What is Dallas ADU policy?

Dallas occupies a middle position on ADUs: permitted by right with restrictions, less permissive than California state law but more open than some Texas cities. Texas has no state-level ADU preemption like California, so each city sets its own rules.

Dallas ADU standards (from Dallas Development Code):

1. Allowed zones — R-1/2 AC, R-1/2, R-5(A), R-7.5(A), R-10(A), R-16(A), D(A), and several others. Effectively most single-family residential zones.

1. Maximum size — 750 sqft floor area.

1. Maximum height — not to exceed the primary residence.

1. Setbacks — must meet the primary zone's setback requirements.

1. One per lot — maximum one ADU per single-family lot.

1. Owner occupancy — either the primary residence OR the ADU must be occupied by the property owner or a relative.

1. Lot size minimum — some zones impose a minimum lot size for ADU eligibility.

1. Parking — one additional off-street parking space required for most ADUs.

1. Short-term rental — Dallas generally prohibits using ADUs for short-term rental (under 30 days) in single-family zones.

Compared to California:

| Feature | California state law | Dallas | |---|---|---| | Preemption over local rules | Strong | None (local rules apply) | | Maximum size | 1,200 sqft (detached) | 750 sqft | | Owner occupancy required | Prohibited | Required | | Approval time | 60-day ministerial | Standard permit timeline | | Replacement parking | Not required | One additional space required |

Dallas permit process for ADUs:

1. Zoning verification — confirm your zone allows ADUs.
2. Site plan submission through City of Dallas.
3. Building plan review (4-8 weeks typical first cycle).
4. Permit fees: $1,500-$5,000 total.
5. Inspections: foundation, framing, MEP rough-in, insulation, final.

Typical Dallas ADU costs:

• Detached new-construction ADU: $200,000-$320,000.
• Garage conversion: $100,000-$180,000.
• Cost per sqft: $200-$375.

Common Dallas ADU applications:

• Aging parents living independently on child's property.
• Adult children (owner-relative occupancy).
• Rental to long-term tenant (primary occupied by owner).
• Home office or studio (if occupied as dwelling, counts as ADU; if not habitable, may be accessory structure).

What Dallas doesn't allow (without variance or zoning change):

• More than one ADU per lot.
• ADUs over 750 sqft.
• Full short-term rental programs on ADUs in single-family zones.
• ADUs on undersized lots in some zones.

Texas statewide ADU trend:

• Texas has no state preemption.
• Austin and Fort Worth allow ADUs with varying restrictions.
• Plano, Frisco, McKinney generally prohibit or restrict.
• Houston (no zoning) has the most permissive ADU environment.

AskBaily's Dallas contractor pool is familiar with current Dallas Development Code ADU standards. See /dallas and our /compare/angi-dallas teardown for deeper local context.