How Dallas Handles Accessory Structures: A Practical Guide

Dallas maintains 206 local ordinances across all categories, and 4 of those deal specifically with accessory structures. Here is a breakdown of what the city actually requires, what is prohibited, and where Dallas falls on the strict-to-permissive spectrum compared to other cities.

ADU Rules

Dallas allows accessory dwelling units, garage apartments and similar rentable second units, only inside a neighborhood-petitioned ADU overlay under Sec. 51A-4.510. Detached units run 200 to 700 square feet, must sit behind the main house, and cannot exceed one story.

Key details: Governing section: Dallas Development Code Sec. 51A-4.510. Requires: City Council-approved ADU overlay district. Detached ADU floor area: 200 sq ft minimum, 700 sq ft or 25% max. Max stories: One story. Parking: 1 space; 0 within 1,200 ft of DART stop.

Building or renting out a second dwelling unit on a single-family lot outside an approved ADU overlay is a zoning violation enforced by Dallas Code Compliance /Building Inspection, treated the same as any unpermitted use or structure: a stop-work order, a notice of violation, and Class C misdemeanor citations of up to $2,000 per day for a continuing violation are possible. Exceeding the floor-area or height caps inside an approved overlay, or placing the ADU in front of the main house without a Board of Adjustment special exception, is also cited as a zoning violation.

This is one of the stricter rules in Dallas's municipal code. If you are unsure whether your situation complies, it is worth checking with the city before proceeding.

ADU Rental Restrictions

A Dallas accessory dwelling unit that is rented out must be registered in the city's single family rental program, and Sec. 51A-4.510(c)(1)(B) bars ever selling the ADU separately from the main house.

Key details: Registration rule: Sec. 51A-4.510(c)(5): rental unit must register. Separate-sale ban: Sec. 51A-4.510(c)(1)(B): ADU can't be sold apart from house. Advertising: ADU exempt from Sec. 51A-4.209(b)(6)(E)(vii)(bb) ad ban. Program: City single family rental program.

Renting an ADU without registering it in the city's single family rental program, or attempting to sell an ADU as a separate parcel from the main house, violates Sec. 51A-4.510(c)(1)(B) and (c)(5) and is enforced by Dallas Code Compliance as a zoning violation, carrying a notice of violation and Class C misdemeanor fines of up to $2,000 per day for a continuing violation.

ADU Owner Occupancy

Inside a Dallas accessory dwelling unit overlay, the property owner must live on-site, in either the main house or the ADU, whenever one of the two units is rented out, per Sec. 51A-4.510(c)(4).

Key details: Governing section: Dallas Development Code Sec. 51A-4.510(c)(4). Core rule: Owner must reside in main house or ADU while renting the other. Absence exception: Up to one year with director approval. Applies only within: An approved ADU overlay district.

Renting out both the main house and the ADU while the owner lives elsewhere, without director-approved absence, breaches Sec. 51A-4.510(c)(4) and is enforced as a zoning code violation by Dallas Code Compliance, subject to a notice of violation and Class C misdemeanor citation with fines up to $2,000 per day the violation continues.

Shed & Carport Rules

Dallas caps backyard sheds and other accessory structures at the height of the main house and limits their floor area under Development Code Sec. 51A-4.209(b)(6)(E)(vii). One shed cannot exceed 25% of the house's floor area, and all accessory structures combined cap out at 50%.

Key details: Height limit: Cannot exceed the main building's height. Single structure floor area cap: 25% of main building floor area. Combined structures floor area cap: 50% of main building floor area. Design-match exemption: Structures 200 sq ft or less exempt. Governing section: Dallas Development Code Sec. 51A-4.209(b)(6)(E)(vii).

A shed or accessory structure that exceeds the main building's height, or that pushes individual or combined accessory floor area past the 25%/50% caps, is a zoning code violation subject to a stop-work order or removal requirement through the city's code compliance process. Compatibility disputes over exterior materials on structures larger than 200 square feet can be appealed to the Board of Adjustment, which weighs the property owner's proof of compatibility.

The Bottom Line

Dallas's accessory structures rules are a mixed bag. Some areas are strict, others are relaxed, and the details matter. The best approach is to check the specific rule that applies to your situation rather than assuming Dallas is broadly strict or permissive.

All of the above reflects Dallas's municipal code as of our last review. If you need specifics on fines, exemptions, or filing requirements, the detailed ordinance pages linked above have the full breakdown.