The fastest way to lose money on an insurance job is to treat the adjuster's estimate as your bid. It isn't a bid. It's the carrier's opening position, generated from a pricing database by someone who spent twenty minutes on the roof and has never had to source a crew in August. If you sign the scope and start ordering material, you've just agreed to build a roof for a number you didn't calculate.
Restoration work can be excellent business — the funding is verified, the homeowner isn't shopping four bids on price alone, and the volume comes in waves. But the discipline required is different from retail. On a retail job you build a price. On an insurance job you build a price and then prove it. Contractors who skip the first half and only do the second half spend their whole season fighting for supplements on a job that was underwater the day it was written.
This is the single habit that separates profitable restoration contractors from busy ones. Do your own takeoff. Build your own bid from your own labor rates, your own material pricing, your own overhead and margin. Only then do you open the carrier's estimate and compare.
Two things happen when you work in that order. First, you get an honest number that reflects what the job actually costs you — not a regional average from a database updated on a lag. Second, you now have a line-by-line comparison document, which is exactly what a supplement is. You're not asking for more money. You're showing where two estimates diverge and why yours reflects the roof that exists.
Work the other direction — read the scope first — and you anchor to their number. Everything after that is you negotiating down from a figure you never chose.
Carrier estimates aren't usually wrong on the big-ticket items. Squares are squares. Where they bleed you is in the dozens of small line items that make up real installed cost. The recurring gaps:
O&P — commonly written at 10 and 10 — exists because a general contractor coordinating multiple trades incurs cost doing so. Carriers frequently resist it on roofing-only claims, arguing a single trade doesn't warrant it. Sometimes that's a fair read. Often it isn't: if you're coordinating gutters, siding, painting, and interior drywall repair behind the leak, you're performing general contracting and the file should reflect it.
The bigger trap is treating O&P as your entire profit. It isn't. Ten percent overhead against your actual overhead burden is a number you should be able to defend from your own P&L — most established roofing operations run overhead well north of that. If your real burden is 18% and you're accepting 10%, you're paying eight points to be there. Know your number before you argue for theirs.
Replacement cost value minus depreciation equals actual cash value. The carrier releases ACV up front, holds recoverable depreciation until the work is complete and documented, and the homeowner owes the deductible. Which means the check that lands first is meaningfully smaller than the total scope — and if you bid to the total while cash-flowing to the ACV, you'll feel it by week three.
Three things to build into how you price and schedule:
Supplementing is a legitimate part of restoration work — conditions genuinely aren't visible until tear-off. But a supplement is an administrative process with a cost: someone writes it, submits it, follows up, sometimes negotiates a reinspection. That's hours of office labor per job, plus the delay between performing the work and getting paid for it.
Build that cost into your overhead rate, and build the workflow into the job. Your crew lead should be photographing conditions as standard practice, not as a scramble after the fact. Every supplement needs the same three components: a photo showing the condition, a line item priced consistently with the rest of the estimate, and a reason it couldn't reasonably have been known at the time of the original scope. Missing any one and you're negotiating from weakness.
Consistency matters more than most contractors realize. If your original estimate prices decking at one rate and your supplement prices it higher, you've handed the desk adjuster a reason to reject the whole submission. Your numbers should come out of the same system every time.
Here's the honest test. Strip away the claim entirely. If a homeowner walked up and asked you to replace that exact roof, with that access, that pitch, that deck condition, on cash — what would you charge? That number is your bid. The claim is a funding mechanism, not a pricing authority.
If your number is meaningfully above the carrier's, that's a supplement conversation supported by your own documented takeoff. If it's below, you may have found a job with room in it — but check your takeoff before you celebrate, because it usually means you missed something.
What you should never do is let the scope define the work. Contractors who do this end up with a portfolio of jobs priced by strangers, a margin they can't explain, and a season that felt busy and finished flat.
Most of this comes down to one thing: having a repeatable, defensible estimate of your own for every claim job, produced fast enough that doing it first isn't a burden. When building your own number takes an afternoon, you'll skip it and read the scope instead. When it takes minutes — takeoff in, your labor rates and material pricing applied, overhead and margin calculated, line items itemized in a format you can set beside the carrier's — you'll do it every time.
That's the whole discipline. Your costs, your margin, your documentation, produced before you ever look at theirs. Everything else in restoration estimating is downstream of that habit.