ADUs are allowed in Round RockTypes:DetachedInternal
Types:DetachedInternal
Accessory Dwelling Unit (ADU) Rules for Round Rock, TX
Is your property eligible for an ADU?
# of Properties
28,015
Owner-occupied
75%
Zoning districts
26
Avg Home Value
$432,899
Median Lot Size
0.18 acres
Avg Income
$127,460
Residential Types:
28,015 housing units
Other
100%
Zoning Districts:
31,363 parcels · 26 districts
SF2
66%(20,756)
PUD
20%(6,418)
TF
5%(1,484)
C1
2%(637)
Other
7%(2,068)
ADU Rules
What can you build in Round Rock, TX?
Round Rock, 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 450 sq ft per floor for an internal or attached ADU.
Detached ADU Size Limits
- –Maximum size of 450 sq ft per ADU floor in the MU-L district.
Max Units
- –1 ADU per platted lot
Owner Occupancy
- –ADUs must be occupied by owner or manager on the same lot.
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.
Williamson County