Experts Say Zoning Changes Are Most Effective Path to Boost Housing Supply for a More-Balanced Market A Zillow survey of economists and other real estate experts finds high costs are expected to slow construction and may lower homeownership among today's 30-somethings - The expert panel's prediction for home price growth is the most optimistic ever in the quarterly survey that dates back to 2010. - The panel expects new construction to slow in the coming years, with high costs as the main barrier. But last quarter, the same panel predicted total inventory would rise later this year thanks mainly to more existing homes being listed for sale.