Tiny home rules in Harford County, MD — covering tiny houses on wheels (THOWs), park model RVs, and tiny home on foundation builds — determine where they are legal and how they get permitted.
A tiny home's fate in Harford County turns on its foundation. On a permanent foundation it is a dwelling under the building code and, on septic, needs a Health Department sewage permit; on wheels it is an RV, not a permanent home.
A tiny house on a permanent foundation is a dwelling in Harford County and must meet the adopted building code for egress, ceiling height, and alarms, plus zoning district minimums for size and setbacks. On the many Harford lots served by septic, the Health Department must issue an on-site sewage disposal permit under COMAR 26.04.02.03 before the dwelling is approved. A tiny house on wheels is titled and registered as a recreational vehicle or trailer, not a permanent dwelling, and zoning does not allow living in an RV on a residential lot full-time. Either way the county, not the state, permits and inspects.
Placing a foundation tiny home without a building or sewage permit is illegal construction. Living full-time in a titled RV parked on a lot conflicts with the zoning code and draws enforcement.
Other ordinances people look up for this city. Green dot = verified primary-source excerpt.
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See how Harford County's tiny homes rules stack up against other locations.
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