How to Choose a Solar Installer: Complete Checklist for 2026

Choosing the Right Installer

Understand what you're buying first. Read our step-by-step installation guide.

Selecting the right solar installer is arguably the most important decision in your solar journey. A quality installer ensures proper system design, code-compliant installation, reliable long-term performance, and responsive service if issues arise. Conversely, a poor installer can create safety hazards, roof leaks, underperforming systems, and warranty nightmares that cost far more than any initial savings from a low bid.

The solar installation industry includes thousands of companies ranging from small local contractors to large national corporations, with quality varying dramatically across the spectrum. This comprehensive checklist provides a framework for evaluating potential installers, identifying red flags, and selecting a partner who will deliver a safe, high-performing system that meets your expectations for decades.

10 Must-Verify Items

Before considering any installer, verify these fundamental qualifications:

1. State Licensing: Solar installers must hold appropriate contractor licenses in your state, typically electrical contractor, general contractor, or specialized solar contractor licenses. Verify licenses are current and in good standing through your state's contractor licensing board. Unlicensed contractors may void equipment warranties and leave you without recourse if problems arise.

2. Insurance Coverage: Require proof of general liability insurance ($1 million minimum) and workers' compensation insurance. Without adequate coverage, you could be liable for injuries occurring on your property or damage caused during installation. Request certificates of insurance directly from the insurance carrier to verify coverage.

3. NABCEP Certification: The North American Board of Certified Energy Practitioners (NABCEP) offers the solar industry's most respected certification. NABCEP-certified installers have demonstrated competency through rigorous training, experience requirements, and examinations. While not mandatory, NABCEP certification indicates professional commitment and technical expertise.

4. Years in Business: Choose installers with at least 3 to 5 years of operational history. Solar companies have high failure rates, and you need confidence your installer will exist to honor warranties and provide service. Longevity indicates financial stability and satisfied customers. Request references from installations completed 3+ years ago to verify ongoing performance.

5. Local Reviews and Reputation: Check online reviews on Google, Better Business Bureau, Yelp, and solar-specific platforms like SolarReviews and EnergySage. Look for patterns in reviews rather than isolated complaints. Consistent praise for communication, workmanship, and responsiveness indicates a reliable installer. A few negative reviews are normal; consistent complaints about the same issues are red flags.

6. Workmanship Warranty: Quality installers stand behind their work with workmanship warranties of 5 to 10 years covering installation quality, roof penetrations, and electrical work. This warranty is separate from equipment manufacturer warranties and is your protection against installation errors. Get warranty terms in writing.

7. Tier 1 Equipment: Reputable installers use Tier 1 solar panels and quality inverters from established manufacturers. Tier 1 designation indicates manufacturers with strong financial stability, advanced manufacturing processes, and consistent quality. Avoid installers pushing unknown brands or discontinued product lines that may lack warranty support.

8. Monitoring Included: Modern solar systems include monitoring platforms that track production through smartphone apps and web portals. Verify that monitoring is included in your proposal and that you'll have full access to production data. Monitoring enables early detection of performance issues and verifies production guarantee compliance.

9. No Pressure Tactics: Quality installers provide thorough proposals and give you time to review and compare. Be wary of high-pressure sales tactics, limited-time offers designed to prevent comparison shopping, and door-to-door salespeople using fear-based messaging about rate increases or incentive expirations. Legitimate incentives rarely require immediate decisions.

10. Detailed Written Quote: Insist on detailed written proposals specifying equipment brands and models, system size, expected production, total cost, available incentives, financing options, warranty terms, and timeline. Vague quotes or proposals with missing details suggest either inexperience or intentional obfuscation.

Red Flags: When to Walk Away

Certain behaviors and characteristics should immediately disqualify an installer from consideration:

• No Physical Office: Installers operating only from a truck or PO box may disappear when problems arise. Visit their office to confirm legitimate business operations.
• Full Payment Upfront: Reputable installers use milestone-based payments, typically a small deposit (10-20%), progress payment at installation, and final payment upon PTO. Never pay 100% upfront.
• Pressure to Sign Immediately: "Today only" pricing, claims that incentives expire tomorrow, or refusal to let you take proposals home for review are classic high-pressure tactics.
• Quotes 20%+ Below Competitors: Dramatically low pricing often indicates corner-cutting on equipment, inexperienced labor, skipped permits, or hidden costs added later.
• Requests to Skip Permits: Any installer suggesting unpermitted work should be reported to authorities, not hired. Unpermitted installations create safety hazards, insurance problems, and home sale complications.
• No References Available: Legitimate installers happily provide references from recent customers. Refusal suggests unhappy customers or lack of experience.
• Unwilling to Put Promises in Writing: Verbal promises about production, timelines, or costs are meaningless. Everything should be documented in your contract.

Evaluating Proposals

Warranty terms matter. See our solar warranties guide to compare protection levels.

Once you've verified qualifications, compare proposals from at least three installers. Key comparison points include:

Price per Watt: Divide total system cost by system size in watts to compare pricing. In 2026, $2.50 to $3.50 per watt is typical for residential installations before incentives. Extremely low or high prices warrant investigation.

Equipment Quality: Compare proposed panels and inverters. Higher efficiency panels, microinverters, or premium string inverters cost more but may deliver better long-term performance. Research proposed equipment independently.

Expected Production: Compare annual kWh production estimates. If one proposal shows dramatically higher production than others for the same system size, their assumptions may be overly optimistic.

Total Savings and Payback: Compare 25-year savings projections and simple payback periods. Consider whether assumptions about electricity rate inflation and incentive availability seem realistic.

Financing Terms: If financing, compare interest rates, loan terms, dealer fees, and monthly payments. Lower monthly payments with excessive fees or long terms may cost more over time.

Questions to Ask References

When contacting installer references, ask specific questions:

• Did the installer complete work on schedule?
• Did final cost match the quoted price?
• How has actual production compared to estimates?
• Did you encounter any problems, and how were they resolved?
• Were crews professional and did they clean up properly?
• Have you had any roof leaks or electrical issues?
• Would you hire this installer again?

Making Your Final Decision

Compare national and local companies in our solar company reviews guide.

After thorough evaluation, choose the installer who offers the best combination of fair pricing, quality equipment, demonstrated competency, and responsive communication. The lowest bid is rarely the best value if it comes from an installer lacking qualifications or cutting corners. Similarly, the highest bid isn't necessarily best unless it clearly delivers superior equipment or service.

Trust your instincts. The installer you choose will be working on your home and serving as your long-term partner for system maintenance and warranty support. Choose someone who communicates clearly, answers questions patiently, and demonstrates genuine expertise rather than slick sales tactics. A quality installer will be your advocate throughout the solar journey and ensure your system delivers the savings and performance you expect for decades to come.