The residential solar industry is currently experiencing a massive boom. As energy prices fluctuate and homeowners look for ways to gain energy independence, putting a power plant on your roof has never been more appealing. However, this rapid industry growth has a side effect: a marketplace flooded with new companies, aggressive sales tactics, and varying levels of expertise.
Choosing to go solar is a significant financial commitment, often rivaling the cost of a new car or a major home renovation. The hardware you install needs to function efficiently for 25 years or more. Consequently, the company you choose to install that hardware is just as important as the panels themselves. A poor installation can lead to roof leaks, electrical hazards, and a system that never produces the energy promised.
Vetting your installer is the single most effective way to protect your investment. You need to look past the glossy brochures and sales pitches to understand exactly who you are hiring. By asking the right questions, you can separate the reputable pros from the “fly-by-night” operations.
Here are the 12 essential questions you must ask every solar contractor before signing a contract.
1. Are you licensed specifically to install solar in my state?
This might seem basic, but it is the first line of defense against scams. Licensing requirements vary significantly by state and even by municipality. Some areas allow general contractors to install solar, while others require a specific solar panel contractor’s license or a specialized electrical license.
Ask to see their license number and verify it with your state’s contractor licensing board. A valid license proves they have met the minimum competency requirements and carry the necessary bonding to protect you if they fail to complete the job.
What to listen for:
A reputable contractor will happily provide their license number and explain the specific credentials required in your jurisdiction. Be wary of anyone who dances around the topic or claims they operate under a “partner’s” license without explaining the relationship clearly.
2. What insurance coverage do you carry?
Construction on your roof involves risk. There is the risk of damage to your home and the risk of injury to the workers. You need to ensure the contractor carries both general liability insurance and workers’ compensation insurance.
General liability protects your property. If a ladder falls through your window or a worker accidentally damages your roof structure, this insurance covers the repairs. Workers’ compensation is equally critical; if a worker falls off your roof and the company doesn’t have this coverage, you could potentially be held liable for their medical bills.
What to listen for:
Ask for a proof of insurance certificate. Do not just take their word for it. A professional outfit will have these documents ready to email to you immediately.
3. How many years have you been in business?
The solar “coaster” is a real phenomenon. Companies spring up when incentives are high and vanish when the market tightens. You want a company that has weathered a few storms and has a track record of stability.
While a new company isn’t automatically bad, a company with five to ten years of experience has likely worked out its logistical kinks. They have established relationships with suppliers and know how to navigate the local permitting bureaucracy.
What to listen for:
Ideally, you want a company that has been operating longer than the length of their workmanship warranty. If they offer a 10-year warranty but have only been in business for six months, that warranty is a gamble.
4. Do you use in-house installers or subcontractors?
This is a pivotal question that often gets overlooked. Some solar companies are essentially sales organizations that farm out the actual labor to third-party subcontractors. While subcontracting is common in construction, it introduces a layer of separation between you and the person drilling holes in your roof.
If they use subcontractors, ask who they are and if they are local. You need to know who is accountable if something goes wrong. If the system fails in three years, the sales company might blame the subcontractor, and the subcontractor might blame the sales company, leaving you stuck in the middle.
What to listen for:
“In-house crews” is generally the preferred answer. It means the installers are employees of the company, trained by them, and driving their trucks. It usually implies higher quality control and accountability.
5. Can you provide three recent references in my area?
Online reviews are helpful, but they can be faked or incentivized. Speaking directly to a past customer provides unfiltered insight. Ask for references from customers who had their systems installed at least a year ago. You want to know not just how the installation went, but how the system is performing now and if the company was responsive to any post-installation questions.
What to listen for:
When you call the references, ask specific questions: Did the crew show up on time? Did they leave a mess? Has the system produced the energy they promised? Did the final bill match the quote?
6. Who manufactures the panels and inverters you use?
Not all solar equipment is created equal. There are “Tier 1” manufacturers known for reliability and financial stability, and then there are generic brands that may lack long-term support. You should also ask about the inverter system. Will you have a string inverter, microinverters, or power optimizers?
Microinverters (like those from Enphase) or power optimizers (like SolarEdge) generally offer better performance for roofs with shade, as they allow each panel to operate independently. String inverters are cheaper but can be less efficient if one panel is obstructed.
What to listen for:
You want to hear recognizable brand names like Q Cells, REC, Panasonic, SunPower, Enphase, or SolarEdge. If they suggest a brand you’ve never heard of, ask why they chose it. Is it because it’s the best technology, or because it’s the cheapest for them to buy?
7. Can you explain the warranties in detail?
Solar warranties are often marketed as “25 years,” but this is a simplification. There are usually three distinct warranties you need to understand:
- Product Warranty: Covers defects in the equipment itself (e.g., the panel glass breaks or the frame bends).
- Performance Warranty: Guarantees that the panels will produce a certain percentage of their original power output after 25 years (usually around 85-92%).
- Workmanship Warranty: Covers the labor and installation. If a wire comes loose or the roof leaks because of a drilling error, this is what covers you.
What to listen for:
Pay close attention to the workmanship warranty. This is the one backed by the installer, not the manufacturer. A 10-year workmanship warranty is the industry standard, but some premium installers offer 25 years.
8. Will you perform a roof inspection before the install?
Installing solar panels on an old or damaged roof is a recipe for disaster. The panels will last 25 to 30 years; your roof needs to last just as long. If your roof has only five years of life left, you will have to pay to remove the panels, replace the roof, and reinstall the panels later—a costly process.
A responsible contractor will inspect your roof’s condition and structural integrity before agreeing to the job. If they try to sell you panels without looking at your roof first, run.
What to listen for:
They should mention checking the age of the shingles, the layers of roofing, and the condition of the rafters or trusses. If your roof needs work, they should be honest about it upfront.
9. Who handles the permitting and HOA approvals?
Solar installations involve a surprising amount of paperwork. You need electrical permits, building permits, and an interconnection agreement with your utility company. If you live in a community with a Homeowners Association (HOA), you likely need their architectural approval as well.
This paperwork can be tedious and confusing. You are hiring a contractor to make this a turnkey experience. They should handle the bureaucracy for you.
What to listen for:
The contractor should confirm that they prepare and submit all permit applications and interconnection documents. They should also be willing to communicate with your HOA to ensure the design meets community guidelines.
10. What is the total cost, and is there a price escalator?
If you are leasing the system or signing a Power Purchase Agreement (PPA), you need to be very careful about “price escalators.” This is a clause that increases your monthly payment by a certain percentage every year (often 2.9%). Over 20 years, this can double your payment and wipe out your savings.
If you are buying the system (cash or loan), ask for the “turnkey price.” This should include everything: equipment, labor, permitting, taxes, and potential hidden costs like trenching or main panel upgrades.
What to listen for:
Transparency is key. If the financing structure is so complex that they can’t explain it in plain English, it’s likely not in your favor. Be wary of anyone selling “free solar.” Nothing is free; you are usually just trading your utility bill for a lease payment.
11. How does the tax credit work, and do you handle the paperwork?
The Federal Investment Tax Credit (ITC) allows you to deduct 30% of the cost of installing a solar energy system from your federal taxes (as of 2024). However, this is a tax credit, not a rebate. You must have tax liability to use it.
Contractors often calculate your “net cost” assuming you get this credit. You need to verify that you are actually eligible for it. While contractors cannot give tax advice, they should be able to explain how the credit is generally applied and provide the necessary receipts for your accountant.
What to listen for:
Honesty about eligibility. If a sales rep guarantees you will get the full refund check without knowing your tax situation, they are being dishonest.
12. What happens if my system stops working?
Solar systems are low maintenance, but they are not no-maintenance. Inverters can fail. Monitoring systems can go offline. You need to know who to call when the lights on the inverter turn red.
Does the contractor offer active monitoring (where they get an alert if your system goes down), or is it reactive (you have to notice the bill spike and call them)?
What to listen for:
A clear service plan. You want a dedicated service department phone number or email, not just the cell phone number of the sales guy who might not work there next year.
Common Red Flags to Watch Out For
While asking these questions, keep your radar up for these warning signs. If you encounter any of these, consider looking for a different contractor.
- High-pressure tactics: “This price is only good for today” is a classic manipulation tactic. A reputable installer will stand by their quote for 14 to 30 days.
- Door-to-door aggressive sales: While legitimate companies do use door knockers, be cautious of anyone who demands to see your utility bill immediately or refuses to leave literature for you to review later.
- Guaranteed elimination of utility bills: No one can guarantee a $0 electric bill. Most utilities have fixed connection charges that you will pay even if you generate 100% of your power.
- No site visit: Technology is great, but satellite imagery can’t see dry rot in your rafters. A physical site audit is essential before final engineering.
Frequently Asked Questions
Does solar increase my property taxes?
In many states, there are property tax exemptions for renewable energy systems. This means that while the value of your home may go up because of the solar panels, your property tax bill will not increase based on that added value. However, this varies by location, so check with your local tax assessor.
What happens if I sell my house?
If you own the system (cash or loan), the value of the system usually transfers to the new owner, often increasing the home’s resale value. If you have a lease or PPA, it can be more complicated. You usually have to transfer the lease to the new buyer (who must qualify for it) or buy out the remainder of the contract. This is why many real estate agents prefer owned systems over leased ones.
Will solar panels work during a power outage?
Standard grid-tied solar systems will not work during a blackout. This is a safety feature to prevent your panels from sending electricity back into the grid and injuring utility workers fixing the lines. If you want power during an outage, you must install a battery backup system.
How long does the installation take?
The actual physical installation usually takes 1 to 3 days. However, the timeline from signing the contract to turning on the switch can take anywhere from 2 to 6 months. This delay is due to permitting, HOA approval, and utility interconnection, which are largely out of the contractor’s control.
Empower Yourself Before You Power Your Home
The transition to solar energy is an exciting step toward sustainability and financial savings. It is a tangible way to reduce your carbon footprint while insulating yourself from rising utility rates. But the hardware on your roof is only as good as the team that puts it there.
By asking these 12 questions, you shift the dynamic from a sales pitch to an interview. You demonstrate that you are an informed consumer who expects quality, transparency, and accountability. Do not rush the process. Get multiple quotes—at least three is the standard recommendation—and compare the answers you receive.
The right contractor will appreciate your thoroughness because it allows them to demonstrate their expertise. They won’t just want to sell you a system; they will want to partner with you on a 25-year energy solution. Take your time, ask the hard questions, and enjoy the sunshine.
