ADU Rules in Baltimore, MD — 2026 Guide
Check if your Baltimore property qualifies for an ADU in 20 seconds
Baltimore ADU Rules at a Glance
Baltimore has limited ADU support. Here is what you need to know.
- Baltimore permits accessory apartments through a conditional use process.
- ADU limited to one per lot and must be owner-occupied.
- Rowhouse lots often too narrow for detached ADUs — internal conversions preferred.
- MD HB 1045 (proposed) would create statewide ADU standards if passed.
What ReadyPermit Checks for Baltimore Properties
Enter any Baltimore address and get an instant ADU feasibility analysis covering:
Zoning Compliance
Verify your Baltimore lot is zoned for ADU construction under current MD and local rules.
Setbacks & Coverage
Check required setbacks, lot coverage limits, and height restrictions for your specific parcel.
ADU Size Limits
Calculate the maximum ADU square footage allowed based on your lot size and primary dwelling.
Permit Requirements
Understand what permits and approvals Baltimore requires before you can break ground.
Flood & Hazard Zones
Identify if your property falls in a flood zone, fire zone, or other hazard overlay.
Lot & Parcel Data
Pull parcel boundaries, lot dimensions, and existing structures from county records.
Check Your Baltimore Property Free
Enter your address below. In under 20 seconds you will know if your Baltimore lot qualifies for an ADU — no phone calls, no waiting.
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