Accessory Dwelling Unit (ADU) Permit in Hayden, Idaho

Hayden requires an accessory dwelling unit (adu) permit for: ADU floor area capped at 1,000 sq ft; if within the same structure as the principal dwelling and exceeding 1,000 sq ft, the structure is instead classified as a duplex and is only allowed per the underlying zone's duplex regulations, not the ADU standard; No new or separate driveway approach permitted from a public or private road — the ADU must use the existing driveway serving the principal dwelling (or the existing structure being converted); Access to the ADU must be a minimum of 12 feet wide with a minimum unobstructed height of 13.5 feet to accommodate emergency service vehicles; if the ADU is located more than 150 feet from a public or private road, a turnaround meeting Northern Lakes Fire Protection District and City Engineer requirements is required; ADU setbacks: minimum 30 feet from the front property line, minimum 10 feet from side and rear property lines (stricter than the general accessory-building setbacks in the underlying zone); The ADU may be attached to the principal dwelling, a stand-alone structure, or built within an accessory structure, but must have an entrance separate from the principal dwelling's entrance; The ADU is treated as a separate single-family dwelling for sewer usage and capitalization-fee purposes, but must connect to the same water and sewer utilities as the principal residence; Reviewed as a Building Permit through the standard bsaonline.com/?uid=2689 application, subject to the same 2018 IRC, IECC, and Design Criteria as any residential structure. If your project isn't listed, confirm with City of Hayden Community Development Department, Building Division at (208) 209-2025 (Building Division); (208) 209-2022 also published on department handouts before starting work.

In Hayden, the published Building Permit Fee — valuation-based (same Building Permit Fee Calculation Table as other residential structures) is: $50.00 minimum ($1.00-$2,000 valuation tier), scaling per the City of Hayden Fee Schedule. Additional published fees: Plan Check Fee (residential, non-refundable) — 10% of the Building Permit Fee, $25.00 minimum. These are the jurisdiction's own published figures — see the fee schedule table and source citations on this page.

Hayden's published plan-review target for an accessory dwelling unit (adu) permit is 22–22 business days.

You'll need: Building Permit Application; Site Plan. See the required-documents checklist on this page for details on each.

Hayden requires 3 inspection(s) for an accessory dwelling unit (adu) permit, in order: Foundation/Footing, Framing, Final. Schedule each through City of Hayden Community Development Department, Building Division ((208) 209-2025 (Building Division); (208) 209-2022 also published on department handouts).

Apply through City of Hayden Community Development Department, Building Division at 8930 N Government Way, Hayden, ID 83835. Phone: (208) 209-2025 (Building Division); (208) 209-2022 also published on department handouts, email: permits@cityofhaydenid.us. Office hours: Not published on the Building Department page or in the Residential Permit Application Instructions as a discrete office-hours line; standard City Hall hours apply. Applications are submitted electronically through the BS&A Online portal (bsaonline.com/?uid=2689), not primarily in person.. Official information: https://www.haydenid.gov/departments/building/index.php.

Hayden, Idaho has adopted: Idaho has a mandatory statewide baseline building code under the Idaho Building Code Act (Idaho Code Title 39, Chapter 41). The City of Hayden is an INCORPORATED CITY within Kootenai County with its own separate Building Department, entirely distinct from Kootenai County Community Development's Building Division (which administers only the unincorporated area of the county). Kootenai County's own adopted-codes documentation explicitly lists Hayden among the incorporated cities in the county with their own building departments and codes. Source: Kootenai County Code Title 7, Chapter 1, Section 7.1.103 (Applicability), https://codelibrary.amlegal.com/codes/kootenaicountyid/latest/kootenaicounty_id/0-0-0-2406; City of Hayden adopted codes, in effect as of January 1, 2021 (City Code, Title 9, Building Regulations): 2018 International Building Code (IBC), 2018 International Existing Building Code (IEBC), 2018 International Residential Code (IRC), 2018 International Mechanical Code (IMC), 2018 International Fuel/Gas Code (IFGC), 2018 International Energy Conservation Code (IECC), 2018 International Fire Code (IFC), 2015 International Swimming Pool and Spa Code (ISPSC), 2009 ICC A117.1 Accessible and Usable Buildings and Facilities, and the Idaho Manufactured Home Installation Standard (State of Idaho Division of Building Safety, 1-2018). Source: City of Hayden Building Department Design Criteria handout, https://cms2.revize.com/revize/hayden/document_center/Government/CED/Building/Frequently%20Asked%20Questions/BuildingDepartmentDesignCriteria.pdf; Plumbing, sewer, and electrical permitting and inspection within Hayden city limits are handled by the STATE of Idaho (Division of Building Safety / DOPL), NOT the City of Hayden — the City's own Residential Permit Application Instructions expressly direct applicants to 'Contact the State of Idaho, Division of Building Safety at (800)955-3044 or apply online https://dbs.idaho.gov/' for plumbing, sewer, and electrical permits/inspections, and state that 'State Permits must be final approved prior to scheduling a City Final Inspection.' This differs from neighboring Coeur d'Alene and Post Falls, which each issue their own electrical and plumbing permits directly. Source: City of Hayden Residential Permit Application Instructions, https://cms2.revize.com/revize/hayden/document_center/Government/CED/Building/Residential%20Permits/ResidentialPermitApplicationPacket.pdf; Mechanical/HVAC permits ARE issued directly by the City of Hayden Building Department (not the State), using the City's own itemized Residential Mechanical Worksheet and fee schedule. Source: City of Hayden Residential Mechanical Worksheet (same packet) and City of Hayden Fee Schedule (Exhibit A, eff. 9/1/2023); Building permit applications and construction documents are submitted electronically as PDFs through the BS&A Online portal (bsaonline.com/?uid=2689); the City does not describe an in-person plan drop-off as the primary application method. Source: City of Hayden Residential Permit Application Instructions. Local amendments apply — see the Hayden overview page for the full list.

1,000 square feet. If an ADU within the same structure as the principal dwelling exceeds 1,000 sq ft, the structure is instead classified and regulated as a duplex under the underlying zone's duplex rules. Source: Hayden City Code 11-2-5.