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What Questions Should I Ask Roofing Contractors Before Hiring?
Aaron Venegaz is the President and founder of Global Exterior Experts and has been in the construction / roofing industry for over 15+ years. He started the company back in 2010 and done everything from scheduling appointments to putting down roofs. He's also done everything from commercial roofing to residential roofing and has also worked with almost every single roofing material multiple times over the past 15 years.
Comparing roofing estimates the right way comes down to one thing: understanding what each estimate actually includes. A number on a page means nothing without knowing what work is covered, what materials are specified, and what gets left out when things get complicated. Here is how to read those estimates like you know what you are doing.
Start With the Scope of Work, Not the Price
The first thing to check is the scope of work section, not the total. Two estimates can be thousands of dollars apart while describing completely different jobs. One might include full deck replacement, new ice and water shield, and updated flashing. The other might swap shingles and call it done.
Before comparing any numbers, make sure every estimate answers these questions:
- Will the old roofing material be fully removed?
- Does the price include replacing damaged decking boards?
- Is new underlayment included, and what type?
- Are valleys, ridges, and pipe boots being replaced or reused?
If an estimate does not spell these things out, ask for a revised version that does.
Understand What Materials Are Being Quoted
Not all shingles are equal. A basic 3-tab shingle and an architectural shingle are both called shingles, but they carry different lifespans, warranties, and price points. The same goes for underlayment, flashing, and ridge cap.
Here is a basic range to anchor your expectations for a standard asphalt shingle roof replacement on a typical residential home:
- 3-tab shingles: $5,000 to $9,000 (most markets)
- Architectural/dimensional shingles: $8,000 to $15,000
- Premium or designer shingles: $12,000 to $22,000+
These are broad ranges. Pitch, size, accessibility, and local labor costs all move the number. What matters is that every estimate should name the product line and shingle class, not just say "asphalt shingles."
Check for Permits and Code Compliance
Here is something that trips up homeowners more than almost anything else: permits. In most areas, a full roof replacement requires a permit. Some estimates include this cost upfront. Others bury it as an add-on. A few do not mention it at all.
Skipping the permit is not just a paperwork issue. If your home sells and the work was done without a permit, it can delay or kill the transaction. If a code inspector flags it, you may be looking at removal and redo costs.
Ask directly: Is the permit fee included in this estimate? Who pulls the permit, you or the roofing company? Who is responsible if an inspection fails?
Look at the Warranty Terms Side by Side
A roof replacement has two separate warranties: the manufacturer's material warranty and the workmanship warranty from the installing roofing company. Both matter.
Manufacturer warranties on asphalt shingles typically run 25 to 50 years, but most have prorated coverage after the first few years unless the installer is a certified contractor for that brand. Workmanship warranties vary widely, anywhere from one year to lifetime, depending on the company.
When comparing estimates:
- Ask what manufacturer warranty applies
- Ask if the company is a certified installer for that brand (this usually extends the material warranty)
- Ask what the workmanship warranty covers and for how long
- Get it in writing
Know What "Tear-Off" Really Means
Some estimates include a "re-roof over" option, meaning new shingles get installed on top of the existing layer. This costs less upfront. It also adds weight to your roof structure, can void manufacturer warranties, and hides whatever damage might be sitting underneath.
A full tear-off means the old material is stripped down to the decking. That is when you find out if there is rot, soft spots, or water damage that needs to be addressed before anything new goes on. Estimates that skip the tear-off are often cheaper for a reason.
Decking Replacement: The Cost That Surprises People
Damaged decking is one of the most common unexpected costs in a roof replacement. Some estimates include a set number of decking sheets in the base price. Others price it as a per-sheet add-on discovered during the job.
The honest answer is that no roofing company knows exactly how much decking needs replacement until the tear-off is done. What good estimates do is disclose the per-sheet replacement cost upfront, usually $60 to $100 per sheet depending on your market, so there are no surprises mid-project.
Ask each company how they handle decking. If they cannot give you a per-unit rate, that is a gap worth addressing before you sign.
Timeline and Scheduling
Alright, let's talk about timing. A full residential roof replacement typically takes one to three days for a standard home. Larger or more complex roofs may run longer. Material delays, especially for specialty shingles or metal components, can push start dates by weeks depending on the season and supply chain conditions (it happens more than people expect).
Ask each company:
- What is the estimated start date?
- How long will the job take?
- Are materials in stock or on order?
- Who is the point of contact during the job?
A company that cannot answer these questions clearly is showing you something about how they operate.
Payment Terms and Red Flags
Standard payment terms for a reputable roofing company look something like this: a deposit of 10% to 30% upfront, with the balance due upon completion. Any company asking for 50% or more before a single shingle goes up deserves a harder look.
Also watch for:
- Vague contracts with no line-item breakdown
- Pressure to sign the same day (urgency tactics are a flag, not a feature)
- No physical business address listed
- Estimates delivered verbally without written documentation
Get every agreement in writing. That applies to change orders mid-job as well.
What a Strong Estimate Should Include
To make comparison easier, here is what every written estimate from a qualified roofing company should contain:
- Full scope of work with materials named by product line and grade
- Tear-off and disposal included (or excluded with explanation)
- Decking replacement terms and per-unit rate
- Permit fees noted
- Manufacturer and workmanship warranty terms
- Payment schedule
- Project timeline and start date
- Company license and insurance information
If any of these are missing, ask for a revised estimate before comparing prices.
Summary: Compare the Full Picture, Not Just the Number
A roof replacement is one of the larger investments a property owner makes. The cheapest estimate is rarely the best one, and the most expensive is not automatically the safest bet either. The right estimate is the one that tells the full story: what work gets done, what materials go on, what happens when surprises show up, and what protections you have after the job is finished.
Get at least three written estimates. Ask the same questions to each company. When the scope, materials, and terms are aligned, then compare the numbers. That is how you make a confident, informed decision on your roof replacement.
