ADUs are allowed in Marble FallsTypes:DetachedInternal
Types:DetachedInternal
Accessory Dwelling Unit (ADU) Rules for Marble Falls, TX
Is your property eligible for an ADU?
# of Properties
1,589
Owner-occupied
0%
Zoning districts
16
Avg Home Value
$379,373
Median Lot Size
0.29 acres
Residential Types:
1,589 housing units
Agricultural
100%
Zoning Districts:
3,228 parcels · 16 districts
ENZ-2
39%(1,260)
GC
13%(417)
DR
9%(283)
ENZ-3
8%(274)
Other
31%(994)
ADU Rules
What can you build in Marble Falls, TX?
Marble Falls, 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 an internal/attached ADU is 25% of the principal building's total square footage.
Detached ADU Size Limits
- –Max detached ADU area: 25% of principal building GFA (non-FR/RE/ENZ-1). Applies to one- and second-story detached ADUs.
- –Max detached ADU area: 7.5% of lot area (non-FR/RE/ENZ-1). Applies to one- and second-story detached ADUs.
- –Max detached ADU area in FR, RE, ENZ-1: 33% of principal building GFA. Applies to one- and second-story detached ADUs.
- –Max detached ADU area in FR, RE, ENZ-1: 1,200 sq ft cap. Applies to one- and second-story detached ADUs.
- –Max detached ADU area limited by accessory building size per Sec. 4.6.1 by district.
Max Units
- –Detached single-family: 1 ADU/lot (attached or detached)
- –Duplex/multifamily/other: 0 ADUs
Owner Occupancy
- –No owner-occupancy requirement.
Parking
- –1 off-street space per ADU (in addition to the principal); tandem parking allowed (max 1 per lot); director may approve reductions or alternative arrangements, including on-street parking via a parking study.
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.
Burnet County