ADUs are allowed in PortlandTypes:DetachedInternal
Types:DetachedInternal
Accessory Dwelling Unit (ADU) Rules for Portland, TX
Is your property eligible for an ADU?
# of Parcels
6,162
Zoning districts
16
Avg Parcel Value
$574,895
Zoning Districts:
6,160 parcels · 16 districts
R-6
65%(4,033)
R-8
10%(616)
OT2
6%(384)
R-7
5%(315)
Other
13%(812)
ADU Rules
What can you build in Portland, TX?
Portland, TX follows state and local rules for Accessory Dwelling Units. Here is a concise overview of the local rules.
Eligibility
- –Internal / Attached ADU: Special Permit
- –Detached ADU: Special Permit
Interior / Attached ADU Size Limits
- –Maximum ADU size is 50% of the principal dwelling’s living space.
Detached ADU Size Limits
- –Maximum size of 50% of the principal dwelling’s living space
Max Units
- –1 ADU per lot
Rental Restrictions
- –STRs: main dwelling and ADU cannot be rented as two separate STRs on the same lot; STR stays must be at least 2 nights unless the owner/operator is on-site overnight.
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.
San Patricio County