How to Choose a Solar Installer in 2026

Choosing the right solar installer is the single most important decision in your solar journey — more important than the panels themselves. A great installer designs your system correctly, installs it cleanly, handles all permitting, and stands behind their work for decades. A bad one can leave you with a leaking roof, an underperforming system, voided warranties, or thousands of dollars in unexpected costs.

With the Section 25D residential tax credit expired as of December 31, 2025, homeowners are paying more out of pocket in 2026, making it even more critical to get the best value and avoid costly mistakes. This guide walks you through every step of finding, vetting, and hiring a solar installer you can trust.

This article contains affiliate links. We may earn a commission at no extra cost to you if you purchase through these links.

If you're still deciding whether solar makes financial sense, start with our breakdown of the real cost of installing solar panels at home. Already know you want solar? Read on.

Why Your Installer Matters More Than Your Panels

You can buy the best panels on the market, but if they're installed incorrectly, you will not get the performance you paid for. Poor installation leads to roof leaks, electrical hazards, underproduction, and warranty disputes. The installer also determines:

System design — whether your system is sized correctly for your energy usage and roof layout
Equipment selection — which panels, inverters, and racking hardware go on your roof
Permitting and interconnection — whether all paperwork is filed correctly and on time
Warranty support — whether someone will actually show up if something goes wrong in year 8

The bottom line: spend more time researching your installer than researching panel brands. A competent installer will recommend the right equipment for your situation. For panel-specific guidance, see our complete buyer's guide to choosing the best solar panels.

How to Vet a Solar Installer

Before you sign anything, verify these five credentials. Think of this as your minimum screening checklist.

1. State Licensing

There is no single national license for solar installers. Every state sets its own requirements, and they vary significantly:

California requires a C-46 Solar Contractor license or C-10 Electrical Contractor license
Florida requires a certified solar contractor license
Connecticut requires NABCEP certification for at least one employee plus a PV-1 or E-1 license
New York requires NABCEP certification or IBEW-NECA training
Hawaii grants solar installation rights to licensed general contractors automatically

Always verify an installer's license is active through your state's contractor licensing board. In California, that's the Contractors State License Board (CSLB). You can also check the IREC database for current state-by-state requirements.

2. Insurance

Any installer working on your roof should carry both general liability insurance and workers' compensation. Ask for a Certificate of Insurance (COI) naming you as additionally insured during the project.

Minimum recommended coverage:

Insurance Type	Minimum Amount
General liability	$1,000,000
Workers' compensation	$1,000,000

This is not optional. If an uninsured worker is injured on your roof, you could be held liable.

3. NABCEP Certification

NABCEP (North American Board of Certified Energy Practitioners) certification is the gold standard in the solar industry. The NABCEP PV Installation Professional certification requires qualifying education, documented work experience, passing a rigorous proctored exam, signing a code of ethics, and continuing education every three years.

NABCEP certification is not legally required in every state, but it is a strong signal that a company invests in quality. In some states, it is directly tied to financial benefits:

Maine, Minnesota, and Wisconsin — NABCEP certification required for state rebate eligibility
Utah and Rhode Island — NABCEP certification is a prerequisite for a state solar contractor license
Delaware — NABCEP preferred for rebate eligibility

Use the NABCEP Professional Directory to verify an installer's certifications.

4. Reviews and Reputation

Check multiple sources: Google Reviews, BBB, affiliate:SolarReviews, affiliate:EnergySage, and Yelp. Focus on reviews from the most recent 12 to 18 months — a company's quality can change over time.

Look for patterns in negative reviews. Occasional complaints happen to every business, but repeated issues with communication, timeline delays, or post-installation support are red flags.

Also verify:

Time in business — at least three years is a good minimum
Local physical presence — an actual office, not just a P.O. box
References — request three to five from recent customers in your area and ask specifically about work quality, communication, timeline accuracy, and whether they would hire the company again

5. In-House vs. Subcontracted Crews

Ask directly whether the company uses in-house installation crews or subcontractors. In-house crews offer more consistent quality control and clearer accountability. Many national companies subcontract to local firms, which can lead to varying experience levels and quality inconsistency.

If they subcontract, ask who the subcontractor is and check their reviews separately.

Red Flags That Should Send You Running

The solar industry has its share of bad actors. Here are the warning signs that should make you walk away immediately.

High-Pressure Sales Tactics

"Sign today or lose this price" — legitimate companies give you time to research
Door-to-door salespeople pushing you to commit on the spot
"Limited time offer" or "special government program ending soon" — very few incentives have imminent deadlines
Any installer discouraging you from getting competing quotes

No Site Visit Before Quoting

A legitimate installer will always conduct an on-site assessment before providing a final quote. Satellite-only assessments miss critical details: roof condition, shading from nearby trees, electrical panel capacity, and attic access. Companies that quote entirely remotely are cutting corners.

Huge Upfront Deposits

A standard deposit is 10% to 20% of the project cost at contract signing. Anything over 25% is a red flag. Never pay the full amount before installation is complete. A typical payment schedule looks like this:

Payment	When	Typical Amount
Deposit	Contract signing	10–20%
Progress payment	Installation day	30–40%
Final payment	After inspection and PTO	Remaining balance

Unrealistic Promises

Be skeptical of any installer who promises:

"Free solar panels" — there is no such thing. Leases and PPAs involve monthly payments; they are not free. Learn more in our solar financing guide: cash vs. lease vs. loan.
"$0 utility bills guaranteed" — solar does not eliminate bills entirely. You will still have grid connection fees and usage beyond production.
"The government will send you a check" — that is not how tax credits work, and the residential credit expired in 2025 anyway.
Guaranteed savings percentages without analyzing your actual energy usage.

Government or Utility Impersonation

Scammers sometimes pose as utility or government representatives promoting "solar programs." Governments and utilities do not sell or install solar panels. If someone claims to be from your utility offering solar, hang up and call the utility directly.

Misleading Lease and PPA Terms

Watch for "$0 down" ads that do not disclose you will not own the panels, hidden escalator clauses (annual rate increases of 2% to 3% compounding over 20 to 25 years), and early termination fees that can exceed $10,000. Under third-party ownership structures, the TPO provider claims the Section 48E credit — not you. See our guide to solar incentives and tax credits in 2026 for details on what is still available.

Vague or Incomplete Quotes

Walk away from any quote that lacks specific panel brand and model, inverter type and brand, warranty details, or estimated annual energy production based on your specific roof. "Tier 1 panels" without specifying which brand and model is not acceptable — demand specifics. For help evaluating inverter options, see our guide to the best solar inverters for home.

Identity Theft and Phishing

Legitimate companies will not ask for your Social Security number, bank account information, or other sensitive data in the first conversation. Be wary of companies that want to run a credit check before you have committed to moving forward.

National Companies vs. Local Installers

This is one of the biggest decisions you will make, and the data clearly favors local installers for most homeowners.

National Installers

Pros:

Large volume of completed projects and extensive track record
More financing options, including in-house lending partnerships
Brand recognition and dedicated warranty departments

Cons:

Pricing is roughly 10% higher on average compared to local installers, according to NREL data
National companies provided higher estimates 70% of the time compared to regional installers
Frequently subcontract installation to local firms with varying quality
Longer wait times from contract to commissioning
Customer service through 1-800 numbers and automated systems
Less familiarity with local permitting quirks, HOA requirements, and utility interconnection processes

Local Installers

Pros:

Typically 10% lower pricing than national companies
Deeper understanding of regional regulations, weather patterns, and local roof types
More transparent pricing with fewer hidden fees
Expertise with local permitting, HOA rules, and utility interconnection and net metering
Faster response times for service calls — technicians are nearby
Personalized service with direct access to decision-makers
Invested in local reputation — bad reviews hurt more

Cons:

May offer fewer financing options
Smaller companies carry some risk of going out of business, which affects long-term warranty support
May have fewer resources for very large or complex projects

The Bottom Line

Local companies with strong reputations, five or more years in business, NABCEP certification, and solid financials are generally the best choice for most homeowners. If you choose a national company, verify they use in-house crews in your area and compare their price per watt against local quotes.

How to Compare Solar Proposals Side by Side

Prices vary 20% to 30% between installers for the same system, so getting multiple quotes is not optional — it is essential. Get at least three quotes, and always request a cash price as a baseline even if you plan to finance. Financed quotes can hide dealer fees that inflate the total cost.

Platforms like affiliate:EnergySage and affiliate:SolarReviews make it easy to gather and compare multiple quotes in one place.

The Proposal Comparison Table

When you have your quotes in hand, compare them using this framework:

Element	What to Look For
System size (kW)	Should match your energy usage based on 12+ months of utility bills
Panel brand and model	Specific brand and model — not just "Tier 1 panel"
Panel wattage	400W+ panels mean fewer panels needed
Number of panels	Fewer high-efficiency panels often beat more cheap ones
Inverter type	String, microinverters, or power optimizers — each has trade-offs
Inverter brand and model	Enphase, SolarEdge, and SMA are the top brands
Total gross cost	Full price before any incentives
Cost per watt (pre-incentive)	The primary apples-to-apples comparison metric
Estimated year-1 production (kWh)	Based on YOUR roof, not a generic national average
25-year production estimate	Should account for panel degradation
Warranty terms	Panel, inverter, and workmanship — listed separately
Permitting fees	Included or billed separately?
Interconnection fees	Included or billed separately?
Monitoring system	What app? Is it included? See our guide to the best solar monitoring apps
Payment schedule	Deposit amount, progress payments, final payment timing

Price Per Watt: The Key Metric

Price per watt (PPW) is the single most useful number for comparing quotes:

PPW = Total System Cost ÷ System Size in Watts

For example, a $21,000 system at 7,000 watts = $3.00 per watt.

Always compare the gross PPW (before incentives) for a true apples-to-apples comparison. Larger systems generally have lower PPW because soft costs like permitting, overhead, and customer acquisition are roughly fixed regardless of system size. For a deeper dive into costs, see our complete cost breakdown for solar installation.

What a Good Quote Looks Like in 2026

Understanding current pricing helps you spot outliers — both suspiciously cheap and overpriced quotes.

National Average Benchmarks

Average cost per watt: $2.50 to $3.50 before incentives (varies by state and equipment)
Average system cost: approximately $19,873 before incentives
Average system size: 7 to 10 kW

Example: 8 kW System in a Mid-Cost Market

Here is what a well-priced, quality installation might look like:

Line Item	Amount
Solar panels: 20× REC Alpha Pure 2 (400W each)	$6,400
Microinverters: 20× Enphase IQ8+	$3,200
Mounting and racking hardware	$1,600
Electrical (wiring, conduit, disconnects)	$1,200
Labor (installation, 1–2 days)	$3,200
Permitting and inspection fees	$800
Design and engineering	$600
Interconnection application	$200
Monitoring system (Enphase Enlighten)	Included
Total Gross Cost	$17,200
Cost per watt	$2.15/W

Actual pricing depends on your location, roof complexity, panel and inverter choices, and local labor rates.

For a detailed look at how equipment choices affect your bottom line, see our guide to choosing solar panels and our inverter comparison guide.

Cost Ranges by State (2026, Pre-Incentive, Per Watt)

State	Low	High
Arizona	$2.30	$2.65
Texas	$2.40	$2.80
Florida	$2.45	$3.00
California	$2.85	$3.50
New York	$3.00	$3.50
Massachusetts	$3.20	$3.60

2026 Tax Credit Context

The biggest change affecting solar economics in 2026: the Section 25D Residential Clean Energy Credit expired December 31, 2025, ended by the One Big Beautiful Bill signed July 4, 2025. There is no federal tax credit for homeowner-owned residential solar in 2026.

However, Section 48E (the commercial/business credit) remains available through the end of 2027 for third-party ownership structures like leases and PPAs. Systems must begin construction before July 4, 2026, or be placed in service by December 31, 2027. The credit is worth 30% to 50% depending on bonus adders like domestic content. TPO providers claim the credit and pass savings through lower monthly rates.

State incentives, utility rebates, SRECs, and net metering are still available in many states. For the full picture, read our guide to solar incentives and tax credits in 2026 and our guide to IRA clean energy tax credits.

35 Questions to Ask Your Solar Installer

Print this list and bring it to every consultation. A good installer will welcome these questions — a bad one will dodge them.

Company Background

How long have you been installing solar systems?
How many residential installations have you completed in total? In my area specifically?
Are you licensed to install solar in this state? Can I see your license number?
Do you carry general liability insurance and workers' compensation? Can I get a Certificate of Insurance?
Do you have NABCEP-certified installers on staff? How many?
Do you use in-house installation crews or subcontractors? If subcontractors, who are they?

System Design

What specific panel brand and model are you recommending, and why?
What type of inverter are you recommending — string, microinverters, or power optimizers — and why?
How did you determine the system size? Is it based on my actual utility bills (12+ months)?
What is the estimated year-one energy production in kWh, and what methodology or software did you use to calculate it?
Have you accounted for shading from nearby trees, buildings, or other obstructions?
Will you do an on-site roof assessment before finalizing the design, or is this satellite-only?

Equipment

Are the panels and inverters Tier 1? What is the panel efficiency rating?
What is the expected panel degradation rate per year?
What monitoring system is included? What app will I use to track production?
If I want to add a battery later, is this system battery-ready? What would need to change?

Costs and Financing

What is the total gross cost (cash price) before any incentives?
What is the cost per watt?
Are permitting fees, interconnection fees, and inspections included in the quoted price?
What financing options do you offer? What are the interest rates and terms?
Are there any dealer fees built into the financed price? What is the difference between the cash price and the financed total?

Warranties

What is the panel manufacturer's product warranty length? Performance warranty?
What is the inverter warranty length?
What is YOUR workmanship warranty length? What exactly does it cover?
If your company goes out of business, what happens to my workmanship warranty? Do you carry insurance-backed warranties?

Permitting and Timeline

Who handles the permitting process — you or me?
Who files the utility interconnection application?
What is the estimated timeline from contract signing to Permission to Operate (PTO)?
What is your current project backlog? How soon can you start?

Contract and Post-Installation

Can I review the full contract before the sales appointment ends? Can I take it home to review?
What is the cancellation policy and cooling-off period?
What is the payment schedule? How much is due upfront?
What happens if the system underperforms the production estimate in the first year?
Do you offer a production guarantee?
What is your process for post-installation service calls or warranty claims? What is your average response time?

Understanding Solar Warranties

Warranties are your long-term protection, and they are not all created equal. Here is what each type covers and what to look for.

Product and Equipment Warranty (From the Manufacturer)

This covers manufacturing defects, faulty materials, and workmanship in the panel itself. Historically 10 to 12 years, premium panels now offer 25-year product warranties.

Best-in-class product warranties:

REC — 25 years
SunPower/Maxeon — 25 years
Q CELLS — 25 years (select models)

Performance and Power Warranty (From the Manufacturer)

This guarantees minimum power output over time. Most manufacturers guarantee 80% to 85% of rated output at year 25, with no more than 2% degradation in year one and no more than 0.5% per year after that.

Best-in-class performance warranties:

SunPower/Maxeon — 92% at year 25
REC Alpha — 92% at year 25
Panasonic — 92% at year 25

Inverter Warranty (From the Manufacturer)

Inverters fail more often than panels, making this warranty critical:

Inverter Type	Standard Warranty	Notes
String inverters	10–12 years	Extendable to 20–25 years
Microinverters (Enphase)	25 years	One failing unit does not take down the whole system
Power optimizers (SolarEdge)	25 years on optimizers, 12 years on inverter	Inverter warranty extendable

For a detailed comparison of inverter types, see our best solar inverters guide.

Workmanship and Installation Warranty (From the Installer)

This covers the quality of the installation itself: roof penetrations, mounting, wiring, and electrical connections. Duration varies wildly from 1 to 25 years depending on the installer.

Minimum acceptable: 10 years from a reputable installer.

Critical warning: This warranty is only as good as the company's survival. If the installer goes out of business, the warranty is worthless. Some installers offer insurance-backed workmanship warranties (through providers like SolarInsure) that survive company closure. Always ask what happens to the workmanship warranty if the company closes.

If you're planning roof work alongside solar, read our guide on planning roofing and solar together — coordinating both projects can save money and protect your warranties.

The Installation Process: What to Expect

Understanding the typical timeline helps you hold your installer accountable and spot delays early. The full process from consultation to activation typically takes 60 to 90 days.

Phase 1: Consultation and Site Survey (Weeks 1–2)

The installer analyzes your energy usage, conducts an on-site survey of your roof's condition, orientation, and shading, then designs your system using solar design software. You will receive a proposal with one or more system options. This phase typically takes 3 to 10 business days.

Phase 2: Contract and Financing (Weeks 2–3)

You review and sign the contract, complete any financing paperwork, and pay the deposit (typically 10% to 20%). For help choosing between cash, loan, and lease options, see our solar financing comparison guide.

Phase 3: Permitting and Approvals (Weeks 3–7)

The installer submits building and electrical permit applications, files the utility interconnection application, and obtains any required engineering reviews. If you have an HOA, approval is needed at this stage. This is often the longest phase — 2 to 4 weeks in most jurisdictions, but up to 12 weeks in slow ones.

Professional Engineer (PE) stamp requirements have tightened significantly in 2025 and 2026, which can add time in some jurisdictions.

Phase 4: Equipment Procurement (Concurrent with Phase 3)

Panels, inverters, racking, and electrical components are ordered. Some installers stock common equipment; others order per project. This typically takes 1 to 3 weeks and usually overlaps with permitting.

Phase 5: Installation Day (Weeks 7–10)

The physical installation typically takes just 1 to 2 days for a residential system. A crew of 3 to 5 installers handles racking and mounting, panel placement, inverter installation, electrical wiring, and conduit runs. You may need to be home or accessible during installation.

Phase 6: Inspection (Weeks 10–11)

A local building and electrical inspector visits your site to verify code compliance. The inspection itself takes 1 to 2 hours, but scheduling can take 1 to 5 business days. Corrections and re-inspection may be needed.

Phase 7: Utility Approval and PTO (Weeks 11–13)

The utility reviews your interconnection application and inspection results, swaps or upgrades your meter if needed, and issues Permission to Operate (PTO). You cannot legally turn on your system until you receive PTO. This takes anywhere from a few days to two or more weeks — and up to 60 to 90 days in congested utility areas.

Phase 8: System Activation

Once PTO is received, the installer turns on your system, walks you through the monitoring app, and verifies initial production.

Where to Find Qualified Installers

Several platforms connect homeowners with pre-screened solar installers. Here are the most useful options.

EnergySage

affiliate:EnergySage is the nation's largest solar marketplace, with a network of over 500 pre-screened installers available in all 50 states. The platform has facilitated over $1 billion in solar installations and was acquired by Schneider Electric in 2022. Installers are ranked in tiers (Approved, Advanced, Elite, Elite+), and the platform lets you compare quotes side by side with guidance from solar advisors. The service is free for homeowners.

SolarReviews

affiliate:SolarReviews is a large review platform with installer reviews, ratings, and a proprietary ranking system. It connects homeowners with local installers and offers extensive educational content alongside its marketplace.

Other Options

NABCEP Professional Directory — find NABCEP-certified installers in your area at directories.nabcep.org
Local utility websites — many utilities maintain lists of approved or preferred installers
State solar energy associations — often maintain installer directories
Google Solar API / Project Sunroof — estimate your roof's solar potential before getting quotes

Post-Installation Checklist: Verify the Job Was Done Right

Do not assume everything is perfect just because the inspector signed off. Use this checklist to verify quality during the first month and beyond. For ongoing care guidance, see our solar panel maintenance guide.

Visual Inspection (Day 1)

Panels are aligned and evenly spaced
No visible damage to panels (cracks, chips, discoloration)
Wiring is neatly routed and secured with no loose or dangling cables
Conduit runs are clean and properly attached
Roof penetrations are properly sealed and flashed
No debris left on roof or property
Ground-level equipment (inverter, disconnect, meter) is properly mounted and labeled

Electrical Verification (Day 1)

All disconnects and breakers are properly labeled
System is properly grounded
Rapid shutdown device is installed and functional (NEC 2020+ requirement)
Main service panel breaker is properly sized and installed
No signs of overheating at any connection point

Performance Monitoring (First 30 Days)

Monitoring app is set up and reporting data
Daily production aligns with the installer's estimate (accounting for weather and season)
All panels and microinverters are reporting individually with no dead panels
No error codes or alerts in the monitoring system
Production pattern follows the expected curve: ramps up in morning, peaks midday, tapers in afternoon

Documentation (Confirm You Have These)

Contract, warranty documents, permit, inspection approval, and PTO letter
Installer's contact information for warranty claims
Panel and inverter serial numbers
As-built system design drawings
Confirmation that your homeowner's insurance has been updated to include the solar installation

Roof Inspection (6 Months After Install)

Check attic and ceiling below panels for any signs of water intrusion
Inspect roof penetrations from above if safely accessible
Look for shifted or loose panels after weather events
Verify flashing is still properly sealed

When to Call Your Installer Back

Contact your installer immediately if you notice:

Water stains on the ceiling below the panels
One or more panels showing zero or very low production in the monitoring app
System producing more than 15% below estimate (adjusted for weather)
Unusual noises from the inverter (buzzing, clicking)
Error codes or alerts in the monitoring system
Any visible damage after a storm

Frequently Asked Questions

How many quotes should I get before choosing an installer?

Get at least three quotes. Prices vary 20% to 30% between installers for the same system, so comparison shopping can save you thousands. Platforms like affiliate:EnergySage make it easy to gather multiple quotes quickly.

Should I choose a national company or a local installer?

For most homeowners, a local installer with a strong reputation, five or more years in business, and NABCEP certification is the better choice. Local companies typically charge about 10% less than national brands and offer more personalized service. National companies provided higher estimates 70% of the time compared to regional installers.

How long does the entire solar installation process take?

Expect 60 to 90 days from initial consultation to system activation. The physical installation takes just 1 to 2 days, but permitting and utility approval account for most of the timeline.

What is the most important warranty to look for?

The workmanship warranty from your installer is the most critical, because it covers the actual installation quality — roof penetrations, mounting, wiring, and electrical connections. Look for a minimum of 10 years, and ask whether the warranty is insurance-backed to survive if the company closes.

Is there a federal tax credit for solar in 2026?

The Section 25D residential credit expired December 31, 2025. There is no federal tax credit for homeowner-owned systems in 2026. However, solar leases and PPAs can still benefit from the Section 48E commercial credit through the end of 2027. State incentives, utility rebates, and SRECs remain available in many areas. See our complete guide to solar incentives in 2026 for details.

What should I do if my installer goes out of business?

First, check whether your workmanship warranty is insurance-backed — if so, the coverage survives. Your panel and inverter manufacturer warranties remain valid regardless of the installer's status. Contact the manufacturers directly for equipment warranty claims, and hire a different licensed installer for any needed repairs or maintenance.

How much should I pay upfront?

A standard deposit is 10% to 20% of the total project cost. Be wary of any installer requesting more than 25% upfront. Never pay the full amount before the system passes inspection and receives Permission to Operate.

Can I install solar if I need a new roof?

Yes, and in many cases it is smarter to do both at the same time. Installing solar on an aging roof means you may need to remove and reinstall the panels when the roof is eventually replaced — an expensive process. Read our guide on planning roofing and solar together for the complete strategy.

Your Installer Selection Action Plan

Here is a step-by-step action plan to go from research to signed contract:

Calculate your energy needs — gather 12 months of utility bills and determine your annual kWh usage
Get at least three quotes — use affiliate:EnergySage or affiliate:SolarReviews to request proposals from pre-screened installers
Verify credentials — check each installer's state license, insurance, NABCEP certification, and reviews
Compare proposals — use the comparison table in this guide to evaluate each quote on a level playing field
Ask the 35 questions — bring the list from this guide to every consultation and take notes on the responses
Check references — call three to five previous customers for each finalist
Review the contract carefully — take it home, read every clause, and do not sign under pressure
Confirm the payment schedule — make sure it follows the standard deposit-progress-final structure
Monitor the timeline — track each phase against the expected 60 to 90 day timeline
Use the post-installation checklist — verify quality before making the final payment

Going solar without the federal tax credit requires more careful shopping, but a well-chosen installer will still deliver a system that pays for itself in 8 to 14 years through electricity savings, state incentives, and increased home value. Take the time to choose wisely — you will be living with this decision for 25 years or more.

For more on making your solar investment work, explore our guides on solar financing options, maximizing net metering, and protecting your investment with proper maintenance.