Why Two Roof Quotes Differ by $8,000: A Line-by-Line Look at a Florida Roofing Estimate

A homeowner in Bradenton recently showed us three quotes. Same house, same roof, same week. The spread between the low and high bid was a little over $8,000.

The interesting part isn't that the numbers differed. It's that none of the three companies was lying. They were quoting genuinely different scopes of work, using different materials, with different amounts of the real cost disclosed up front — and all three had written it down in a way that made line-by-line comparison nearly impossible.

That's the actual problem with roofing estimates. Not dishonesty so much as incomparability. Here's how to read one properly, what each line means, and which items get quietly left off the cheap bid so it can be the cheap bid.

First: Stop Comparing Price Per Square

A “square” in roofing is 100 square feet of roof surface. Contractors price this way because it's how materials are sold and how labor is estimated, and there's nothing wrong with it internally.

As a comparison tool for homeowners, though, it fails, because two companies quoting the same dollar figure per square can be including wildly different things. One includes tear-off, disposal, synthetic underlayment, new drip edge on all edges, new valley metal, and the permit. The other includes shingles and labor, and everything else is an extra that appears later on a change order.

The same problem applies to total price. What you actually need is the scope, itemized. A serious estimate should let you see what's being done, not just what it costs. If you can't tell from the document what materials are going on your house and what work is being performed, that's a document problem worth raising before it's a price problem.

The single most useful thing you can do when collecting bids: write down the scope you want, hand the same list to every bidder, and ask them to price it. It's more work up front and it turns three incomparable documents into three comparable ones.

Tear-Off and Disposal

Removing the existing roof and hauling it away is real labor and real tonnage. On a tile roof it's a great deal of both — concrete and clay tile are heavy, and disposal is priced by weight.

Things to look for:

• How many layers? If your home has two layers of shingles, tear-off cost roughly doubles. Some older homes here have a layer that was gone over rather than removed. If a bid assumes one layer and finds two, expect a change order.
• Is disposal included or separate? Dumpster placement, hauling, and landfill fees should appear somewhere.
• Property protection. Tear-off is messy and destructive to landscaping if nobody plans for it. Good bids mention protection of pool cages, lanais, A/C units, and plantings. This matters more here than in most markets — screen enclosures are expensive and easy to damage.
• Magnetic sweep and cleanup. Should be stated, not assumed.

A tear-off line that's meaningfully cheaper than everyone else's usually means fewer people, less protection, or an assumption about layers that hasn't been verified.

Deck Repair — Where the Surprises Live

Nobody knows the condition of your roof deck until the old roofing is off. That's not evasion; it's physically true. Sheathing hides under the covering and the only honest way to assess it fully is to expose it.

What separates a good estimate from a bad one is how it handles that uncertainty. There are three approaches, and they are not equally good for you:

1. Unit price stated up front (best)

“Sheathing replacement, if required: $X per 4x8 sheet, installed.” You know the rate before work starts. If six sheets are bad, you can do the arithmetic yourself. There's no negotiation happening while your roof is open and you have no leverage.

2. An allowance included

“Includes up to X sheets; additional at $Y.” Also fine, and predictable.

3. Silence (worst)

The estimate says nothing about deck repair. This is the one that produces the angry phone call. The crew tears off, announces significant rot, and quotes a number on the spot — with your house open to the sky and no realistic option to get a second opinion. The price at that moment is whatever they say it is.

On the Gulf Coast, deck issues are common enough that you should treat their absence from an estimate as a warning rather than good news. Ask every bidder directly: what is your per-sheet price for sheathing replacement? If they won't put a number on it in writing, that tells you how that conversation is going to go later.

Related: Florida reroof requirements address re-fastening the deck. This is genuine work and genuine cost, and it's a line item you want to see, because deck attachment is a primary factor in whether a roof stays on the house in high wind.

Underlayment and the Secondary Water Barrier

Under your shingles or tile is the layer that actually keeps water out when the covering is compromised. In a Florida wind event, the covering can be damaged and the underlayment becomes the only thing between the weather and your ceiling.

Bids vary a lot here and homeowners rarely ask, because the layer is invisible once the job is done. Points of difference:

• Felt vs. synthetic. Synthetic underlayments are generally stronger, lighter, and hold up better to UV and foot traffic during installation. Felt is cheaper.
• Self-adhered vs. mechanically fastened. A fully self-adhered membrane bonds to the deck and seals around fasteners. It's a meaningfully better assembly and it costs more.
• Secondary water barrier. Florida's requirements around sealed roof decks exist because water intrusion through the deck is a major driver of hurricane losses. How a contractor achieves it — taped seams, self-adhered membrane, or another approved method — should be stated.
• Coverage at critical areas. Valleys, eaves, penetrations, and low-slope sections often warrant additional treatment.

If one bid is notably cheaper, this is one of the first places to look. Underlayment is a large-area material and downgrading it saves real money without changing anything the homeowner can see from the driveway.

The Metal: Drip Edge, Valleys, and Flashing

Metal components are unglamorous, individually inexpensive, and responsible for a disproportionate share of the leaks we get called out to look at.

• Drip edge. Should be new. Reusing existing drip edge is a corner that gets cut. Ask whether it's included on both eaves and rakes.
• Valley metal. Valleys concentrate water. Whether the bid includes new valley metal, and what gauge and finish, is worth knowing.
• Pipe boots and penetration flashing. Rubber boots degrade in Florida sun and are a classic failure point around year 8–12. New boots should be standard on a reroof. If the bid reuses them, you have a known future leak with a countdown on it.
• Wall and chimney flashing, counterflashing, step flashing. Anywhere the roof meets a vertical surface.
• Skylight flashing kits. If you have skylights, this is a specific question. Reflashing an old skylight under a new roof is often false economy — the skylight will fail before the roof does, and replacing it later means opening the new roof.

None of these items is expensive relative to the whole job. Collectively they're a good indicator of whether you're looking at a thorough scope or a thin one.

Ventilation

Attic ventilation affects how long your roof lasts and how hard your air conditioning works, and it's frequently ignored in bids because it's easy to just reinstall whatever was there.

Watch for whether the estimate addresses intake as well as exhaust. Ridge vents and off-ridge vents are exhaust; soffit vents are intake. Exhaust without adequate intake doesn't move much air — it's a common condition in older homes here, especially where soffits were painted or insulation was blown in over the intake path.

Also worth asking about: whether existing turbine or power vents are being replaced or reused, and whether mixing vent types is being avoided. Combining ridge vents with other exhaust vents on the same attic space can short-circuit airflow rather than improve it.

This is a place where a slightly more expensive bid may be doing something genuinely better for the life of the roof.

The Roofing Material Itself — and the Warranty Trap

The covering is the line homeowners focus on most, and it does matter: shingle line and tier, tile profile and whether it's mechanically fastened or foam-set, metal panel gauge and finish system.

But the warranty language deserves more scrutiny than it usually gets, because this is where estimates are most misleading — often without anyone intending to mislead.

Manufacturers offer tiered warranties. The upper tiers typically require a complete system of that manufacturer's components — their underlayment, their starter strip, their ridge cap, their ventilation — and frequently require installation by a certified or credentialed contractor. Meet those conditions and you get the enhanced coverage. Miss any of them and you get the basic material warranty, whatever the sales conversation implied.

So when an estimate says “lifetime warranty,” the questions are:

• Which specific warranty, by name and tier?
• Does this bid include every component that tier requires?
• Is your company credentialed by that manufacturer at the level the warranty requires?
• Is the warranty registered after installation — and will I receive documentation?
• What's covered: material only, or material and labor? For how long, and does coverage step down over time?

There's also the contractor's own workmanship warranty, which is separate. A long workmanship warranty is only worth what the company behind it is worth. Its practical value depends on whether the business will exist and be reachable in year seven — which is a fair thing to weigh alongside price.

Permits, Paperwork, and the Line Items That Get Left Off

These are the small ones that create most of the gap between a suspiciously low bid and a complete one:

• Permit fees. Real, jurisdiction-dependent, and payable regardless. A bid with no permit line either buried it or didn't include it.
• Notice of Commencement recording. Required above the $2,500 threshold under Fla. Stat. § 713.02(5), so effectively always on a replacement.
• Engineering or product approval documentation where the jurisdiction requires it.
• HOA submittal support — some companies prepare the architectural review package, some hand you a brochure and wish you luck.
• Satellite dish and solar removal/reset. If you have panels, this is a significant separate cost and needs to be addressed explicitly, including who is responsible if a panel is damaged.
• Gutter removal and reset, where gutters interfere with drip edge replacement.
• Lanai, pool cage, and screen enclosure interfaces — very common here and genuinely fiddly work.

Add these up and you can account for a large share of an $8,000 spread without either company being dishonest. One of them included the whole job. The other quoted the roof and will invoice the rest.

How to Actually Compare Three Bids

A practical method that takes about an hour and reliably saves people money:

1. Write your scope once. Material type and tier, underlayment type, new drip edge and valley metal, new pipe boots, ventilation approach, deck repair unit price, permit included, disposal included, warranty tier by name.
2. Send the identical list to every bidder and ask them to price that scope. Invite them to tell you if they'd recommend something different — and why. The explanation is informative.
3. Build a simple side-by-side. One row per line item, one column per company. Blank cells are the finding.
4. Verify licenses independently on the DBPR site — active status, correct classification, name matching the contract exactly.
5. Ask each one the deck question and get the per-sheet number in writing.
6. Check the payment schedule against § 489.126. A deposit over 10% of the contract price triggers the contractor's obligation to apply for permits within 30 days and start within 90 days of issuance. Very large up-front deposits deserve hard questions.

Once the scopes match, the price comparison becomes meaningful — and it's often not the spread you started with. In that Bradenton case, normalizing the scope closed most of the $8,000. The cheapest bid was cheapest because it was quoting a materially thinner job, and once the missing items were added back, two of the three were within a few hundred dollars of each other.

That's usually how it goes. The market is more efficient than it looks. The variation is mostly in what's being left out.