The answer to 'cost to replace roof installation' is that the cost can vary widely depending on several factors, but typically ranges from $10,000 to $30,000 for a full roof replacement on an average-sized home. The main factors that influence the cost include the size and pitch of your roof, the type of roofing material (e.g. asphalt shingles, metal, tile), the complexity of the job, your location, and the experience level of the roofing contractor.
It's essential to get multiple quotes from local, reputable roofing companies to understand the range of costs in your area. The cheapest option may not always be the best, as quality of materials and workmanship can vary significantly. Be sure to compare apples to apples when reviewing quotes and don't be afraid to ask detailed questions about the proposed scope of work.