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DPZ proposes 1,000‑square‑foot ADU lot‑coverage cap in planned service area

Howard County Council · January 27, 2026

Summary

DPZ said it will add a 1,000 sq ft lot‑coverage cap for accessory dwelling units within the Planned Service Area, restore a 600 sq ft cap for other accessory structures, and require plot plans to address water conveyance and bulk standards.

DPZ staff told the council an amendment to CB3 would reintroduce lot‑coverage maximums and set a 1,000‑square‑foot cap for accessory dwelling units (ADUs) inside the Planned Service Area.

"So currently within the plan service area, accessory structures have a lot coverage maximum of 600 square feet," Linda Eisenberg said. She explained the administration originally proposed removing lot‑coverage maximums but is instead restoring a 600‑sq‑ft cap for general accessory structures and adding a separate 1,000‑sq‑ft cap specifically for ADUs, citing an internal analysis that found average ADU sizes near 970 sq ft.

Council members pressed staff on stormwater and impervious‑surface tradeoffs. Eisenberg said stormwater management thresholds (which trigger at larger disturbed areas) would still apply and that DPZ would require plot plans showing how water conveyance issues are addressed at the permitting stage. DPZ clarified that off‑street parking is a separate calculation and does not count toward the ADU lot‑coverage cap; an ADU would require one additional off‑street parking space under current code.

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