Cornerstone Roofing And Construction Co. Home ›› Local Listings ›› WA ›› Perth ›› Cornerstone Roofing And Construction Co. WA Professional Services Perth, WA 6028 Cornerstonelofts419910416https://www.cornerstonelofts.com.au A loft conversion is a great way to improve home value and to add a new home without adding onto the house. Cornerstone Roofing & Construction can help make this happen to the satisfaction of the home owner.