Choosing a solar installer is a bigger decision than most homeowners realize. The panels and inverters you’re buying are relatively standardized products. The installation quality, warranty backing, and post-installation support vary enormously from one company to the next, and they’re far harder to evaluate from a quote than the hardware itself.

A poorly installed solar system can void equipment warranties, leak through the roof, underperform for years before anyone notices, and be nearly impossible to get fixed if the installer has gone out of business. A well-installed system from a reputable company runs quietly for 25 years with little intervention. Here’s how to tell the difference before you sign.

Verify Licensing and Insurance

Solar installation involves both electrical work and roof penetrations. In every state, this requires licenses: at minimum a general contractor’s license or electrical contractor’s license, depending on the state. Many states have additional solar-specific licensing requirements.

Ask any installer for their license number and verify it through your state’s contractor licensing board. This takes two minutes online and instantly filters out unlicensed operators. An unlicensed installer can void your homeowner’s insurance coverage for work they performed.

Also confirm the installer carries general liability insurance and workers’ compensation. If a worker is injured on your roof and the company doesn’t carry workers’ comp, you could be liable. Ask for a certificate of insurance, not just their word that they’re covered.

Look for NABCEP Certification

The North American Board of Certified Energy Practitioners (NABCEP) offers the industry’s most rigorous professional certification for solar installation. NABCEP-certified installers have passed a comprehensive exam and must maintain continuing education to keep the credential.

You don’t need every crew member to be NABCEP-certified, but a company that employs NABCEP Board Certified Professionals and prominently discloses this is demonstrating a commitment to installation quality that non-certified companies may not match. Look for the NABCEP logo on the company’s website, or ask directly whether they employ NABCEP-certified professionals.

Check Their Installation Track Record

Ask how long the company has been installing solar and how many residential systems they’ve completed. A company with 500 residential installations and a 4.8-star rating across dozens of verified reviews is a different proposition from one with 20 installations and limited review history.

Check Google reviews, the Better Business Bureau, and your state’s contractor licensing board for complaints. Look specifically for reviews that mention post-installation issues and how the company responded. Every installer has the occasional problem; what distinguishes good companies is how they handle problems after the check clears.

Ask for references you can contact directly. A company confident in their work will readily provide homeowners who installed 2-3 years ago and are happy to discuss how the system is performing and whether any issues were resolved promptly.

Evaluate the Workmanship Warranty

Panel manufacturers and inverter manufacturers back their own hardware. The installer backs the quality of the installation itself through a workmanship warranty. This covers roof penetrations, mounting hardware, wiring quality, and any defects in how the system was put together.

Industry standard workmanship warranties run 5-10 years. The best installers offer 25 years. A one-year workmanship warranty is a red flag: installation problems like slow leaks or loose connections often don’t show up in year one.

Ask whether the workmanship warranty is backed by third-party insurance. If it is, the warranty survives even if the company goes out of business. If it’s just the company’s promise, a company failure leaves you unprotected.

Understand Who Actually Does the Installation

Some solar companies sell and design systems but subcontract the physical installation to crews they don’t directly employ. This isn’t automatically bad, but it introduces variables. Ask directly: does your company employ your installation crews, or do you subcontract? Who is the electrician of record? What quality control happens on site?

Large national solar brands often use local subcontractors. Local and regional installers more commonly use direct employees. Neither model guarantees quality, but direct employment gives the company more control over installation standards, and it’s easier to hold them accountable when something goes wrong.

Compare the Equipment Being Offered

Not all solar quotes propose the same equipment. Compare panel brand, model, and efficiency across quotes. Compare inverter type and brand. Ask why they’re recommending the specific equipment they’re proposing.

A quality installer should be able to explain the trade-offs between equipment choices and tailor the recommendation to your roof, budget, and goals. If the answer to every question is “this is what we install,” without regard for your specific situation, that’s worth probing further.

Be cautious about installers who push heavily toward the most expensive equipment without explaining the payback period advantage (if any). Premium panels and microinverters cost more and may or may not be worth the premium depending on your roof’s shading situation and the local equipment costs.

Get at Least Three Quotes

The solar market is competitive enough that quotes for the same roof and system size can vary by 20-30% between installers. Three quotes let you spot outliers in both directions: the suspiciously cheap bid that may cut corners and the premium bid that may be charging for brand name rather than quality.

When comparing quotes, normalize for system size and equipment quality. A $25,000 quote for a 10 kW system with Tier 1 panels and 25-year workmanship coverage is a different value proposition than a $22,000 quote for the same size with budget panels and a two-year workmanship warranty. Cost per watt and warranty terms matter as much as the headline number.

Watch for High-Pressure Sales Tactics

Solar installations are significant purchases, typically $20,000-$40,000 or more. Any installer who pressures you to sign the same day, claims the quote is only valid for 24 hours, or discourages you from getting other quotes is using tactics that legitimate companies don’t need.

Reputable installers are confident in their work and pricing. They’ll give you time to review the quote, compare it with others, and consult with anyone you want. Urgency tactics are a signal, not a buying opportunity.

Frequently Asked Questions

What credentials should a solar installer have?

At minimum, a licensed electrical contractor or general contractor (check your state’s requirements), general liability insurance, and workers’ compensation coverage. Look for NABCEP certification as an additional indicator of professional training and commitment to standards. Always verify the license number through your state’s contractor licensing board before signing.

How do I find a reputable solar installer in my area?

Start with referrals from neighbors who’ve had solar installed in the last 2-3 years. Check Google reviews, the Better Business Bureau, and EnergySage for verified installer ratings. Get quotes from at least three companies, verify licenses through your state’s contractor board, and ask each for references you can contact. Local and regional installers with established track records often provide better long-term service than national brands using subcontractors.

What is a good workmanship warranty for solar installation?

Five to ten years is the industry standard; 25 years is offered by the best installers. One year or less is a red flag. Ask whether the warranty is backed by third-party insurance, which means it remains valid even if the company closes. A workmanship warranty covers installation defects like roof leaks from mount penetrations, loose connections, and wiring issues that aren’t covered by the equipment manufacturer’s warranty.

Should I use a local or national solar company?

Both can deliver quality installations. Local and regional installers often have stronger community ties, more consistent installation crews, and more accountability to local reputation. National companies offer brand recognition and sometimes large warranty backing, but may use local subcontractors with variable quality. The track record and warranty terms of the specific company matter more than local vs. national. Check installation reviews and warranty terms regardless of company size.

What questions should I ask a solar installer?

Key questions: How long have you been installing solar locally, and how many residential systems? Are your installation crews direct employees or subcontractors? What is your workmanship warranty, and is it backed by third-party insurance? Who is the electrician of record on the permit? Can you provide references from installations completed 2-3 years ago? What monitoring system comes with the installation, and how will I know if production drops?

How many solar quotes should I get?

At least three. The solar market is competitive and quotes for the same system can vary 20-30% between installers. Three quotes let you identify the realistic market price for your installation and compare equipment and warranty terms. More than five quotes rarely adds useful information and just extends the decision timeline.

What are red flags when choosing a solar installer?

High-pressure tactics or same-day-only pricing, inability to provide a contractor license number, no workers’ compensation or general liability insurance, workmanship warranty under two years, unwillingness to provide references, vague answers about who will actually perform the installation, and production estimates that seem unrealistically high compared to other quotes.

Summing Up

Choosing a solar installer comes down to verified credentials, a track record you can check, and warranty terms you can trust. License verification takes minutes and filters out the worst operators. Checking reviews and references takes a bit longer but reveals how companies actually perform over years, not just at sale time. The workmanship warranty is your main protection against installation quality issues, so its length and backing matter. Get three quotes, compare cost per watt alongside equipment and warranty terms, and don’t let urgency tactics rush a decision that will affect your roof and electricity bill for the next 25 years.

To get connected with vetted local solar installers in your area, call (855) 427-0058 or request a free local assessment.

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