What Every Roofing Estimate Should Spell Out (Before You Sign)

What a roofing estimate should include, line by line

A roof is not one thing you buy. It is a stack of components and a sequence of work, and a proper estimate breaks it apart so you can see each piece. When the scope is written out, you can tell what you are paying for, you can compare apples to apples between contractors, and you have something to hold the crew to once work starts.

At a minimum, a residential estimate should name the following:

• Tear-off or layover, and how many existing layers come off
• A decking inspection, plus a per-sheet allowance for any rotted plywood that gets replaced
• Underlayment (what kind, and where ice-and-water or extra protection goes)
• Flashing at walls, valleys, chimneys, and skylights, and the metal it is made of
• Drip edge, ridge venting, and intake venting
• Fasteners (the nails or screws, and the metal they are made of)
• The named shingle, membrane, or metal panel, not just "high-quality materials"
• Disposal and dump fees, the building permit, and final cleanup including a nail sweep
• The labor warranty term, in writing

If you want the full walk-through of every one of these lines and what each is for, we kept a longer companion guide that reads an estimate from top to bottom. This post is the short version: what matters most, and what should make you pause.

Tear-off versus layover, and the decking question

Two of the biggest variables in any estimate are whether the old roof comes off and what happens if the wood underneath is rotten. A layover means new shingles go right over the old ones. It is cheaper on paper, but it traps an existing problem under a new surface, adds weight, and almost always shortens the life of the new roof. On a coastal home that already sheds a lot of weather, we generally want the old material gone so we can see and protect the deck. A real estimate states clearly whether it is tear-off or layover, and how many layers are being removed.

Then there is the decking. Nobody can see the condition of the plywood under your shingles until the roof is open, so honest contractors do not pretend to. Instead they write in an allowance: a stated per-sheet price for replacing any rotted decking they find, so you already know the cost before the crew is standing on your roof with leverage. A vague "decking extra if needed" with no number is how a low bid turns into a surprise invoice.

The coastal detail: stainless written in, not assumed

This is the line item that separates a roofer who understands the coast from one who treats Florence like it is Bend. Salt air corrodes ordinary metal. Standard galvanized or electro-coated fasteners and flashing can rust on a home near the water long before the shingles wear out, and when the fasteners go, the roof goes with them. The right answer on the coast is stainless steel components: stainless fasteners and corrosion-resistant flashing and detailing that hold up in a marine climate.

Here is the catch: stainless is rarely assumed, and it is usually not the default a national supplier ships. So it has to be written into the estimate on purpose. If you live anywhere along the coast from Newport to Coos Bay and the estimate does not name stainless components, ask why. The answer tells you a lot about whether the contractor actually builds for where you live. On a PVC or TPO membrane roof, for example, we spec stainless components as a matter of course, and we would rather put that in writing than leave you guessing.

Why a one-line price is a warning sign

An estimate that says "Roof: $X" and nothing else is not a deal. It is a blank check with a number on it. You cannot tell whether tear-off is included, whether the deck gets inspected, what underlayment goes down, what the flashing is made of, or what happens when the crew finds rot. Every one of those unknowns is a place where corners can get cut after you sign, and you would have no written scope to point to when you object.

Sometimes a one-line bid is just sloppy paperwork. Often, though, it is how a low number gets to be low: things were left out. A bid that lands far below the others usually means something is missing from the scope, not that one contractor found a magic discount. The fix is simple. Ask them to show you, in writing, exactly where their price differs from the others. A contractor who builds honestly will happily put it on paper. One who cannot is telling you something too.

How to compare two estimates fairly

Once you have the line items in front of you, comparing bids stops being about who is cheapest and starts being about what you are actually buying. Walk both estimates through the same questions:

1. Do both include tear-off, or is one quietly a layover?
2. Do both state a per-sheet decking allowance, or is one leaving rot as a surprise?
3. Do both name the actual product (for example Owens Corning TruDefinition Duration architectural shingles or 24-gauge standing seam), or does one just say "quality materials"?
4. Do both spell out stainless components for the coast, or is one assuming standard metal?
5. Do both include the permit, disposal, and cleanup, or has one left those off to lower the number?
6. Do both put the labor warranty term in writing?

When you line them up this way, a vague low bid usually stops looking like a bargain. The gap between the two prices tends to be the work that one of them left out. That is the whole point of reading on substance instead of the bottom line: it lets the missing pieces show themselves before you sign, not after the crew is on your roof.

How Pacific Peaks writes an estimate

We are a family-owned, locally owned roofer based in Florence, and we build for the coast we live on. Every estimate we hand a homeowner spells out the scope, the named materials, the coastal detailing, and the term of our own written 10-year workmanship warranty on the labor and installation, before you sign anything. The shingle or membrane also carries the manufacturer's separate material warranty on its own terms, and we keep those two things distinct so you know exactly who stands behind what.

We are licensed, bonded, and insured in Oregon (CCB #254443), and we manage the whole job and stand behind it, so every crew on your roof is held to our standards and overseen by us. You always know who is responsible: us. If you are weighing a stack of bids and one of them is a single line with a single number, send it our way. We will show you, on paper, what a real scope looks like.