Everything homeowners ask about building an ADU in Dallas — answered with 2026 data.
Sometimes — but not by right. A Dallas single-family lot gets one dwelling unit by right (Sec. 51A-4.209(b)(6)(A)). A rentable ADU needs a Board of Adjustment special exception ($600, owner-occupancy deed restriction, annual rental registration; Sec. 51A-4.209(b)(6)(E)(iii)) or a lot inside an Accessory Dwelling Unit Overlay that a neighborhood of 50 or more houses petitions for (Sec. 51A-4.510). Neither is a counter application. Zoning: Not by right. Single family use is one dwelling unit per lot (Sec. 51A-4.209(b)(6)(A)). A rentable ADU needs a Board of Adjustment special exception, available in any district (Sec. 51A-4.209(b)(6)(E)(iii)), or a lot inside an adopted Accessory Dwelling Unit Overlay (Sec. 51A-4.510), petitioned for by 10 or more owners for 50 or more houses. A non-rental family unit is a separate 'additional dwelling unit' special exception with a no-rent deed restriction (Sec. 51A-4.209(b)(6)(E)(i)-(ii)). Because approval is discretionary, confirm your own parcel with the planning department before budgeting. See our full Dallas ADU rules page.
ADU construction in Dallas typically costs $130,000-$320,000. The cost per square foot averages $250-$400. Garage conversions are more affordable at $30,000-$100,000, while prefab ADUs cost $150,000-$300,000. Permit fees add $1,200-$1,400 building permit for a 600-1,000 sq ft unit: Table A-I ($1.07 per sq ft up to 700 sq ft; $0.34569 per sq ft plus $300 above) plus $577 plan review, $25 handling and $15 technology fee (fee schedule of July 1, 2025); Board of Adjustment special exception $600 (Ch. 52 Sec. 303.12.1.4). to your budget. See our detailed Dallas ADU cost guide.
Detached ADUs in Dallas can be up to Greater of 700 sq ft or 25% of the main structure's floor area, minimum 200 sq ft. Attached ADUs are limited to Greater of 700 sq ft or 25% of the main use's floor area. Junior ADUs (JADUs) have a cap of No junior ADU category in Dallas. A rentable unit inside the house is an accessory dwelling unit under the same Sec. 51A-4.510 / Sec. 51A-4.209(b)(6)(E)(iii) rules; a non-rental family suite is an 'additional dwelling unit' special exception (Sec. 51A-4.209(b)(6)(E)(i)). Maximum height is May not exceed the height of the main dwelling, and one story maximum (Sec. 51A-4.510(c)(2)(D)(i) and (G)); a unit over a detached garage may go to the district height cap, 30 ft in R-5(A) and R-7.5(A) (Sec. 51A-4.510(c)(2)(D)(ii); Sec. 51A-4.112). Outside an overlay Sec. 51A-4.209(b)(6)(E)(vii)(cc) also caps any accessory structure at the main building's height. You are allowed up to One ADU per lot: the unit is defined as a single rentable dwelling subordinate to the main unit on a qualifying lot.
Rear setback: 3 ft when the structure is under 15 ft tall (Sec. 51A-4.510(c)(2)(B)(ii)); at 15 ft or taller the base district rear yard applies, 5 ft for single-family structures in R-5(A) and R-7.5(A) (Sec. 51A-4.112). Outside an overlay Sec. 51A-4.403(b)(2) lets an accessory structure under 15 ft sit 3 ft from a rear line on an alley, or on the line where there is no alley. Side setback: 3 ft when the structure is under 15 ft tall and in the rear 30% of the lot (Sec. 51A-4.510(c)(2)(B)(i)); otherwise the base district side yard, 5 ft for single-family structures in R-5(A) and R-7.5(A) (Sec. 51A-4.112). A corner lot's street side keeps the front-yard rule. Outside an overlay Sec. 51A-4.402(b)(3) gives the same under-15-ft, rear-30% exemption to any accessory structure. Front setback: An ADU may not be placed in front of the main structure; the Board of Adjustment may grant a special exception (Sec. 51A-4.510(c)(2)(E)). District front yards: 25 ft in R-7.5(A), 20 ft in R-5(A) (Sec. 51A-4.112(f)-(g)). Note that garage conversions may be exempt from setback requirements if the existing structure is already within the setback area.
One off-street space, waived within 1,200 ft of a DART bus or transit stop; an overlay may reduce it when 75% of owners sign the petition or on the steering committee's recommendation (Sec. 51A-4.510(c)(2)(F)). On a Board of Adjustment approval, if no extra space is provided the board decides whether that creates a traffic hazard and may require one (Sec. 51A-4.209(b)(6)(E)(iii)(bb)). Many cities and states have been relaxing ADU parking requirements in recent years. In California, no additional parking is required for ADUs near transit.
Required while either unit is rented: the owner must live in the main house or the ADU during the tenancy, with up to one year's absence by director approval (Sec. 51A-4.510(c)(4)). Board of Adjustment approvals add a recorded owner-occupancy deed restriction and annual registration in the single-family rental program, $74 a year from Oct 1, 2025 (Sec. 51A-4.209(b)(6)(E)(iii)(cc); Sec. 27-31(e)(3)). Note that owner-occupancy rules vary by state law — California and several other states have eliminated this requirement for standard ADUs.
The ADU permit review timeline in Dallas is typically Not published. Ch. 52 Sec. 302.1.1 requires a completeness check within 10 business days of filing; a Board of Adjustment case goes on a monthly docket after acceptance, so allow one to two months on that route before permit review. Confirm review times with Development Services, 214-948-4480. Plan check: $577 minimum residential plan review ($0.046 per sq ft, Ch. 52 Sec. 303.5.1.2), included in the permit figure above; each plan revision after issuance $100 per hour per trade; completeness check within 10 business days (Sec. 302.1.1). Pre-approved plans availability: None. Dallas publishes no pre-approved ADU plan set; the only expedited residential option listed on the Building Inspection Residential page is the Rapid Single Family VIP (RSVP) review.
Average ADU rental income in Dallas: 1-bedroom units rent for $1,300-$1,550/month, 2-bedroom units for $1,750-$1,900/month. Short-term rentals: Regulated separately. Every short-term rental must be registered with the city under Chapter 42B (Secs. 42B-4 to 42B-6, fees under Sec. 42B-5), and an ADU approved under Sec. 51A-4.510 or Sec. Expected ROI: 5-15% gross yield: $1,300-$1,900 a month on a $130,000-$320,000 build, before taxes, vacancy, financing and the annual $74 rental registration.
The minimum lot size for an ADU in Dallas is None ADU-specific (Sec. 51A-4.510 sets no lot minimum). The district minimum applies to the lot itself, for example 5,000 sq ft in R-5(A) (Sec. 51A-4.112(g)), and every roofed structure counts toward the district's 45% lot coverage cap in R-5(A) and R-7.5(A). This applies to detached ADUs — garage conversions and JADUs may have different or no lot size requirements.
Garage conversions are one of the most popular and affordable ADU options. In Dallas, a garage conversion typically costs $30,000-$100,000. The key advantages are lower cost (no foundation work), potential setback exemptions, and faster permitting. Read our complete garage conversion guide.
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