Welcome to Roof Restoration Perth! There is a few things you should consider before you start calculating your roof restoration cost. Material cost is one factor, and another important consideration is the condition of the existing roof. Removing old materials and fixing support structure may be additional cost to your overall budget. My best tip for you is that you should not do anything by yourself, for one simple reason … your home insurance may be null and void if your roof is not professionally installed complying with Australian Standards and The Building Code of Australia.