Rowlett, TX Accessory Structures: ADU Rules (2026)
ADU rules in Rowlett, TX, also called accessory dwelling unit regulations or granny flat ordinances, cover setbacks, owner-occupancy, parking, and permit requirements.
Key Facts
- Allowed districts
- SF-40, SF-20, MF-2F, MF-S (by right)
- Ownership rule
- Same owner as principal house required
- Utility rule
- Must share the house's utility meter
- General accessory ban
- Other accessory buildings can't be dwellings
- Max zoning fine
- Up to $2,000 per § 1-13(a)
Summary
Rowlett allows a garage apartment as an accessory dwelling by right in the SF-40, SF-20, MF-2F and MF-S districts under City Code § 77-303(B), but it isn't a free-standing rental unit: § 77-303(C)(4)-(5) requires the garage apartment and the main house to share the same owner and the same utility meter, and general accessory buildings otherwise cannot be used as a dwelling at all.
In addition, residential accessory uses shall comply with the following standards.3.Dimensional standards for residential accessory buildings and structures.(a)Size, height and building materials...5.No accessory structure or portion of an accessory structure shall be used as a dwelling...4.Same ownership required. The principal use and the accessory use shall be under the same ownership.5.Same utility meter required. The principal use and the accessory use shall utilize the same utility meter.
Official source re-checked September 7, 2026: no newer edition of the code had been published (publisher’s edition: Code of Ordinances: Supplement 29).
Full Breakdown
4-1 as an accessory use allowed by right (marked "A") in the SF-40, SF-20 group, MF-2F and MF-S residential districts; it is not an allowed accessory use in SF-5, MF-TH, MF-U or any nonresidential or mixed-use district covered by the table. Section 77-303(C) then layers general standards on every accessory use and structure in the city, including a garage apartment. 4-1 as its own listed accessory use. Because it is separately listed, a garage apartment escapes that dwelling ban, but two conditions still bind it directly.
Section 77-303(C)(4) requires "same ownership": the principal house and the garage apartment must be held by the same owner, which forecloses selling the apartment as a separate condo-style unit or subdividing title. Section 77-303(C)(5) requires "same utility meter": the apartment cannot carry its own electric, water or gas meter separate from the main house, which in practice prevents treating it as an independently billed rental. A garage apartment must also meet the dimensional standards of Chapter 77-400 and the general accessory-structure rules in § 77-303(C)(2)(a), sits on the same lot as the principal dwelling under § 77-303(C)(2)(b), and any conflict between these accessory-use standards and another part of the Code is resolved in favor of this section. 4-1 before design work begins.
Violations & Fines
Building or operating a garage apartment that violates these standards, such as installing a separate utility meter or transferring ownership apart from the main house, is a Code violation under § 77-1005(A)-(B), enforced by the city manager's designee. Each day the violation continues is a separate offense under § 77-1006 and § 1-13(b), and general Code violations carry fines up to $2,000.00 for zoning matters under § 1-13(a); the city may also withhold or revoke building permits and certificates of occupancy under § 77-1006(C)-(D).
Frequently Asked Questions
Can I rent my Rowlett garage apartment out separately from the main house?
Which Rowlett zoning districts allow a garage apartment?
Do other accessory buildings in Rowlett get to be used as living space?
Sources & Official References
Other rules in Rowlett
How Rowlett compares: Easiest Cities to Build an ADU·Texas rules heatmap·Compare Rowlett to another location·View the Texas accessory structures overview
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How other cities in Dallas County handle adu rules.