Washoe County planner outlines ADU rule changes for Tahoe Basin; residents voice evacuation, parking concerns

Kat Oakley, Washoe County’s long‑range planning manager, briefed the CAB on recent changes to accessory dwelling unit rules for the Tahoe Basin, saying the county removed the previous one‑acre minimum lot size for ADUs in Incline Village and Crystal Bay and set new size and setback limits designed to expand eligibility while preserving site review.

Oakley said permitting remains an administrative review permit — a discretionary planning step that occurs before the building permit and allows the county to solicit comments from agencies such as the fire district. ‘‘The permitting requirements remain the same. It is a discretionary permit,’’ Oakley said, adding that the county can approve or deny and impose conditions of approval.

Why it matters: The rule change could let more property owners add ADUs and increase local housing supply, but neighbors and board members pressed Oakley on safety, coverage and neighborhood impacts that may accompany added units.

Key details from the presentation: the county eliminated minimum lot size for ADUs in Incline Village and Crystal Bay; for lots over 1 acre the maximum ADU size remains the smaller of 50% of the main dwelling or 1,500 square feet; for lots under 1 acre the county set a 1,200‑square‑foot maximum. Oakley also described alternate setbacks for small ADUs (under 500 square feet and 12 feet high) allowing 5‑foot side and rear yards. Parking rules require one off‑street paved space for an ADU; a single‑family main dwelling must continue to provide two off‑street spaces, meaning a parcel with a main house plus an ADU would generally need three off‑street spaces.

Oakley said ADUs still require TRPA approval for coverage and a residential allocation or a TRPA bonus unit. ‘‘Accessory dwelling units do require a residential allocation or a residential bonus unit like any dwelling unit would,’’ she said, and added that Washoe County currently has 251 residential and bonus units remaining in its pool.

On activity so far, Oakley said demand has been limited: historically the county saw 0 ADU applications in 2023, 1 in 2024 and 2 in 2025, and since the December code update she reported one ADU applied for on roughly a 0.8‑acre parcel — a project that previously would not have been allowed. Oakley noted the update is recent and that application counts may rise as property owners learn of the change.

Board and public concerns focused on evacuation and cumulative impacts. CAB members and residents asked how the county would avoid concentrating ADUs in neighborhoods with constrained access and limited evacuation routes, citing Upper Tyner as an example of a street with heavy existing housing and single exit access. Oakley said the retained discretionary (administrative review) step exists to permit site‑specific consideration of access and public‑safety findings: ‘‘We maintain the administrative review process because it allows for a site specific review,’’ she said.

Residents also raised questions about TRPA limits and coverage calculations that may still prevent ADU construction on many parcels. Oakley recommended that potential applicants consult TRPA early because TRPA controls coverage and the two approvals generally proceed concurrently.

Several speakers asked how the county will monitor whether ADUs actually provide workforce housing. Oakley said the department is tracking ADU applications and will collect data on bonus‑unit requests and locations; she also said establishing monitoring metrics is in her work plan for the year.

What happens next: ADU permits will continue to be processed through the administrative review path, subject to interagency comment and possible appeals to the appropriate board. Oakley encouraged residents to consult the county website and District 1 application page for posted applications and resources.

Quote: ‘‘If someone wanted the bonus unit, there are three levels of restrictions under TRPA — affordable (income restricted to 80% of AMI), moderate (120% AMI) and achievable (residency or employment‑based),’’ Oakley said when explaining how deed restrictions interact with bonus units.

The CAB did not take a vote on the ADU code changes during the meeting; Oakley offered to return with updates and said the county will post resources and links to the Tahoe Area Plan and development code online.