Broad labels such as premium shingles or metal roofing do not establish equivalent products or assemblies. Similar-sounding estimates can include different underlayment, attachment, flashings, and warranties. The material description needs enough detail for a fair comparison.
What to do next
Ask each bidder to identify exact products and accessories. Create a side-by-side scope list before comparing totals. Where a product may be substituted, require a defined review process so price changes do not quietly change the promised system.
Related Perkins guidance
Contact Perkins Roofing to discuss your roof and the appropriate next step.