Vineyard planning commission pauses SB 284 ADU ordinance after detailed review of DADU, parking and enforcement changes

Chair opened a public hearing on Ordinance 2026-11, a set of amendments intended to bring Vineyard City Code into compliance with Utah Senate Bill 284, and asked staff to present the package.

Anthony Fletcher, a city staff member, said the project is organized in three tracks: (1) ordinance changes focused on detached accessory dwelling units (DADUs), (2) updates to administrative procedures and application materials, and (3) a water-exaction study and 40-year plan module beginning in 2028. Consultant Chris Thompson reviewed redline changes and definitions and said the ordinance consolidates internal ADUs and detached ADUs (DADUs) under an ADU umbrella while clarifying conversions of accessory structures into habitable units.

Key changes and clarifications discussed include: the state law cap on minimum lot size for DADUs (the ordinance would reduce Vineyard’s prior 12,000-square-foot threshold to the state-allowed maximum of 11,000 square feet); a statutory prohibition on making DADUs a conditional use; limits and requirements for utilities (DADUs must have internal access to sewer, culinary water, stormwater and electricity with demonstrated capacity); and parking rules that mirror state constraints while adding local enforcement mechanics.

On parking, Thompson explained that state law limits required on-site parking to a maximum of four spaces. To prevent tenant parking from blocking primary-residence garage access, staff proposed treating a single-family baseline as three required spaces; when an ADU is added the requirement moves to four and non-tandem (side-by-side) parking rules would be enforced. The consultant also noted replacement of on-site garage spaces lost when a garage is converted to a DADU, and size-based additional stall rules: DADUs 650 square feet or smaller can require one additional stall; larger DADUs may require two.

Commissioners pressed staff on several implementation points: whether ADUs count toward floor-area-ratio or lot-coverage (staff said that was not addressed in the current draft and would require follow-up), how the code treats prefabricated or mobile homes, and whether existing enforcement resources are sufficient to detect unauthorized conversions. Staff pointed to existing building-permit checks (permits are required for new plumbing or a second kitchen) and to code enforcement’s transient-occupancy rules (30-day limits and a 48-hour limit on leaving an RV parked in one place) as partial checks against the “extreme house-hacking” scenario raised by one commissioner.

A member of the public, David Loray, thanked the commission and urged stronger appearance standards for ADU entrances to avoid a duplex look and recommended not counting both the garage and the driveway when calculating available parking.

After extended line-by-line discussion and numerous redlines and clarifications, the commission declined to make a final recommendation. Chair moved to continue the item to a future meeting so staff and consultants can produce a revised draft reflecting the commission’s edits; the motion carried and no adoption vote was taken tonight.

Next steps: staff will produce another draft ordinance incorporating the clarifications and design standard language discussed; commission members asked for a future work session that includes a presentation from code enforcement on current permit/compliance activity.