Residential Building Permit (New Construction) in Willcox, Arizona

Willcox requires a residential building permit (new construction) for: Building permit required for new single-family and two-family dwelling construction within Willcox city limits (Willcox Municipal Code § 10.01.010, § 10.01.040); Plans must comply with the 2018 IRC and City of Willcox amendments, including Climatic and Geographic Design Criteria (90 mph wind; Seismic Design Category C; 0-inch ground snow load and frost line depth; 15°F winter design temperature; moderate-to-heavy termite potential); New single-family residences on a water-company connection require a pressure-reducing valve (PRV) capped at 60 psi (wells/well-shares exempt); Termite soil pretreatment required beneath any slab foundation by an Arizona Structural Pest Control Commission-licensed applicator prior to the concrete pour; Submittal via the online iWorQ Building Permit Application portal (willcox.portal.iworq.net/WILLCOX/new-permit/600/5244), which requires project address/parcel number, applicant and property-owner information, an A.R.S. Title 32 contractor-licensing/exemption declaration, description of work, and value of work; Construction documents must be uploaded as PDFs per the City's Building Plan Guidelines (site plan, floor plan, elevations, building sections, foundation, framing, structural details, electrical/mechanical/plumbing/gas schematics); a Registered Design Professional stamp is not required for a detached single-family dwelling under A.R.S. § 32-144(A)(3); All contractors must hold a City of Willcox business license before the building permit will be signed; Permit valid 180 days from issuance or last requested inspection; one 180-day extension available for just cause on written request. If your project isn't listed, confirm with City of Willcox Community Development Department — Building Safety Division / Development Services at 520-384-4271 before starting work.

In Willcox, the published Construction Fee — Based on Valuation (Table 1) is: $23.50 ($1-$500 valuation); $23.50 for the first $500 plus $3.00 per additional $100 or fraction to $2,000; $68.50 for the first $2,000 plus $14.00 per additional $1,000 or fraction to $25,000; $390.50 for the first $25,000 plus $10.00 per additional $1,000 to $50,000; $640.50 for the first $50,000 plus $7.00 per additional $1,000 to $100,000; $990.50 for the first $100,000 plus $5.50 per additional $1,000 to $500,000; $3,233.75 for the first $500,000 plus $4.75 per additional $1,000 to $1,000,000; $5,608.75 for the first $1,000,000 plus $3.75 per additional $1,000 above $1,000,000. Additional published fees: Plan Review Fee — 65% of the Construction Fee; Plumbing Fee (component of a full residential building permit) — 25% of the Construction Fee, minimum $30.00; Mechanical Fee (component of a full residential building permit) — 25% of the Construction Fee, minimum $30.00; Electrical Fee (component of a full residential building permit) — 25% of the Construction Fee, minimum $30.00. These are the jurisdiction's own published figures — see the fee schedule table and source citations on this page.

Per the City of Willcox Building Plan Guidelines (updated 02/26/2026), most new residential projects require a 20-business-day review (smaller projects may see an initial 4-business-day review). This is a published figure meeting Arizona's A.R.S. § 9-835 licensing-timeframe posting requirement.

You'll need: Building Permit Application (Online, iWorQ Portal); Construction Plans / Site Plan; Residential Plan Requirements Checklist. Depending on your project, Willcox may also ask for: Truss Calculations / Structural Calculations. See the required-documents checklist on this page for details on each.

Willcox requires 8 inspection(s) for a residential building permit (new construction), in order: Set Back Inspection, Footings / Stem Wall / Underground Plumbing & Electric, Sheathing & Framing, Pre-Drywall, Lath, Drywall Nailing Inspection, Driveway Approach/Apron, Final. Schedule each through City of Willcox Community Development Department — Building Safety Division / Development Services (520-384-4271).

Apply through City of Willcox Community Development Department — Building Safety Division / Development Services at 101 S. Railroad Ave, Suite B, Willcox, AZ 85643. Phone: 520-384-4271, email: permits@willcox.az.gov. Office hours: City Hall general contact: (520) 384-4271. The Building Permit Application itself (submitted via the City's online iWorQ portal, willcox.portal.iworq.net) lists the Development Services Department at 101 S. Railroad Ave, Willcox, AZ 85643, phone (520) 766-4211 — the City's Building Permits page directs the public to (520) 384-4271 for general questions and to schedule inspections, while the online application form itself lists the (520) 766-4211 Development Services line; both numbers are cited here since both appear on the City's own current materials. Applications may be submitted online via the iWorQ Building Permit Application portal (willcox.portal.iworq.net/WILLCOX/new-permit/600/5244) or in person at City Hall/Visitor Center, 101 S. Railroad Ave, Suite B.. Official information: https://willcox.az.gov/building-permits.

Willcox, 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 9). The City of Willcox is a home-rule city that independently adopts and administers its own construction codes through its Community Development Department / Building Safety Division; it does not defer building permitting to Cochise County. Source: Willcox Municipal Code § 10.01.020 (Building inspector) and § 10.01.040 (Adoption by Reference of International Technical Codes), American Legal Publishing code library (current through Ord. NS374, 2026).; 2018 International Building Code (IBC), as amended in Exhibit A to Ordinance NS374, adopted by reference (Willcox Municipal Code § 10.01.040.A). Per the City's Building Permits page, the newly adopted 2018 ICC code suite and 2017 NEC become effective and required for all applicable permit applications submitted on or after April 1, 2026; permit applications submitted before that date remain on the City's prior code cycle. Source: Willcox Municipal Code § 10.01.040; City of Willcox Building Permits page (willcox.az.gov/building-permits); '2018 Building Codes Adoption with Amendments' (Exhibits A-J to Ord. NS374).; 2018 International Residential Code (IRC), as amended in Exhibit B to Ordinance NS374, adopted by reference (§ 10.01.040.B), effective for applications submitted on/after April 1, 2026.; 2018 International Mechanical Code (IMC), as amended in Exhibit C to Ordinance NS374, adopted by reference (§ 10.01.040.C).; 2018 International Plumbing Code (IPC), as amended in Exhibit D to Ordinance NS374, adopted by reference (§ 10.01.040.D), including a locally-inserted Water Conservation Code appendix (see localAmendments).; 2017 National Electrical Code (NEC), as amended in Exhibit E to Ordinance NS374, adopted by reference (§ 10.01.040.E), published by the National Fire Protection Association — one edition behind the 2018 ICC cycle, consistent with standard NFPA/ICC release-cycle offset.; 2018 International Fuel Gas Code (IFGC), as amended in Exhibit F to Ordinance NS374, adopted by reference (§ 10.01.040.F).; 2018 International Fire Code (IFC), as amended in Exhibit G to Ordinance NS374, adopted by reference (§ 10.01.040.G) as the City's uniform fire code, administered by the Building Safety Division under the Community Development Department (fire-code-official references are replaced by 'Building Official' per the City's amendment).; 2018 International Swimming Pool and Spa Code (ISPSC), as amended in Exhibit H to Ordinance NS374, adopted by reference (§ 10.01.040.H); most public/semipublic pool provisions are deleted and replaced with a reference to Arizona Administrative Code Title 18, Chapter 5, Article 2 and A.R.S. § 36-1681.; 2018 International Existing Building Code (IEBC), as amended in Exhibit I to Ordinance NS374, adopted by reference (§ 10.01.040.I).; 1997 Uniform Code for the Abatement of Dangerous Buildings (UCADB), as amended (no amendments) in Exhibit J to Ordinance NS374, adopted by reference (§ 10.01.040.J), published by the International Conference of Building Officials (ICBO).; Uniform Standard Details and Specifications for Public Works Construction, developed by the Maricopa Association of Governments (MAG) and adopted by reference as the City's own public-works construction standard, with 'City of Willcox' substituted for 'Maricopa Association of Governments'/'Maricopa County' throughout (Willcox Municipal Code § 10.01.060; Ord. NS289 § 2, 2008; made public record by Resolution No. 2008-74).; Manufactured homes, mobile homes, and factory-built buildings: construction/installation standards are regulated directly by the State of Arizona (Department of Fire, Building and Life Safety / Office of Manufactured Housing, A.R.S. § 41-4001 et seq.); the City separately charges a $400.00 Manufactured Homes fee and $90.00 Factory Built Buildings fee under its own Development Services Fee Schedule (Table, Other Fees), confirming the City issues its own local placement permit layered on the state process. Source: City of Willcox Development Services Fee Schedule (Resolution No. 2006-10 / 2008-75), Section F.; Whether a Registered Design Professional (architect/engineer per A.R.S. Title 32) is required to prepare and stamp plans is governed entirely by state law, not city ordinance — the City has published a dedicated 'Requirement for Architect or Engineer' guidance document explaining the A.R.S. § 32-144 factors (building size ≤3,000 sq ft, occupant load <21, structural spans ≤20 ft) and giving worked examples; residential (detached single-family) construction is exempt from the RDP requirement under A.R.S. § 32-144(A)(3). Source: City of Willcox 'When is a Registered (Licensed) Architect or Engineer Required for a Building Project' (Community Development Department / Building Safety Division).. Local amendments apply — see the Willcox overview page for the full list.

The 2018 IRC and 2018 IBC (for non-residential portions), plus the 2017 NEC, all as adopted and amended by the City of Willcox via Ordinance NS374, apply to all permit applications submitted on or after April 1, 2026.