On a Saturday in September, more than 125 volunteers showed up with tools in hand and built six new 16-by-20-foot houses for a group of formerly homeless men. It was the beginning of Second Wind Cottages, a tiny-house village for the chronically homeless in the town of Newfield, N.Y., outside of Ithaca. On January 29, the village officially opened, and its first residents settled in. Each house had cost about $10,000 to build, a fraction of what it would have cost to house the men in a new apartment building. The project is part of a national movement of tiny-house villages, an alternative approach to housing the homeless that's beginning to catch the interest of national advocates and government housing officials alike. For many years, it has been tough to find a way to house the homeless. More than 3.5 million people experience homelessness in the United States each year, according to the National Law Center on Homelessness and Poverty. But Second Wind is truly affordable, built by volunteers on seven acres of land donated by Carmen Guidi, the main coordinator of the project. The retail cost of the materials to build the first six houses was somewhere between $10,000 and $12,000 per house, says Guidi. But many of the building materials were donated, and all of the labor was done in a massive volunteer effort. "We've raised nearly $100,000 in 100 days," he says, and the number of volunteers has been "in the hundreds, maybe even thousands now." The village will ultimately include a common house, garden beds, a chicken coop, and 18 single-unit cottages.