovation thresholds.
Ada County
Light RestrictionsAda County deletes the 2018 International Residential Code's automatic fire sprinkler mandate for one- and two-family…
Read full rule →Boise
Few RestrictionsBoise deleted the IRC mandate for automatic fire sprinklers in new one- and two-family homes, so most single-family and…
Read full rule →Caldwell
Few RestrictionsCaldwell struck the IRC's one- and two-family automatic fire sprinkler mandate entirely and softened the townhouse…
Read full rule →Idaho Falls
Few RestrictionsIdaho Falls deletes the Residential Code's automatic fire-sprinkler mandate for new one- and two-family homes, and…
Read full rule →Childcare Center Rules
Building safety standards specific to family childcare homes and centers, including egress, sprinklers, lead and asbestos clearances, and outdoor play standards.
Ada County
Some RestrictionsAda County's building code lets a home-based daycare for 12 or fewer children operate as an ordinary single-family home…
Read full rule →Boise
Some RestrictionsBoise's building code treats a home daycare of 12 or fewer children as an ordinary residential occupancy; larger…
Read full rule →Caldwell
Some RestrictionsCaldwell regulates in-home daycares, daycare centers, and preschools under City Code § 10-12-03-14. In or next to a…
Read full rule →Canyon County
Some RestrictionsCanyon County's building code chapter adopts the 2018 International Residential Code's Appendix M, "Home Day Care - R3…
Read full rule →Door Locking Hardware
Code requirements for emergency-egress door hardware, including thumb-turn locks, panic bars, and one-action egress required by the building code.
Green Building Code
CALGreen and equivalent state green building codes, plus reach codes that go further (electric-only new construction, EV-readiness, low-VOC materials).
Carbon Monoxide Detectors
Where CO detectors are required (typically near sleeping areas in homes with fuel-burning appliances or attached garages), and seller/landlord deadlines.
Ada County
Some RestrictionsNew homes in unincorporated Ada County with an attached garage or any fuel-fired appliance must have an approved carbon…
Read full rule →Caldwell
Some RestrictionsCaldwell requires carbon monoxide alarms whenever permitted work occurs in an existing dwelling with an attached garage…
Read full rule →Meridian
Some RestrictionsMeridian requires carbon monoxide alarms outside sleeping areas in new homes with fuel-fired appliances or attached…
Read full rule →Building Permits
When a building permit is required, new work, renovations, reroofing, decks, the small-project exemptions, and what unpermitted work costs when it surfaces at sale or inspection.
Ada County
Some RestrictionsAny Ada County property owner who wants to build, enlarge, alter, repair, move, demolish or change the occupancy of a…
Read full rule →Boise
Some RestrictionsA building permit is required for most Boise home renovations that touch walls, framing, egress, or systems, not just…
Read full rule →Bonneville County
Some RestrictionsAny construction valued at $100 or more in unincorporated Bonneville County needs a permit from the Zoning…
Read full rule →Caldwell
Some RestrictionsIn Caldwell, no one may begin constructing, altering, repairing, removing or occupying a structure until the building…
Read full rule →Canyon County
Some RestrictionsUnincorporated Canyon County requires a building permit from the Development Services Department before anyone erects…
Read full rule →Idaho Falls
Some RestrictionsIdaho Falls adopts the 2018 International Building Code as its official building code, so covered construction…
Read full rule →Meridian
Some RestrictionsMeridian adopts the 2018 International Building Code citywide and requires a permit for construction work, except…
Read full rule →Nampa
Some RestrictionsNampa requires a building permit to erect any deck, patio structure, or other structure under its general permit law…
Read full rule →Electrical Permits
Which electrical work (panel upgrades, EV chargers, solar inverters, sub-panels) requires a licensed-electrician permit vs. an owner-builder permit.
Boise
Some RestrictionsBoise requires a permit before installing, altering, or repairing most electrical systems, under the city's adopted…
Read full rule →Bonneville County
Some RestrictionsBonneville County enforces the 2023 National Electric Code as its official electrical standard under § 150.01(A)(9)…
Read full rule →Caldwell
Some RestrictionsCaldwell adopts the current National Electrical Code for all electrical installations, alterations and repairs in the…
Read full rule →Idaho Falls
Some RestrictionsElectrical work in Idaho Falls must comply with the National Electrical Code, adopted by the City as the same edition…
Read full rule →Kootenai County
Some RestrictionsKootenai County adopts the 2018 International Building and Residential Codes but expressly excludes the NEC Electrical…
Read full rule →Meridian
Some RestrictionsMeridian requires a city permit before any electrical wiring, fixture, or apparatus work, under the 2017 NEC as locally…
Read full rule →Nampa
Some RestrictionsNampa requires an electrical permit from the building department before any wiring installation or equipment change…
Read full rule →Plumbing Permits
Which plumbing work (water heaters, sewer-line replacement, repipe, gas-line) requires a permit, and which minor repairs are typically exempt.
Boise
Some RestrictionsBoise requires a permit before any plumbing, gas, or drainage piping work, fixture, or water heater installation begins…
Read full rule →Bonneville County
Some RestrictionsBonneville County enforces the 2017 Idaho State Plumbing Code as its official plumbing standard under § 150.01(A)(10)…
Read full rule →Caldwell
Some RestrictionsCaldwell enforces the Idaho State Plumbing Code for every plumbing installation, alteration and repair inside city…
Read full rule →Idaho Falls
Some RestrictionsIdaho Falls adopts the 2017 Idaho State Plumbing Code as its official plumbing code, with local amendments, so new…
Read full rule →Meridian
Some RestrictionsMeridian adopts the 2017 Idaho State Plumbing Code and requires a city permit stating the work, cost, and address…
Read full rule →Nampa
Some RestrictionsNampa requires a plumbing permit from the building department for all piping and drainage installation, with exceptions…
Read full rule →Building Inspections
Required inspection types (rough framing, electrical, plumbing, final), how to schedule, what inspectors look for, and how to handle a failed inspection.
Ada County
Some RestrictionsA building permit in unincorporated Ada County stays alive for three years from issuance. If the work isn't finished…
Read full rule →Boise
Some RestrictionsBoise's building code sets a fixed sequence of inspections, footing, framing, slab, energy, and final, before…
Read full rule →Caldwell
Some RestrictionsCaldwell's building official can enter any site under active construction at any reasonable hour to inspect the work…
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