Grand Designs’ Kevin McCloud warns one mistake can devalue your home more than anything

Grand Designs presenter Kevin McCloud has named what he believes is one of the worst things homeowners can do to affect their property value.Kevin McCloud has identified “one of the worst things” homeowners can do to diminish their properties’ value. Kevin, who has been a part of Channel 4’s Grand Designs since 1999, recently spoke about one of the most common problems seen on the TV show.