ADU Regulations in Wyoming (WY)
Wyoming is rated Moderate for ADU construction with an ADU-friendliness score of 30/100 (Restrictive). Wyoming does not have a statewide ADU law — regulations are set entirely by local jurisdictions. Owner must reside on the property. Additional parking may be required. Wyoming has no statewide ADU law. Jackson (Teton County) has specific ADU provisions driven by extreme housing costs. Other cities have limited ADU regulations. Wyoming's low population density means ADU demand is concentrated in a few areas.
Full ADU Regulations Summary for Wyoming
| ADUs Allowed | Yes |
| Statewide ADU Law | No |
| Maximum ADU Size | Set locally |
| Owner Occupancy Required | Yes |
| Parking Required | Yes |
| Minimum Setback | Set locally |
| Permitting Timeline | Varies by jurisdiction |
| Impact Fees | Varies by jurisdiction |
| Long-Term Rental Allowed | Yes |
| Short-Term Rental (Airbnb) Allowed | Yes |
| Ease of Building | Moderate |
ADU Regulations by City in Wyoming
ADU rules can vary by city even within the same state. Without a statewide ADU law, Wyoming cities set their own rules, and policies can differ significantly. Below are ADU details for 3 cities in Wyoming.
Jackson
ADUs allowed and actively encouraged due to severe housing shortages. Teton County has specific ADU programs. Maximum 800 sq ft. Some ADU incentive programs available.
Cheyenne
ADUs permitted in some zones with conditional approval.
Casper
Limited ADU provisions. Some accessory structures may be permitted as dwelling units with approval.
How Wyoming Compares to Other States
Below is a comparison of Wyoming with five states that have similar ADU-friendliness scores. This comparison helps illustrate where Wyoming stands nationally.
| State | Score | Statewide Law | Parking Req? | Owner Occ? | Ease |
|---|---|---|---|---|---|
| Wyoming (WY) | 30 | No | Yes | Yes | Moderate |
| Alabama (AL) | 30 | No | Yes | Yes | Difficult |
| Delaware (DE) | 30 | No | Yes | Yes | Moderate |
| Georgia (GA) | 30 | No | Yes | Yes | Moderate |
| Idaho (ID) | 30 | No | Yes | Yes | Moderate |
| Illinois (IL) | 30 | No | Yes | Yes | Moderate |
Frequently Asked Questions About ADUs in Wyoming
Can I build an ADU in Wyoming?
Yes, ADUs are allowed in Wyoming. However, Wyoming does not have a statewide ADU law, so the specific rules depend on your city or county's zoning code. Some cities are more permissive than others. The ease of building is rated "Moderate" with a friendliness score of 30/100.
Do I need to live on the property to have an ADU in Wyoming?
Yes, Wyoming generally requires owner occupancy — the property owner must live either in the main house or the ADU. This means you cannot rent out both units simultaneously. Note: individual cities may have their own owner-occupancy rules, so check your local zoning.
How big can an ADU be in Wyoming?
Wyoming does not set a statewide maximum ADU size — this is determined by your local jurisdiction. Common local limits range from 600 to 1,200 square feet. Check your city's zoning code for the specific maximum.
How long does it take to get an ADU permit in Wyoming?
The permitting timeline in Wyoming is: Varies by jurisdiction. Without a statewide mandate, permitting timelines depend entirely on your local jurisdiction's review process.
Who decides ADU rules in Wyoming?
Your city or county — Wyoming has no statewide ADU statute, so zoning boards set the rules jurisdiction by jurisdiction. We track 3 Wyoming cities above (including Jackson); if yours isn't listed, the planning or zoning office is the authoritative source.
Check ADU Rules for Your City
Use our ADU regulations lookup tool to find the specific rules for your city in Wyoming, or browse all 50 states to compare ADU regulations across the country.