A second-story addition turns a 1,600 square foot Fort Worth ranch into a 3,200 square foot two-story home — same lot, same neighborhood, same bones, but a fundamentally different house. Here's the honest 6th Ave Homes walk-through of feasibility, foundation reinforcement, design, permits, construction logistics, and the $250K to $700K realistic cost range for a Fort Worth second-story addition in 2026.