Maryland ADU Guide provides general educational and research information about accessory dwelling units, zoning, permitting, costs, planning, and related topics in Maryland.
Not professional advice
The information on this website is not legal, architectural, engineering, surveying, tax, financial, real-estate, construction, zoning, or other professional advice. Reading this site does not create a professional-client relationship with Maryland ADU Guide or its contributors.
Property-specific questions can depend on facts that a general website cannot determine, including lot dimensions, easements, utilities, environmental constraints, historic-district requirements, private covenants, title conditions, building-code issues, and the interpretation of the authority having jurisdiction.
Verify current requirements
We make a good-faith effort to research from official sources and keep important information current, but statutes, ordinances, forms, fees, interpretations, procedures, department contacts, and online resources can change. A page’s publication or review date does not guarantee that every requirement remains unchanged.
Before purchasing plans, hiring a contractor, committing funds, or beginning construction, verify the requirements that apply to your property with the appropriate Maryland county, municipality, permitting authority, utility, and qualified professional where necessary.
Independent publication
Maryland ADU Guide is an independent publication. It is not operated by, endorsed by, or affiliated with the State of Maryland or any Maryland county, municipality, planning department, permitting agency, or other government body unless a relationship is explicitly stated.
Estimates, calculators, and planning tools
Any calculator, worksheet, checklist, cost range, timeline, feasibility tool, or comparison on this website is intended for preliminary planning only. Outputs are estimates or organizational aids, not bids, approvals, zoning determinations, permit decisions, or guarantees of project feasibility.
External links
We link to government agencies and other external websites to help readers verify information and continue their research. External websites are controlled by their respective owners. We are not responsible for changes to their content, availability, security, or policies.
Commercial and referral relationships
Maryland ADU Guide may use advertising, referral relationships, partnerships, affiliate links, or paid resources as the publication develops. Where a commercial relationship is relevant to a recommendation or reader decision, we intend to disclose it clearly. Readers should still evaluate any contractor, designer, product, or service independently before hiring or purchasing.
No guarantee of outcome
Every property and project is different. Maryland ADU Guide does not guarantee permit approval, construction cost, project duration, financing availability, rental income, property value, contractor performance, code compliance, or any other project outcome.