Most carrier estimates aren't wrong on purpose. They're written fast, off a roof the adjuster walked once, in a price list that doesn't always match how a roof actually goes back together. The work is real and code-required — it just never made it onto the scope.
If you only build off what the adjuster handed you, you're pricing a roof you're not actually installing. Here are the line items that go missing most, why they get dropped, and how to catch them before the job is signed.
Why these items disappear in the first place
An adjuster is scoping a lot of roofs in a day. They measure the field, count the squares, and write the obvious stuff. The detail work — the accessories, the code items, the access conditions — is exactly the stuff that's easy to skip when you're moving fast and not the one installing the system.
That's the whole game with supplement line items: you're not inventing work, you're documenting work the estimate already implies but didn't price. Catch it at inspection, photograph it, and you've got a clean supplement instead of an argument three weeks later. Our supplement engine exists to surface these gaps automatically, but you can train your own eye for them right now.
A note before the list: every item below is priced off the regional Xactimate price list, so the dollar amounts vary by market and by month. Don't quote numbers from this post — pull current pricing for your area.
The accessory items that get dropped
These are the small-line, high-frequency misses. None of them is huge on its own. Together, across every job, they're real money.
Ridge cap. Field shingles are not ridge cap, and most manufacturers won't warranty a roof that uses cut three-tabs as cap. If the estimate pays for the field but pays ridge as "cut from field shingle," you're owed the upgrade to a proper ridge cap line — especially on any architectural or designer system. Measure your ridge and hip linear footage and make sure it's all there.
Starter strip. Same story at the eaves and rakes. Manufacturer-specified starter strip is a separate, code-and-warranty-relevant line item, not something you fabricate on site for free. Carriers frequently leave it off or only pay eave starter while ignoring the rakes.
Drip edge. Drip edge is code-required in many jurisdictions, and it runs both eaves and rakes. A surprising number of estimates either omit it entirely or pay for eave drip and skip the rakes. Pull your local code, then measure the full perimeter.
Step flashing and counterflashing. Anywhere the roof meets a wall — sidewalls, chimneys, dormers — you need step flashing, and reusing old flashing is rarely acceptable on a full replacement. This one hides because the adjuster scoped from the ground and never saw the wall details. Photograph every wall intersection.
The code and underlayment items
These are the ones that get expensive, and they're also the ones with the strongest justification because they're tied to code or manufacturer spec.
Ice-and-water shield. In a lot of cold-climate jurisdictions, ice-and-water shield is code-required at the eaves to a specified distance past the interior wall line, and it's commonly specified in valleys and around penetrations regardless of climate. The estimate may pay synthetic underlayment for the whole roof and quietly omit the ice-and-water at the eaves and valleys. If your code requires it, that's not optional and not a favor — cite the code section.
Underlayment upgrades and full replacement. On a tear-off you're installing new underlayment across the whole deck. If the estimate only pays felt in patches, or assumes existing underlayment stays, that's a miss.
Decking and deck repair. Carriers won't pay to replace good decking, and they shouldn't. But on a tear-off you almost always find rot, delamination, or spacing that won't hold a nail. Build the supplement after tear-off with photos and board counts. This is a document-it-when-you-find-it item, not a guess-up-front item.
The labor and access items everyone underprices
This is where roofs that look identical on paper actually differ — and where flat, generic estimates leak the most.
Steep and high charges. Roof pitch drives labor. Anything in the steep range (think 7/12 and up, with separate tiers as it gets steeper) carries a steep charge, and a tall roof carries a high/two-story charge. If the adjuster defaulted to standard pitch or a single story and your roof is neither, you're underpaid on the single biggest variable in the whole estimate. Verify the pitch and the stories on every estimate.
Tear-off by layer. Removal of a second or third layer is its own line. If there are two layers up there and the estimate pays one removal, fix it.
Dumpster, dump fees, and haul-off. Disposal is a real cost that's easy to leave off, and dump fees move around by market.
Detach and reset. Satellite dishes, solar attachments, gutters, gutter guards, lightning protection, antennas — anything that has to come off and go back on is a detach-and-reset line. Walk the roof and inventory what's mounted to it.
Overhead and profit
If the job involves enough trades and enough coordination, you may be owed overhead and profit — the "10 and 10" — on top of the trade pricing. O&P is its own subject with its own test for when it applies, and we cover that in depth in the overhead and profit guide. For now, just know it's a line that's frequently omitted on roofs that legitimately qualify, and it's worth checking on every multi-trade loss.
A quick field checklist
Run this against every carrier estimate before you accept the scope:
| Category | Check that the estimate includes |
|---|---|
| Ridge/hip | Ridge cap as a real line, not cut-from-field |
| Eaves/rakes | Starter strip on all eaves and rakes; drip edge full perimeter |
| Walls | Step flashing and counterflashing at every intersection |
| Underlayment | Full underlayment replacement; ice-and-water per code |
| Deck | Repair allowance documented after tear-off |
| Labor | Correct pitch tier and story/high charge |
| Removal | Tear-off priced by number of layers |
| Disposal | Dumpster and dump fees |
| Accessories | Detach-and-reset for every mounted item |
| Markup | O&P where the job qualifies |
The pattern across all of it: the adjuster scoped the roof they could see from the ground in the time they had. Your job is to scope the roof you're actually going to build, document the difference with photos and code citations, and submit it clean.
Catch it once, catch it every time
The roofers who never miss these aren't smarter — they're systematic. They inspect against a checklist, they photograph the detail conditions, and they reconcile every estimate line by line before they accept it. If you want the full mechanics of turning these gaps into approved dollars, start with how to write roofing supplements that get approved and the complete guide to roofing supplements.
Do that on every job and the "small" items you used to eat become a normal, defensible part of every scope you submit.
This post is general information for contractors, not legal or insurance advice. Code requirements and price lists vary — confirm against your local code and current Xactimate pricing.