Do I Need a Permit to Build an ADU in Dallas, TX?

ADU-specific overview

What makes this different from a simple accessory structure

Pulled from the city's ADU guidance and linked code references.

Permit type: Residential new construction building permit filed through Dallas ePlan (eservices.dallascityhall.com). An ADU is treated as a new dwelling unit, not as a minor accessory structure.
Maximum size: 1,500 square feet of gross floor area, or 50 percent of the gross floor area of the primary dwelling, whichever is less.
Setbacks: 5 feet from rear and interior side property lines. Front-yard setbacks follow the base zoning district standard. Setbacks from easements and utilities may also apply.
Owner occupancy: Dallas Development Code Article IV does not impose a blanket owner-occupancy requirement for ADUs in the base residential zoning districts reviewed for this page. Confirm with Development Services if the specific parcel carries overlay or deed restrictions that differ.
Parking: One additional off-street parking space is required for an ADU. The space must comply with Dallas Development Code dimensional and driveway-access standards.
Utilities: The ADU requires separate utility connections for water, sewer, and electricity. Dallas Water Utilities and Oncor service requirements apply. A new utility tap can trigger additional connection fees.
JADU distinction: Dallas does not have a California-style Junior ADU (JADU) track. Interior conversions that create a full dwelling unit are treated as a residential alteration or new-construction permit under the standard Dallas residential review path.

Dallas does not have a statewide ADU preemption law. Local zoning rules, not state law, govern ADU eligibility.
Texas HB 2127 (88th Legislature) restricts some forms of local regulation but is not an ADU-specific preemption statute. Dallas Development Code ADU standards remain in effect.
Private deed restrictions recorded with Dallas County may prohibit ADUs even where city zoning allows them. Always check the recorded plat before applying.

Conditions

Full permit conditions

All 8 conditions for Dallas adu permits.

A permit is required to build any accessory dwelling unit (ADU) in Dallas — the city classifies an ADU as a separate dwelling unit subject to residential building permit requirements.
Dallas Development Code Article IV allows ADUs in most residential base zoning districts including SF-1, SF-2, SF-3, SF-A, TH, and certain MF zones, subject to the specific standards for each district.
The ADU may not exceed 1,500 square feet of gross floor area, or 50 percent of the gross floor area of the primary dwelling, whichever is less.
The ADU must comply with minimum setback requirements: 5 feet from rear and interior side property lines. Front-yard setbacks follow the base district standard.
Dallas requires one additional off-street parking space for an ADU. The parking space must meet Dallas Development Code dimensional and access standards.
The ADU structure may not exceed the height of the primary dwelling or 30 feet, whichever is less.
Each ADU requires a separate address, and utility connections are subject to Dallas Water Utilities and Oncor service standards.
Dallas zoning ordinance requirements and any applicable HOA deed restrictions apply in addition to the building permit requirements.

Fees

Estimated city fees

Baseline for a simple permitted adu: $1,500–$4,500+ in combined city permit, plan review, and trade permit fees is a practical Dallas ADU planning range before site, utility, or HOA costs

Fee	Amount	Notes
Residential building permit fee	$500–$1,500 (estimated, based on construction valuation)	Dallas Development Services calculates permit fees on a sliding scale tied to declared construction value. An ADU is priced as a residential new-construction project, so fees will be higher than for a simple accessory structure. Verify the current fee schedule at dallascityhall.com/departments/sustainabledevelopment before submitting.
Plan review fee	Approximately 65% of building permit fee	Dallas charges plan review at roughly 65% of the building permit fee for projects requiring a separate plan check. This is typically included in the total fee quote at application intake.
Trade permit fees (electrical, plumbing, mechanical)	$250–$800+ each depending on scope	Habitable ADUs require separate mechanical, electrical, and plumbing permits in addition to the main building permit.
Inspection fees	Included	Standard required inspections are covered under the permit. Re-inspection fees apply if work fails or is not ready when the inspector arrives.

Documents

Required documents

Residential new construction building permit application submitted through Dallas's ePlan portal at eservices.dallascityhall.com.
Scaled site plan showing lot lines, existing structures, proposed ADU footprint, setback dimensions, parking space, and access.
Architectural floor plans and elevations showing interior layout, room sizes, ceiling heights, fenestration, and exterior design.
Structural drawings with footing, foundation, framing, and connection details compliant with the 2021 IRC and Dallas City Code Chapter 52 amendments.
Calculation or statement confirming the ADU gross floor area does not exceed 1,500 square feet or 50 percent of the primary dwelling GFA.
Utility service plan identifying water, sewer, and electrical connection points for the ADU.
Trade permit applications for electrical, plumbing, and mechanical work associated with the ADU.
Any HOA approval documentation required by your subdivision covenants, conditions, and restrictions.

Timeline

Typical timing

Plan review: 7–10 business days for initial residential plan review
Total cycle: 6–12 weeks from application to final inspection

ADU plan review may involve multiple disciplines (zoning, building, utilities). Resubmittals for corrections, trade permit reviews, and inspection scheduling each add time. Budget 8–12 weeks for a straightforward project without revisions.

Process

How the permit process works

Confirm zoning eligibility Verify the parcel's base zoning district allows ADUs under Dallas Development Code Article IV. Use Dallas's GIS zoning map or contact Development Services to confirm the base zone and any applicable overlay restrictions.
Verify deed restrictions and HOA rules Even if the city zoning allows an ADU, private deed restrictions recorded with the county may prohibit secondary dwelling units. Check the recorded plat and subdivision covenants through Dallas County records before committing to design.
Prepare permit documents Assemble a complete application package including site plan, architectural and structural drawings, GFA calculation, and utility connection plan. Confirm the ADU does not exceed the 1,500 sq ft / 50% GFA limit and satisfies the 5-foot side and rear setbacks.
Submit through Dallas ePlan and pay fees Create or log in at eservices.dallascityhall.com, select the residential new construction permit type, upload your documents, and submit. Walk-in service is available at the Development Services Building, 320 E. Jefferson Blvd., Dallas, TX 75203.
Work through plan review comments Dallas reviewers evaluate the submittal against the 2021 IRC, Dallas City Code Chapter 52, and the Dallas Development Code. Respond to any correction notices and resubmit updated drawings through the ePlan portal.
Obtain trade permits File separate electrical, plumbing, and mechanical permit applications through the ePlan portal. These can be submitted concurrently with or immediately after the main building permit approval.
Schedule inspections and close out permits Request required inspections — foundation/footing, framing, rough-in trades, and final — through the ePlan portal as construction progresses. Once all inspections pass and permits are finaled, the ADU may be lawfully occupied.

Code basis

What Dallas reviews against

2021 International Residential Code (IRC) with local amendments under Dallas City Code Chapter 52; Dallas Development Code Article IV (Residential Zoning District Standards) for ADU use and dimensional standards.

Residential permit page Dallas permit portal

If you skip the permit

What can go wrong

Dallas Development Services can issue a stop-work order and require full after-the-fact permitting on any unpermitted dwelling unit.
An unpermitted ADU that does not meet zoning setback, size, or parking requirements may be required to be demolished or brought into compliance at the owner's expense.
Fines and daily penalties can accrue under the Dallas City Code until the violation is resolved.
Homeowner's insurance may deny claims for damage to or caused by an unpermitted structure.
An unpermitted ADU can block or complicate a refinance, HELOC, or home sale due to disclosure requirements and lender requirements.
Without a certificate of occupancy, the ADU cannot be lawfully occupied or rented, and any rental income may not be insurable or legally defensible.