ADUs are allowed in Johnson CityTypes:DetachedInternal
Types:DetachedInternal
Accessory Dwelling Unit (ADU) Rules for Johnson City, TX
Is your property eligible for an ADU?
# of Parcels
852
Zoning districts
12
Avg Parcel Value
$476,130
Zoning Districts:
851 parcels · 12 districts
SF
49%(416)
MH
15%(124)
HC
10%(85)
DD
8%(68)
Other
19%(158)
ADU Rules
What can you build in Johnson City, TX?
Johnson City, TX 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 Internal ADU size: 250 sq ft or 25% of the main building’s floor area, whichever is greater.
Detached ADU Size Limits
- –Maximum size for a detached accessory dwelling unit: greater of 250 sq ft or 25% of the existing floor area of the main building.
Max Units
- –1 ADU per lot/tract in residential districts (SF, MR, MH, CHD)
Owner Occupancy
- –No owner-occupancy requirement for ADUs
Parking
- –Min 1 space/ADU (MR: 1-bed; CHD: 1); SF and MH require 2; max not stated; off-street on the lot; Article VI applies in non-residential districts with no numeric ratios.
ADU State Law
What can you build in Texas?
- –Texas does not have a statewide ADU law. ADUs are regulated entirely at the local level.
- –ADU rules vary significantly by city, and many jurisdictions prohibit ADUs outright.
- –Counties generally lack zoning authority, but other restrictions may still apply outside city limits.
- –Outside city limits, ADU feasibility often depends on subdivision rules, deed restrictions, and septic or fire requirements.
- –Building/fire codes are set statewide, but whether an ADU is allowed is local zoning.
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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Is your property eligible for an ADU?
ADU rules in other Texas municipalities
Rules change at the town line. Check the municipality your property is actually in.
Blanco County