Replace Roof Shingles Estimate: How to Build an Accurate Bid

Missing one line item on a shingle replacement bid can cost you $800 to $2,000 in profit. I’ve seen it happen. A contractor forgets to price ice and water shield on the eaves, or leaves out the dumpster fee, and suddenly the job is upside down before the first bundle hits the roof.

Building an accurate replace roof shingles estimate comes down to measuring right, pricing every component, and not cutting corners on the hidden costs that eat your margin. Here’s how to do it.

Quick Answer: What Does a Shingle Replacement Cost?

A full shingle roof replacement runs $7,000 to $30,000+ for most homes, depending on roof size, shingle type, and pitch. For a standard 20-square roof with architectural shingles, expect to bid between $10,000 and $18,000 installed. That breaks down to roughly $4-$7 per square foot all-in, according to HomeAdvisor and Angi 2026 roofing cost data.

Use our Roofing Calculator to run your numbers fast. Try EstimationPro free to build a full line-item estimate with materials, labor, and tear-off priced out in minutes.

What You Need to Measure Before Estimating

Get these numbers locked down before you price anything. Wrong measurements mean wrong bids.

1. Roof square footage - Measure the footprint of the house and multiply by the pitch factor. A 1,500 sq ft footprint with a 6/12 pitch gives you roughly 1,675 sq ft of actual roof area. Our Roof Pitch Calculator handles this math automatically.

2. Number of squares - Divide total roof area by 100. That 1,675 sq ft roof is 16.75 squares. Round up to 17 for ordering.

3. Ridge, hip, and valley lengths - These determine how much ridge cap, starter strip, and flashing you need. Walk the roof or measure from a drone photo.

4. Penetrations - Count every vent pipe, exhaust fan, skylight, and chimney. Each one needs flashing, and chimneys especially add labor time.

5. Number of layers to tear off - One layer versus two layers of old shingles changes your tear-off and disposal costs significantly. Some municipalities cap the number of layers at two before requiring a full tear-off to decking.

6. Deck condition - You won’t know this for certain until the old shingles are off, but look for signs of rot, sagging, or water damage. Build contingency into your estimate.

Material Costs by Shingle Type

This table shows material cost per roofing square (100 sq ft). Labor is separate.

Source: Angi 2026 roofing material pricing, HomeAdvisor 2025-2026 data.

Architectural shingles make up about 80% of residential installations I see in the Pacific Northwest. They hold up better in rain and wind than 3-tab, and the price difference on a 20-square roof is only $1,000-$2,000 in materials. That upgrade is an easy sell to most homeowners.

The Line Items Most Contractors Miss

These are the costs that blow up estimates when you forget them:

• Ice and water shield - Required on eaves in cold climates. Runs $50-$100 per roll (about 2 squares per roll). A 20-square roof might need 3-4 rolls just for eaves and valleys.
• Synthetic underlayment - $50-$75 per roll covering 4-10 squares depending on product. Don’t confuse this with felt paper pricing.
• Starter strip shingles - Not the same as cutting regular shingles. Pre-made starter runs $30-$45 per bundle, and you need enough for the entire eave and rake perimeter.
• Ridge cap shingles - Sold separately from field shingles. Budget $35-$50 per bundle, covering about 20 linear feet each.
• Drip edge - $3-$8 per 10-foot length. Easy to overlook, required by code in most areas.
• Dumpster rental - $350-$600 for a 20-yard roll-off, which handles most single-layer tear-offs on homes under 25 squares.
• Permit fees - Varies by municipality, typically $100-$400 for a reroof. Some areas require it, some don’t. Check before you bid.

Worked Example 1: Standard 20-Square Reroof (Architectural Shingles)

Here’s a real-world estimate for a single-story ranch home, 4/12 pitch, one layer of old shingles.

21 squares ordered = 20 squares measured + 5% waste overage.

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That works out to about $6.89 per square foot installed. At a 35% markup, you’d present this to the homeowner at roughly $18,600. That’s competitive for architectural shingles in the PNW market.

Worked Example 2: Steep Pitch, Two-Layer Tear-Off (3-Tab to Architectural Upgrade)

This one’s trickier. Two-story colonial, 8/12 pitch, two layers of old 3-tab shingles, homeowner wants to upgrade to architectural. Roof area: 28 squares.

30 squares ordered = 28 measured + 7% waste (extra for steep pitch cuts).

Notice the labor jumped from $250 to $375 per square. Steep pitch slows production. My crews on an 8/12 can only lay about 3-4 squares per day versus 5-6 on a walkable roof. That labor increase isn’t padding - it reflects the real time difference.

Labor Rates: What Actually Drives the Number

Labor is typically 40-60% of a shingle replacement estimate. According to BLS data for roofers (occupation code 47-2181), the median hourly wage is around $23, but that’s the base rate before burden. Once you add workers’ comp, FICA, insurance, and benefits, you’re looking at a loaded rate of $35-$50 per hour per crew member.

For a deeper breakdown of production rates and crew pricing, check our guide on roofing labor cost per square.

Source: HomeAdvisor 2025, Angi 2026 roofing labor guides.

Don’t Forget the Add-Ons

Some items aren’t part of the shingle replacement itself but come up on almost every job:

• Gutter replacement - If the gutters are 20+ years old and you’re tearing off anyway, now’s the time. Aluminum gutters run $7-$20 per linear foot installed.
• Soffit and fascia - Rot behind the gutters is common on older homes. Replacement runs $6-$20 per linear foot.
• Chimney flashing - If the existing flashing is lead or corroded, budget $500-$1,800 for new step and counter flashing.
• Skylights - Existing skylights should get new flashing kits at minimum ($150-$300 each). Full skylight replacement adds $1,500 to $4,500 per unit to your roofing estimate.

I always price these as optional line items on the estimate. Give the homeowner the choice. Some will say yes, and that’s added revenue on a job you already have. Others will decline, and that’s fine. But if you don’t mention it and they find out later it should’ve been addressed, that’s on you.

Regional Pricing: Why Your Numbers Will Vary

Everything in this guide reflects national averages. Your actual numbers depend on where you work.

• Pacific Northwest - Higher labor rates, rain delays common. Add 10-15% over national average.
• Southeast - Lower labor, but hurricane-rated shingles and code requirements add material cost.
• Northeast - Ice and water shield requirements add $400-$800 to every job. Cold weather installation premiums in winter.
• Mountain states - Material delivery charges for remote areas. Snow load requirements may require heavier shingles or additional structure.

All cost estimates in this post are based on 2026 national averages. Your local pricing will vary based on labor market conditions, material availability, and building code requirements.

Five Mistakes That Kill Shingle Replacement Estimates

1. Not walking the roof. Satellite measurements are a starting point. They don’t show soft spots, curled shingles on the second layer, or chimney condition. Get up there.

2. Forgetting waste factor. A simple hip roof might waste 5-7% of material. A complex roof with dormers and valleys can waste 12-15%. I’ve had jobs where the waste was closer to 20% because of all the cuts around dormers.

3. Pricing from old supplier quotes. Shingle prices moved significantly in 2024 and 2025. Get a current quote from your supplier before building any estimate. Last year’s numbers could be off by 15-20%.

4. Not accounting for deck repairs. Once the shingles come off, you’ll find bad plywood. Budget at least a 2-4 sheet allowance ($50-$65 per sheet installed) on every estimate. On homes over 30 years old, double that.

5. Leaving out the follow-up plan. You send the estimate and then what? Half the jobs contractors lose aren’t because the price was wrong. The homeowner just went with whoever followed up first. That’s money left on the table.

FAQ

How many squares of shingles does the average house need?

The average single-family home in the U.S. has a roof area of 17-20 squares (1,700-2,000 sq ft). Two-story homes with complex rooflines can run 25-35 squares. Always measure rather than guessing from the floor plan, since pitch multiplies the actual surface area.

Should I estimate for a tear-off or overlay?

Always estimate tear-off unless the existing roof is a single layer in good condition and local code allows overlays. Most manufacturers void warranty coverage on overlay installations, and the added weight stresses the structure. A tear-off costs $100-$175 per square but gives you a clean deck to inspect.

How much waste should I add to a shingle estimate?

For a standard gable roof, add 5-7% waste. For hip roofs, 7-10%. For complex roofs with valleys, dormers, and multiple penetrations, budget 10-15%. This covers cuts, damaged bundles, and pattern matching on architectural shingles.

What’s the difference between a roofing square and a square foot?

One roofing square equals 100 square feet. Roofing materials - shingles, underlayment, tear-off labor - are all priced per square. Three bundles of architectural shingles typically cover one square. When you see “$150 per square,” that means $1.50 per square foot.

How long does a shingle replacement take?

A 20-square roof with one tear-off layer takes a 3-4 person crew about 2-3 days in good weather. Steep pitch, multiple layers, or extensive deck repairs can stretch that to 4-5 days. Weather delays are always a factor, especially in the PNW where I work.

Build Your Shingle Estimate the Right Way

Getting the estimate right is only half the job. The other half is presenting it professionally and following up before the homeowner goes with another contractor. EstimationPro doesn’t just help you build the estimate - it turns your numbers into a polished proposal, then automatically follows up with the homeowner on day 1, day 3, and day 7 so you win more of the bids you already send. Try EstimationPro free and see how fast you can go from measurement to signed contract.