How do people on Extreme Home Makeover afford their new property tax?

Seems like a cruel joke: You're a struggling family, your community comes together and demolishes your close-to-codemned home, donated labor sweeps in and builds you a new house with a rustic kitchen complete with hood and island, a rugged yet metrosexual man named after a neck accessory unveils your new abode, you move in, your property gets assessed, your taxes skyrocket, and then what? You get evicted from your house?