ADUs are allowed in JoshuaTypes:DetachedInternal
Types:DetachedInternal
Accessory Dwelling Unit (ADU) Rules for Joshua, TX
Is your property eligible for an ADU?
# of Properties
2,161
Owner-occupied
70%
Zoning districts
18
Avg Home Value
$292,165
Median Lot Size
0.34 acres
Avg Income
$85,519
Residential Types:
2,161 housing units
Single Family
86%
2-3 Family
2%
Other
12%
Zoning Districts:
2,743 parcels · 18 districts
R1
51%(1,404)
PD
20%(537)
C1
11%(295)
A
4%(105)
Other
15%(402)
ADU Rules
What can you build in Joshua, TX?
Joshua, 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: Conditional Use Permit
Interior / Attached ADU Size Limits
- –Maximum size is the lesser of 25% of the principal structure’s floor area or 800 sq ft; on A–Agricultural lots of 10+ acres, a single ADU may be up to 50% of the principal structure (both ADUs together may not exceed 50%).
Detached ADU Size Limits
- –Maximum detached ADU size is 25% of the main home’s floor area, capped at 800 sq ft; on A‑Agricultural lots of 10+ acres, one ADU may be up to 50% of the primary home (total across two ADUs still limited to 50%).
Max Units
- –Up to 2 ADUs per lot (A district ≥10 acres; max 50% of primary floor area). 0 ADUs per lot in R-2, R-3, R-4.
Owner Occupancy
- –Principal residence must be owner-occupied; covenant ensures either unit.
Parking
- –1.5 spaces/ADU; none max; ADUs limited to 1-bedroom; off-street parking at 1-bedroom rate; City Manager may approve alternative parking plans with up to 50% adjustment
Rental Restrictions
- –Short-term rentals (<30 days) require a Conditional Use Permit in A, R‑1L, and R‑1 districts; permitted by right in R‑2, R‑3, and R‑4.
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.
Johnson County