ADUs are allowed in SeguinTypes:DetachedInternal
Types:DetachedInternal
Accessory Dwelling Unit (ADU) Rules for Seguin, TX
Is your property eligible for an ADU?
# of Parcels
11,165
Zoning districts
19
Avg Parcel Value
$309,004
Median Parcel Size
0.21 acres
Zoning Districts:
10,963 parcels · 19 districts
R-1
72%(7,897)
C
10%(1,139)
R-2
4%(466)
P
3%(345)
Other
10%(1,116)
ADU Rules
What can you build in Seguin, TX?
Seguin, 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 is 50% of the primary structure’s floor area.
Detached ADU Size Limits
- –Maximum size of a detached accessory dwelling unit: 50% of the square footage of the primary structure.
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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ADU rules in other Texas municipalities
Rules change at the town line. Check the municipality your property is actually in.
Guadalupe County