ADUs are allowed in MandanTypes:DetachedInternal
Types:DetachedInternal
Accessory Dwelling Unit (ADU) Rules for Mandan, ND
Is your property eligible for an ADU?
# of Properties
6,949
Owner-occupied
81%
Zoning districts
18
Avg Home Value
$308,043
Median Lot Size
0.20 acres
Avg Income
$82,250
Residential Types:
6,949 housing units
Other
100%
Zoning Districts:
9,427 parcels · 18 districts
R7
38%(3,575)
RM
16%(1,525)
DF
11%(1,057)
R3.2
11%(1,014)
Other
24%(2,256)
ADU Rules
What can you build in Mandan, ND?
Mandan, ND follows state and local rules for Accessory Dwelling Units. Here is a concise overview of the local rules.
Eligibility
- –Internal / Attached ADU: By Right
- –Detached ADU: By Right
Interior / Attached ADU Size Limits
- –Maximum size for an internal or attached ADU: the lesser of 800 sq ft or 40% of the dwelling’s habitable floor area.
Detached ADU Size Limits
- –Maximum detached ADU size of 800 sq ft
- –Accessory building limits: In R3.2, R4, R7, RH, and RMH, a detached ADU may not exceed the lesser of 10% of lot area or 75% of the primary structure’s size; in RM, CA, CB, and CC, detached ADUs are limited to 20% of lot area
Max Units
- –1 ADU per lot
- –Attached/internal or within accessory structure: 1 per lot
- –Duplex/multifamily: none specified; JADU: none specified
Owner Occupancy
- –Owner must occupy the unit as the parcel’s residence for >6 months.
Parking
- –1 off-street space per ADU (in addition to primary dwelling parking); no max. Exceptions: on-site or within 400 ft with BOA; 50% of required parking exterior; CB Commercial core may waive ADU parking where allowed.
What's allowed on your lot?
These are the municipality-wide rules. What's allowed on a specific property also depends on state laws, setbacks, floor area ratio, lot coverage, environmental constraints, topography, and other property-specific factors. Search your address on FutureLot to see what's allowed on your property.
Check my propertyHow can we help you?
Get matched with trusted local builders
Understand what's allowed on your property
Learn the key rules and size limits for ADUs