Overhead sails are growing in popularity due to style, ease of installation and their reasonable cost, said Allyson Case Anderson, who runs Integro Builders, based in Chicago. Usually 3- to 6-foot triangles of canvas, the sails are hitched to permanently installed posts that typically pass muster with condo boards, she said, and that don’t infringe on close neighbors in tight city neighborhoods. A typical installation costs about $6,000, she said.
