How to Estimate a Roofing Job

A roofing estimate has three parts: the measurement (squares, pitch, penetrations), the takeoff (tear-off, materials, flashing, vents, disposal), and the conditions (layers, decking, access, height). Miss any one and you're either too expensive to win or too cheap to survive. The walkthrough below prices a full replacement the way profitable roofers do — every layer of the job as its own line item.

Step 1: Measure in squares

Roofing is priced per square (100 sq ft). Measure each roof plane's footprint (length × width), multiply by the pitch multiplier for true area, and divide by 100:

Add 10% waste for simple gable roofs, 15% for cut-up roofs with dormers, valleys, and hips. Our roofing squares chart and pitch multiplier chart cover every common size — and the roofing calculator runs the whole takeoff in one pass.

Step 2: Price the tear-off honestly

Tear-off is where estimates die. Check the layer count with a test spot at the eave — two layers of shingles is twice the tear-off labor and twice the dumpster weight:

Always include a decking allowance — 5–10 sheets on a typical home — priced per sheet with final count determined at tear-off. Rotted decking you discover mid-job is either a priced line item or a donation. There is no third option.

Step 3: Take off the materials

• Shingles: squares + waste. Three bundles per square for standard architectural shingles — see our bundles-per-square guide for the exact counts.
• Underlayment: synthetic underlayment for the field (~$0.15–$0.30/sq ft), ice-and-water shield in valleys and eaves in cold climates.
• Flashing: step flashing, chimney flashing, pipe boots, drip edge, valley metal. Price per penetration — each chimney is $200–$500 in flashing labor and material.
• Ventilation: ridge vent by the linear foot, plus intake (soffit) vents. Count existing vents and match or improve.
• Ridge cap: linear feet of ridge ÷ coverage per bundle. Don't forget it — it's the most commonly missed line item.
• Starter strip: linear feet of eaves and rakes.

Step 4: Price labor from production, not hope

Know your crew's daily square rate and work backward. A crew that installs 15 squares a day on a walkable 6/12 prices a 25-square roof at two days of labor. Adjust for reality:

• Steep (8/12+): +15–25% labor — staging, safety, slower production.
• Two-story: +10–15% — material handling and tear-off take longer.
• Cut-up roof: +10–20% — valleys, dormers, and flashing eat time.
• Long carry: dumpster 100 feet from the eave doubles cleanup labor. Walk it during the estimate.

Step 5: Add the forgotten line items

• Permits: $150–$500 in most jurisdictions. Some require mid-job inspections.
• Satellite dish / solar: removal and reinstallation — coordinate with the provider or price it yourself.
• Landscaping protection: tarps, plywood over plantings. One crushed $800 shrub wipes out a day's margin.
• Magnetic nail sweep: non-negotiable, and worth naming on the quote — clients remember flat tires.
• Warranty registration: manufacturer extended warranties require certified installation and registration. Name the warranty tier on the estimate.

Present it in tiers

Good/Better/Best pricing wins roofing jobs: a 25-year 3-tab or basic architectural option, a 30-year architectural with upgraded underlayment, and a premium designer or impact-resistant shingle with extended warranty. Roughly 60% of clients pick the middle tier — which is exactly where your best margin lives. Present all three on one page from the quote builder and let the client self-select instead of negotiating you down.

Costly mistakes to avoid

• Guessing the layer count. Pull a test shingle at the eave. Every hidden layer is a day of labor and a ton of disposal.
• No decking allowance. The one roof in five with rotted decking will remind you why the line item exists.
• Forgetting ridge cap and starter. Small lines, real money — and embarrassing to add later.
• Pricing steep like walkable. An 8/12 roof is a different job than a 6/12. Price it like one.
• Skipping the attic. Five minutes inside shows decking condition, ventilation, and leak history that the exterior hides.
• Lump-sum insurance estimates. Carriers pay per line item. Itemize everything or watch the adjuster cut your vague total.

Run the takeoff in the roofing calculator, build the tiered estimate in CalcBid, and send it from the driveway. Same-day estimates close at roughly double the rate of next-day ones — and nobody out-hustles a roofer who quotes before the ladder's back on the truck.

Fully worked estimate: a 24-square ranch re-roof

Take a one-story ranch with a 2,000 sq ft footprint and a walkable 6/12 pitch. At the 1.118 multiplier from Step 1, true roof area is about 2,400 sq ft — 24 squares before waste. One layer of shingles to tear off, one chimney, two pipe boots, and average access with the dumpster in the driveway. Here is the takeoff priced with the ranges in this guide, using mid-points so you can see the arithmetic:

The crew math behind the labor line: at the production rate from Step 4 — about 15 squares a day on a walkable 6/12 — installation takes roughly 1.6 days, plus most of a day for tear-off and cleanup. A four-person crew over about two and a half days is roughly 80 crew-hours on site, which is what the $225 per square has to cover along with staging, the magnetic nail sweep, and warranty registration. Subtotal for the lines above is $14,460. Add overhead and profit at a combined 15% — $2,170 — and the bid lands at about $16,600. Run the per-square check before you send it: $16,600 ÷ 24 squares is about $692 per square all-in for a tear-off and replacement. If your market will not support that number, adjust the tier you present — a basic architectural option in the Good tier — rather than quietly deleting the decking allowance or the disposal line, because those costs do not disappear when they leave the quote.

How regional labor markets move your bid

The $150–$300 per square labor range in the FAQ is wide because the market sets it. In high-cost metros and on the coasts, experienced crews price at or above the top of that range and book out weeks ahead; in rural markets with lower overhead, the same work often prices near the bottom. Neither number is wrong — quoting a rural rate in a metro loses money on every square, and quoting a metro rate two counties over loses the job.

Storm markets break the range entirely. After a major hail or hurricane event, every roofer in the region is busy, tear-off crews and dumpsters get scarce, and material prices climb — bids that were competitive in spring can be below cost by fall. Re-price labor, disposal, and shingles on any estimate older than a few weeks in a storm market instead of honoring a stale takeoff. Finally, price distance honestly: work beyond your normal radius adds drive time that produces zero squares, and multi-day jobs can require lodging and meals for the crew. Put travel and lodging in as their own line items, the same way you itemize permits — a client can accept or decline a visible cost, but absorbed travel quietly turns a won bid into a break-even job.