Keystone Building Services is your go-to builder in the Penrith Nepean area. We specialise in Ground Floor Additions, Second Storey Additions, Home Extensions, Home Additions and Renovations. We are based in Penrith and service the Greater Western Sydney, Inner West Sydney, The Hills District, Blue Mountains, North Western Suburbs, Cranebrook, Cambridge Park, Emu Plains, Blaxland, Werrington, Castlereagh, Leonay, St Marys, Mulgoa, Mount Druitt, St Clair, Parramatta, Greystanes, Kellyville, Kingswood, Glenmore Park, Eastwood, Ryde, Colyton.