How to Compare Roof Replacement Estimates

How should you compare roof replacement estimates?

Compare roof estimates on scope, not just price. Two bids can look thousands of dollars apart simply because one includes things the other leaves out: tear-off, new flashing, ventilation, proper disposal, cleanup, and warranty coverage. The goal isn’t to find the lowest number; it’s to make sure you’re comparing the same work. This checklist shows you how.

Why roof estimates vary so much

When two estimates differ, it’s usually because they cover different scopes. One contractor may plan a full tear-off while another plans to roof over the existing layer. One may include new flashing and upgraded ventilation; another may reuse what’s there. One may bury disposal and cleanup in the price; another may not mention them. A lower number often means less work, not a better deal. Getting every estimate in writing is what makes a fair comparison possible.

The roof estimate comparison checklist

Line each estimate up against the the same items:

• Tear-off vs. layover. Is the old roof being removed, or roofed over? Removal costs more but lets the crew inspect and repair the decking.
• Disposal. Is hauling and disposing of the old material included?
• Underlayment. What’s being installed beneath the shingles, including code-required ice-and-water barrier along the eaves?
• Flashing. Is new flashing included around chimneys, valleys, and vents, or is old flashing being reused?
• Ventilation. Is attic ventilation being evaluated or improved? Poor ventilation shortens roof life.
• Cleanup. Is thorough cleanup (including nail sweeping) part of the price?
• Warranty. What’s covered, for how long, and by whom?

Known scope vs. “what if we find something”

A good estimate separates the work that’s planned from what happens if hidden conditions turn up, like damaged decking that’s only visible once the old roof comes off. Ask each contractor how they handle unforeseen conditions: Is there an allowance? Will you be shown the issue and given a written change before extra work happens? A written answer here protects you from surprise costs later.

Material warranty vs. workmanship warranty

“Warranty” can mean two different things, and they aren’t interchangeable. The material warranty comes from the shingle manufacturer and covers the product. The workmanship warranty comes from the contractor and covers the installation. A strong roof has both. When comparing, don’t assume two estimates offer identical coverage just because both say “warranty.” Ask what each one actually covers and for how long.

Questions to ask before you sign

• Is this a full tear-off, and does it include new flashing and ventilation?
• How do you handle unforeseen conditions like decking damage?
• What’s the material warranty, and what’s your workmanship warranty?
• Is disposal and cleanup included?
• Can I see all of this in a written proposal?

For more on vetting the contractor behind the estimate, see our guide on choosing a roofing contractor in Minnesota. And if you want to understand what actually happens during a quality install, our guide on what quality roof installation includes breaks it down.

frequently asked questions

Get a clear, written estimate

The easiest estimate to compare is a clear, written one based on your actual roof. Archway Contracting provides written estimates that spell out scope, materials, and warranty, so you know exactly what you’re comparing.

Request a free inspection and a written estimate based on your roof.