ADUs are allowed in BoerneTypes:DetachedInternal
Types:DetachedInternal
Accessory Dwelling Unit (ADU) Rules for Boerne, TX
Is your property eligible for an ADU?
# of Parcels
3,901
Zoning districts
20
Avg Parcel Value
$739,185
Median Parcel Size
0.25 acres
Zoning Districts:
3,869 parcels · 20 districts
R1-M
35%(1,340)
R2-M
31%(1,188)
C3
9%(351)
R1-L
7%(254)
Other
19%(736)
ADU Rules
What can you build in Boerne, TX?
Boerne, 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 size of 1,200 sq ft
- –Maximum size of 30% of the principal building footprint
Detached ADU Size Limits
- –Maximum detached ADU living area of 1,200 sq ft
- –Maximum detached ADU living area of 30% of the principal building’s footprint
Max Units
- –1 ADU per lot (any type: garage apt, detached guest house, or attached apt)
Owner Occupancy
- –Owner must reside in primary or ADU and not rent owner-occupied unit.
Parking
- –1 space/ADU (on-site, in addition to primary dwelling); no max; must be behind the minimum required front-yard setback line
Rental Restrictions
- –Owner-occupied unit may not be rented.
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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