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Plan commission reviews sliding scale for maximum impervious coverage by lot size
Summary
Staff proposed a sliding maximum for impervious surface coverage tied to lot size (55% for lots under one acre, 50% for 1–2 acres, and 45% for lots over two acres) and the commission indicated tentative agreement to move the approach forward.
The Plan Commission reviewed a new approach to maximum impervious surface coverage that ties limits to parcel size.
Staff explained the draft replaces a single blanket maximum with a sliding scale: lots under one acre would retain a 55% maximum impervious coverage, lots from one to two acres would be limited to 50%, and lots more than two acres would be limited to 45% (which aligns with the proposed building-coverage standard). The sliding scale was described as a way to reduce relative coverage as lot sizes increase while avoiding unnecessary restrictions on smaller nonconforming parcels.
Commissioners said they had no immediate objection to the approach but noted they lacked technical hydrology or stormwater modeling in the meeting and flagged that the change should be checked for consistency with applicable stormwater rules and drainage requirements. The group indicated informal agreement to include the sliding scale in the next redline draft.
Staff will incorporate the sliding-scale table into the redline and follow up on consistency with stormwater and subdivision standards before the public‑hearing draft.
