HI SB2423

Prohibits Hawaii counties from requiring residential lots in urban districts to exceed 2,500 square feet, or from imposing setbacks greater than 10 feet (front), 5 feet (back/sides), or requiring more than one parking space per unit

Prevents counties from mandating covered parking, restricting fence heights below 7.5 feet, or capping accessory dwelling units at less than 1,250 square feet in urban zones

Exempts lands in special management areas, special flood hazard areas, tsunami evacuation zones, shoreline areas, and other county-designated hazard zones from these restrictions

Allows neighborhoods to petition (requiring 75% of parcel owners) to retain stricter lot requirements, subject to county notice and public hearing processes

Preserves county authority over wastewater, water, stormwater, fire safety, and other public health standards; effective date set for July 1, 2050