The average American home has ballooned over the years, growing in the Northeast from an average of around 1,600 square feet in 1973 to more than 2,600 square feet in 2010, according to the U.S. Census Bureau.

But these days, small houses are in the spotlight. The tiny house movement, centered on mostly mobile spaces that are smaller than 400 square feet, is sweeping the country (see sidebar) and HGTV reality show “Tiny House Hunters” follows people looking to downsize.

We’ve rounded up several homes for sale in Nassau and Suffolk counties that are about 1,000 square feet or less — tiny by Long Island standards — and asked the sellers about the advantages that come with living small.

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