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What requires a residential permit in Calvert County — sheds, fences, ADUs, grading thresholds explained
Summary
County officials listed the types of work that need permits, including new dwellings, additions, accessory structures, towers/antennas, trade work by licensed masters, and described thresholds for sheds, fences, ADUs and grading.
Calvert County staff spelled out which projects require building permits and when inspections are needed. Beth Rimmer, Zoning and Permitting Division Chief, said new houses, additions, accessory structures such as sheds and pool houses, commercial changes of use, antenna/tower work and trade work (electrical, plumbing, gas) performed by licensed masters all require permits and inspections.
Rimmer and Danielle Riel gave specific thresholds: a prefab shed 200 square feet or larger requires a permit and must meet required setbacks; structures under 200 square feet are exempt but still must meet setbacks. Joe Hawkshurst said fences taller than 7 feet need a permit and that, in critical areas, essentially all work requires permitting. On accessory dwelling units (ADUs), Jason Brinkley and Beth Rimmer said detached ADUs are limited to 1,500 square feet by state law.
For earth-moving and grading, JR Cosgrove, Director of Public Works, said grading permits are required when disturbance exceeds either 5,000 square feet or 100 cubic yards of soil; stormwater management requirements are triggered at 5,000 square feet. Rimmer cautioned that site‑specific conditions (critical areas, forest retention, cultural resources) can impose additional requirements or exceptions.
