Does Maryland Allow Tiny Homes? What You Need to Know

Maryland is in the middle of a significant shift when it comes to tiny homes and ADUs. If you're looking at Maryland, the landscape is changing fast — and there's actually some really encouraging news if you're patient. 
 
The Big News: The ADU Act of 2025 
 
In 2025, the Maryland General Assembly passed HB 1466 — the Accessory Dwelling Units Act of 2025. This codifies a statewide policy that promotes and encourages ADU development on single-family residential properties. The state policy took effect on October 1, 2025. By October 1, 2026, local governments in charter counties and Baltimore City must adopt laws authorizing ADU development. 
 
What does this mean for tiny homes? If your tiny home qualifies as an ADU (which many do, especially on a foundation), Maryland is actively creating a legal pathway for it across the state. Like other state programs that incentivize ADU construction, Maryland's approach is tied to affordability goals. 
 
County-by-County Reality 
 
Right now, Maryland's tiny home rules are still largely determined at the county level. Montgomery County allows tiny homes as permanent residences under residential zoning. Baltimore County permits THOWs in designated areas. Garrett County is one of the most flexible — fewer restrictions, good for off-grid tiny living. Frederick County has been open to innovative housing and recently updated zoning to allow certain ADUs under 800 sq ft. 
 
On the other hand, some counties like Anne Arundel explicitly classify THOWs as recreational vehicles, which limits full-time living options. 
 
Maryland requires a minimum of 320 sq ft for a new residence in some jurisdictions, with usable rooms at 120 sq ft minimum. 
 
THOWs vs. Foundation in Maryland 
 
THOWs are generally treated as RVs in Maryland, which restricts full-time living in most areas outside of RV parks. Foundation-based tiny homes have a much smoother path — especially as the ADU Act takes effect. For a national comparison of states with the most restrictions on tiny homes, see our blog post about various restrictions around the US. 
 
Can Cocoon Homes Build in Maryland? 
 
We ship nationwide, so yes — we can absolutely build and deliver to Maryland. If you're looking at a specific county, we can help you understand the zoning and permitting situation. 
 
Talk to us at mycocoonhomes.com 
 
Based on 2024–2025 Maryland zoning data and the ADU Act of 2025. Rules vary by county — verify with your local jurisdiction.