Residential Building Permit (Single-Family Dwelling, ADU, Model Home, Tiny House) in Unincorporated Coconino County, Arizona

Unincorporated Coconino County requires a residential building permit (single-family dwelling, adu, model home, tiny house) for: Applies to stick-built/modular SFDs, ADUs (see Coconino County Zoning Ordinance for attached/detached/deed-restricted ADU requirements), lot-specific model homes, and tiny houses under IRC Appendix Q — NOT manufactured homes, park models, or factory-built buildings, which use a different permit application; Register and apply online through the Online Permit Applications portal (co-coconino-az.smartgovcommunity.com): My Portal > Apply Online > Building Division > select permit type; All plan submittals must be electronic PDF, properly scaled (typically 1/4" = 1'), unlocked, and correctly rotated before upload — only PDF format is accepted; Ten working days from submittal date to provide a complete plan set meeting minimum plan requirements, or the application is canceled and must be resubmitted; A geotechnical (soils) report is recommended before plan submittal for new structures; may be required during inspection if not provided upfront; Pay the applicable Plan Review Deposit (Table I) at submittal; it is credited against the total fee due at permit issuance; Coordination with other County divisions may be required as applicable: Planning and Zoning (Conditional Use Permit, Administrative Adjustment), Environmental Quality (wastewater/septic or proof of sewer availability), and Engineering (right-of-way, grading, drainage, floodplain); New construction/additions/alterations of 3,000 sq ft or more require an architect's stamp (single-family dwellings excepted); other conditions (tall walls, deep fill, log construction, structural steel, long-span masonry lintels, expansive clay soils) also require an architect/engineer stamp; HOA CC&Rs are not part of county review — applicants are solely responsible for HOA compliance and approval. If your project isn't listed, confirm with Coconino County Community Development Department, Building and Safety Division at 928-679-8850 (toll-free 800-559-9289); fax 928-679-8851 before starting work.

In Unincorporated Coconino County, the published Plan Review Deposit — New Single-Family Dwelling, Townhouse and Condominium (by size) is: Tiered by square footage (up to 1,000 sq ft; 1,000-2,500 sq ft; 2,500-5,000 sq ft; over 5,000 sq ft); collected at submittal and credited against the total fee due at issuance. Additional published fees: Building Permit Fee — valuation-based (Table II, ICC Building Valuation Data, or Table III, National Construction Estimator) — Table II: building gross area × Square Foot Construction Cost (by occupancy group/construction type per 2018 IBC) × 0.010 permit fee multiplier. Table III valuation bands: $79.00 for the first $500 (plus $4.24 per additional $100) to $2,000; $142.68 for the first $2,000 (plus $28.00 per additional $1,000) to $25,000; $786.85 for the first $25,000 (plus $20.19 per additional $1,000) to $50,000; $1,291.77 for the first $50,000 (plus $13.98 per additional $1,000) to $100,000; $1,991.17 for the first $100,000 (plus $11.20 per additional $1,000) to $500,000; $6,471.49 for the first $500,000 (plus $9.49 per additional $1,000) to $1,000,000; $10,787.59 plus $6.03 per additional $1,000 above $1,000,000; Plan Review Fee — 65% of the calculated Building Permit Fee. These are the jurisdiction's own published figures — see the fee schedule table and source citations on this page.

Per Community Development Substantive Policy 2025-01 (effective 4/28/25, updated 5/29/26), the formal governing target is 36 days total (15 business days intake + 21 calendar days substantive review) for Residential Building and Engineering permits, under authority of A.R.S. § 11-1605. However, the department's current public notice states that due to staffing levels and permit volume, actual review is running 6 to 8 weeks (42-56 days). Source: https://www.coconino.az.gov/DocumentCenter/View/67482/Permit-Review-Dept-Policy and https://www.coconino.az.gov/136/Community-Development

You'll need: BD-RES-SFD-or-ADU Submittal Requirements (Information Sheet); Sample Site Plan. Depending on your project, Unincorporated Coconino County may also ask for: ADU and Tiny House Matrix; Log Home Specifications. See the required-documents checklist on this page for details on each.

Unincorporated Coconino County requires 4 inspection(s) for a residential building permit (single-family dwelling, adu, model home, tiny house), in order: Foundation/Footing, Framing, Insulation, Final. Schedule each through Coconino County Community Development Department, Building and Safety Division (928-679-8850 (toll-free 800-559-9289); fax 928-679-8851).

Apply through Coconino County Community Development Department, Building and Safety Division at 2500 N. Fort Valley Road, Building 1, Flagstaff, AZ 86001-1287. Phone: 928-679-8850 (toll-free 800-559-9289); fax 928-679-8851, email: plansubmittals@coconino.az.gov. Office hours: Monday-Friday, 8:00 a.m.-5:00 p.m. Director: Jay Christelman; Assistant Director: Jess McNeely. All building permit applications and document submittals for unincorporated Coconino County are made online through the Online Permit Applications portal (co-coconino-az.smartgovcommunity.com); only PDF files are accepted for plan review submittals.. Official information: https://www.coconino.az.gov/624/Building-and-Safety.

Unincorporated Coconino County, Arizona has adopted: Arizona has NO statewide mandatory building code floor for general construction — code adoption is a per-city/county authority under state enabling statutes (A.R.S. Title 11 for counties). Coconino County Community Development Department, Building and Safety Division, is the code enforcement agency and building official for all unincorporated areas of the county (areas outside Flagstaff, Page, Fredonia, Tusayan, and Williams, and outside the Coconino County portion of Sedona).; As of this record's verification date (July 2026), the Coconino County Building Division's current adopted codes are: 2018 International Residential Code (IRC); 2018 International Building Code (IBC); 2018 International Mechanical Code (IMC); 2018 International Fuel Gas Code (IFGC); 2018 International Plumbing Code (IPC); 2018 International Energy Conservation Code (IECC); 2018 International Existing Building Code (IEBC); and 2017 National Electrical Code (NEC). Adopted via County Ordinance 2019-10 ('2019-10 Coconino County Building Ordinance — adopting the 2018 Suite of Building Codes with Amendments'). Source: Coconino County Building Codes, Ordinances, Design Criteria page (coconino.az.gov/2391/Building-Codes-Ordinances-Design-Criteri), 'Current Codes and Ordinances' section, rendered/read directly July 2026.; Every six years the Community Development Department, in partnership with the Building Safety Advisory Board (BSAB), leads a process to adopt updated codes. As of this record's date, the County has begun a public process toward adopting the 2024 ICC code suite and 2023 NEC — an open house was held March 23, 2026 at 2500 N. Fort Valley Rd. (Thomas Auditorium), and a slide deck covering the 2024 IECC, IBC, IPC, IMC, IFGC and 2023 NEC changes was presented — but as of this record's lastVerified date that update had NOT yet been formally adopted. The 2018 ICC / 2017 NEC baseline remains the current, controlling code. Source: Coconino County Building Codes, Ordinances, Design Criteria page, 'Building Code Adoption' section.; Additional adopted county ordinances/codes beyond the base ICC/NEC suite: Potable Rainwater Collection and Distribution Systems Code (an amendment to the IRC); 2020-11 Earthen Building and Construction Ordinance (regulating quality, type of material, testing, and workmanship for earthen buildings/structures). Source: Coconino County Building Codes, Ordinances, Design Criteria page.; The Innovative Materials and Systems Pilot Program (part of the 2019-10 Ordinance) allows owner-builders to seek an exemption from standard adopted-code provisions when building with alternative methods and materials, under conditions evaluated by the Building Official — administered in coordination with the County's broader 'Building with Alternative Methods and Materials' / Alternative Methods and Materials Permit Program (ATAG certification and consultation process) run out of the Community Development Department. Source: Coconino County Building Codes, Ordinances, Design Criteria page; Coconino County Community Development page (coconino.az.gov/136/Community-Development), 'Building with Alternative Methods and Materials' section.; Manufactured homes and factory-built buildings follow a joint state/local structure: the Arizona Department of Fire, Building and Life Safety (Office of Manufactured Housing) sets manufacturer/installer/retailer licensing and issues state-level installation permits, while local site/foundation/utility compliance is handled by Coconino County under a dedicated Manufactured Homes and Factory Built Building Permit fee schedule (Part III of the county's Building Permitting Fees) and a 7-business-day review ceiling under the county's own timeframes policy. Source: Coconino County Online Permit Applications page (coconino.az.gov/2390/Online-Permit-Applications), 'Manufactured Homes & Factory Built Projects' section; Coconino County Building Permitting Fees schedule, Part III.; Properties within the Sedona Fire District (including Oak Creek Canyon) are additionally subject to the 2018 Wildland and Urban Interface Codes as adopted by that fire district; fire suppression systems are required in addition to Wildland-Urban-Interface-code compliance, and the Sedona Fire Marshal conducts concurrent plan reviews with Coconino County to ensure compliance. Source: Coconino County Building Codes, Ordinances, Design Criteria page, 'Building Within the Sedona Fire District' section.. Local amendments apply — see the Unincorporated Coconino County overview page for the full list.

Yes. The Coconino County Community Development Department, Building and Safety Division, is the county's own in-house building department, administering and enforcing the 2018 ICC code suite and 2017 NEC (with local amendments) for all unincorporated areas of the county. Apply online at co-coconino-az.smartgovcommunity.com. Source: https://www.coconino.az.gov/624/Building-and-Safety