"That's the No. 1 issue — zoning," said Steven Harrell, owner of Tiny House Listings (tinyhouselistings.com), where 20,000 to 50,000 people visit per day to check out tiny houses for sale. "There are a lot of people advocating, 'Hey, what's the big deal? Why don't you ease square-foot [regulations]?' Times have changed, the economy has changed, people are having to make choices. And tiny houses are one of them."