How to choose a solar installer

Learn how to ask about key factors like certification, experience, warranties, and service offerings to find the right solar installer for your home system.
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Dash Lewis

Last updated: October 11, 2025

Key points

Choose a NABCEP-certified installer when possible.
Ensure your solar installer manages key processes like permitting, inspection, and grid connection, and provides post-installation support.
Find out what kind of warranties the installer offers for products and workmanship.

Once you’ve decided to go solar, compared solar panels, and determined how many panels you’ll need, you’ll have to find a reliable and qualified solar installer. There’s a lot of information to learn when buying solar panels, but if you know the right questions to ask solar companies and installers, you’ll have a much easier time with the process. In this guide, we’ll explain what to look for in a solar installer and what questions to ask when comparing them.

Choosing a solar installer based on experience and certification

The two most important factors to consider when selecting a solar installer are their certification and the breadth of their experience. You want an installer who holds certification from the North American Board of Certified Energy Practitioners (NABCEP), where possible, as this indicates that they possess the necessary knowledge and skills to safely and efficiently install a solar power system. That said, not all states require this certification.

Be sure to also prioritize installers that consistent track records of excellent service in your area. Customer reviews posted to solar sites and Google will help you find an installer that understands the unique characteristics of your climate and area.

In the table below, we’ve compiled some of the most important questions to ask any solar installer you’re considering hiring.

What to ask or look for	Why it matters	Red flags or tips
Are they licensed, bonded, and insured?	Ensures legal compliance and protects you from liability	Avoid installers without local credentials
How many installs have they completed?	Experience reduces risk of errors and delays	Very few installs may signal inexperience
Do they use in-house or subcontracted labor?	Affects quality and accountability	In-house crews usually provide more consistent results
What warranties do they offer?	Protects your system and workmanship	Watch for short labor warranties (1 year or less)
Can they provide local references?	Verifies reputation and past client satisfaction	Lack of references may signal a new or untrusted company
Who handles permits and inspections?	Saves time and hassle during the process	Full-service installers take care of this for you
Are they NABCEP certified?	Indicates technical proficiency in solar installation	Not required, but a good sign of expertise
What financing options do they offer?	Impacts your payment structure and ownership	Watch for high-interest leases or unclear loan terms
What brands and equipment do they use?	Determines system performance and warranty support	Avoid installers who only offer one panel brand
What’s their timeline from contract to activation?	Helps manage expectations and planning	Long delays (over 3 months) may signal inefficiency

Does the installer offer support?

To find out if an installer is right for you, compare them with other installers in your area. Some installers offer more services than others. The more hands-on your installer is with the process, the less you may have to worry about.

Here are some service and support offerings you may want to ask about:

Does the installer manage important processes like permitting, inspection, and grid connection?
Do they offer post-installation support? If so, is that support based locally?
Does the installer offer system monitoring tools?

Solar systems are complicated, and early support makes long-term maintenance much easier.

What brands and customization options do they offer?

Discuss with your potential installer the equipment options they offer and their level of customization available. You’ll want to see if they provide a range of panel brands and inverter types. We recommend avoiding companies that push proprietary products or have a limited selection.

Additionally, some installers prefer not to customize the array design. If you have an atypical roof shape, a lot of shading, or require your system to meet a specific energy load, you’ll need to know this information upfront.

What warranties and workmanship guarantees do you get?

If you’ve narrowed down your choice of installer after learning about their experience, service offerings, and equipment options, warranties and workmanship guarantees could seal the deal. Here are a few questions to ask an installer about backing up their work:

Do they offer a warranty on installation and labor? If so, how long does the warranty last?
Do they cover issues like roof penetrations and water leakage?
Do they cover future maintenance?

If the installer offers a warranty, make sure you’re clear on its exact terms to avoid any disputes should a covered issue arise.

Bottom line: Choosing the right solar installer

When selecting the right solar installer for your home system, you want someone who’s experienced in your area and climate. Look for installers with NABCEP certifications and customer reviews that mention reliable performance and good communication. The better installers will offer a variety of equipment choices and customization opportunities, as well as warranties on their products and workmanship.

If you talk to several installers and learn that it’s more trouble than the projected savings, that’s okay; going solar isn’t for everyone.

FAQ about choosing a solar installer

Below are a few frequently asked questions about choosing a solar installer:

How do I choose the right solar installer?

First, look for installers with extensive experience. They should be licensed and certified and have good ratings on solar review sites and the Better Business Bureau. You should be prepared to interview and compare several installers.

What is the 20% rule for solar panels?

Some homeowners choose to slightly oversize their system to account for future energy needs, but the exact size depends on your roof, budget, and utility policies.

What questions should I ask my solar installer?

You should ask how they guarantee their workmanship and how long their warranties last. You may also want to ask if and how they provide support and maintenance after the install is complete.

What should I consider before installing solar panels?

First, assess the condition of your roof, and then determine how much energy your home uses per month, how much sun your roof gets, and any potential shading issues from nearby trees. Next, you’ll need to research your utility’s solar policies, compare installation and maintenance costs with the projected savings, and compare solar installers in your area.