Keller, TX Accessory Structures: Garage Conversions (2026)

Keller regulates garage conversions through the zoning code off-street parking requirements and the building code. Attached garages in single-family residential districts count toward the minimum required covered off-street parking for the dwelling, typically two covered spaces. Converting a garage to living space, a home office, or a bedroom therefore requires a replacement covered parking solution, most often construction of a new attached or detached garage or carport that matches architectural standards. A building permit is required for any interior conversion that includes framing, insulation, electrical, mechanical, or plumbing work, along with any window or door replacement in the former garage opening. Conversions must meet energy code, egress, and ceiling height standards to be classified as habitable space. If a second kitchen or independent entry is added the conversion can cross into ADU territory that Keller zoning does not broadly permit. HOA covenants in most Keller subdivisions prohibit garage conversions outright because of the resulting loss of covered parking and potential street-parking impact. Illegal unpermitted conversions are a frequent issue on resale, when inspectors or buyers identify converted space that was never permitted, and the fix is typically either reversal to garage use or a retroactive permit with corrections.