Reshingle Roof Estimate: What to Expect

The number at the bottom of a roofing bid tells you almost nothing; the line items above it tell you everything. A solid reshingle roof estimate should read like a materials list plus a labor plan, not a single lump sum scribbled on a business card. I have reviewed hundreds of estimates for homeowners, and the cheap ones almost always leave out the parts that cause leaks two years later, decking replacement, drip edge, ice-and-water shield, and proper ventilation. Learn what belongs on the estimate and you can spot a corner-cutter before you ever hand over a deposit.

This guide breaks down every component of a reshingle roof estimate with real numbers so you can read a bid like a contractor and know when a price is too good to be true.

How Roofers Measure the Job: The “Square”

Roofing is priced by the square, and a square equals 100 square feet of roof surface. A typical single-story house has 15 to 25 squares of roof; a larger two-story can run 30 to 40 squares. Note that roof area is always larger than your home’s floor footprint because of the pitch, so a 2,000-square-foot house often has 2,400 to 3,000 square feet of roof.

Pitch matters too. Roofers rate steepness as rise over run, like 6/12 (6 inches of rise per 12 inches of run). Anything above 8/12 is a walkable-but-steep roof that requires roof jacks and harnesses, and above 10/12 the labor rate climbs because crews cannot walk it freely. A steep or complex roof with lots of hips, valleys, and dormers can add 25 to 50 percent to labor over a simple gable.

Typical Cost Per Square and Total Range

For standard architectural asphalt shingles installed on an average roof, expect roughly $350 to $550 per square, all-in with tear-off, materials, and labor. That works out to $4.50 to $7.00 per square foot of roof area, or a total of $8,000 to $20,000 for most homes. Basic 3-tab shingles run a bit less; premium designer, impact-rated, or synthetic shingles run more.

Regional labor rates, roof complexity, and material choice swing these numbers. A simple 20-square gable roof in a low-cost market might land near $8,000, while a steep 35-square cut-up roof in a high-cost metro can exceed $22,000 for the same shingle.

The Line Items That Belong on Every Estimate

A complete reshingle estimate should itemize these components. If any are missing, ask why:

• Tear-off and disposal: Removing old shingles and hauling debris, usually $75 to $150 per square, more for a second layer
• Underlayment: Synthetic underlayment or 15/30 lb felt over the whole deck
• Ice-and-water shield: Self-adhering membrane in valleys and along eaves in cold climates, required by code in many northern states
• Drip edge: Metal edging at eaves and rakes, required by current code
• Starter strip and ridge cap: Purpose-made starter course and cap shingles, not cut-up field shingles
• Flashing: New step, valley, and counter flashing at walls, chimneys, and penetrations
• Ventilation: Ridge vent, box vents, or turbines to meet the 1:150 or 1:300 attic ventilation ratio
• Decking allowance: A per-sheet price for replacing rotten plywood found during tear-off

Tear-Off vs. Overlay

You will see two approaches. A full tear-off strips the roof to bare decking and starts fresh; an overlay lays new shingles over the existing layer. Overlay is cheaper because it skips tear-off and disposal, saving maybe $75 to $150 per square, but it is a false economy in most cases.

Code allows a maximum of two shingle layers, so an overlay uses up your one allowed second layer and forces a full tear-off next time. It also hides rotten decking, adds weight, traps heat, and never lays as flat. I recommend a full tear-off on nearly every job. It is the only way to inspect and repair the decking and reset ventilation and flashing correctly.

The Decking Question

Rotten or delaminated roof decking is the most common surprise cost, and a good estimate handles it up front. The estimate should quote a per-sheet price, often $70 to $120 per 4-by-8 sheet of plywood or OSB, installed, for any decking that must be replaced once the old shingles come off.

You cannot know how much bad decking exists until the roof is open, so an honest roofer prices the reshingle assuming sound decking and lists the per-sheet rate for replacements as a separate allowance. Be suspicious of any estimate that promises zero decking cost sight unseen or that has no decking line at all.

What Drives Your Estimate Up or Down

Several factors move the final number:

• Pitch and stories: Steeper and higher roofs cost more in labor and safety setup
• Complexity: Hips, valleys, dormers, skylights, and chimneys add flashing and cut waste
• Shingle grade: 3-tab is cheapest, architectural is standard, designer and impact-rated cost more
• Layers to remove: Two or three existing layers double or triple tear-off cost
• Access: Tight lots, landscaping, and multi-story access slow crews down
• Region and season: Labor rates vary widely, and peak season pricing runs higher

Reading and Comparing Bids

Get at least three estimates and compare them line by line, not just at the bottom. A bid that is thousands cheaper is usually skipping something, an overlay instead of tear-off, felt instead of ice-and-water shield, reused flashing, or no ventilation upgrade. Ask each roofer to specify the shingle brand and line, the underlayment type, the warranty, and whether they are licensed and carry liability and workers’ comp insurance.

A legitimate estimate also spells out payment terms (a reasonable deposit, never the full amount up front), the workmanship warranty length, and cleanup and magnetic nail sweep. When you can read the estimate and account for every dollar against a specific material or task, you know you are dealing with a professional, and you know the roof will still be watertight long after the crew drives away.

Shingle Grades and How They Change the Price

The shingle you choose swings the estimate more than almost any other single line. Know the three broad tiers:

• 3-tab shingles: The budget option, flat single-layer shingles rated around 20 to 25 years, typically $90 to $130 per square in material. They are the cheapest but the thinnest and least wind-resistant.
• Architectural (dimensional) shingles: The standard choice today, laminated for a thicker look, rated 30 years, with better wind ratings up to 110 to 130 mph. Material runs roughly $110 to $180 per square.
• Premium and impact-resistant (Class 4): Designer looks or hail-rated shingles that can earn an insurance discount, $200 to $400-plus per square in material.

On most homes I steer people toward architectural shingles. The upgrade over 3-tab is modest on a full job once labor is factored in, and you gain a longer warranty and better wind performance. In hail country, Class 4 impact-resistant shingles often pay for themselves through a premium discount.

Warranties and What They Actually Cover

A reshingle estimate should spell out two separate warranties, and homeowners routinely confuse them. The manufacturer’s material warranty covers defects in the shingles themselves, often 25 to 50 years or “lifetime,” but it is usually prorated and covers only material, not labor, after the first few years. The contractor’s workmanship warranty covers installation errors, bad flashing, improper nailing, and typically runs 2 to 10 years.

The workmanship warranty is the one that protects you against leaks, because most leaks come from install errors, not shingle defects. A contractor confident in their work stands behind it for years. Some manufacturers also offer enhanced system warranties, but only when a certified installer uses a full package of that brand’s underlayment, starter, and ridge components. Ask which warranty applies and get it in writing on the estimate.

Red Flags in a Roofing Estimate

Certain signs tell you to walk away no matter how good the price looks:

• A demand for full payment up front, a reasonable deposit is normal, but never the whole amount
• No written contract, license number, or proof of liability and workers’ comp insurance
• An overlay quoted without even discussing tear-off, or no decking allowance at all
• Reused flashing and pipe boots instead of new metal
• A price far below every other bid, which almost always means something critical is missing
• High-pressure “sign today” storm-chaser tactics after a hailstorm

Getting an Accurate Estimate

To get a bid you can trust, have the roofer physically measure the roof or pull accurate satellite measurements, not eyeball it from the driveway. Insist on a written, itemized estimate that names the shingle brand and line, the underlayment type, the flashing to be replaced, the ventilation plan, the decking allowance per sheet, and both warranties. Confirm the contractor is licensed, insured, and carries workers’ comp so an injured worker is not your liability.

Compare at least three of these itemized bids line by line. When you can account for every dollar against a specific material or task and every roofer is quoting the same scope, the lowest legitimate bid is a real number, not a trap. A reshingle is a five-figure investment that protects everything under it, so spend the extra hour reading the estimate closely. The bid that reads like a detailed materials-and-labor plan, not a scribbled lump sum, is the one that leaves you with a roof that stays dry long after the crew drives away.