Is Your Roof Quote a Fixed Price, a Unit Price, or Time and Materials?

Most homeowners in St. Louis County read the total at the bottom of a roof quote and stop there. The total matters, but the way the number was built matters just as much, because it decides who carries the risk when the tear-off turns up something nobody could measure from the driveway. A roof quote usually follows one of three pricing structures: a fixed price, a unit price, or time and materials. Each one is a legitimate way to price a job. Each one puts the surprises in a different place.

Fixed price: the number is set, the scope is the variable

A fixed price means the roofer agrees to one total for a defined scope of work. If the quote says the existing roof will be torn off to the deck, the deck inspected, and the roof covered with architectural shingles, synthetic underlayment, new drip edge and new pipe boots, the total stays the same whether the crew finishes in two days or five. That certainty is the reason most homeowners prefer it. The catch is that the scope has to be specific enough to price. A fixed price built on a vague line such as 'replace roof' leaves the contractor deciding later what counts as extra, and that decision usually shows up as a change order after the old shingles are already off.

Ask the roofer to list what the fixed price excludes. On older houses in the county, the common exclusions are rotted decking found under the old shingles, soft-metal damage at a chimney or wall that was not visible from the ground, and any second layer of old roofing that the estimate did not count. None of those is a trick. They are conditions that can only be priced once the old roof is off, which is why the quote should say in advance how each one will be handled, who approves it, and whether the price for it is already set.

Unit price: you pay for what is found

A unit price sets a rate for each measured item, such as a square of roofing installed, a linear foot of drip edge, or a sheet of plywood replaced on the deck. The total is the rate multiplied by the quantity actually used. This structure fits work that cannot be counted before the roof is open. Decking is the usual example. A roofer can estimate how much plywood a house of a certain age will need, but the real number appears only when the shingles come off and the crew finds which boards are soft or split.

The risk with a unit price is that the quantities are not capped. A line that says decking replacement at a set rate per sheet is a rate, not a ceiling. Ask for two numbers: the rate, and the quantity the estimate assumed. Then ask what happens if the quantity comes in higher. The right answer is a written approval step before extra sheets are cut and fastened, not a bill that arrives after the crew has gone home. A roofer who prices by the unit should be able to show you the count as the work proceeds, with photos of each soft area, so you can see the basis for every line before the invoice.

Time and materials: the honest label and the least predictable bill

Time and materials bills the hours each crew member works at an agreed hourly rate, plus the cost of materials at invoice. It makes sense where the scope is truly unknown: a repair that might grow into a partial replacement, a leak that has to be traced across several slopes before anyone knows what is wrong, or structural work found during the tear-off. On a full replacement it is uncommon, and it is worth asking why it is being offered instead of a fixed price.

The homeowner's protection under this structure is a cap and a schedule. A not-to-exceed figure written into the agreement keeps the total inside a range you approved. Without a cap, the job can be finished at a price nobody agreed to. Ask also for a daily record of crew hours and the materials installed that day, so you can follow the bill as it grows. Keys documents damage and puts a written scope with photos and measurements in the homeowner's hands, and the same discipline should apply to hours and materials on any job billed this way. Ask for it in writing before the first nail goes in.

Reading which structure your quote is using

Some quotes never name their structure. They list a total, a set of line items, and a few phrases such as allowance or as needed. Read the page for three things. First, whether the total is described as firm or as an estimate. Second, whether any line carries a rate with a quantity attached, which signals unit pricing. Third, whether the words allowance or time and materials appear anywhere on the page. An allowance is a sum set aside for work that is not yet known, such as decking. It behaves like a unit price: if the work costs less than the allowance, the difference may come back to you, and if it costs more, the difference is added to the bill. An allowance that is not described in these terms is worth asking about before you sign.

Questions to put to the roofer before you sign

• Is the total a fixed price for a scope written on the page, and what does that scope exclude?
• Which lines are unit prices, and what quantity did the estimate assume for each one?
• What is the cap on any time and materials or allowance item, and who approves spending past it before the work is done?
• If the old roof reveals damage that cannot be seen now, which parts are priced now and which are priced later?
• How will a change be written, and will you see it before the work is performed?

Get the answers in writing, on the same document as the price. A verbal promise that the decking will be taken care of is not a term of the contract. If a roofer will not put a cap, a rate, or an approval step on paper, the quote is using a pricing structure you do not yet understand, and that is reason enough to slow down before you decide. A second reading of the scope is a reasonable request at any point, and Keys can be reached at (314) 220-2333 to go over a written scope line by line.

St. Louis conditions that move the number

Winter freeze-thaw cycles open small cracks in older shingles and around flashing, so a roof that looked sound in the fall can need more repair than the early estimate suggested. Ice damming at the eave pushes meltwater back under the courses, and the damage often shows up as soft sheathing at the edge, which is a decking question and belongs on the unit-price line or in the allowance. Hail season brings soft-metal dents and granule loss that a quote may or may not include, so check whether the scope names the metal and the flashing or leaves them out. Permits come from the municipal desk in the city or county where the house sits, and the permit fee should appear as its own line rather than being buried in the labor rate. Ask which desk the job will be filed with and whether that fee is in the total.

Price structure is not a matter of trust alone. It is a matter of which surprises are written down before the tear-off starts and which ones get settled on the day, with a homeowner standing in the driveway. The more of the open questions that are answered on the page before the crew arrives, the less likely the final bill will look different from the quote you accepted.