Canyon County Development Services Department - Building Division

Canyon County, Idaho

county

111 N. 11th Ave, Room 310, Caldwell, ID 83605

Required

Required

WHO THIS COUNTER IS FOR. Canyon County's building authority is the unincorporated county. The Development Services Department states plainly that the County has no jurisdiction within city limits and refers anyone with a complaint inside city boundaries to their city government, and the County's own guidance to the agricultural building exemption in its building ordinance is published under the heading UNDERSTANDING THE AGRICULTURAL BUILDING EXEMPTION IN UNINCORPORATED CANYON COUNTY. No list of incorporated cities served by agreement appears on the County's building pages, so before quoting a job confirm from the address which counter it belongs to: inside a city, that city's own building department governs. WHERE THE COUNTY'S COUNTER STOPS AND THE STATE'S BEGINS. Canyon County issues building permits, but since September 1, 2023 the State of Idaho conducts HVAC permitting and inspections for Canyon County, and the County states that with the exception of built-in solid fuel burning appliances such as wood stoves and pellet stoves, all mechanical, electrical and plumbing permits and inspections are handled by the State of Idaho, Division of Occupational and Professional Licenses. A re-roof is a County permit. APPLYING AND INSPECTING: applications are taken by the Development Services Department at 111 North 11th Avenue, Room 310, Caldwell, and online through the County's development services portal. Inspections are scheduled only through the inspection request line on 208-454-7460, open 7 a.m. to 4 p.m. excluding holidays; a request called in is scheduled for the following business day, and the County's inspection policy states that it may take up to two days to complete an inspection and that a permit holder cannot choose a particular inspection time without prior approval from the office. Work that is not ready may incur a re-inspection fee, and the County charges $75.00 for a special inspection or re-inspection. The County's inspectors work remotely and cover large geographical areas, so call the line rather than an individual. Approved plans and engineering must be printed in color and on site for each inspection, and the site address must be posted so it is clearly visible and legible from the street throughout construction. TWO RURAL CONDITIONS THAT CATCH PEOPLE. First, agricultural buildings: Idaho Code 39-4116(5) requires local governments to exempt agricultural buildings from the building code, and the County's own ordinance carries the exemption at section 06-01-09(4), which provides that the article "does not apply to an 'agricultural building' as defined in section 06-01-07 of this article" but that anyone building one "must apply for and obtain a zoning compliance/permit before any construction begins on the property". The County's definition is narrower than the statute's in one respect a roofer should check: the building must sit "on agriculturally zoned land which agriculturally zoned land shall consist of at least a single parcel of land of more than five (5) acres in size", with discretion in the director to allow less. Second, since January 15, 2026 private roads and shared private driveways serving two inhabited structures must be constructed and certified before a building permit is issued.

Not required — Sourced from Canyon County's own climatic and geographic design criteria, not inferred from climate. The County has replaced the model table for itself: it publishes that Section R301.2, "Climatic And Geographic Design Criteria", table R301.2(1) "shall be changed to read as follows", and the table it prints in place of the model one carries "No" in its "Ice Shield Underlaying Required" column. Idaho's state rule does not answer this question either way: IDAPA 24.39.30.600.03 amends nothing in Chapter 9 of the 2018 International Residential Code, and Table R301.2(1) is the one part of Part III that Idaho Code 39-4116(4)(c) leaves a county free to fill in and amend for local conditions. Nothing in the County's entry stops a shingle manufacturer's printed installation instructions, or a particular roof's exposure and history of ice damming, from calling for eave protection anyway. About ice & water barrier

Canyon County's own building ordinance states the permit requirement in the broadest terms and does not carve roofing out of it. Section 06-01-09(1) of the Canyon County Building Code Ordinance: "It shall be unlawful for any person to erect, construct, enlarge, alter, repair, improve, move, remove, convert or demolish any building or structure unless a separate permit for each building or structure has first been obtained from the county development services department." The clause draws no line between a repair and a full replacement and states no square-foot or dollar figure. The County quotes that same clause on its Building Department page, attributed there to Ordinance 15-004 of March 13, 2015. Its current permit fee schedule, effective March 28, 2025, then prices the work by name: "Re-Roof ... $75.00 per inspection", alongside a $75.00 special inspection or re-inspection fee. The two permit exemptions the County publishes on its building pages are the agricultural building exception at section 06-01-09(4) of its own ordinance, and a Building Official Determination signed July 18, 2025 clarifying item 1 of International Residential Code Section R105.2, work exempt from permit, for one-story detached accessory structures whose floor area does not exceed 200 square feet -- which that determination further requires to be separated from the residence and from other accessory structures by no less than three feet. Neither is a roofing exemption. Idaho supplies no backstop behind the County and no default the other way: Idaho Code 39-4111(2) makes it unlawful to build without a permit "in a local government jurisdiction enforcing building codes" and refers the content of that obligation to "the applicable ordinance or ordinances of the local government", so in Canyon County the County's own ordinance is the whole of the answer.

Take these from Canyon County's own table, which the County publishes filled in. The County states that Section R301.2, "Climatic And Geographic Design Criteria", table R301.2(1) "shall be changed to read as follows", and the table it prints in place of the model one reads across its columns: Ground Snow Load 25 psf; Wind Speed (mph) 115, Exposure C; Seismic Design Category B; Weathering Severe; Frost Line Depth 24 inches; Termite Slight to moderate; Decay None to slight; Winter Design Temp 10 degrees F; Ice Shield Underlaying Required No; Flood Hazards CCFHAR 9/19/87; Air Freezing Index 980; Mean Annual Temp 51 degrees F. CHECK THE BASIS BEFORE YOU APPLY THE WIND NUMBER. The County prints 115 under a column headed only Wind Speed (mph) and states no basis for it. A nominal wind speed (the older allowable-stress basis) and an ultimate design wind speed are two different numbers for the same wind loading and are not interchangeable, so confirm which basis your design method, your engineering or your product listing expects before you use the figure. The County adds that the language explaining the lettered footnotes in its table "is included with the table in the international residential code and is incorporated by reference as if fully rewritten herein." One state fact belongs beside these: Idaho deletes the model code's wind-borne debris opening-protection section statewide, IDAPA 24.39.30.600.03(d) reading "Section R301.2.1.2 Protection of Openings. Delete." That is an opening (window and door) provision rather than a roofing one, and under Idaho Code 39-4116(4)(b) a local jurisdiction may not re-adopt a provision the Idaho Building Code Board has expressly rejected.

6.0% -- the Idaho state rate, with no local add-on, and for a county record that is itself the finding: Idaho counties levy no sales tax at all, so nothing is added at the county line. Idaho Code 63-3619 imposes the state sales tax "at the rate of six percent (6%)". Idaho has only two kinds of local sales tax and neither reaches a roof here: a resort-city local-option tax, which is a city authority that Idaho Code 50-1044 confines to resort cities "with a population not in excess of ten thousand (10,000)", and an auditorium-district tax, which the Idaho State Tax Commission states "can charge a local sales tax only for short-term lodging (30 days or less)". HOW A ROOF IS TAXED, which matters more than the rate: the Tax Commission's contractor guidance states that "Idaho sales tax law says contractors are the consumers (end users) of all the goods they use. As a result, they must pay sales tax on all purchases", and it names roofers among the contractors it covers. The roofer pays the 6% on materials at the supply house; the homeowner's invoice carries no sales tax line at all, on materials or on labour, because "a contractor doesn't charge sales tax to the customer" and the tax is absorbed into the bid. The Commission adds: "If sales tax is charged on the bill, the customer can refuse to pay it." A customer's own sales-tax exemption does not carry over to the contractor.