Cheyenne ADU permit requirements
Last reviewed: June 22, 2026
Quick answer
Permitting an accessory dwelling unit (ADU) in Cheyenne, Wyoming means pulling a building permit from the local authority that issues it. ArchPermit tracks 11 source-cited requirements (9 required, the rest conditional) for this jurisdiction. Submittals go through Cheyenne OpenGov permitting portal. These requirements were last reviewed June 22, 2026; confirm the exact forms and fees with the local permitting authority.
A source-cited checklist of what an ADU (accessory dwelling unit) permit package needs in City of Cheyenne. Every item links to its authoritative source; items that vary are flagged to confirm locally.
An ADU is NOT purely by-right — in UDC Table 5-1 'Accessory Dwelling' is coded 'A' = a use permitted after Administrative Review in residential districts (AG, AR, RR, LR, MR, HR, NR-1/2/3, MUR, MUB; 'P' in PUD), and is not allowed in commercial/industrial/public districts. So before any building permit, the use must clear the Administrative Use Approval process (UDC § 2.2.5): a mandatory pre-application meeting, a formal application, posted notice (1 sign per road frontage for ≥7 days), and a Director decision. One ADU per detached one-unit dwelling lot; ≤40% of the principal dwelling up to 1,200 sf (basement apartments exempt). A Feb 9 2026 amendment (PLTA-25-10) reportedly repealed owner-occupancy and adjusted parking, but the consolidated UDC PDF (dated 2026-02-24) still shows the 'Notice of ADU Regulations' recording and the +1 parking space — confirm the final adopted § 5.7.3 text.
- Additional Off-Street Parking Spacerequiredverify locally
§ 5.7.3(h): one parking space in addition to that required for the principal dwelling (the Feb 2026 amendment reportedly adjusted this — verify the final adopted wording).
source · reviewed 2026-06-22 - Administrative Use Approval (Planning)required
ADU is a 'use permitted after administrative review' — a mandatory pre-application meeting, formal application, posted notice (1 sign/frontage, 7 days), and Director decision, which must precede the building permit.
source · reviewed 2026-06-22 - Building Plans (construction set)required
One complete digital set of building plans (copyrighted plans need a red-stamp or duplication-permission letter).
source · reviewed 2026-06-22 - Energy Code (IECC) Compliance Calculationsrequired
RESCheck (or equivalent) demonstrating 2018 IECC compliance, via the prescriptive or performance path.
source · reviewed 2026-06-22 - Plot Planrequired
To scale (min 1"=30'); title block, north arrow, property dimensions, easements, existing buildings with setbacks, proposed location/dimensions, driveway/curb cut, flood hazard area, and impervious-area table.
source · reviewed 2026-06-22 - Residential Building Permit Applicationrequired
City form: valuation, job address, legal description, use zone, owner/agent, contractor + license #, subcontractors, occupancy, construction type, energy-code path, signed certification.
source · reviewed 2026-06-22 - Site / Drainage Planrequired
One digital set stamped/signed by a WY P.E. or land surveyor; drainage pattern with arrows, pervious/impervious table with % coverage, and conformance to the subdivision grading/drainage plan.
source · reviewed 2026-06-22 - Site-Specific Foundation / Footing Plansrequired
One digital set referencing the legal description/address, stamped/dated/signed by a Wyoming registered engineer or architect of record.
source · reviewed 2026-06-22 - Subcontractor / Contractor Licensingrequired
All contractors and subs must be licensed per the City of Cheyenne Contractor Licensing Regulations.
source · reviewed 2026-06-22 - 'Notice of ADU Regulations' Recording (Laramie County)conditionalverify locally
Older § 5.7.3(c) requires recording a 'Notice of ADU Regulations' with Laramie County after Director approval; may have been removed by the Feb 2026 amendment — verify.
source · reviewed 2026-06-22 - Homeowner-as-Contractor Affidavitconditional
Required only if the owner acts as their own contractor; notarized, attesting owner-occupied and not for rental/resale for 3 years (so it doesn't fit a rental ADU).
source · reviewed 2026-06-22