Rowlett, TX Accessory Structures: ADU Rules (2026)

Unlike California or some other states, Texas does not impose a statewide accessory dwelling unit law, so whether an ADU is allowed in Rowlett depends solely on the Rowlett Development Code (Chapter 77). The City's published Accessory Building Regulations (implementing Development Code Section 77-303) are explicit on item 5: "No accessory structure or portion of an accessory structure can be used as a dwelling." That language means a detached backyard building (shed, garage, workshop) cannot be converted into an independent rental or living unit by right. Rowlett's residential zoning districts (SF-40 through SF-5) are described as accommodating "single-family residential development and appropriate accessory uses," not second dwelling units. Any use that is not allowed by right or listed as a Special Use Permit (S) in the Development Code's Table of Allowed Uses is not eligible in that district; a separate dwelling unit such as a garage apartment would therefore require checking the Table of Allowed Uses and likely a Special Use Permit or rezoning approved by City Council, which the Zoning & Development Handbook describes taking about two months. Homeowners considering any second living unit, garage apartment, or guest house should request a pre-development meeting or zoning verification letter from the Community Development Department before building.