Yes, Tiny homes are legal in Maryland but subject to zoning, building codes, and local ordinances. The Maryland Department of Housing and Community Development (DHCD) classifies them as accessory dwelling units (ADUs) or recreational vehicles (RVs), depending on foundation type and permanence. Counties like Montgomery and Baltimore have adopted 2026 updates to their zoning codes to explicitly address tiny homes, requiring compliance with the International Residential Code (IRC) Appendix Q for tiny houses on foundations.
Key Regulations for Tiny Homes in Maryland
- Zoning Compliance: Counties enforce minimum lot size, setback, and occupancy rules. For example, Baltimore County mandates a 1,000 sq. ft. minimum lot for detached tiny homes unless classified as an ADU. Check local Zoning Ordinance for exceptions.
- Building Codes: Tiny homes on foundations must meet IRC Appendix Q (2021 edition) for ceiling height, loft dimensions, and egress windows. Off-grid tiny homes (e.g., in Allegany County) may require additional permits under the Maryland Building Performance Standards.
- Utility & Health Standards: Connection to public sewer/septic is required unless the home qualifies as a “recreational park trailer” under DHCD’s 2024 guidelines. Off-grid systems must comply with Maryland Department of the Environment (MDE) regulations for composting toilets or rainwater harvesting.