How to Read a Contractor Bid for Roofing and Siding

You've got two or three bids spread out on the kitchen table, and the numbers don't match up. One's a few thousand higher. One's suspiciously low. Which one is honest?

Learning how to read a contractor bid is one of the most valuable skills a homeowner can pick up, and it pays off every time you put money into your house. A bid isn't just a price quote, it's a preview of the contract you'll sign and the work you'll actually get. The wrong one can cost homeowners significantly more through missing scope, cheap materials, and unfinished work. Here's how to tell a solid bid from a bad one, on both roofing and siding jobs.

Why the Lowest Bid Usually Isn't the Best Bid

A bid that comes in thousands below the others isn't a gift. It's a question you need to answer. Is the scope smaller? Are the materials cheaper? Is the contractor underpricing the job to win the work while planning to hit you with change orders later?

The goal isn't to find the cheapest bid. It's to compare apples to apples. Same scope, same materials, same warranties, and then let price be the tiebreaker.

What a Complete Contractor Bid Should Include

Before you compare anything, check that each bid actually contains the basics. Anything missing here is a red flag on its own:

Legal business name, license number, physical address, and certificates of insurance (general liability and workers' compensation)
Detailed scope of work: tear-off, underlayment, flashing, ventilation, trim, cleanup, dumpster
Specific product names and manufacturers — not "architectural shingles" or "steel siding," but brand, product line, color, gauge, and profile
Labor and materials are broken out separately
Project timeline with expected start and completion dates
Payment schedule
Warranty terms: manufacturer and workmanship, listed separately
Permits and a clear statement of who is pulling them

On a steel job, a quality bid should name the specific product line by name, for example, EDCO's Arrowline or Generations HD for steel roofing, or Entex for steel siding, not just "steel." Vague material callouts are one of the most common ways contractors quietly substitute cheaper products after you've signed.

Profile matters too. EDCO's Entex siding, for example, carries a 50-year hail protection warranty. A bid that doesn't specify the profile can leave you with a product that looks similar but carries different coverage.

How to Compare Roofing Bids Line by Line

Once every bid meets the baseline, it's time to normalize them. Here's how to compare roofing bids without getting fooled by surface numbers:

Are all bids using the same material grade, gauge, and warranty tier?
Is tear-off included in all of them, or is one sneaking in a layover?
Is decking replacement priced per sheet, and at what rate? This line item alone can swing a job by thousands.
Are flashing, drip edge, ice and water shield, and ventilation included, or listed as extras?
Is the roofing contractor’s estimate priced per square, and are the square counts consistent across bids?

The same discipline applies to siding bids: same profile, same gauge, same trim package, same insulation backing, same manufacturer. If one bid quotes premium steel siding and another quotes a budget vinyl panel, they're not competing, they're different jobs.

Roofing and Siding Bid Red Flags

Even when two bids look similar on price, these warning signs can signal major differences in quality, accountability, and long-term value. These are the warning signs that should give you pause, regardless of price:

No physical business address or local presence. Some storm-chasing contractors lack an established local presence and can be difficult to reach if warranty issues come up later.
Vague material descriptions. "Premium shingles" or "high-grade steel" with no manufacturer, product line, or profile is a setup for a cheap substitution.
"We'll cover your deductible." It may be illegal depending on your state, but it is always worth scrutinizing closely, and it is usually a sign that the contractor is inflating the job elsewhere to absorb it.
Pressure to sign same-day or "this price is only good today." Legitimate contractors give you time.
Large upfront deposits. Deposit expectations vary by market and project size, but a very large upfront deposit can be a warning sign.
No written warranty, or a warranty that only lasts as long as the contractor stays in business.
Missing proof of insurance. If a worker gets hurt on your property and the contractor doesn't carry workers' comp, your homeowners' policy is the next stop.
Verbal promises are not reflected in the written bid. If it's not in writing, it doesn't exist.
Assignment of Benefits (AOB) clauses buried in the contract. Signing an AOB hands the contractor your insurance rights and can leave you locked out of decisions about your own insurance claim.
No permit pulled, or the contractor asks you to pull it as the homeowner. That's often a dodge to avoid inspection liability.

Questions to Ask Before You Sign

A few questions separate the confident bids from the shaky ones:

Who's actually on my roof? Your employees or subcontractors?
What happens if you find rotted decking or damaged sheathing mid-job?
What's your workmanship warranty, in writing, and for how long?
Who handles the manufacturer's warranty registration, and by when? Warranty registration deadlines vary by manufacturer and product. Homeowners should verify the specific registration window for the product being installed and make sure responsibility is clear in writing. Missing that window can void coverage, so get clear on whose responsibility it is.
What's your process if I have a warranty issue in five years?

Manufacturer warranties also exclude damage caused by improper installation. Which means who puts the product on your home directly affects whether your warranty holds up.

How to Find a Contractor You Can Trust

The best defense against a bad bid is starting with a short list of contractors you already know are qualified. Instead of vetting every cold-caller who knocks after a storm, start with a curated directory.

EDCO maintains a directory of qualified local contractors who install EDCO roofing and siding products. It’s a helpful place to start if you want to compare qualified installers and reduce guesswork.

When the bids are on the table and the sales pitch is on the phone, the confidence that comes from knowing what a good bid looks like is worth every minute of the reading.