Despite regulatory efforts in Texas aimed at preventing the spread of "colonias"—self-help settlements with inadequate water and wastewater infrastructure—since the early 1990s hundreds of new self-help "model subdivisions" have formed throughout the state. Using aerial photography and parcel-level property records, I provide the first systematic analysis of these subdivisions. Their proliferation poses considerable challenges for local planners, and although most model subdivisions appear to have basic infrastructure, housing conditions are exceedingly poor because of the protracted nature of the self-help process. The study highlights the need for renewed attention by scholars, policymakers, and planners toward self-help settlements in Texas.