How to Choose a Solar Installer You Can Trust

The solar panel on your roof will last 25 to 30 years. The installer who puts it there might last 25 months. Since 2020, hundreds of solar companies have launched, scaled aggressively, and either gone bankrupt or been acquired. When your installer disappears, so does your workmanship warranty, your service agreement, and your point of contact for problems.

Choosing the right installer is the single most important decision in going solar. Here's how to do it.

Start with Licensing

Every state requires solar installers to hold a contractor's license. This is non-negotiable. Before you have a single conversation, verify the license:

California: CSLB license lookup at cslb.ca.gov. Solar requires a C-46 (Solar Energy) or C-10 (Electrical) license.
Florida: DBPR license search. Solar requires a certified or registered electrical or roofing contractor license.
Texas: TDLR license search. Electrical work requires a master or journeyman electrician license.
Other states: Search "[your state] contractor license lookup" and verify the company's license is active, not expired or suspended.

Check for complaints on the licensing board's site while you're there. A company with multiple unresolved complaints is a company you should avoid, regardless of how good their quote looks.

NABCEP Certification: What It Means

The North American Board of Certified Energy Practitioners (NABCEP) is the gold standard for solar installer certification. A NABCEP-certified installer has passed rigorous exams covering system design, installation best practices, and electrical code compliance. The certification requires ongoing education to maintain.

Does it guarantee a good installation? No. But it demonstrates that the company has at least one person on staff who understands best practices at a professional level. A company with no NABCEP-certified employees can still be competent, but you're taking on more risk.

Search the NABCEP directory at nabcep.org to verify. Ask the installer specifically which employees hold the certification and whether a certified installer will be on-site during your installation.

The 3-Quote Rule

Get a minimum of three written quotes from three different companies. This is the simplest and most effective way to avoid overpaying and to identify outliers. When comparing quotes, look at:

Price per watt. Divide the total system cost by the system size in watts. The national average in 2026 is $2.75 to $3.25 per watt for cash purchases. If one quote is $4.50/watt and the others are $3.00/watt, that's a red flag, not a quality premium.
Equipment specifications. Are they quoting the same tier of panels? A Tier 1 panel (REC, Canadian Solar, Qcells) at $3.00/watt is a better deal than a no-name panel at $2.50/watt. Compare panel wattage, efficiency ratings, and warranty terms.
Inverter type. Microinverters (Enphase IQ8+) cost more than string inverters (SolarEdge, Fronius) but offer panel-level optimization, longer warranties, and easier troubleshooting. Make sure you're comparing equivalent configurations.
Production estimates. Each installer should provide an estimated first-year production in kWh based on a site-specific analysis. If one estimate is 30% higher than the others on the same roof, they're inflating projections to win the deal.

Read the Contract, Not the Sales Pitch

The proposal is marketing. The contract is what you're actually agreeing to. These are different documents, and they often say different things. Before you sign:

Verify that every verbal promise from the sales rep appears in the contract. "We'll handle the roof repair" means nothing if the contract says "customer responsible for roof modifications."
Look for the production guarantee in writing — the specific kWh number, not a percentage — and the remedy if they fall short.
Check the payment schedule. Reputable installers typically require 10% to 20% at signing, with the balance due at completion and final inspection. Any company demanding full payment upfront is a risk.
Identify the dispute resolution clause. Many solar contracts include mandatory arbitration, which limits your ability to sue. Know what you're agreeing to.

In-House Crews vs. Subcontractors

This distinction matters more than most homeowners realize. Many solar companies, including some large national brands, are primarily sales organizations. They sell the system and subcontract the installation to local crews. This creates accountability gaps.

Ask directly: "Will your employees install my system, or will you subcontract the installation?" Neither answer is automatically disqualifying, but you need to know. If they subcontract, ask:

Who is the subcontractor?
Are they licensed and insured?
Who is responsible for warranty claims — your company or the sub?
Will a project manager from your company be on-site during installation?

Companies with in-house installation crews generally provide better accountability and faster warranty service.

10 Questions to Ask Every Installer

How long have you been in business, and how many systems have you installed?
Can I see your contractor's license and proof of insurance (general liability and workers' comp)?
Do you have NABCEP-certified installers on staff?
Will your crew or a subcontractor install my system?
What is your workmanship warranty term, and what does it cover?
What is the production guarantee, and what happens if the system underperforms?
What is your process for roof penetrations, and do you warranty against leaks?
What is the timeline from contract to Permission to Operate (PTO)?
Can you provide references from customers who have had their system for at least 2 years?
What happens to my warranty if your company is acquired or goes out of business?

Any installer who gets defensive about these questions is an installer you should avoid.

Red Flags That Disqualify an Installer

Same-day contract pressure. "This price is only good today" is a sales tactic, not a business reality. Walk away.
No site visit before quoting. A company that quotes a price from satellite imagery alone without inspecting your roof, attic, electrical panel, and shading in person is cutting corners at the most critical stage.
No written production guarantee. If they won't put it in writing, they don't stand behind it.
Full payment upfront. The standard is a deposit at contract, a progress payment at equipment delivery, and final payment at PTO. Full upfront payment exposes you to total loss if the company goes under.
Unlicensed or uninsured. Non-negotiable. No exceptions.
"Government program" claims. There is no government program that gives you free panels. Companies that claim otherwise are either lying or misrepresenting the federal tax credit.
They won't provide references. A company with 10 years of installations should have dozens of happy customers willing to vouch for them. If they can't produce any, ask why.

Bottom Line

The best solar panel in the world is worthless if it's installed poorly. Verify the license, get three quotes, confirm NABCEP certification, ask who actually does the work, and read the contract line by line. The installer who earns your business with transparency and documentation — not pressure and promises — is the one most likely to be around in 10 years when you need them.