Houston is the largest city in Texas and one of the most geologically demanding plumbing environments in the country, built almost entirely on expansive clay soil that swells after rain and shrinks during drought, putting constant stress on slab foundations and the pipes buried beneath them. Inner Loop neighborhoods like the Heights, Montrose, and Timbergrove contain homes built in the early to mid-20th century, many still running on original cast iron drain lines and aging copper supply piping that has been flexed by decades of soil movement. The city's lack of conventional zoning has produced a dense mix of single-family homes, townhomes, and commercial build-outs on narrow lots, which creates access constraints for underground plumbing work. Outer Loop and near-suburb corridors like the Energy Corridor and the Northwest Freeway area carry a heavy commercial and industrial property load that generates consistent demand for commercial plumbing installation and commercial kitchen plumbing.