SEATTLE and SAN FRANCISCO, July 31, 2017 /PRNewswire/ -- Nationally, U.S. homeowners can expect to spend $9,080 a year on average in hidden costs related to owning and maintaining a home, according to a new analysis from Zillow® and Thumbtacki. Since nearly half (47 percent) of home shoppers today are first-time buyers, many of these extra costs may come as a surpriseii.