ADUs are allowed in SunnyvaleTypes:DetachedInternal
Types:DetachedInternal
Accessory Dwelling Unit (ADU) Rules for Sunnyvale, TX
Is your property eligible for an ADU?
# of Properties
3,212
Owner-occupied
83%
Zoning districts
19
Avg Home Value
$644,614
Median Lot Size
0.49 acres
Avg Income
$164,441
Residential Types:
3,212 housing units
Single Family
98%
Other
2%
Zoning Districts:
4,238 parcels · 19 districts
PD(PRO-463
25%(1,044)
PD(PRO-464
12%(500)
SF-2
11%(462)
SF-3
10%(431)
Other
42%(1,801)
ADU Rules
What can you build in Sunnyvale, TX?
Sunnyvale, 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
Detached ADU Size Limits
- –Maximum detached ADU size equals the combined accessory-building floor area limit by lot size: 3,000 sq ft (2–<3 ac), 3,500 sq ft (3–<4 ac), 4,000 sq ft (4–<5 ac), 4,500 sq ft (5–<10 ac), or 3% of lot area (10+ ac); ADUs are not allowed on lots under 2 acres.
Max Units
- –SF-5: 0 per lot
- –MF: 0 per lot
Owner Occupancy
- –Owner occupancy not required.
Parking
- –No ADU-specific parking min/max; ADU standards do not require or modify parking; townwide SFD standard requires 2 off-street spaces, not applied to ADUs
Rental Restrictions
- –ADUs shall not be leased or sublet; no short- or long-term rentals allowed.
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.
Dallas County