Can you build a PSL Modular unit in Maryland?

Yes, in single-family neighborhoods. Maryland's 2025 ADU Act (HB 1466), effective October 1, 2025, makes ADUs a by-right use — they don't need pre-approval from a zoning board — though you still go through permitting and meet local guidelines. Counties and municipalities with zoning authority must adopt enabling ordinances by October 1, 2026. An ADU is defined as a secondary unit on the same lot as a single-family detached home, no larger than 75% of the primary unit.

The Maryland Department of Labor, Division of Labor and Industry, Building Codes Administration, under the Industrialized Buildings and Mobile Homes regulations (COMAR 09.12.52). A green state certification label is affixed inside the home (commonly inside a kitchen cabinet), and units are built to the Maryland Model Performance Code (which incorporates the I-codes and NEC). With the label, your local jurisdiction permits the site work without re-reviewing the structure.

Yes, and it was ahead of the state — Montgomery County loosened ADU restrictions in 2019, and ADU permits grew sharply afterward. Under the 2025 state law, counties like Montgomery and Prince George's, plus Baltimore, will align local ordinances with the by-right standard by the 2026 deadline. Confirm your county's current rules.

It depends on your region. The Eastern Shore and Ocean City bring coastal wind and FEMA flood elevation; Western Maryland (Garrett County) brings real snow load; central Maryland and the DC suburbs are milder. Seismic risk is low. PSL Modular sets the envelope and any coastal/flood spec from your site.

Yes — the Maryland DC suburbs are high-cost, and a by-right ADU is now a strong rental or multigenerational play. The green-label unit keeps the building out of local plan review; your work is the county's ADU standards and the site. Turnkey delivery suits tight suburban lots.