Residential Addition / Remodel Permit in Willcox, Arizona

Yes, a building permit is required for room additions and remodels affecting structural, electrical, mechanical, plumbing, or fire-safety conditions. Ordinary repairs under $1,000 in valuation that replace only component parts without changing those conditions are exempt under IRC § R105.2.2.1 as adopted by the City.

In Willcox, the published Construction Fee — Based on Valuation (Table 1) is: Same valuation table as new residential construction ($23.50 at $1-$500 scaling to $5,608.75 + $3.75 per additional $1,000 above $1,000,000). Additional published fees: Plan Review Fee — 65% of the Construction Fee; Plumbing / Mechanical / Electrical Fee (as applicable to scope) — 25% of the Construction Fee each, minimum $30.00 each. These are the jurisdiction's own published figures — see the fee schedule table and source citations on this page.

Willcox's published plan-review target for a residential addition / remodel permit is 4–20 business days.

You'll need: Building Permit Application (Online, iWorQ Portal); Site Plan / Construction Plans. See the required-documents checklist on this page for details on each.

Willcox requires 4 inspection(s) for a residential addition / remodel permit, in order: Footings / Stem Wall / Underground Plumbing & Electric, Sheathing & Framing, Pre-Drywall, 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.