Gijo John Caroline County already allows attached, detached and converted ADUs, but its current 50%/1,000-sq-ft framework needs to be reconciled with Maryland HB 1466 before the October 1, 2026 deadline.
Washington County adopted a dedicated ADU ordinance in 2025. See the 75% size rule, 1,200-sq-ft cap, parking waiver, setbacks, septic review and the separate Hagerstown pathway.
Talbot County allows interior and detached accessory dwellings, but current 35%/900-sq-ft interior limits, detached lot-size rules and parking requirements now need to be read alongside Maryland HB 1466.
Somerset County already permits several ADU forms, but its current 50% size cap and owner-occupancy rule must be read alongside Maryland’s 2026 HB 1466 requirements. See current size, parking, Critical Area and municipal considerations.
Worcester County already allows accessory apartments, but its published 35%/900-sq-ft size cap and extra-parking rule now conflict with Maryland’s 2026 ADU framework. See what applies now, the owner-occupancy change, wastewater rules, municipal carve-outs and what homeowners should verify before spending.
Cecil County still publishes an older accessory-apartment framework while Maryland’s HB 1466 requires broader ADU standards by October 1, 2026. See the current size, owner-occupancy, parking, septic and municipal-rule issues homeowners should verify now.
Wicomico County enacted Bill 2026-08, but it does not take effect until October 19, 2026. See the current rules, 50% size conflict, parking requirements, setbacks, Salisbury carve-out and septic/Critical Area checks.
St. Mary’s County still publishes legacy accessory-apartment rules that conflict with Maryland’s 2026 ADU baseline on size and parking. See what is verified now, what needs local confirmation, and how septic and Critical Area rules can affect feasibility.
Calvert County now has an updated ADU framework. See the 75% size rule, owner-occupancy requirement, parking waiver, permit steps, Critical Area issues and the separate rules for Chesapeake Beach and North Beach.
Havre de Grace ADU rules: current size, parking, owner-occupancy and Board approval requirements, plus Ordinances 1229–1233 and the September 21 hearing.
