Winfield adopts ADU ordinance allowing accessory dwelling units with limits and permitting rules

Winfield trustees on April 2 adopted an ordinance amending the zoning code to allow accessory dwelling units (ADUs) in single‑family residential districts, establishing design and permitting limits intended to preserve neighborhood character while expanding housing options.

Community Development Director Peter Clements said the ordinance authorizes three ADU types—detached, attached and internal—subject to conditions. ADUs will be permitted only on owner‑occupied properties, must be self‑contained with separate entrance, kitchen and bathroom, and are capped at 800 square feet; attached units are limited to 40 percent of the principal dwelling’s floor area.

The ordinance requires an additional off‑street parking space per ADU, connection to public water and sewer and separate metering for detached units. Clements said each ADU must have its own address to ensure mail delivery and emergency services access. He told trustees the plan and zoning commission had approved the ordinance 5‑0.

Trustees asked technical questions about water, sewer and gas service capacities and whether existing service lines would need to be upsized. Staff said building permit applications require fixture counts and plans so the village can verify service capacity under the International Residential Code; the village also expects separate meters and service lines when appropriate.

After discussion, the board voted to adopt the ADU ordinance. Officials said the ordinance establishes local standards ahead of any statewide mandate and leaves room to adjust the local code if a future state requirement takes effect.