PermitBasepermitbase.app
Accessory Dwelling Unit (ADU) Permit — Gillette, Wyoming · Requirements sheet
Verified 2026-07-16 · Source: https://online.encodeplus.com/regs/gillette-wy-rewrite/doc-viewer.aspx?secid=393
PermitBase is an independent reference and is not affiliated with any government agency. Requirements change and vary by project — confirm current details with the building department before you submit.
Accessory Dwelling Unit (ADU) Permit in Gillette, Wyoming
Gillette's Adopted Zoning Ordinance (Ord. No. 4056, 12/17/2024) has NO dedicated 'Accessory Dwelling Unit' zoning category, definition, or standalone permit type. A full-text search of the current ordinance (SECTION 11. Definitions and all District Standards sections, via online.encodeplus.com/regs/gillette-wy-rewrite) returns only 'Accessory Structure' and 'Accessory Use' as defined terms — there is no ADU-specific use classification, size cap, or parking standard. A secondary living space on a single-family lot is built and permitted under the generic Accessory Structure/Accessory Use standards and the standard residential building permit process for the applicable zoning district (e.g., R-1 Single-Family Residential, R-2 Two-Family Residential).
Verified 2026-07-16 · Source
When you need this permit
- No dedicated ADU zoning category exists in Gillette's Adopted Zoning Ordinance (confirmed via full-text search of the current code, Ord. No. 4056, 12/17/2024)
- A detached or attached secondary structure/living space is evaluated as an 'Accessory Structure' ("a structure located on the same zone lot as the structure containing the primary, permitted use... detached or attached to the primary structure but must be subordinate and customarily incidental to the use of the primary structure") under the applicable residential district's dimensional standards (setbacks, height, lot coverage)
- Construction is permitted under the standard residential building permit process (IRC — live-adopted edition as of 2026-07-16 is 2021, previously 2024) plus separate electrical/plumbing/mechanical permits as applicable
- Contact the City Planning Division ((307) 686-5281 — phone reverified 2026-07-16; the City Planning Division page does not publish a direct department email, only a "Send an E-mail" contact form and the general gillette@gillettewy.gov line, so the previously-cited cityplan@gillettewy.gov is unconfirmed and removed as of this audit) BEFORE applying to confirm which zoning district applies to the property and whether a proposed secondary dwelling/living space is allowed as an accessory use there
- Contact the Building Division ((307) 686-5260) to confirm which building permit types (new construction vs. addition/remodel) apply to the specific project
Required documents
Check off what you have — your progress is saved on this device.
Not ready yet — 0 of 2 required documents checked.
This checker covers one permit. A full project usually triggers several — our checklist will assemble all of them, free →
Fee schedule
Building Permit Fee (accessory structure/detached living space, by resulting square footage)City Code § 5-IV-1(b); no separate ADU fee line exists because no dedicated ADU permit type exists
$30–$150+$0.04/sq ft — same Building Square Feet table as new construction
Electrical / Plumbing / Mechanical permits (as applicable)Charged under the same per-type fee schedules as any other residential construction
See electrical-permit, plumbing-permit, and mechanical-hvac-permit fee tables
Review timeline
Plan reviewTypical estimate — confirm current times with the Gillette building department
~0–10 business days
Inspection process
- 1
Foundation
Footings/foundation before concrete pour, per soils engineer verification
- 2
Framing
Structural framing per applicable district's Accessory Structure setback/height standards
- 3
MEP Rough-In
Mechanical, electrical, plumbing rough-ins before walls closed
- 4
Final
All work complete, ready for occupancy
See the full Gillette inspection guide — scheduling & re-inspection fees →
Tips
- Gillette does not have a dedicated ADU ordinance the way some other Wyoming cities (e.g., Cheyenne) do — there is no ADU-specific size cap, parking rule, or owner-occupancy provision in the current zoning code. This means a secondary dwelling is governed by the general Accessory Structure/Accessory Use rules of whatever residential zoning district the property sits in, which vary district-by-district (compare R-R, R-S, R-1, R-2, R-3, R-4 setback/height tables).
- Always confirm with the City Planning Division before applying — whether a secondary living unit is an allowed 'accessory use' in a given district is a case-by-case zoning determination, not a codified ADU pathway.
- If Gillette adopts a dedicated ADU ordinance in the future, this entry should be updated accordingly — as of the 2026-07-01 verification date, no such ordinance exists.
Frequently asked questions
Gillette requires an accessory dwelling unit (adu) permit for: No dedicated ADU zoning category exists in Gillette's Adopted Zoning Ordinance (confirmed via full-text search of the current code, Ord. No. 4056, 12/17/2024); A detached or attached secondary structure/living space is evaluated as an 'Accessory Structure' ("a structure located on the same zone lot as the structure containing the primary, permitted use... detached or attached to the primary structure but must be subordinate and customarily incidental to the use of the primary structure") under the applicable residential district's dimensional standards (setbacks, height, lot coverage); Construction is permitted under the standard residential building permit process (IRC — live-adopted edition as of 2026-07-16 is 2021, previously 2024) plus separate electrical/plumbing/mechanical permits as applicable; Contact the City Planning Division ((307) 686-5281 — phone reverified 2026-07-16; the City Planning Division page does not publish a direct department email, only a "Send an E-mail" contact form and the general gillette@gillettewy.gov line, so the previously-cited cityplan@gillettewy.gov is unconfirmed and removed as of this audit) BEFORE applying to confirm which zoning district applies to the property and whether a proposed secondary dwelling/living space is allowed as an accessory use there; Contact the Building Division ((307) 686-5260) to confirm which building permit types (new construction vs. addition/remodel) apply to the specific project. If your project isn't listed, confirm with City of Gillette Development Services — Building Division at (307) 686-5260 before starting work.
In Gillette, the published Building Permit Fee (accessory structure/detached living space, by resulting square footage) is: $30–$150+$0.04/sq ft — same Building Square Feet table as new construction. Additional published fees: Electrical / Plumbing / Mechanical permits (as applicable) — See electrical-permit, plumbing-permit, and mechanical-hvac-permit fee tables. These are the jurisdiction's own published figures — see the fee schedule table and source citations on this page.
Plan review for an accessory dwelling unit (adu) permit in Gillette typically runs 0–10 business days. This is an estimate, not a published figure — confirm current review times with City of Gillette Development Services — Building Division at (307) 686-5260.
You'll need: Building Permit Application (via EnerGov Self Service); Site Plan. See the required-documents checklist on this page for details on each.
Gillette requires 4 inspection(s) for an accessory dwelling unit (adu) permit, in order: Foundation, Framing, MEP Rough-In, Final. Schedule each through City of Gillette Development Services — Building Division ((307) 686-5260).
Apply through City of Gillette Development Services — Building Division at City Hall, 201 E. 5th St., 2nd Floor, Gillette, WY 82716. Phone: (307) 686-5260, email: Not published on city site — use "Send an E-mail" contact form on the Building Division page or main line gillette@gillettewy.gov. Office hours: Mon–Fri (contact department for current hours); permits/plans/licenses/inspections managed via EnerGov Self Service online portal (registration required). Official information: https://www.gillettewy.gov/Departments/Development-Services/Building-Division.
Gillette, Wyoming has adopted: International Building Code (IBC), 2021 Edition — including Appendix C, adopted by City of Gillette Code Chapter 5, Article I § 5-I-2 (Revised 6-16-2026). CHANGED 2026-07-16 audit: the live § 5-I-2.A text now reads "2021 Edition, including Appendix C" and no longer cites Ord. 4052 (12-17-2024), which had adopted the 2024 IBC edition with Appendices C and H per the source PDF as of the prior 2026-07-01 verification; the 2024-edition adoption no longer appears in the current ordinance text.; International Residential Code (IRC), 2021 Edition — including Appendices AA, AB, AC, AE, AN, AQ, and AW (AW 3D Printed Construction), adopted § 5-I-3 (Revised 6-16-2026). CHANGED 2026-07-16 audit: the live § 5-I-3.A text now reads "2021 Edition" with this different appendix set (previously 2024 Edition, Appendices CA, CB, BA, CE, BB, BM per Ord. 4052, 12-17-2024, which no longer appears in the current ordinance text).; International Plumbing Code (IPC), 2021 Edition — including Appendices B, D, E, adopted § 5-I-4 (Revised 6-16-2026) — NOTE: Gillette uses the IPC, not the Uniform Plumbing Code. CHANGED 2026-07-16 audit: edition now reads 2021 (previously 2024 per Ord. 4052, 12-17-2024, no longer cited); appendices B, D, E unchanged.; International Mechanical Code (IMC), 2021 Edition — adopted § 5-I-5 (Revised 6-16-2026). CHANGED 2026-07-16 audit: edition now reads 2021 (previously 2024 per Ord. 4052, 12-17-2024, no longer cited).; National Electrical Code — City Code § 5-I-6 (Revised 6-16-2026) (including Article 80/Annex H). CHANGED 2026-07-16 audit: the live § 5-I-6.A paragraph now contains two different edition references in the same sentence — "...adopted by reference the National Electrical Code, 2023 Edition..." and later "...of the National Electrical Code, 2026 Edition, including Article 80, are hereby referred to, adopted..." — with the amendment history newly listing Ord. 4081 (6-16-2026) as the latest ordinance for this section. The ordinance's own text does not reconcile the two edition years; previously cited cleanly as 2023 Edition only.; International Fuel Gas Code (IFGC), 2021 Edition — including Appendices A, B, C, D, adopted § 5-I-7 (Revised 6-16-2026). CHANGED 2026-07-16 audit: edition now reads 2021 (previously 2024 per Ord. 4052, 12-17-2024, no longer cited); appendices A, B, C, D unchanged.; International Fire Code (IFC), 2021 Edition — including Appendices B, C, D, E, F, and G, adopted § 5-I-8 (Revised 6-16-2026). CHANGED 2026-07-16 audit: edition now reads 2021 and Appendices H and I are absent (previously 2024 Edition with Appendices B–I per Ord. 4052, 12-17-2024, no longer cited).; International Existing Building Code (IEBC), 2021 Edition — adopted § 5-I-9 (Revised 6-16-2026). CHANGED 2026-07-16 audit: § 5-I-9.A reads "2021 Edition" (previously cited as 2024 Edition; the current text carries no ordinance citation for the edition line).; Uniform Code for the Abatement of Dangerous Buildings, 1997 Edition — adopted § 5-I-10 (Revised 6-16-2026); edition unchanged, only the chapter revision date-stamp updated at the 2026-07-16 audit.. Local amendments apply — see the Gillette overview page for the full list.
No. As of the 2026-07-01 verification date, Gillette's Adopted Zoning Ordinance (Ord. No. 4056, 12/17/2024) has no dedicated ADU zoning category, definition, or permit type. A secondary dwelling/living space is instead evaluated under the general 'Accessory Structure' and 'Accessory Use' standards of the applicable residential zoning district. Contact the City Planning Division at (307) 686-5281 to confirm what's allowed on a specific property.
Sources & verification
Verified against official sources. Last reviewed 2026-07-16.
Fees, timelines, and adopted codes are researched from each jurisdiction's published records — see how we verify. Requirements change and vary by project, so always confirm the current details with the Gillette building department before you submit. PermitBase is an independent reference and is not affiliated with any government agency.
Other permits in Gillette
Residential Building Permit (New Construction)Residential Addition / Remodel PermitElectrical PermitPlumbing PermitMechanical / HVAC PermitRoofing Permit (Reroof)Solar PV PermitDemolition PermitCommercial Tenant Improvement / Commercial Building PermitEV Charger / EVSE PermitDeck PermitBasement Finish PermitSign PermitFire Sprinkler System PermitFire Alarm System PermitCertificate of Occupancy / Change of Use
Accessory Dwelling Unit (ADU) Permit in other cities
Compare accessory dwelling unit (adu) permit fees across Wyoming →
Look up this fee in a different city →
Related guides
Now live
Build your Gillette project checklist
Describe your project once and get every permit, document, and fee it triggers in Gillette — in one checklist. Sign up and pay once to generate it, or go unlimited with Pro.
Get started →