Farmersville, TX Accessory Structures: ADU Owner Occupancy (2026)

Section 77-66(b) of the zoning ordinance treats a garage apartment or guest house as an accessory dwelling unit that is allowed only as an incidental use on the same lot or tract as the main dwelling, and only when the main structure is owner occupied and the accessory unit is used by the same person or persons of the immediate family. A garage apartment must be built attached to a garage, either above or adjacent to it, while a guest house must sit to the rear of the main dwelling, separate from it.

An ADU can be constructed only after the owner obtains a building permit under subsection (b)(2); it must follow the same setbacks as the main structure, and it cannot exceed 35 feet in height or two stories. Floor area is capped at 1,100 total square feet, with no more than 550 square feet on a second story and a 350 square-foot minimum, and the detached unit's floor area cannot exceed 50 percent of the main house's floor area. Subsection (b)(6) adds that the unit may contain no more than one bedroom, one kitchen or one bathroom, that parking must sit behind the front yard, and that where the main house is a significantly important building or sits in a historically significant area, the ADU's roof pitch, facades and window proportions must match the main house.