Gather the basic information
Note the approximate age of the roof, previous work and visible problems. Take photos from the ground. Do not climb onto the roof to document it.
Compare the same scope
Ask for clear information about scaffolding, removal, underlay, metal details and waste disposal. Proposals are easier to compare when the scope is equivalent.
Ask about the details
How is the house protected during work? What happens if hidden damage is found? What documentation do you receive afterwards?
