Most Dallas homes from the 1960s through 1990s have standard 60-inch alcove bathtubs that a walk-in tub can replace without major structural modification. The existing plumbing rough-in (drain location and water supply) usually accommodates a walk-in tub with minor adjustments. This keeps installation costs lower than new-construction bathroom modifications.
For Dallas ranch homes (common in Lake Highlands, Richardson border, and East Dallas), the single-story layout means no stairs to navigate between the bedroom and bathroom, which is already ideal for aging in place. Adding a walk-in tub to the existing bathroom completes the accessibility picture.