How to evaluate a metal roofing quote

Two metal roofing quotes can look similar on the last page and describe completely different roofs. I have sat at a lot of kitchen tables with three estimates spread out, and the gap that worried the homeowner almost always turned out to be two different products, not two prices for the same one.

So here is how I would compare them — on what matters, in order, so price is the last thing you look at instead of the first. Work through every quote you have, one step at a time, and write down what each one says and what it leaves out. A blank is a finding.

One limit up front: this guide can tell you whether two quotes describe the same roof. It cannot tell you which roof your house needs. That takes someone on the roof and in the attic, and if a quote was written without either, that is the first thing you have learned about it.

1. Confirm the system type

   Standing seam, metal shingle, stone-coated steel, and exposed fastener are not the same product at different prices. They are different roofs that fail differently. A quote should say plainly which one it is.

   If it just says "metal roof," that is your first question. If it says "standing seam," ask which kind — a mechanically seamed panel and a snap-lock panel are both standing seam, and they do not behave the same on a low slope or in wind-driven snow. How the seam is formed matters.

   Write the system down for each quote. If they do not match, nothing below is comparable until they do.

2. Check the pitch against the system

   Your roof's slope rules some systems out before anyone talks about color. An exposed-fastener panel should not go on under 4/12 — we will not install it there. An interlocking metal shingle wants 3/12 or steeper. Low-slope porch roofs and additions need a mechanically seamed panel rated for that pitch, not a standard profile stretched past its minimum.

   If a quote puts a system on a pitch that system does not support, the conversation with that contractor is over. No price makes that a good roof.

3. Check the gauge and the substrate

   Thinner metal costs less and dents more easily. The quote should state the gauge and what the steel is — the metallic coating on the base sheet is what keeps it from rusting from underneath. This is where a lower number sometimes hides a lighter roof. If the quote does not say, ask, and notice whether the answer comes easily.

4. Verify the coating, not just the color

   The finish is what you look at for decades, and it is where cheap panels are cheap. A PVDF coil coating — the Sherwin-Williams coatings we use are that type — holds color and resists chalk and fade far better than a cheaper paint system that looks identical on day one. Ask what coating is specified. A color name is not an answer.

5. Ask who certifies the crew

   This is the one most homeowners skip, and it is the one I would not. Is the crew manufacturer-certified for the system being installed — not the company in general, the people on your roof?

   Certification is not a marketing badge. It is what allows a manufacturer to stand behind the workmanship as well as the material, because they will only back an install done to their spec by someone they have trained. Without it you have a warranty on the metal and nothing on the install. Nearly every failure I get called about — sealant where flashing belonged, a panel pinned so it cannot move, screws overdriven — is workmanship.

6. Read the warranty scope, not the headline

   Material only, or material and workmanship? Prorated or not? Transferable to the next owner or not? For how long, and what voids it?

   A lifetime material warranty means little if the installation is not covered and the coverage does not survive a sale. And be honest with yourself about what no warranty can do: it is protection against defects and installation failure, not a substitute for the occasional look at your roof.

7. Read what is included, and what is assumed

   Tear-off and disposal, deck repair and how it is priced if the tear-off finds rot, underlayment across the field and self-adhered membrane at the eaves and valleys, flashing rebuilt in formed metal, ventilation, snow retention over doorways and walks, permits where required, cleanup and a magnet sweep. Each of those should be on the page.

   The cheapest quote is often the one that leaves the most off the page, and what is left off comes back as a change order. Pay particular attention to the deck. Any number written before tear-off has an assumption inside it. Ask what that assumption is and what happens if it is wrong — a unit price for deck replacement is the honest way to write it.

8. Notice what the contractor asked you

   Did anyone get into the attic? Did anyone ask about your soffit intake and your ridge? A roof that cannot breathe cooks its own decking and shortens whatever goes on top of it. A contractor who never mentions the attic is quoting a product, not a roof.

9. Then, and only then, compare price

   Once the systems, pitch, gauge, coating, certification, warranty scope and inclusions match across every quote, the prices are finally comparable. Often the gap you were worried about turns out to be two different roofs, and the decision is about which roof you want, not which number is smaller.

   If the gap survives all of that, it is worth asking the lower bidder what they would leave out to hit it — and the higher bidder what you are getting for the difference. Both answers are informative. Metal costs more than asphalt up front because of the material, the coating and the skill it takes, and the spread between two metal quotes is usually in the system, the metal itself, what goes under the panel, the flashing detail, and who is on the roof.

   Here is the tradeoff you are really weighing: a quote that is thin on paper is cheaper today and more expensive later, in change orders or in a roof that asks for attention early. A quote that is thorough costs more to read and less to live with. Neither is automatically right for you — but you should be choosing it knowing which one it is.

   Now you have enough information to compare any two quotes you are handed, including ours.