ADU rules in Mansfield, TX — also called accessory dwelling unit regulations or granny flat ordinances — cover setbacks, owner-occupancy, parking, and permit requirements.
Mansfield regulates Accessory Dwelling Units under Mansfield Zoning Ordinance Chapter 155, specifically §155.099(B)(35) (Special Conditions), with ADUs permitted where specified in §155.054 (Permitted Uses), §155.072 (Downtown District), and §155.073 (South Mansfield Form-based Development District). ADUs are capped at 1,000 sq ft or 75% of the primary dwelling's habitable area, whichever is greater.
Mansfield Code of Ordinances §155.099(B)(35) authorizes ADUs to increase housing options without compromising neighborhood character. The maximum habitable area of an ADU is 1,000 sq ft or up to 75% of the primary dwelling's habitable area (whichever is greater). The combined floor area of all accessory buildings/structures plus the ADU cannot exceed 2,500 sq ft, and the combined area of the primary residence plus accessory structures plus ADU cannot exceed the maximum lot coverage percentage allowed for the underlying residential zoning district. ADUs are not by-right in all single-family zones — they are permitted where specifically listed in the Permitted Uses table (§155.054) and in the Downtown District and South Mansfield Form-based District. Building permits are issued by the Mansfield Building Safety Department after zoning verification, and construction must meet the locally adopted International Residential Code.
Constructing an ADU outside its permitted zones, exceeding the 1,000 sq ft / 75% size cap, or exceeding the 2,500 sq ft combined accessory area is a violation of Mansfield Code Chapter 155 enforced by Mansfield Code Compliance. Violators face stop-work orders, citations under §10.99 (general penalty up to $2,000 per offense for zoning violations), and required restoration or after-the-fact permitting.
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Side-by-side rule comparisons with other cities in Tarrant County.
See how other cities in Tarrant County handle adu rules.
See how Mansfield's adu rules rules stack up against other locations.
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