How to Compare Roofing Estimates Without Getting Misled

When your roof needs work, getting an estimate shouldn’t feel like decoding a secret language. We know homeowners in the northwest suburbs read a lot of articles and get a dozen numbers tossed at them, and it’s easy to focus only on the bottom line. At Peterson Roofing, we want to help you compare roofing estimates confidently especially if you live in places like Mount Prospect or anywhere in the Chicagoland area. Below is a step-by-step guide you can use to compare bids the right way, spot what’s missing, and get the roof you actually need, not just the lowest sticker price.

Start with the right mindset: it’s not always apples to apples

The single most important idea to understand is this: two estimates that look similar in total price are often very different in scope. A low bid may omit key materials, skimp on underlayment, or assume a cheaper installation method. A higher bid may include full tear-off, premium underlayment, upgraded flashing, and a clear workmanship warranty. Price is important but only after you compare what the number actually covers. Local roofing pros, including our team, recommend comparing estimates line-by-line and asking for clarification on anything vague.

The three big things to confirm first

When you glance at an estimate, check these three items right away. If they’re missing or vague, stop and ask questions.

1. Scope of work: Is this a full tear-off, a partial replacement, or a simple repair? Does the estimate list the number of roof layers that will be removed? A complete scope should name every major task. Make sure there are no upcharges for layers, pitch or stories.
2. Materials and brands: What brand and type of shingle or underlayment are included? Are accessories (ridge cap, starter strip, flashing, drip edge) listed by name? Brand matters because warranties and performance vary.
3. Warranties and workmanship: What does the contractor warranty cover and for how long? Are there manufacturer and installer warranties? Ask for the exact warranty documents to read before you sign. Be sure warranties are separate, legal documents, not just line items on the contract.

If any of those three items are vague or missing, the overall price can be misleading. The missing items are often more important than the ones that are spelled out.

Line-by-line checklist: what to look for in every estimate

Use this checklist to compare estimates side-by-side. Read the item description, not only the price.

• Tear-off / number of layers removed: Removing the old roof down to the deck is the best practice. Some bids will say they’ll “overlay” existing shingles. Overlays can be cheaper now but create problems later. Ask whether the price assumes removal and disposal of the existing material.
• Roof deck inspection and replacement: Will the crew inspect and replace damaged plywood or roof boards? Some bids include a small allowance for decking repair; others will bill time and materials later. Get clarity.
• Underlayment type and coverage: Is a synthetic underlayment used, or basic felt? Does the estimate include ice & water shield in valleys, eaves, and vulnerable areas? What type of ice & water shield is being used? This is essential in our climate because ice dams and freeze-thaw cycles can cause leaks.
• Ventilation and attic considerations: Proper intake and exhaust ventilation extend shingle life and reduce attic moisture. It also validates manufacturer warranties. Check whether the estimate lists ridge vents, soffit vent replacement, or baffle installation.  Often, installing a ridge vent without addressing intake ventilation can cause more issues. If the roofer ignores ventilation, ask why.
• Flashing details: Flashing around chimneys, skylights, valleys, and plumbing stacks prevent leaks. The estimate should state what type of flashing (step, counter, metal) and whether existing flashing will be replaced or repaired.
• Starter shingles, ridge cap, and hip materials: These small parts are often left off cheap bids but they protect the edges and high points. Confirm whether they’re included and what style will be used.
• Cleanup and jobsite protection: Will the crew use magnetic sweeps, tarps, and protect landscaping? Will a dumpster be placed on your driveway or are company dump trucks being used? If a dumpster is used, who is responsible for any damage to the driveway? Ask whether cleanup is part of the final price.
• Permits and inspections: Does the estimate include permit fees and coordination with local village inspections? A reputable local roofer should handle permits for you.
• Timeline and payment schedule: What are the expected start and completion windows? What deposit is required? Avoid large upfront cash demands; reputable contractors explain a fair payment schedule in writing.

When you compare estimates, make a column in your head (or on paper) for each of these items and mark whether each bid includes, excludes, or leaves the detail vague. The bids that answer most of the checklist items clearly are the ones you should trust.

Common omissions that cause the biggest surprises

A surprising number of homeowner headaches come from items that weren’t included in the estimate. Watch out for these items; they’re commonly left out to make a price look lower.

• Ice & water shield in critical areas: Not including this where ice dams form can lead to leaks. Make sure critical zones are protected. Also make sure to ask what ice & water shield is being used. Not all ice & water shields are created equal and in our climate, it is essential that this item performs as intended.
• Decking replacement allowance: In most cases, decking replacement will be charged by the piece or by foot. Make sure this is clearly stated in the estimate.  Be sure they are replacing any rotted or deteriorating decking.  Ask what type of decking will be used, OSB board or 4-ply CDX plywood?
• Proper flashing or metal work: Cheap bids sometimes plan to reuse old flashing or install minimal metal work. Are they using aluminum or a strong steel flashing? Reusing existing metal or using aluminum flashing saves money now but invites future leaks.
• Ventilation upgrades: If your attic has poor ventilation, a new roof won’t perform as intended. A full, honest estimate will note current ventilation and recommend solutions as needed.
• Removal of chimney or skylight flashings: Sometimes penetrations require new collars or counter-flashing. If the estimate doesn’t describe the treatment, ask.

If a proposal is missing any of these items, ask for a revised, itemized version that spells out what’s covered and what’s not.

Questions to ask every roofer before you sign

Before you commit, ask the contractor to walk you through these specific items and insist on written answers or a revised estimate that includes the explanation.

• “Does this price assume tear-off to deck or overlay?”
• “What brand and type of underlayment and shingles are included?”
• “Where will ice & water shield be installed? and what brand will be used?”
• “Will bad decking be replaced and at what cost? What type of decking will be used?”
• “Who handles permits, and is that included?”
• “What cleanup measures will you use to protect my yard and landscaping?”
• “What warranties are included? May I see the actual warranty documents?”
• “Who will manage the project on site and how will I communicate with them?”

A contractor who can answer those questions clearly and revise the estimate on the spot is likely to be straightforward during the job too. If answers are evasive, treat that as a red flag.

How to compare two or three estimates

1. Line them up: Put the estimates side by side. Compare the scope, not just the total.
2. Highlight differences: Use a highlighter (mentally or on paper) for anything one bid includes that another doesn’t. The differences, not the totals, reveal value.
3. Ask for clarifications in writing: If one bid is cheaper because it leaves out ice & water shield or flashing replacement, ask the contractor to add those items so you can compare apples to apples.
4. Adjust for materials: If one bid includes a premium shingle, check the manufacturer warranty and life expectancy. Sometimes the more expensive shingles are worth the money, sometimes not.
5. Think long term: Consider projected maintenance, ventilation, and how the installation affects warranty coverage. A firm that stands behind their work and offers a clear workmanship warranty adds real value.

Red flags that mean “walk away”

• Very low price with vague scope: If the price looks too good to be true and the proposal is thin on details, it probably is.
• Large cash-only requests: Reputable contractors provide contracts, accept checks or credit, and have verifiable business records.
• No local references or refusal to show completed jobs nearby: Local work visibility matters. We recommend checking recent project photos and driving by when possible. Ask to see their crews in action.
• Unwillingness to provide warranty paperwork: If they won’t give you the actual warranty form, that’s a problem. Avoid warranties that are just a line item on the contract.

Local considerations for Mount Prospect and the northwest suburbs

Our winters have freeze-thaw cycles and heavy wet snow that are hard on roofs. That makes underlayment choices, ice & water protection, and proper ventilation especially important in this region. Local contractors who work in the northwest suburbs understand village inspection rules and the kinds of details (edge metal, valley treatments, attic ventilation) that keep roofs performing for decades. Pick a contractor who can show work nearby and explain how their choices keep your home safer in local weather.

Why transparent estimates save money in the long run

A clear estimate protects you from surprise costs and gives you a measure of control. When every major item is listed, and when a contractor explains why each item matters, you can make informed tradeoffs. Saving a few hundred dollars today by skipping proper flashing or underlayment often costs thousands later in repairs. We believe in being transparent because we’d rather earn your trust upfront then stand behind the roof for years to come.

Final checklist before signing

Before you sign, make sure these are in writing:

• Scope of work (including tear-off vs. overlay)
• Exact brands and types of shingles, underlayment, and accessories
• Where ice & water shield will be installed
• Decking replacement policy and unit costs if needed
• Flashing and metal work details
• Ventilation plan and attic recommendations
• Cleanup and protection plan for landscaping
• Timelines and payment schedule
• Copies of manufacturer and workmanship warranties
• Permit handling and inspection coordination

If everything above is spelled out and makes sense, you can compare estimates confidently not just by price, but by real value.

If you want help, here’s how we do it at Peterson Roofing

We write itemized proposals that list the brand and product, the underlayment, the number of layers removed, and a clear warranty promise. We work with homeowners across Mount Prospect and the northwest suburbs to explain the differences between bids and help them make a decision based on long-term performance, not impulse. If you’d like, we’ll walk through your estimates with you and point out where the real differences are. We want you to get the right roof for your home and budget.