TL;DR: Before hiring a solar panel contractor, ask about their licensing, experience, warranty terms, equipment brands, financing options, installation timeline, and what happens after installation. These seven questions help homeowners avoid costly mistakes and find a contractor who delivers real, long-term value.
Going solar is one of the biggest home improvement decisions you’ll make. The potential savings are real, the environmental benefits are clear, and the long-term value is well-documented. But the quality of your solar installation depends almost entirely on who does the work—and not every contractor is created equal.
The solar industry has grown rapidly over the past decade, which means more options for homeowners, but also more room for subpar work and misleading sales tactics. A low quote might seem appealing until panels underperform, warranties fall through, or hidden costs surface months later.
The good news? A handful of pointed questions can reveal everything you need to know about a contractor’s professionalism, reliability, and fit for your project. Ask these seven before signing anything, and you’ll be in a far stronger position to make the right call.
1. Are You Licensed, Insured, and Certified to Install Solar in My State?
This is the non-negotiable first question. Licensing requirements for solar contractors vary by state, but any reputable installer should hold the appropriate electrical contractor’s license for your area. Without it, you could face legal liability if something goes wrong—and your homeowner’s insurance may not cover damage caused by unlicensed work.
Beyond basic licensing, look for contractors certified by the North American Board of Certified Energy Practitioners (NABCEP). NABCEP certification is widely regarded as the gold standard in the solar industry, requiring installers to demonstrate technical knowledge, field experience, and a commitment to ongoing education.
Ask to see proof of general liability insurance and workers’ compensation coverage as well. If a crew member is injured on your property and the contractor lacks proper coverage, you could be held responsible.
Key follow-up: Ask if the installer will pull the necessary permits. A trustworthy contractor handles permitting on your behalf—if they suggest skipping it, walk away.
2. How Much Experience Do You Have With Residential Solar Projects?
General construction experience doesn’t automatically translate to quality solar installation. Ask specifically how many residential solar projects the contractor has completed, and how long they’ve been in the solar business.
Ideally, you want a contractor with at least three to five years of dedicated solar experience and a portfolio of completed residential projects they can point to. Ask if they can provide references from previous customers—and actually call them. Ask those homeowners whether the project was completed on time, whether the system has performed as expected, and how the solar panel contractor handled any issues that came up post-installation.
Online reviews on platforms like Google, Yelp, and the Better Business Bureau are also worth checking. A contractor with hundreds of positive reviews and a track record of resolving complaints professionally is a very different proposition from one with a handful of mixed ratings.
3. What Solar Equipment and Brands Do You Use?
Not all solar panels and inverters are built the same. The brand and quality of equipment your contractor installs will directly affect your system’s performance and longevity—sometimes for 25 years or more.
Ask which panel manufacturer they use and why. Well-regarded panel brands include LG, SunPower, REC, and Panasonic, among others. Tier 1 panels from established manufacturers generally offer better efficiency, durability, and warranty coverage than cheaper alternatives.
Equally important is the inverter—the device that converts the DC power your panels generate into usable AC electricity. String inverters, microinverters, and power optimizers each have different advantages depending on your roof layout and shading. A knowledgeable contractor should be able to explain which inverter type they recommend for your specific setup and why.
Key follow-up: Ask whether the equipment they use is eligible for the federal solar Investment Tax Credit (ITC) and any relevant state or utility incentives.
4. What Warranties Come With the Installation and Equipment?
Solar installations come with multiple layers of warranty coverage, and understanding each one is critical before you commit.
There are typically three types:
- Equipment warranty: Covers defects in the panels and inverter. Most quality panels carry a 10- to 25-year product warranty.
- Performance warranty: Guarantees that panels will produce a specified percentage of their rated output over time—commonly 80–90% after 25 years.
- Workmanship warranty: Covers the quality of the installation itself, including wiring, mounting, and roof penetrations. This is the contractor’s own warranty, and it varies widely—anywhere from 1 to 10 years depending on the company.
A contractor who can’t clearly explain what each warranty covers—or who offers unusually short workmanship coverage—is a red flag. Also ask what happens to your warranty if the contractor goes out of business. Some manufacturers offer warranties that transfer directly to the homeowner, which provides an important safety net.
5. What Is the Expected Timeline From Contract to Completion?
A solar installation rarely happens overnight. Between signing the contract, designing the system, pulling permits, and scheduling the physical install, the process typically takes anywhere from one to three months.
Ask your contractor to walk you through each step and provide a realistic timeline. Understanding where potential delays can occur—utility interconnection approvals are a common bottleneck—helps set appropriate expectations.
Be cautious of any contractor who promises an unusually fast timeline without a clear explanation of how they’ll achieve it. Rushing through permitting or skipping proper system design can lead to costly problems down the line.
Key follow-up: Ask who will be your main point of contact throughout the project and how often you can expect updates on progress.
6. How Do You Handle Financing, and What Are All the Costs Involved?
Solar installations can be financed in several ways: cash purchase, solar loan, lease, or power purchase agreement (PPA). Each option has different implications for ownership, tax credits, and long-term savings.
A cash purchase typically offers the best long-term return and allows you to claim the full federal ITC. Solar loans let you own the system while spreading the cost over time. Leases and PPAs, on the other hand, mean the contractor or a third party owns the panels—which can complicate home sales and limits your access to tax incentives.
Ask for a complete, itemized breakdown of all costs upfront. A reputable contractor will be transparent about what’s included in the quoted price—equipment, labor, permits, utility interconnection fees—and what isn’t. Hidden costs are one of the most common complaints in the solar industry, so push for specifics.
Also ask whether your project qualifies for any state rebates, local utility incentives, or net metering programs that could further reduce your out-of-pocket cost.
7. What Ongoing Support and Monitoring Do You Provide After Installation?
Your relationship with a solar contractor shouldn’t end the moment the crew leaves your driveway. Ask what post-installation services they offer and how they handle service calls or system issues.
Most modern solar systems come with monitoring software that tracks daily energy production in real time. Ask whether the contractor provides access to this monitoring platform, how to interpret the data, and what to do if your system underperforms.
Find out their process for handling warranty claims or repairs. How quickly do they typically respond? Do they have an in-house service team, or do they outsource repairs to third parties? A contractor with a dedicated service department is generally more reliable than one who passes all post-installation issues to manufacturers or subcontractors.
Key follow-up: Ask if they’ll notify you proactively if monitoring data suggests a performance issue, or whether it’s your responsibility to flag problems.
Making the Final Decision: What to Look for in a Solar Contractor
Once you’ve asked these questions, compare the answers across multiple contractors—ideally at least three. Pay attention not just to the content of the answers, but to how they’re delivered. A contractor who is transparent, patient, and willing to explain their reasoning in plain language is likely to provide a better overall experience than one who rushes through your questions or offers vague assurances.
Price matters, but it shouldn’t be the only factor. A system installed by an experienced, well-reviewed contractor using quality equipment is almost always worth paying a modest premium for—particularly when you consider that solar panels are designed to last two decades or more.
The right contractor will welcome every question on this list. That confidence, backed by clear answers, is itself a strong signal that you’re dealing with someone worth trusting.
Frequently Asked Questions
What qualifications should a solar panel contractor have?
A qualified solar panel contractor should hold a valid electrical contractor’s license for your state, carry general liability and workers’ compensation insurance, and ideally hold NABCEP certification. Always ask to see proof of these credentials before signing a contract.
How many quotes should I get before choosing a solar contractor?
Getting at least three quotes from different solar contractors is a widely recommended practice. This gives you a realistic sense of fair market pricing for your project and allows you to compare equipment, warranty terms, and service approaches side by side.
How long does a residential solar installation typically take?
Most residential solar installations take between one and three months from contract signing to system activation. The physical installation itself may only take one to three days, but permitting, utility interconnection approvals, and system design can add significant time to the overall process.
Can I claim the federal solar tax credit regardless of how I finance my system?
No. The federal solar Investment Tax Credit (ITC) is only available to homeowners who purchase their system outright—either with cash or a solar loan. If you sign a lease or power purchase agreement (PPA), the third-party owner of the system typically claims the tax credit instead.
What happens if my solar contractor goes out of business after installation?
This depends largely on the warranties attached to your system. Equipment warranties from major manufacturers are typically tied to the manufacturer, not the installer, so they may remain intact. Workmanship warranties, however, are generally voided if the contractor closes. Ask prospective contractors whether they carry any form of warranty protection that covers this scenario.
What is net metering and should I ask my contractor about it?
Net metering is a billing arrangement that allows solar homeowners to send excess energy back to the grid in exchange for credits on their utility bill. Availability and terms vary by state and utility provider. A knowledgeable contractor should be able to confirm whether net metering is available in your area and how it will affect your projected savings.
