What Actually Drives the Price of a Roof

Royal Dane Roofing · Salt Lake City, UT · From the roof

What Actually Drives the Price of a Roof

The first question almost everybody asks me on the phone is what a roof costs. It is the right question. It is also the one question I will not answer over the phone, and I want to explain why, because I know how that sounds when you are just trying to plan.

Here is the problem. If I give you a number without seeing your house, I am guessing, and a guess only goes one of two directions. Either I guess high and you write me off before I ever get to look at the roof, or I guess low, get the job, and then come back mid-tear-off to tell you the price went up. I have been on the receiving end of that as a homeowner in other trades and it is a rotten feeling. I would rather be the guy who says he does not know yet.

What I can do is tell you what moves the number. Once you understand those things, you can look at any bid from anybody and see what they are actually charging you for. That is worth more than a number I made up in a parking lot.

Squares, not square feet

A roofing square is one hundred square feet of roof surface, and everything in this trade is priced by the square, because that is how material ships and how labor is measured. Homeowners almost always give me the square footage of the house instead, and it is never the same number. A two-story home might be three thousand square feet of living space sitting under eighteen or nineteen squares of roof, because the second floor stacks on the first. A rambler in West Valley with the same three thousand feet could be over thirty squares, spread out on one level. Same house size, wildly different roof.

Then there is overhang. Your roof is bigger than your footprint. Eaves and rakes hang past the walls, sometimes by a couple of feet on older Salt Lake homes, and every bit of that is roof somebody has to cover. Add a detached garage, a porch, a covered patio, and you are stacking on squares nobody counted from the sidewalk. So when I come out, I measure. I will pull an aerial to start, but then I get on the roof, take actual dimensions, count the planes, and account for the overhangs. That number is the base of everything else, and it goes in writing so you can check it against anyone else’s.

Pitch, and why steep costs more

Pitch is how steep the roof is, written as inches of rise over twelve inches of run. A four in twelve is a comfortable walking roof. An eight in twelve you are working on carefully. A twelve in twelve, and you are not standing on it at all without staging.

Steep changes three things at once. Labor slows down, because a crew that moves freely on a low slope has to move deliberately on a steep one, and everything from carrying bundles to setting a course takes longer. Safety setup grows, because harnesses, anchor points, roof jacks, and planking all go up before a single shingle moves and come down after. And material waste climbs, because steep roofs come with more cuts and more complicated intersections. There is a fourth piece people miss: a steep roof has more actual surface area than its footprint suggests.

None of this is a surcharge somebody invented. It is hours. When you see two bids on the same steep roof and one is noticeably cheaper, one honest explanation is that the cheaper crew is planning to work it without proper fall protection. That is their risk right up until it is your problem.

What is already up there

Tear-off is real work, and it scales with how many layers are on the house. One layer of architectural shingle comes off relatively cleanly. Two layers is more than twice the work, because the bottom layer is usually old three-tab gone brittle, and it comes up in fragments instead of sheets. I have been on Salt Lake homes with three layers, which was legal a long time ago and is not anymore. All of that material has to go somewhere, so disposal is a genuine line item: the dumpster, the haul, and the tipping fee, which is charged by weight. Roofing debris is heavy, and two layers off a big rambler can be several tons. If a bid seems low, this is one of the first places to check.

Old wood shake is its own category. There are still shake roofs on the benches and in the older parts of the valley, and pulling one is slow, dirty work, often over spaced sheathing instead of solid decking, which means the whole deck gets sheeted before anything else can happen. If you have shake, expect a real conversation about it. This is why layer count is one of the questions I ask before I even drive out, so I know what I am walking into.

The part nobody can know until the roof is off

Under your shingles is decking, usually plywood or OSB, and on older homes sometimes plank sheathing. Until the old roof comes off, nobody knows what condition it is in. Not me, not the guy who bid it cheaper, nobody. You get hints: a soft spot underfoot, a stain in the attic, an old repair, a valley that has been leaking quietly for a couple of winters. I look for that during the assessment and get in the attic with a light whenever I can, because from underneath you can see water tracks and daylight and delamination that are invisible from the top. But hints are not knowing. I have torn off roofs that looked rough and found sound deck across, and torn off roofs that looked fine and found four sheets gone to mush around a chimney.

Every honest bid handles this the same way: a per-sheet price for decking replacement, written on the bid, with the count determined during tear-off. That is not a loophole, it is the only truthful way to price something nobody can see. Insist that the per-sheet number is on the paper before work starts, so nobody is inventing a price while your house is open. The dishonest version, and I have cleaned up after it, is a crew that finds bad deck and roofs over it because the bid had no line for it and they do not want the conversation. New shingles nailed into rotten sheathing do not hold. You paid for a roof and got a covering.

Cut-up roofs cost more than big simple ones

A plain gable roof is two planes and a ridge. A crew can get in a rhythm and move. Every feature you add breaks that rhythm and adds hand work.

Valleys are where two planes meet and dump water into a single channel, which makes them the highest-volume, highest-risk area on the roof. They get lined, detailed, and cut precisely. Dormers multiply that: every dormer brings its own little roof, two sidewalls that need step flashing woven in course by course, and usually a valley on each side. Chimneys need flashing built in pieces, base, step, and counterflashing let into the masonry, which is slow and skilled work. Skylights need a kit flashed and set correctly. Hips cost more than gables because every course gets cut to angle on the hip lines, plus capping.

So two houses with the same square count can be very different jobs. One is twenty-two squares of open gable. The other is twenty-two squares with five dormers and two chimneys. The second takes substantially longer and carries far more places to get it wrong, which is why complexity is the second thing I write down after the measurement, and why a replacement bid should describe your specific roof, not roofs in general.

Access, materials, and the things that ride along

Access sounds trivial and it is not. A crew needs somewhere to set a dumpster within reasonable throwing distance of the roof, and somewhere to land material. On a suburban lot in Taylorsville with a wide driveway, that is easy. On a tight lot in the Avenues with a narrow drive, a retaining wall, and a shared alley, everything gets carried further by hand. On a lot of houses shingles get delivered by boom truck straight onto the roof, which is fast. If a house cannot be reached by boom because of trees, wires, or setback, that material goes up a ladder on somebody’s shoulder, and that is hours.

Then material choice. Shingles come in tiers, and the tier changes both the material cost and the warranty behind it. We install IKO, and there is a real difference between a basic three-tab and a heavier architectural or designer shingle in weight, wind rating, and how long the manufacturer stands behind it. Some warranty tiers also require a full system, meaning the manufacturer’s starter, ridge cap, and underlayment rather than mixed brands, which is worth knowing before you compare two bids that both say “lifetime.”

And then the work that rides along with any replacement. Underlayment, and specifically ice and water membrane at the eaves and in the valleys, which on the Wasatch Front is not optional in my opinion regardless of what the minimum allows. New flashing at every wall, chimney, and penetration. Drip edge. Starter course. Ridge cap. Ventilation, because a roof replacement is the one moment when fixing bad attic ventilation is cheap and easy, and skipping it means the new roof cooks the same way the old one did. If your gutters are shot, that is also the natural moment to deal with them, since gutter work is far simpler with the edge already open.

Why the cheapest bid is usually cheapest for a reason

I am not going to tell you the low bid is always wrong. Sometimes a good crew is hungry, or lives around the corner, or already has a dumpster on your street. But when a bid comes in noticeably under everyone else, there is almost always a reason, and it is usually one of these. A layer is not coming off. Going over the existing roof saves the tear-off labor and the entire disposal cost. It also means nobody looks at your deck, the new shingles lie over the old profile, and you have doubled the weight on the framing. Read the bid: it will either say tear off to deck, or it will be quiet about it.

The flashings are being reused. Pulling old chimney and wall flashing and forming new is real work. Bending the old stuff back down and running new shingles up to it is fast and free. It also puts brand new roofing against fifteen-year-old metal at the exact spots where roofs leak. If the bid does not say new flashing, ask.

The ice and water shield is missing, or there is a token strip of it. This is the membrane that protects the eave when a dam forms and backs water uphill, which happens here every winter. It is the first thing cut on a race-to-the-bottom bid, and you cannot see whether it is there once the shingles are on. Or the ventilation is untouched, the drip edge is skipped, cheap pipe boots go on, or the crew is not carrying workers compensation and liability insurance. That last one can genuinely land on you. Ask for a certificate of insurance, and ask for it directly from the insurance agent rather than as a copy the contractor hands you.

So compare bids line by line and not by total. Squares. Tear-off, and how many layers. The per-sheet decking price. Ice and water, and where it is going. New flashing, itemized by location. Ventilation. Material and warranty tier. Cleanup and magnet sweep. Two bids with the same total can be completely different roofs, and two with different totals are often the same roof once you add back what the cheaper one left out.

What happens when I come out

The assessment is free and it takes a while, because I am not there to hand you a folder and leave. I walk the roof if it is safe to walk. I measure it, count the planes, note the pitch, and look at the condition of what is up there: granule loss, cupping, nail pops, the state of every flashing, the pipe boots, the valleys, whether previous work was done well. I get in the attic when there is access, because the underside tells the truth about ventilation, insulation, past leaks, and deck condition in a way the topside never will. I look at your gutters and eaves too, since storm and wind damage shows up at the edges first and may change whether this is an insurance conversation at all.

Then I sit down with you and go through what I found, including the parts that are fine. If the roof has years left, I will tell you that and tell you what to watch. Plenty of the time the right answer is a repair, not a replacement, and I would rather do the honest small job now and earn the big one later.

If it does need replacing, you get it in writing: the measured squares, the layer count, the per-sheet decking price, exactly which flashings are being replaced, where the ice and water is going, the ventilation plan, the material and its warranty tier, disposal, and cleanup. One page you can hold next to anybody else’s. Nothing verbal, nothing “we will figure that out when we get up there.” I came out of running someone else’s company and started my own so I could do it this way, and every job has my name attached to it. That is the whole reason I will not throw a number at you over the phone. You can have me come look at the roof and then decide.

Quick Answers

Why can you not give me a ballpark on the phone?

Because a ballpark that is wrong is worse than no number at all. The two biggest drivers are how many squares you actually have and how complicated the roof is, and neither can be judged from a description. Add unknown layer count, unknown deck condition, and access, and any phone number is a coin flip.

How long does the assessment take, and is there any obligation?

Usually around an hour, longer on a big or complicated roof. I walk it, measure it, get in the attic if there is access, photograph what I find, and then go through it with you. No obligation, no charge, and no sign-tonight routine. You are free to take the written scope to two other roofers and compare.

Will you find things wrong just to run the price up?

That is a fair worry and the answer is photographs. Everything I find gets documented, and I show you the picture of the soft deck sheet or the failed chimney flashing rather than asking you to take my word. Plenty of assessments end with me telling somebody their roof is fine and to call me in a few years.

Does insurance change the picture on cost?

It can change it completely. If the damage came from hail or wind, the insurer may cover a repair or a full replacement, and the conversation shifts to scope and to your deductible. What matters is documenting the damage properly and on time, since policies have deadlines. If it is a claim, see how the claim process works.

What should I ask every roofer who bids my house?

Five things. How many squares did you measure, and how. Is this a full tear-off to the deck, and how many layers. What is your per-sheet price for bad decking. Which flashings are you replacing versus reusing, and where exactly is the ice and water membrane going. And can your insurance agent send me a certificate of insurance directly.