ADUs are allowed in Mason CityTypes:DetachedInternal
Types:DetachedInternal
Accessory Dwelling Unit (ADU) Rules for Mason City, IA
Is your property eligible for an ADU?
# of Parcels
13,716
Zoning districts
13
Avg Parcel Value
$195,113
Zoning Districts:
14,005 parcels · 13 districts
Z2
76%(10,594)
Z3
8%(1,102)
Z4
7%(1,030)
Z6-R
3%(387)
Other
6%(892)
ADU Rules
What can you build in Mason City, IA?
Mason City, IA 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 ADU size is the greater of 1,000 sq ft or 50% of the primary dwelling’s ground-floor area
Detached ADU Size Limits
- –Maximum ADU size is 1,000 sq ft or 50% of the primary dwelling’s ground floor area, whichever is greater
Owner Occupancy
- –Owner occupancy is not required.
Parking
- –Minimum 1 space/ADU (Z3); Z1 2, Z2 1.5; Z7-5/6 not specified; maximum not stated. General residential ratios apply; up to 10% deviation in site plan review; shared parking only with multiple functions.
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.
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ADU rules in other Iowa municipalities
Rules change at the town line. Check the municipality your property is actually in.
Cerro Gordo County