An asphalt shingle roofing system ought to be changed every 20 years. Consider updating to a steel roofing system that lasts 40 to 70 years. Including plumbing, electric, and stairways increase the general expenses. The ordinary cost to complete an attic room is $25,000 to $75,000 to convert it into living room. Renovating an already-finished attic expenses $10,000 to $30,000.
