The natural inclination is to find the lowest cost. While cost should always be a factor, the most important part of the decision should be appreciable value and your return on investment. Will the contractor give you a fair estimate and one that handles the cost of quality products and professional installation? Does the estimate encompass all facets of your roof replacement including ventilation, protective coverings, fasteners, permits and inspections, flashing as well as removal and dumping of the old roofing substance and delivery of brand-new materials? Does the estimate encompass all labor, project management and coordination? Are there allowances for unforeseen expenditures such as repair or replacing the underlying wood structures? Peace of mind, quality substances and complete project specs are as important and will provide you with a roof that lasts a lifetime.