PERCH · ADU LEGALITY INDEX · UPDATED 2026-07-17

ADU Laws in Wyoming — 2026 Guide

Statute summary, size caps, owner-occupancy rules, permit timelines, and a 4-question eligibility quiz. Part of the PERCH ADU Legality Index — one page per state, verified against real statute references and updated as laws change.

4-question eligibility quiz

Q1 · State
What state are you building in?
Q2 · Lot size
How big is the lot?
Q3 · Zoning
What zoning district is the lot in?
Q4 · Property type
Which best describes the build?
Result

Key rules · Wyoming

Statute summaryWyoming has no statewide ADU statute. Cheyenne and Jackson permit ADUs with conditional-use permits; Casper permits under form-based code.
ADU allowedConditional — depends on jurisdiction
Size cap (sqft)900
Owner-occupancy requiredNo
Permit timeline (days)45-115
Statute citationW.S. § 15-1-601 (Local Zoning)
Last verified2026-07-17

Frequently Asked Questions

Are ADUs legal in Wyoming?
Conditionally — ADU legality in Wyoming depends on the specific municipality. Consult your local planning department; Wyoming has no statewide ADU statute. Cheyenne and Jackson permit ADUs with conditional-use permits; Casper permits under form-based code.
What are the size limits on an ADU in Wyoming?
Wyoming permits ADUs up to approximately 900 square feet per W.S. § 15-1-601 (Local Zoning). Individual municipalities may set lower caps; verify with your city or county planning department before ordering.
Do I need a permit for an ADU in Wyoming?
Yes — every ADU in Wyoming requires a building permit issued by the city or county. The permit process typically runs 45-115 days depending on jurisdiction, complexity, and whether discretionary review is triggered.
Can I rent out my ADU in Wyoming?
Long-term rental is generally permitted in Wyoming where the ADU itself is legal. Short-term rental (under 30 days) is subject to municipal registration and may require additional permits; check with your local planning department.
Does Wyoming require owner-occupancy on the primary residence when I have an ADU?
No — Wyoming does not require owner-occupancy under state statute per W.S. § 15-1-601 (Local Zoning). Local ordinances may still add owner-occupancy requirements in specific cities.
What zoning districts allow ADUs in Wyoming?
Most Wyoming municipalities permit ADUs in single-family residential zones (R-1, R-2 equivalent). Wyoming has no statewide ADU statute. Cheyenne and Jackson permit ADUs with conditional-use permits; Casper permits under form-based code. Consult your city zoning code for the specific district table.
How long does an ADU permit take in Wyoming?
Typical ADU permit timelines in Wyoming run 45-115 days from application to approval. Fast-permitting counties can move in under 30 days; metro-core jurisdictions with discretionary review can extend to 150+ days.
Are there setback requirements for an ADU in Wyoming?
Yes — most Wyoming municipalities apply the same setback requirements to ADUs that apply to the primary structure (typically 5-10 feet rear and side, 15-25 feet front). Some cities apply reduced setbacks specifically for detached ADUs. Verify with your city zoning code.
Can I finance an ADU purchase in Wyoming?
Yes — several financing pathways cover ADU purchases in Wyoming: Fannie Mae HomeStyle Renovation, FHA 203(k), construction-to-perm loans, HELOC on the primary residence, and cash. Check with modular-friendly lenders like 21st Mortgage, Cascade Financial, and Triad Financial for the Wyoming-specific product.
What's the difference between an ADU and a JADU in Wyoming?
The JADU (Junior ADU) category originated in California and is not a distinct legal category in Wyoming. Most Wyoming municipalities regulate internal conversions and detached units under a single ADU/accessory apartment definition.

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