How to Choose a Solar Installer: The Complete Homeowner Guide
Choosing a solar installer is one of the biggest financial decisions a homeowner can make. The company you hire affects everything from system performance and warranty protection to how smoothly the permitting process goes. With thousands of solar companies operating across the United States, narrowing the field can feel overwhelming.
This guide walks through the factors that matter most when evaluating solar installers, so you can make an informed decision and avoid common pitfalls.
Check Licensing and Insurance First
Every state requires solar installers to hold specific contractor licenses. Before anything else, verify that the company has a current, valid license for your state. You can usually check this through your state’s contractor licensing board website. Also confirm the company carries general liability insurance and workers’ compensation coverage. If an uninsured worker is injured on your roof, you could be liable.
Look for NABCEP Certification
The North American Board of Certified Energy Practitioners (NABCEP) offers the industry’s most respected credential. A company with NABCEP-certified installers on staff has demonstrated a higher level of technical knowledge and professionalism. While NABCEP certification is not legally required, it is a strong signal of quality.
Read Reviews, But Read Them Carefully
Online reviews provide useful insight, but quantity and recency matter as much as the star rating. A company with 200 reviews averaging 4.5 stars is generally more reliable than one with 10 five-star reviews. Pay attention to what reviewers mention: did the company communicate well, meet timelines, and handle permit issues? Negative reviews about post-installation support or warranty claims are particularly important red flags.
Get Multiple Quotes
Solar pricing varies significantly between installers, even for the same equipment. Getting at least three quotes helps you understand the fair market price for your area and system size. Be cautious of any quote that is dramatically lower than the others, as this may indicate corner-cutting on equipment quality or installation standards.
Understand the Warranty Structure
A solar installation involves multiple warranties. Panel manufacturers typically offer 25-year production warranties, and inverter manufacturers offer 12 to 25 years depending on the product. Separately, your installer should offer a workmanship warranty covering the installation itself, usually 10 to 25 years. Make sure you understand who to contact for each type of warranty claim and what is covered.
Ask About Their Installation Process
A reputable installer will conduct a thorough site assessment before quoting, including roof condition evaluation, shading analysis, and electrical panel inspection. Ask about their permitting timeline, whether they handle all paperwork and utility interconnection, and what happens if your roof needs repairs before installation. Companies that rush through the assessment or skip the site visit entirely should raise concerns.
Compare Equipment Options
Not all solar panels and inverters are equal. Ask each installer what equipment brands and models they offer and why. A good installer should be able to explain the trade-offs between different panel efficiencies, inverter types (string vs. microinverters), and how these choices affect your long-term production and warranty coverage.
The Bottom Line
The best solar installer for your home is licensed, well-reviewed, transparent about pricing, and willing to explain their process in detail. Take the time to compare options and ask questions. A quality installation will produce clean energy for 25 years or more, so the upfront effort to choose the right installer pays off many times over.
Ready to compare installers in your area? Browse rated solar installers on EnergyRanked.