ADUs are allowed in McKinneyTypes:DetachedInternal
Types:DetachedInternal
Accessory Dwelling Unit (ADU) Rules for McKinney, TX
Is your property eligible for an ADU?
# of Properties
2,490
Owner-occupied
29%
Zoning districts
43
Avg Home Value
$137,649
Median Lot Size
0.34 acres
Avg Income
$144,743
Residential Types:
2,490 housing units
2-3 Family
30%
Apts (4+ units)
30%
Other
39%
Zoning Districts:
59,890 parcels · 43 districts
PD
84%(50,546)
RS-60
6%(3,602)
RS-84
2%(1,060)
MTC
1%(639)
Other
7%(4,043)
ADU Rules
What can you build in McKinney, TX?
McKinney, TX follows state and local rules for Accessory Dwelling Units. Here is a concise overview of the local rules.
Eligibility
- –Internal / Attached ADU: Conditional Use Permit
- –Detached ADU: By Right
Detached ADU Size Limits
- –REC zone detached/ancillary unit maximum of 1,000 sq ft of dwelling space.
- –Citywide detached ADU maximum: 50% of primary dwelling GBA, or 75% if the primary dwelling is 1,200 sq ft or less.
Max Units
- –1 ADU per conforming lot
- –1 ADU per single-family dwelling lot
Parking
- –1 space/ADU; max unspecified. Exceptions: on-site threshold waives ADU parking (4 spaces on-site, or 3 in H Overlay). In MTC, new residentials require 1 space/DU; existing buildings/conversions exempt; shared/public parking allowed (shared within 500 ft; in MTC, public spaces within 200 ft may satisfy up to 100%).
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.
Collin County