Green River building permits

Verified

Department contacts, adopted codes, permit types, fees, and gotchas for Green River, Wyoming.

Last verified 2026-07-01 · Source

Building department

Address: 50 E 2nd North Street, Green River, WY 82935
Phone: (307) 872-6140
Email: Contact via Development Services (see department website)
Office hours: Monday through Friday, 8:00 a.m. to 5:00 p.m.
Website: Official site

Codes adopted

Wyoming has no statewide-mandated building code for general private construction. Under Wyoming Statute § 35-9-106, the Council on Fire Prevention and Electrical Safety in Buildings adopts minimum fire, building, mechanical, existing-building, and fuel-gas standards (not exceeding the International Codes), but § 35-9-121 makes local enforcement an opt-in delegation: a municipality or county must apply to the State Fire Marshal for local enforcement authority and adopt, by ordinance or resolution, standards equivalent to or more stringent than the state's — otherwise no local building code applies at all. In practice this produces exactly the fragmented picture that describes most of the state: some cities and counties (e.g., Laramie County, Natrona County) have adopted and enforce their own building codes, while many unincorporated county areas genuinely require no building permit for general construction. Electrical is different: under § 35-9-119(a)(i), the Chief Electrical Inspector (Wyoming State Fire Marshal's Office, Department of Fire Prevention and Electrical Safety) enforces the National Electrical Code statewide by default, EXCEPT in localities that have been separately granted their own certified electrical-enforcement authority under § 35-9-121(a) — so electrical permitting may be issued by the state program or by the local jurisdiction depending on which one currently holds delegated authority. Always confirm both the current building-code adoption status (if any) and which entity — state or local — issues the electrical permit with the specific jurisdiction before submitting plans.

2024 International Building Code (IBC), including Appendices B, I, J — adopted by City of Green River Code of Ordinances Sec. 7-16 (Ord. No. 16-02, 8-1-16; amended through Ord. No. 25-01, 1-21-25); Chapter 27 (Electrical) of the IBC is deleted by local amendment since electrical is separately governed by the local NEC adoption (Sec. 7-76)2024 International Residential Code (IRC), including Appendices AA, BA, BE, BF, CA, CB, CD — Sec. 7-17 (Ord. No. 25-01, 1-21-25); local design criteria: Ground Snow Load 30 psf, Wind Speed 115 mph, Seismic Design Category C, Weathering Severe, Frost Line Depth 42 inches, Termite None to Slight, Winter Design Temp -20°F, Ice Shield Underlayment Required, Air Freezing Index 2282, Elevation 6,132 ft2024 International Plumbing Code (IPC), including all appendices — Sec. 7-31 (Ord. No. 25-01, 1-21-25), with local amendment to Section 305.4 (Freezing) restricting exterior/attic/crawlspace pipe placement2024 International Mechanical Code (IMC), including all appendices — Sec. 7-46 (Ord. No. 25-01, 1-21-25)2024 International Fuel Gas Code (IFGC) — Sec. 7-91 (Ord. No. 25-01, 1-21-25)National Electrical Code (NEC), latest edition as adopted by the Wyoming State Fire Marshal's Office (currently the 2023 NEC statewide) — adopted by reference for Green River under Sec. 7-76 (Ord. No. 16-02, 8-1-16; amended through Ord. No. 25-01, 1-21-25); enforced locally by the City under Home Rule, not by the state electrical program

Permit types & fees

Residential Building Permit (New Construction)

Required for new single-family and two-family residential construction in Green River, including duplex dwellings. Governed by the 2024 International Residential Code (IRC) as adopted by Sec. 7-17 of the Code of Ordinances, with Green River-specific climatic and geographic design criteria.

Residential Addition / Remodel Permit

Required for additions, remodels, and interior alterations to existing residential structures in Green River, including square-footage-increasing additions and interior remodeling.

Electrical Permit

Required for electrical wiring, installations, and alterations in Green River. Governed by the National Electrical Code (NEC), latest edition as adopted by the Wyoming State Fire Marshal's Office (currently the 2023 NEC), adopted locally by Code of Ordinances Sec. 7-76. IMPORTANT: unlike the WSFM 'LOCAL AND STATE JURISDICTIONS' chart's general S/S (state-enforced) classification for Green River, the city's OWN ordinance and forms show Green River enforces its electrical code locally under Home Rule — see localAmendments for the full discrepancy note.

Plumbing Permit

Required for plumbing installations, alterations, and repairs in Green River. Governed by the 2024 International Plumbing Code (IPC), adopted by Code of Ordinances Sec. 7-31, with a local amendment restricting exterior/concealed pipe placement due to the area's cold climate.

Mechanical / HVAC Permit

Required for heating, ventilating, cooling, refrigeration, and other mechanical equipment installations in Green River. Governed by the 2024 International Mechanical Code (IMC), adopted by Code of Ordinances Sec. 7-46, and the 2024 International Fuel Gas Code (IFGC) for gas piping, adopted by Sec. 7-91.

Roofing Permit (Reroof)

Required for roofing and reroofing work in Green River per the city's Work Requiring a Building Permit list, governed by the 2024 IBC/IRC as applicable to the structure type.

Solar PV Permit

Rooftop or ground-mounted solar photovoltaic installations in Green River require a building permit (structural) and an electrical permit, since solar PV falls under both the adopted 2024 IRC/IBC (structural/racking) and the locally-enforced NEC (electrical interconnection, Article 690).

Accessory Dwelling Unit (ADU) Permit

Green River's zoning ordinance (Code of Ordinances Appendix B, Chapter 9 — Use Regulations) has NO dedicated Accessory Dwelling Unit (ADU) permit type or zoning category. The zoning code's own definition of 'Accessory Buildings, Structures and Uses' (Section 9.6) explicitly excludes residential occupancy: an accessory use 'Does not include residential occupancy.' A second dwelling unit on a lot must instead be built as a recognized 'Multi-Unit Dwelling' use (permitted only in specific multi-family zoning districts, e.g. R-3/R-4), not as an accessory structure to a single-family home.

Demolition Permit

Required for demolition of structures in Green River. Requires sign-off from electrical utility, gas utility, and water/wastewater/sewer confirming service disconnection before demolition, plus a City Building Department utility-shutoff inspection.

Commercial Tenant Improvement Permit

Required for interior remodels, additions, and tenant improvements to commercial and industrial buildings in Green River. Governed by the 2024 International Building Code (IBC) as adopted by Sec. 7-16, charged at 100% (not the 50% residential rate) of the general valuation fee table. Certain commercial projects require additional State Fire Marshal's office review.

Tips & gotchas

ELECTRICAL DISCREPANCY (read before advising on electrical permits): the WSFM 'LOCAL AND STATE JURISDICTIONS' chart lists Green River's electrical enforcement as S/S (state-enforced). Green River's own Code of Ordinances Sec. 7-76 and its Construction Regulations brochure both state the City enforces electrical under Home Rule, and the City's building permit form has its own 'Master Electrician's License Number' field. This file follows the city's own, more specific, and more recently amended source, per the grounded-extraction rule — but always confirm the live path with Development Services (307-872-6140) for a specific project, since the general chart's classification actively conflicts with the city's own ordinance text.
Green River is the Sweetwater County seat and shares Sweetwater County with the City of Rock Springs. Both are separately incorporated cities with their own Building Divisions — Rock Springs is FULL building/FULL electrical per the WSFM chart, distinct from Green River's building department. Do not conflate the two cities' permit programs or fee schedules.
Green River adopted the 2024 I-Codes package (IBC, IRC, IPC, IMC, IFGC) via Ordinance No. 25-01 (adopted January 21, 2025) — this is a genuinely recent adoption; codified through Ordinance No. 25-02 as of the Municode Supplement 16 update (May 14, 2026).
Green River's IRC design criteria are locally amended and distinctive: Ground Snow Load 30 psf, Wind Speed 115 mph, Seismic Design Category C, Frost Line Depth 42 inches (deep — plan foundations accordingly), Winter Design Temperature -20°F, Ice Shield Underlayment required, elevation 6,132 ft.
No dedicated ADU (Accessory Dwelling Unit) permit or zoning category exists in Green River — confirmed by reading the zoning code's Table of Uses and Accessory Use definitions directly; a second dwelling unit requires Multi-Unit Dwelling zoning (e.g., R-3/R-4), not an ADU pathway.
Building, Plumbing, Electrical, and Mechanical permits in Green River all share ONE general valuation-based fee table (effective July 1, 2018) — residential work at 50% of the table, commercial/multi-family at 100%. There are no separate dedicated flat fees for electrical, plumbing, or mechanical permits alone.
The Development Services Fees schedule on file is dated 'Effective July 1, 2018' — no newer superseding fee schedule was found published on the city's site as of this data's lastVerified date; this is the current live, linked fee schedule.
Some 'what does not require a permit' reference brochures (Docs #4177, #4178) still cite the 2018 I-Codes edition numbering even though the ordinance itself was updated to the 2024 edition on 1/21/25 — the exemption categories are structurally similar between editions but should be read as illustrative, with the current ordinance text controlling.
Certain commercial projects in Green River require additional review by the Wyoming State Fire Marshal's office on top of City review — confirm applicability with the Building Inspector before scoping a commercial project timeline.
Building permit applications are processed by the City of Green River Development Services Building Inspection Division; online applications can also be submitted via MGO Connect (linked from the Forms & Documents page).