How Do I Vet a Solar Installer Before I Sign? The 2026 Verification Guide

Vetting a solar installer is mostly a matter of confirming a chain of accountability: which legal entity signs your contract, whose license the permit is pulled under, which crew is physically on your roof, and whose name is on the workmanship warranty when a penetration leaks in year seven. In a solid company those four answers point to one or two organizations you can look up in public records in an afternoon; in a sales-driven one they point to four different parties, and the person at your kitchen table works for none of them.

Solnology reads solar quotes for homeowners who want an outside opinion before they commit. We build nothing and service nothing, so there is no crew here waiting on work and no bid of our own competing with the one in front of you. What follows is how to check a company yourself, in the order that makes the checking fast, and what each answer is actually telling you.

Why does the installer matter more than the panels?

Because the hardware is close to a commodity and the labor is not. Modules from any established manufacturer will land within a few percentage points of each other over 25 years, while the quality of the mounting, the flashing, the conduit runs and the paperwork varies enormously from one crew to the next.

Think about what actually goes wrong on residential systems. It is rarely a panel. It is water finding its way in at a poorly flashed attachment, a conduit run that fails inspection twice, an interconnection application that was never filed, a monitoring system that was never commissioned, a permit that sat for four months while the homeowner made loan payments on a system that had not been switched on, and a service line that nobody picks up in year three. Every item on that list is a labor or administration problem, which means every item on that list is a function of the company rather than the equipment.

The warranty structure points the same way. Your modules and your inverter carry warranties from manufacturers you will never speak to, and those promises are only as durable as those manufacturers. The workmanship warranty, which covers the part of the system a human being built, is a promise from the company that sold to you, and that promise is only as durable as the company. Twenty-five year coverage from a firm that has existed for fourteen months is a different product from twenty-five year coverage from a firm that has been filing annual reports since 2011, even when the paperwork reads identically.

The 2026 backdrop sharpens this. The federal residential credit that used to return 30 percent of an owned system's cost ended for installations completed after December 31, 2025, so there is no longer a large federal refund cushioning a mediocre purchase. Payback on an owned system now tends to run somewhere in the range of 10 to 15 years, which is a long time to be tied to a company's service department. Meanwhile the industry has been through a period of consolidation and closures, with familiar names absorbed, restructured or wound down. "Will this company be reachable in a decade" is not a cynical question in this market. It is an ordinary one.

How do I verify that the installer is licensed, and what does the license actually cover?

Ask for the license number and the exact legal name it is held under, then enter both yourself on your state's contractor or electrical licensing board site and confirm the license is active, unexpired and free of open discipline. The number must belong to the entity that will sign your contract and pull your permit, not to a subcontractor or to an individual lending a credential.

Start by finding out what your state requires, because this is one of the places where a single state's rule gets repeated online as though it were national. Some states issue a dedicated solar or photovoltaic contractor license. Most route residential solar through an electrical contractor license. Several also want a roofing or general building credential for the structural attachment work, and a small number regulate at the county or municipal level rather than the state level, so the authoritative record sits with a local board. Your state licensing board's site and your local building department will both tell you which class of license a residential photovoltaic installation requires at your address. That is the answer to check the company against; a license in a different class is not the license the job needs.

Once you know the class, the record itself takes about five minutes to read. Look for:

• Status. Active, and not expired, suspended, inactive or in a probationary state.
• The exact name. The licensee name should match the company that will appear on your contract, character for character, allowing for a registered trade name that is itself documented.
• Original issue date. This tells you how long the credential has existed, which is a harder number than any claim in a brochure. A license issued a few months ago alongside marketing that describes a decade of experience is not proof of anything, but it is a question you are entitled to ask out loud.
• The qualifier. In many states the company's license runs through a named individual who holds the actual credential and is legally responsible for the work. Check whether that person is an officer or employee of the company. Credential-lending happens, and it tends to become visible when the same qualifier's name sits behind several unrelated contractors.
• Discipline, citations and complaints. Boards publish these unevenly, but where they exist they are the most useful few lines on the page.
• Bond and insurance flags. Some boards show whether a surety bond is on file and current.

Two habits make this check worth doing rather than merely appearing to do it. First, type the number into the lookup yourself rather than accepting a screenshot; digits get transposed, and numbers get copied forward from old proposal templates after a credential has lapsed. Second, ask separately who will pull the permit and under which license, then check that against the building department's own records. Permit records are public in most jurisdictions and name the contractor of record. If the contractor of record on the company's recent jobs is a different business from the one asking for your signature, you want that explained before you sign, not after a dispute makes it urgent.

None of this makes anyone at Solnology a licensing authority, and you should not take our word or anyone else's for a credential you can look up in two minutes. The point of the exercise is that the verification is yours to do and the record is free to read. A company that supplies the number readily and volunteers the qualifier's name has just made your afternoon easier. A company that gets evasive about a public record has answered a different question than the one you asked.

Has this company operated under a different name before?

Search your state's business entity registry for the exact name on the contract and note the registration date, the current status and the listed officers. Then search those officer names to see what other entities they have registered and whether any of those were dissolved.

Every state maintains a searchable registry of business entities, generally through the secretary of state or a division of corporations, and it is free. The registration date gives you a floor on the company's real age as a legal person. That floor will sometimes sit well below what the marketing says, and the gap is not automatically sinister: firms reorganize, buy each other, and spin up new limited liability companies for financing, insurance or multi-state reasons all the time. What the gap does is convert an unverifiable claim into a specific question. "Your ads say since 2012 and the entity was registered in 2024 — what was the predecessor, and did it carry its warranty obligations across?" is a fair question with a checkable answer.

The name match matters as much as the date. The proposal letterhead, the license record, the entity record and the signature block on the contract should all resolve to the same registered company, with any trade name backed by its own assumed-name or fictitious-name filing. Where they diverge, the contract governs, because the entity that signs is the entity you can hold to the deal. A warranty issued by a marketing brand that is not a registered entity anywhere is an aspiration.

The officer search is the step most homeowners skip and the one that most often changes the picture. Entity registries generally let you search by individual as well as by company. If the principals behind the business you are considering also sit behind an entity that was dissolved a year or two ago, that is worth understanding, because dissolution is the mechanism by which obligations get left behind. A company that stops existing stops owing. Look also at the status line: "administratively dissolved" usually means required annual filings lapsed, which is sometimes a clerical failure and sometimes the first visible sign that a business is winding down.

One structural note that this search often surfaces. A large share of residential solar is sold through dealer arrangements, in which the brand in the advertisement is a sales and finance organization while the installation is performed by an unrelated local contractor, and service after the fact routes to one, the other, or a third-party network. There is nothing wrong with that model as such, and some of the best crews in a given metro work inside it. What you need from the registry search is simply clarity about who is who, because the entity that signs your contract is the one whose promises are enforceable, and that entity may not be the one whose logo is on the folder.

How do I read a solar company's reviews without being misled by them?

Ignore the composite rating and read the complaints in date order. You are looking for whether the same failure repeats, whether it happens before or after the money moves, and whether the most recent reviews still describe it.

An average star rating blends three unrelated things: enthusiasm at the point of sale, reviews solicited on the day of installation when everything looks new, and the small minority of customers who come back years later to report what happened. Those three populations have almost nothing to do with each other, and the number that fuses them cannot separate a company that sells well from a company that installs well. Read the underlying text instead, with a few habits that make the text informative:

• Sort by recent. Platforms default to a relevance ordering that favors long, old, highly rated entries. Ownership, management and crews all turn over; a review from four years ago describes a company that may no longer exist in any operational sense.
• Separate the sale from the installation. A five-star review naming a sales representative and posted the same week the contract was signed is a review of a conversation. It tells you the pitch went well, which you already knew.
• Hunt for the second act. The reviews worth their weight are the ones written months or years later that mention a service call, a warranty claim, an inverter replacement, a leak, a true-up bill or a monitoring outage. Those describe the part of the relationship you are actually buying.
• Weigh patterns over outliers. Any company with volume collects an angry customer. Three unconnected people describing the same specific stall, such as a system sitting dark for months waiting on interconnection, or calls that stop being returned once final payment clears, describe a process, not a bad day.
• Read the responses. A company that answers criticism with specifics, and occasionally concedes a point, is showing you something real. A wall of identical templated replies is showing you a reputation-management subscription.
• Notice clustering. A dense burst of short, highly rated entries inside a narrow window, especially from accounts with no other activity, tells you about a review campaign rather than about workmanship.

Then go past the review platforms, because the informative material tends to sit elsewhere. Better Business Bureau files include the complaint narrative and the company's answer, and how a company handles a written complaint is a reasonable proxy for how it will handle yours. Your state attorney general or consumer protection office typically accepts and sometimes publishes complaints against contractors. Where county civil dockets are searchable online, running the entity name through them takes a minute and surfaces contract disputes and lien actions that no marketing page will mention. A plain search of the exact entity name alongside words like complaint, lawsuit or lien gets past the branded results that dominate the first page for a company name on its own.

Finally, ask for the one thing the internet cannot give you: the phone number of a customer whose system was installed at least two years ago, ideally in your county. Then ask that homeowner a single narrow question. Not whether they are happy, which tends to produce politeness, but what happened the first time they needed something after the install, and how long it took. The answer to that question is the product you are buying.

Who will actually be on my roof, and who is accountable if something leaks?

Ask which company employs the crew, whether that company is the one signing your contract, and under whose license the work will be performed. Subcontracting is ordinary and not a defect; a chain in which nobody will name the next link is.

Residential solar work arrives in roughly three shapes. There is the vertically integrated contractor that sells, designs, installs and services with its own people. There is the contractor that does most of the work in-house but subcontracts a specific trade, typically electrical or roofing, to a specialist. And there is the dealer arrangement described earlier, where the selling organization, the installing contractor, the finance company and whoever handles service can all be four different businesses. Each shape can produce excellent work. What differs is the number of seams, and seams are where a service request goes to die two years later when everyone involved believes the request belongs to someone else.

So map the seams before you sign, with questions that have factual answers:

• Which legal entity employs the crew that will be at my house? A name, not a reassurance.
• Are they employees or a labor subcontractor, and if subcontracted, does that firm hold its own license and carry its own insurance?
• Who is the on-site lead, and will anyone from the contracting company inspect the finished work before it is called complete?
• Who performs the roof penetrations and flashing, and what is the flashing method for my roof type? Tile, metal, low-slope membrane and asphalt shingle each want a different detail, and a company that can describe the detail for your roof has thought about your roof.
• Who takes the service call in year five, and is that obligation written into the contract or offered as a courtesy?

The roof deserves particular attention because it is where the two most expensive failure modes live. If your roof is within a few years of replacement, ask what removal and reinstallation of the array will cost later and get that figure in the contract rather than discovering it when the roofer arrives. If your roof is under an existing warranty, ask whether the penetration method preserves it and who has confirmed that, since some roofing warranties are voided by unapproved penetrations. And ask, plainly, who owns a leak if the roofer and the solar contractor disagree about its cause. A company that has a clean answer to that has had the argument before and has decided how it handles it.

Who backs the workmanship warranty if the company is gone?

Ask whether the workmanship warranty is the company's own promise or an insured product administered by an outside party, and then ask for the document itself. A self-backed warranty ends when the company does, which makes the wording of that one page worth more than most of the proposal.

A residential system carries several separate promises, and they come from different places. The modules and the inverter are covered by their manufacturers, on terms published by those manufacturers. The installation work is covered by the contractor. Sometimes there is a distinct roof-penetration or weatherproofing term, and sometimes there is a production or performance guarantee sitting on top of everything. Homeowners tend to hear "25-year warranty" and picture one shield. It is several shields of different sizes held by different people.

The manufacturer promises generally outlive the contractor, with one practical catch worth understanding. A manufacturer warranty typically supplies the replacement component. Someone still has to diagnose the fault, get on the roof, remove the failed part and commission the new one, and that labor is the contractor's side of the deal. When the contractor is gone, you are hiring a second company to perform warranty labor for a part you are receiving for free, and companies that did not do the original installation often charge more to touch someone else's array. That is the specific exposure the workmanship warranty is protecting you from.

Read the workmanship terms for these points, which vary far more than the marketing suggests:

• Duration and scope. Ten years and twenty-five years are both common, and the covered list should name attachments, flashing, racking, conduit, terminations and the roof surface within the array footprint.
• Labor and truck roll. Whether the service visit and the labor are included, or only the repair itself, is the difference between a warranty and a coupon.
• Removal and reinstallation. Whether the array coming off for a roof repair is covered, and at what cost if it is not.
• Exclusions and voiding conditions. Especially anything that voids coverage if another contractor works on the roof, which can trap you the day you need a roof repair.
• Transferability. Whether the warranty follows the house to a buyer, whether there is a transfer fee, and whether there is a deadline for registering the transfer. This one shows up at closing when nobody has time to fix it.

Where a company advertises third-party backing, the useful move is to ask for the certificate and read it, since the phrase covers several quite different products. You want the name of the insurer or administrator, the policy or program identifier, the term, what event triggers coverage, and whether the coverage attaches to your project or to the company generally. Some programs step in only on insolvency; others administer routine claims from day one; some are written per installation and others are a blanket policy that can lapse if the contractor stops paying for it. A claim of backing with no document attached is a claim, not a backstop.

Two adjacent items belong in the same conversation. A production or performance guarantee is only meaningful if you can see how the baseline was set, how a shortfall is measured, what excuses it, how a payment is calculated and who administers it if the company exits; a guarantee against an estimate the company itself produced and can revise is a sentence rather than a protection. And monitoring is worth a question of its own, because the portal is often the company's own platform rather than the inverter manufacturer's. If the monitoring runs through the manufacturer, you can usually get re-credentialed after a contractor disappears. If it runs through a contractor's proprietary portal, you may simply lose visibility into your own production.

One thing does not change when a contractor folds: the financing. A solar loan is an obligation to a lender, entirely separate from whether the installer still answers the phone, and these loans carry structures of their own that are worth reading before signing, including the two-payment design covered in our explanation of why a solar loan payment jumps after 18 months. The company's survival affects your service; it does not affect your payment.

What insurance and lien exposure should I confirm before work starts?

Ask for a current certificate of insurance showing both general liability and workers' compensation, sent by the insurance agent rather than forwarded as an image by the salesperson. Then ask how the company handles lien waivers from its subcontractors and suppliers.

Insurance is easy to overlook, because it feels like administrative paperwork next to the exciting numbers on the proposal, and because it only matters on the day something goes wrong. General liability responds when the work damages your home, which on a solar job usually means water, fire or a compromised structural member. Workers' compensation responds when someone is hurt on your property, and the exposure to you if it is absent depends on state law but is real enough that it is not worth testing. Producing a current certificate is routine for any contractor with a functioning back office; how the request is received tells you something about the back office.

When the certificate arrives, check that the named insured matches the entity on your contract rather than an affiliate, that the policy dates are current through your expected installation window, and that the limits are plausible against the value of the home rather than the value of the job. Where the company is willing, ask to be listed as a certificate holder, which is the mechanism by which you would be notified if the policy were cancelled mid-project.

Lien exposure is the risk homeowners are least likely to have been told about. In most states, a subcontractor or a materials supplier who is not paid by the contractor can record a mechanics lien against your property even if you paid the contractor in full and on time. The homeowner is then holding a clouded title over a debt they already settled. The mechanics differ considerably by state, including who must send a preliminary notice and when, what the filing deadlines are, which waiver forms are recognized, and what protections exist for owner-occupied homes, so treat the specifics as a local question rather than a general rule. What travels well is the protective habit: ask whether the company will provide lien waivers from subcontractors and suppliers with each payment, and understand the difference between a conditional waiver, which takes effect when the payment clears, and an unconditional one, which does not depend on it. If a preliminary notice arrives in your mail during the project, it is not junk; it means a party on your job has preserved its right to file.

The payment schedule is protection of the same kind. Payments tied to milestones you can verify, such as permit issued, installation complete, inspection passed and utility permission to operate granted, keep some leverage on your side of the table through the slowest phase of the project, which is usually the one after the panels are already on the roof. A large percentage demanded up front moves the risk onto you; several states cap deposits on home improvement contracts for exactly that reason, so it is worth knowing your state's limit before you agree to a number. And if the license record showed a surety bond, note it. A bond is usually small relative to the price of a solar contract, but the claim process is a real avenue when a contractor leaves work unfinished.

Which questions separate a real operator from a sales shop?

The most useful questions are the ones a competent company answers immediately and a sales organization has to escalate. Ask for specifics that live in an engineering, permitting or operations department, then notice who has to phone a manager.

What follows is not a script to recite. It is a set of questions chosen because the answers are checkable and because a company that cannot produce them has told you where its capability actually sits.

• "Who designs the system, and will I see the plan set?" A contractor with engineering capacity will name the design team or the engineering partner and will share the site plan, the electrical one-line diagram and the attachment detail. A sales organization will say that engineering handles it after signing. The plan set is also how you check that what was sold matches what will be built.
• "Will the site survey happen before the contract is binding?" Most proposals are built from aerial imagery and a utility bill, which means nobody has yet looked inside your electrical panel or under your roof. A company willing to survey first, or to hold its price firm subject to a short written list of contingencies, is carrying that risk instead of passing it to you as a change order later. Electrical adders are the classic post-signing surprise, and the one most often disputed is covered in our piece on whether you really need a main panel upgrade.
• "What is the cash price, and what is the financed price for an identical system?" Both figures, in writing. The gap between them is the dealer fee embedded in the financing, and a company comfortable stating both is showing you its pricing rather than steering you toward a monthly number.
• "Who files the interconnection application, and what are your recent turnaround times with my utility?" A real operator names your utility's program, gives a recent range rather than a slogan, and explains what happens if it slips. Interconnection and permitting are where months disappear, and the company that has done many of them locally can describe the process without improvising.
• "Which modeling tool produced this production estimate, and what shading, soiling and degradation losses were assumed?" Design teams answer this in one sentence. It matters because when two proposals for the same roof differ substantially in projected output, the cause is almost always the assumptions rather than the equipment, and an optimistic loss assumption is the cheapest way to make a savings figure look better.
• "What happens to my price if the survey finds something?" You want the change-order clause in the contract: written approval from you before additional cost is incurred, and the right to cancel without penalty if you decline.
• "May I have contact details for a customer you installed at least two years ago near me?" Recent references are easy. Older ones speak to service.
• "What is the cancellation window in this agreement, and how do I exercise it?" Every company should be able to point at the clause. Rescission rights vary by state and can differ depending on whether the sale happened at your home, so read the clause rather than trusting a summary of it.
• "Who is my point of contact after installation, and what number do I call for service?" A named role and a direct line beats a general inbox.

Alongside the answers, watch the behavior around them, because the pattern is consistent across trades. Pricing that expires at the end of the visit exists to prevent comparison. Reluctance to leave a copy of the proposal behind has the same purpose. An electronic signature pushed at the table before you have read anything is a process designed around your fatigue. A representative who is vague about permitting and licensing but extremely confident about a 25-year savings total has demonstrated which department they work for. And the inverse is a useful signal in the other direction: a company that is relaxed about you taking a week to verify things is a company that expects to win on the strength of what it does.

What does a company worth hiring look like once you add it all up?

It is a company whose license record, entity record, permit history and contract all resolve to the same name, and whose answers to uncomfortable questions arrive with specifics attached. Almost nothing about it requires you to trust a claim you cannot independently check.

In practice, the picture is fairly consistent. The license is in the right class for your state and has been held for years rather than months. The entity is registered, current on its filings, and has the same officers it had several years ago. The permit history shows the same contractor name appearing at addresses in your area. The people who answer questions know which utility you are on, which inspector is difficult, and how long the interconnection queue has been running. The proposal separates its line items instead of hiding them inside a price per watt. The contract names the crew's employer and the entity behind the warranty. And nobody involved is in a hurry.

The checking that produces that picture fits in one afternoon:

• License number entered by you in the state's lookup: class, status, issue date, qualifier, discipline history.
• Entity registry: registration date, status, officer names, exact name match to the contract; officer names then searched for prior dissolved entities.
• Building department permit records, where searchable, for the contractor of record on recent local jobs.
• Reviews read newest first with the negative ones first, plus Better Business Bureau narratives and a plain search of the entity name alongside complaint, lawsuit and lien.
• A certificate of insurance received from the agent, covering both general liability and workers' compensation.
• The workmanship warranty document read end to end, and the third-party backing certificate if backing is claimed.
• Two answers in writing: which entity employs the installing crew, and what happens to the price if the survey finds something.
• One phone call to a customer from two or more years ago.

Weight the findings rather than treating them as a scorecard. A license that is expired, in the wrong class, or held by a company other than the one signing is disqualifying on its own, as is a refusal to supply the number or the insurance certificate, or any pressure to sign before verification is finished. Other findings are questions rather than verdicts: a young entity may be experienced people who left a larger firm; subcontracted labor may be the best roofing crew in the county; a self-backed workmanship warranty is extremely common and simply needs to be priced into your judgment of the company's staying power. The pattern across findings matters more than any single line, and the most telling variable is usually how the company reacts to being asked.

If you have already signed and this article has raised something, check your cancellation window first, because it is short and it is the only leverage that expires. After that, the next natural checkpoint is any change order, since a proposed increase reopens the terms and is a reasonable moment to ask for the answers that were skipped the first time.

If a proposal is already sitting on your kitchen table and you want somebody outside the deal to look at the company behind it, that is the work Solnology does. Start with the free quote review. Have the proposal, the equipment list and any warranty or financing paperwork ready, and we will ask for the pieces we need when we follow up. Prefer to begin with a conversation? Book a 10-minute call and we will walk through the company and its numbers together. Solnology does not install solar systems, does not design them and does not service them; our whole job is reading what somebody else has put in front of you.

This is general education about researching a contractor, not legal, financial, tax or insurance advice. Licensing classes, lien procedures, deposit limits and cancellation rights are set state by state and amended from time to time; check what applies where you live with your state licensing board, your local building department, and a qualified professional when the sum at stake justifies one.