Maryland’s New ADU Law: What Homeowners Need to Know in 2026

Big news for Maryland homeowners: as of October 1, 2025, a new state law makes it easier than ever to build Accessory Dwelling Units (ADUs) across Maryland. If you’ve ever dreamed of adding a backyard cottage, guest quarters, in-law suite, or basement apartment, this could be your moment!

ADUs, are small, independent homes built on the same lot as a primary residence. They offer a flexible, affordable way to expand living space, house loved ones, or generate extra income.

Why ADUs Matter

• Affordable Housing: ADUs help ease housing shortages by creating more options for renters and homeowners alike.
• Multigenerational Living: They’re perfect for families who want grandparents, adult children, or caregivers close by, with privacy for everyone.
• Rental Income: Homeowners could potentially be allowed to rent out their ADU for extra income, helping offset mortgage costs or fund future plans.

What’s Changing in Maryland?

Previously, many Maryland counties, like Prince George’s (PG) County, had strict rules about what you could and couldn’t include in a secondary unit. For example, stoves in basement apartments were often a no-go. But with this new law, the state is paving the way for more flexibility and fewer permitting headaches. It has yet to be determined if stoves will be permited in basements in PG County but we are hopeful that more flexibility will come from this new bill.

Here’s what you need to know:

• Each county, including PG County, must figure out their specific requirements by October 2026.
• PG County has even created an ADU task force to help shape local regulations and make the transition smoother.
• The task force meetings can be viewed here . 

What Should Homeowners Do Next?

If you’re thinking about adding an ADU, start by searching for ADU updates in your specific county. Regulations may still vary, and local governments are working hard to finalize their rules. Keep an eye on announcements, especially if you’re in PG County, where changes to old restrictions could open up new possibilities. You can sign up for email alerts from the county council or visit this webpage to view previous videos and look out for upcoming meetings. 

This is a major step toward more flexible, affordable, and inclusive housing in Maryland. Whether you’re planning for family, looking to supplement your income, or just want more space, now’s the time to explore your options and stay informed of changes.