Knowing how to choose a solar installer is one of the most important decisions you’ll make in the entire solar journey. A well-qualified installer protects your investment, ensures your system performs as promised, and keeps your roof and home safe for decades. A poor one can leave you with shoddy workmanship, voided warranties, and no one to call when something goes wrong.
This guide walks through every step of the vetting process — from checking credentials to spotting contract red flags — so you can hire with confidence.
Key Credentials to Verify Before You Hire
NABCEP Certification
The single most important credential to look for is NABCEP (North American Board of Certified Energy Practitioners) certification. According to the U.S. Department of Energy, NABCEP is widely recognized as the gold standard certification among renewable energy system installers. NABCEP has grown over more than a decade into a global certification leader, offering Board Certifications built on rigorous standards developed by subject matter experts to meet the real-world needs of customers, businesses, utilities, and government organizations.
Ask specifically whether the technicians who will physically install your system hold NABCEP credentials — not just the company’s sales staff. According to the U.S. Department of Energy, homeowners should also verify that any subcontractors used on the project hold proper credentials. A NABCEP-certified installer signals that the person on your roof has demonstrated a high level of technical knowledge and practical experience.
Licensing and Insurance
Every state has its own licensing requirements for solar and electrical contractors. Before signing anything, confirm that the installer holds:
- A valid state contractor’s license (electrical and/or roofing, depending on your state)
- General liability insurance to cover property damage during installation
- Workers’ compensation insurance to protect you if a crew member is injured on your property
You can verify licensing status directly through your state’s contractor licensing board website. If an installer cannot provide proof of insurance on request, walk away.
Years of Experience and Track Record
According to the U.S. Department of Energy, a good rule of thumb is to work with companies that have at least three years of experience in solar installation. Ask how many residential systems they have completed — a company with hundreds of local installations has a proven track record you can investigate. Newer companies aren’t automatically disqualified, but they should be able to demonstrate the experience of their lead technicians.
Local vs. National Solar Companies
Both local installers and large national companies have genuine advantages. Understanding the trade-offs helps you make the right call for your situation.
| Factor | Local Installer | National Company |
|---|---|---|
| Familiarity with local permits & utilities | High | Varies |
| Accountability & reputation | Easier to verify locally | Harder to assess regionally |
| Pricing | Often competitive | May offer volume discounts |
| Warranty service after installation | Typically hands-on | May rely on third-party service |
| Risk if company closes | Lower | Higher (some nationals have folded) |
A local installer often has deeper relationships with your utility company and permitting office, which can speed up the solar installation process. On the other hand, some national companies offer strong manufacturer partnerships and financing programs. Either way, the credentials and contract terms matter more than company size.
How to Get and Compare Multiple Quotes
According to the U.S. Department of Energy, homeowners should obtain at least three bids for a solar PV system installation. Critically, all bids must cover the same system size and components to allow a fair comparison. If one quote is for a 7 kW system with premium panels and another is for a 6 kW system with budget modules, you’re not comparing apples to apples.
When requesting quotes, provide each company with the same information:
- Your last 12 months of electricity bills
- Your roof type, age, and approximate square footage
- Any shading issues (trees, chimneys, neighboring structures)
- Your preferred financing approach (cash, loan, lease)
Each quote should return an itemized breakdown that includes panel brand and model, inverter type, system size in kilowatts, estimated annual production in kWh, total installed cost, and applicable incentives. Understanding the full solar panel cost — not just the headline number — is essential before committing.
Pro tip: Ask each installer to explain why they chose the specific equipment they’re proposing. A knowledgeable installer will give you a clear, confident answer. Vague responses are a warning sign.
Installer-Provided vs. Third-Party Equipment
Some installers sell proprietary equipment or have exclusive partnerships with specific manufacturers. Others source panels and inverters from a range of third-party brands. Neither approach is inherently better, but you should understand what you’re getting.
Ask for the brand names and model numbers of the panels and inverters being proposed, then research them independently. Look for panels with at least a 25-year performance warranty and inverters with a 10–12 year warranty (extendable on many models). Confirm that the manufacturer has a stable history — a warranty is only as good as the company standing behind it.
Warranty Coverage: What to Expect
Solar warranties come in two distinct categories, and you need both:
Equipment warranties cover the panels and inverters against manufacturing defects. These are provided by the equipment manufacturer, not the installer.
Workmanship warranties cover the quality of the installation itself — roof penetrations, wiring, mounting hardware, and system performance. This warranty comes from your installer. According to the U.S. Department of Energy, you should ask specifically what warranty coverage exists after installation and who is responsible for honoring it.
A reputable installer typically offers a workmanship warranty of at least 10 years. Be cautious of any company offering less than five years of workmanship coverage. Once your system is running, understanding solar panel maintenance responsibilities — and who covers what — will help you protect that warranty long-term.
Contract Red Flags to Avoid
Pressure Tactics and Urgency
According to the FTC Consumer Alert on solar and clean energy scams, legitimate businesses do not pressure consumers to act immediately. If a sales representative insists that a price is only valid “today” or rushes you to sign before you’ve had time to review the contract, treat it as a serious red flag.
Demands for Unusual Payment Methods
The FTC explicitly warns that demanding payment via cash, gift card, wire transfer, payment app, or cryptocurrency is a hallmark of fraudulent solar operators. Reputable installers accept standard payment methods and typically require a modest deposit — not full payment upfront.
”Free Solar” Claims
The FTC is direct on this point: offers of “free” or “no cost” solar panels are scams. The federal government does not install solar systems in homes for free, and claims of large government rebates or utility company enrollment programs that eliminate all costs are common deceptive tactics. If it sounds too good to be true, it is. Real solar tax credits and incentives reduce your costs meaningfully — but they don’t make solar free.
Vague or Missing Warranties
Any contract that references “standard warranty coverage” without specifying the duration, what’s covered, and who is responsible is a problem. Insist on written warranty terms before signing.
No Itemized Pricing
A contract that lists only a single total price — with no breakdown of equipment, labor, permits, and other costs — makes it impossible to evaluate what you’re actually paying for. Demand a line-item quote.
Questions to Ask Every Installer Before Signing
Use this solar installer checklist to guide your conversations:
- Are your installers NABCEP certified? Can I see proof?
- How many residential solar systems have you installed in this area?
- Will you use subcontractors? If so, who are they and what are their credentials?
- What specific panels and inverters are you proposing, and why?
- What is your workmanship warranty, and what does it cover?
- How do you handle roof leaks or damage that occur after installation?
- Who pulls the permits, and how long does the permitting process typically take?
- What incentives do I qualify for, and will you help me claim them?
- What financing options do you offer, and what are the full terms?
- Who do I contact if something goes wrong after installation?
According to the U.S. Department of Energy, a trustworthy installer will be transparent about the process and willing to answer all of these questions at any time. Evasiveness or irritation at being asked is itself a warning sign.
How to Verify an Installer’s Credentials
Don’t rely solely on what a company tells you about itself. Independent verification takes only a few minutes and can save you from a costly mistake.
State licensing boards: Search your state’s contractor licensing database by company name or license number. Confirm the license is active and covers the appropriate trade categories.
Better Business Bureau (BBB): Check the installer’s BBB profile for complaint history, how complaints were resolved, and their overall rating. A pattern of unresolved complaints is a serious concern.
Google and Yelp reviews: Read recent reviews carefully, paying attention to comments about post-installation support, communication, and whether the system performs as promised. Be skeptical of profiles with only five-star reviews and no detail.
NABCEP’s online directory: NABCEP maintains a public directory of certified professionals. You can search by name or location to confirm that the credentials an installer claims are legitimate.
References: Ask for contact information for two or three recent local customers and actually call them. Ask whether the installation was completed on time, whether the system is performing as projected, and whether they’d hire the company again.
Understanding Your Financing Options
The installer you choose will often present financing options alongside their quote. Before accepting any financing through an installer, compare it against independent solar financing options — including solar loans, leases, and power purchase agreements. Installer-arranged financing can be convenient, but the terms vary widely and the interest rate or lease structure significantly affects your long-term savings.
Putting It All Together
Choosing the right solar installer comes down to three things: verified credentials, transparent communication, and a contract that protects you. Work with a NABCEP certified solar installer who has a proven local track record, get at least three itemized quotes, and never let sales pressure rush you into a decision.
Take the time to understand the full solar installation process so you know what to expect at every stage — from site assessment and permitting through interconnection and final inspection. An installer who walks you through each step without being asked is one worth trusting.
The solar industry has many excellent, ethical companies. A little due diligence upfront ensures you find one of them.