State Preemption of Local Zoning in Rhode Island
How Rhode Island state law overrides local zoning ordinances. ADU preemption, lot split preemption, and impact on city-level regulations.
What Is State Preemption?
State preemption occurs when a state law overrides local government ordinances in a specific area. In land use, preemption means a city or county cannot adopt zoning rules that are more restrictive than the state standard. If a city tries to prohibit something the state law permits, the state law wins.
Rhode Island actively uses preemption in housing law. The state has enacted legislation that prohibits local governments from blocking certain types of housing development — most notably accessory dwelling units (ADUs) and lot splits.
ADU Preemption
Rhode Island H 7637 — Relating to Zoning: Accessory Dwelling Units (2024)
This law preempts local ordinances — cities cannot impose rules stricter than the state ADU standard. Effective 2024-07-01.
What local governments cannot restrict:
- ADUs must receive ministerial approval — no discretionary review, public hearing, or variance required
- Municipalities may establish reasonable dimensional standards but cannot effectively prohibit ADUs
- Maximum ADU size may be regulated locally but cannot be set below 750 sq ft
- Building permit review must follow standard ministerial standards — no special zoning approval required
How Preemption Affects Rhode Island Cities
State preemption applies to every incorporated city and unincorporated area in Rhode Island. Select a city below to see how state preemption interacts with local zoning rules.
Source: Rhode Island H 7637 — Relating to Zoning: Accessory Dwelling Units (2024). Last verified April 5, 2026. View source