Shingle Roof Installation Cost Calculator

Three-tab is not the saving it looks like

The whole three-tab case is that it is cheaper. On this roof it is cheaper by $1,000 — $7,650 against $8,650 — and here is what the thousand dollars buys:

That is five to ten more years of roof, and roughly double the wind rating, for about 12% of the job. Spread over the life of the roof the architectural shingle is cheaper per year, which is why three-tab has very nearly disappeared from new residential work and now exists mainly for rentals, flips and insurance-minimum replacements.

When three-tab is genuinely the right call: you are selling within a year or two, it is a rental you are holding briefly, the HOA or an insurer requires only a minimum, or you need to match an existing three-tab roof on an attached structure. Those are real reasons. "Saving money" on a roof you intend to live under is not one of them.

The ratings nobody reads, and the one that pays

Two numbers on the shingle wrapper matter and neither gets discussed in a sales call.

Wind rating. Shingles are rated to 60, 70, 110 or 130 mph under ASTM D7158 or D3161. Most architectural shingles are 110 or 130; three-tab is usually 60 or 70. The rating is conditional on the nailing pattern — six nails per shingle rather than four for the high ratings, and a correctly installed starter course. A 130 mph shingle nailed with four nails is not a 130 mph roof, and this is the commonest way a wind claim gets denied. Ask for six-nail installation and get it on the quote; it costs almost nothing.

Impact rating. UL 2218 Class 1 to 4, with Class 4 the highest. In hail states a Class 4 impact-rated shingle commonly earns 10 to 30% off the wind-and-hail portion of a homeowner's premium, every year, for the life of the roof. The shingle costs roughly 10 to 20% more. In Texas, Oklahoma, Kansas, Colorado and Nebraska this is usually the best-value decision available on the whole job — and your insurer will tell you the exact discount before you buy if you ask. Do ask, because in some states it is nothing and then it is not worth it.

The four lines a cheap asphalt quote leaves out

These are what separate quotes that look like the same job and are not. Every one of them is cheap to include and expensive to retrofit.

1. Ridge vent. $8 to $12 a linear foot. Without adequate exhaust at the ridge and intake at the soffit, the attic cooks the shingles from underneath and the rated life becomes a fiction. This is the item most often missing.
2. New flashings. Step flashing where the roof meets a wall, counter flashing at the chimney, valley metal. Reused flashing is the single most common reason a brand new roof leaks in its first winter. Replacing it is a few hundred dollars.
3. Pipe boots. $12 to $20 each. The rubber collar on a plumbing vent fails long before the shingles do, so reusing old ones on a new roof guarantees a service call in a few years.
4. Ice-and-water membrane at the eaves and in the valleys, in any climate that freezes. This is the self-adhered layer that stops an ice dam pushing water back up under the shingles.

On this model those items together come to about $45 a square, or $810 on an 1,800 sq ft roof. A quote that is $800 cheaper than the others is frequently a quote with none of them in it.

What you are paying for

For an 1,800 sq ft architectural asphalt roof, walkable pitch, single story, at $8,650:

Asphalt is the only covering on this site where the material is a minority of the direct cost and still the thing everybody asks about. Forty crew hours against 81 for standing seam metal, 90 for tile and 144 for slate — that speed is most of why asphalt is two thirds of American roofs.

What drives the price far more than the shingle

The shingle choice moves this job by about 12%. These move it much more:

• Pitch. Up to 6/12 a roofer walks the roof and works at normal speed. Past that it is staging, harnesses and fall protection, and the quote climbs 25 to 50% for the same area. A steep roof is not slightly harder, it is different work.
• Stories. Every bundle goes up and every piece of the old roof comes down. Two stories adds 10 to 15% and three or more close to 30%.
• Decking. Nobody knows what is under the old roof until it is off. Sheathing is around $12 a sheet in material; a handful of bad sheets is a few hundred dollars and a long-standing leak can add thousands. Get this as a per-sheet rate on the quote, not an allowance — an allowance means you find out afterwards.
• Complexity. Dormers, valleys, skylights, chimneys and multiple ridgelines all add flashing, cutting and time without adding area. Two roofs with the same square count can be a 30% difference in work.

On this roof, steep pitch and a second story together take $8,650 to $12,100. That is a bigger swing than every material decision on the page combined.

Shingle warranties, read properly

A "50 year" or "lifetime" shingle warranty is worth much less than it sounds, and it is worth knowing why before it is used to sell you something.

• It covers the shingle, not the roof. Manufacturing defects in the shingle itself. Not the labor to strip the roof and put a new one on, which is most of the cost.
• It is prorated, usually after a short non-prorated period of 10 or 15 years. By year 20 the payout on a defective shingle is a fraction of its price.
• It is conditional on installation and ventilation. Inadequate attic ventilation voids most of them, which is another reason the ridge vent line matters.
• "Lifetime" means as long as the original purchaser owns the house, and usually transfers once, within a window, sometimes for a fee.
• An enhanced or system warranty — where the manufacturer certifies the contractor and covers labor too — is the only version that meaningfully transfers risk. It requires a certified installer and the full system of that manufacturer's components, and it is worth asking the price of.

The workmanship warranty is the one that matters. Nearly all roof problems in the first ten years are installation, not manufacture. Ask how long the roofer covers their own work, get it in writing, and weigh it against how long they have been in business — a 25 year workmanship warranty from a company three years old is a sentence, not a guarantee.

How long it will actually last

Rated lives assume good ventilation and a competent install. In practice:

• A dark roof in a hot climate runs 5 to 10 years short of its rating. Attic temperature is the dominant factor in asphalt aging, which is the strongest argument for getting the ventilation right.
• A poorly ventilated attic can take a 30 year shingle down to 15, and it also voids the warranty.
• Algae streaking — the black streaks on north-facing slopes — is cosmetic, not structural, and is prevented by an algae-resistant shingle with copper granules. Worth specifying in humid climates at little or no extra cost.
• Granule loss in the gutters in the first few months after installation is normal. Years later it is the roof telling you it is near the end.

Questions worth asking

• Architectural or three-tab, and what is the wind rating?
• Four nails or six? Six, for the rating to hold.
• Is a Class 4 impact-rated shingle worth it here? Call your insurer and ask for the actual discount.
• Is ridge vent included, and is there adequate soffit intake to match it?
• Are all the flashings new — step, counter, valley?
• New pipe boots?
• Ice-and-water at the eaves and valleys, if it freezes here?
• What is the decking rate per sheet? Not an allowance.
• Algae-resistant shingles?
• How long is the workmanship warranty, and how long have you been in business?
• Is this an enhanced system warranty, and what would it cost?