How to Choose a Home Exterior Contractor: 10 Questions to Ask

Hiring a contractor for a roofing, siding, window, or deck project is one of the most consequential decisions you will make as a homeowner. The right contractor delivers quality work, communicates clearly, and stands behind the finished product. The wrong one can leave you with shoddy workmanship, unexpected costs, and a months-long headache. The difference between the two often comes down to asking the right questions before you sign a contract.

Here are 10 questions every homeowner should ask — and what the answers tell you about the contractor sitting across from you.

1. Are You Licensed and Insured in Virginia?

Why it matters: Virginia law requires contractors performing work valued at $1,000 or more to hold a valid contractor’s license from the Department of Professional and Occupational Regulation (DPOR). There are three license classes based on project value: Class C ($1,000–$10,000), Class B ($10,001–$120,000), and Class A (over $120,000). Most home exterior projects fall in the Class B range.

Insurance is equally critical. The contractor should carry general liability insurance (which covers damage to your property during the project) and workers’ compensation insurance (which covers their employees if someone is injured on your property). Without workers’ comp, an injured worker could potentially file a claim against your homeowner’s insurance.

Red flag: The contractor cannot provide a license number, gets defensive when asked, or says insurance “is not necessary for this type of work.” Verify their license yourself using the DPOR license lookup tool.

2. How Long Have You Been in Business?

Why it matters: Longevity is not a guarantee of quality, but it is a meaningful indicator. A contractor who has been operating for 10 or more years has survived economic downturns, built a reputation in the community, and presumably has the financial stability to honor warranties. New companies can certainly do excellent work, but they carry more risk — particularly when it comes to long-term warranty support.

Red flag: The company is very new but claims extensive experience. Ask follow-up questions: “Where were you working before starting this company?” and “Can I see examples of projects from your previous work?”

3. Can You Provide Local References?

Why it matters: Any contractor can show you photos of beautiful finished projects. References let you hear from actual homeowners about the full experience — communication, timeliness, cleanliness, problem resolution, and whether the finished product held up over time. Ask for references from projects completed in the last one to two years, ideally in your area.

What to ask references: Was the project completed on time and on budget? How did the contractor handle unexpected issues? Was the job site kept clean? Would you hire them again? Have you had any problems since the work was completed?

Red flag: The contractor cannot or will not provide references, or only offers references from projects completed years ago or in distant locations.

4. What Manufacturer Certifications Do You Hold?

Why it matters: Major manufacturers — like GAF and CertainTeed for roofing, James Hardie for siding, and Trex for decking — offer certification programs for contractors who meet their training and installation standards. A certified contractor has demonstrated competence with that specific product, and certification often unlocks enhanced warranties that are not available through non-certified installers.

For example, a GAF Master Elite contractor can offer GAF’s Golden Pledge warranty, which provides 50-year coverage on materials and 25-year coverage on workmanship. A non-certified installer can only offer the standard manufacturer’s material warranty with no workmanship coverage from GAF.

Red flag: The contractor claims to be “certified” but cannot specify by which manufacturer or provide documentation.

5. Do You Pull Permits?

Why it matters: For projects that require building permits — decks, porch additions, roof replacements in some jurisdictions, structural changes — the contractor should handle the permit application and schedule all required inspections. This is standard practice for reputable contractors. Pulling permits ensures the work is inspected by the county and meets building code requirements, which protects you legally and financially.

For a detailed breakdown of which projects require permits in Northern Virginia, see our building permits guide.

Red flag: “We can skip the permit to save you some money and time.” This is one of the biggest red flags in the industry. A contractor who suggests skipping permits is either unlicensed, not confident their work will pass inspection, or cutting corners.

6. What Is Your Warranty — Workmanship and Materials?

Why it matters: There are two distinct warranties on any exterior project: the manufacturer’s warranty on the materials and the contractor’s warranty on the installation (workmanship). A 50-year shingle warranty is meaningless if the shingles were installed incorrectly — manufacturer warranties typically do not cover installation defects. You need both.

Ask the contractor to clearly explain: What does your workmanship warranty cover? How long does it last? What is the process for making a warranty claim? Is it in writing?

Red flag: Vague warranty language (“We stand behind our work”), verbal-only warranties, or a workmanship warranty shorter than two years. Quality contractors typically offer 5- to 10-year workmanship warranties, and some offer longer through manufacturer certification programs.

7. Who Will Be On-Site Managing the Project?

Why it matters: The person who sells you the project is often not the person who manages the installation. You want to know who your day-to-day point of contact will be during construction. Will there be a dedicated project manager or crew leader on site? How do you reach them if you have questions or concerns?

On larger projects (full roof replacement, siding installation, deck construction), having a consistent crew leader who understands the scope and specifications is critical for quality control.

Red flag: “Our crews rotate” or an inability to tell you who specifically will be managing the work. Also be cautious if the contractor subcontracts the entire job to another company — you want to know who is actually doing the work.

8. What Is the Payment Schedule?

Why it matters: Payment structure tells you a lot about a contractor’s financial health and business practices. A reasonable payment schedule for a home exterior project typically looks like this: a deposit of 10 to 30 percent to secure the project and order materials, a progress payment at a defined milestone (such as when materials are delivered or a major phase is complete), and a final payment upon completion and your satisfaction.

Virginia law limits contractor deposits to no more than one-third of the contract price for projects under $1,000, but there is no statutory cap for larger projects. Industry best practice is to avoid paying more than one-third upfront.

Red flag: Demanding full payment upfront, requiring cash only, or pressuring you to pay before the work is complete. A contractor who needs your full payment before starting may have cash flow problems — which means they may not be around to honor their warranty.

9. How Do You Handle Unexpected Issues?

Why it matters: Exterior projects frequently uncover hidden problems — rotted sheathing under old siding, damaged roof decking under worn shingles, inadequate framing under a deck. A good contractor has a clear process for handling these discoveries: they stop work, document the issue, explain the options and costs to you, and get your approval before proceeding.

Ask the contractor to walk you through a specific example: “If you remove my old siding and find rotted sheathing underneath, what happens next? How do you price the additional work? Do I approve it before you proceed?”

Red flag: “We will just handle it” without explaining the process, or a contract that gives the contractor blanket authority to perform additional work without your approval. You should always be informed and give consent before the scope (and cost) of your project changes.

10. Can I See a Detailed Written Estimate?

Why it matters: A professional estimate should be detailed enough that you understand exactly what you are paying for. It should include: a description of the work to be performed, the specific materials to be used (brand, product line, color), quantities, labor costs (or a combined price with labor and materials broken out), permit fees, a timeline, payment terms, and warranty information.

A detailed estimate also makes it possible to compare bids apples-to-apples. If one contractor quotes $15,000 and another quotes $22,000, the estimates should tell you why — different materials, different scope, different warranty coverage.

Red flag: A one-page estimate with a single line item (“Roof replacement — $14,500”) and no detail on materials, scope, or terms. Also be wary of estimates delivered verbally — if it is not in writing, it does not exist.

Bonus Tips for Evaluating Contractors

Beyond these 10 questions, a few additional practices will help you make a confident decision:

• Get at least three estimates. This gives you a range of pricing and lets you compare how different contractors approach the same project. Be wary of the lowest bid — it often means lower-quality materials, less experienced crews, or corners being cut.
• Check online reviews, but read critically. Google reviews, Yelp, and the Better Business Bureau can provide useful signals, but no company has 100 percent perfect reviews. Look for patterns: consistent complaints about communication, cleanliness, or follow-through are more telling than a single negative review.
• Trust your instincts. If a contractor is pushy, dismissive of your questions, or pressures you to sign immediately (“This price is only good today”), walk away. A confident, established contractor does not need high-pressure sales tactics.
• Read the contract before signing. Every detail discussed verbally should be reflected in the written contract. If it is not in the contract, do not assume it is included.

Protect Yourself and Your Investment

Hiring a contractor is a significant financial commitment — exterior projects in Northern Virginia routinely cost $10,000 to $50,000 or more. Taking the time to ask these questions, verify credentials, and compare detailed estimates is not being difficult — it is being responsible. The best contractors welcome thorough questions because they know their answers will set them apart from the competition.

Your home is likely your largest investment. Treat the process of choosing who works on it with the seriousness it deserves.