How to Choose the Best Solar Company in Chicago: A Step-by-Step Guide

Step 1: Only Work With Full-Service Local Installers

Not every company that quotes you will install your system.

Full-service local installers use their own crew, pull their own permits, and handle everything from the site visit to your ComEd interconnection. They are accountable for every part of the job.

National companies frequently hand off the actual installation to local subcontractors you have never met. Quality depends on whoever shows up, not the brand name on the contract.

Lead generation sites look like solar companies but their business is selling your contact information to multiple installers. Before filling out any online form, confirm the company has its own installation team and a real permit history in Chicago.

Always ask directly: does your own crew install my system? A vague answer tells you everything you need to know.

Source: Illinois Solar Energy Association (illinoissolar.org)

Step 2: Verify the Licenses Illinois Actually Requires

Illinois ICC Distributed Generation Certification

Illinois law requires any company installing solar on someone else's property to hold a Distributed Generation Installer Certification from the Illinois Commerce Commission. Ask for documentation before going any further. A legitimate company provides it without hesitation.

Source: NABCEP (nabcep.org), Illinois Solar Energy Association (illinoissolar.org)

NABCEP Certification

NABCEP is the gold standard credential in the U.S. solar industry and one of the accepted pathways to the Illinois DG Certification. Ask whether the company employs NABCEP-certified professionals on permanent staff, not just as occasional consultants.

Chicago Permit Requirements

Chicago's Express Permit Program covers most residential systems and can issue same-day approval. Every installation still requires electrical drawings signed by a Chicago-licensed supervising electrician or engineer, confirming the roof can handle the load and the work meets the Chicago Electrical Code.

Companies without a genuine Chicago permit history regularly underestimate these requirements. The result is failed inspections, delays, and compliance issues that can surface when you eventually sell your home.

Source: City of Chicago Department of Buildings (chicago.gov)

Step 3: Check Reputation Beyond Star Ratings

Check the Better Business Bureau (bbb.org) for complaint history and how those complaints were resolved. The pattern matters more than the overall rating.

Look for companies that have worked in Chicago for at least five years with a consistent review record. Longevity tells you whether the company is likely to still be reachable in year eight when something needs attention.

Ask for references from Chicago homeowners specifically. Out-of-state or suburban installs tell you nothing about how a company handles Chicago's permit process.

Step 4: Evaluate Quotes Against Clear Benchmarks

Quotes well below $3.00 per watt almost always mean lower-grade equipment or less experienced labor. Quotes well above $4.50 per watt need a clear explanation of what justifies the premium.

Always ask for both a cash price and a financed price. Solar loan dealer fees can add 20% or more to the total. Comparing a financed quote from one company against a cash quote from another is not a fair comparison.

Get at least three quotes from verified local installers, set aside the outliers, then decide based on equipment quality, warranty terms, and how clearly each company explains your incentives.

Source: SolarReviews (solarreviews.com)

Step 5: Make Sure Your Installer Knows Illinois Incentives Cold

Illinois Shines — SREC Program

Illinois Shines pays you an upfront lump sum based on the Solar Renewable Energy Credits your system is projected to generate over 15 years. One SREC equals one megawatt-hour of electricity produced.

This payment goes to your installer first as an Approved Vendor, then passed through to you. Before signing, ask in writing exactly how much of this payment you receive and whether that figure is guaranteed in the contract. Some installers take fees off the top or pass through only part of it.

Source: Illinois Power Agency (ipa.illinois.gov)

ComEd Distributed Generation Rebate

ComEd pays a cash rebate directly to you for every kilowatt of solar installed, when your system uses a qualifying smart inverter. This stacks on top of Illinois Shines and is one of the more straightforward utility incentives available to Chicago homeowners.

Source: EnergySage (energysage.com)

Six Questions to Ask Before You Sign

Does your own crew install my system or do you use subcontractors?

Do you hold the Illinois ICC Distributed Generation Installer Certification?

Do your installers carry NABCEP certification?

Are you an Approved Vendor for Illinois Shines and how much of the SREC payment comes to me, guaranteed in writing?

What panels and inverters do you use and what are the full warranty terms?

What is your timeline from signed contract to ComEd interconnection?

Red Flags That Should End the Conversation

Pressure to sign the same day. No legitimate company needs an immediate decision on a 25-year investment.

Vague answers about who actually does the installation.

No Chicago-specific permit history.

Pricing well below $3.00 per watt with no explanation.

Not Sure About a Quote You Already Have?

If something feels off — the numbers do not add up, the incentive explanation was vague, or you are not clear on who is doing the work — it is worth one more conversation before you sign.

At Quality Solar we hold the Illinois ICC DG Certification, work with NABCEP-certified professionals, use our own installation crew, and are an Approved Vendor for Illinois Shines. We walk you through your actual net cost and every applicable incentive before you commit to anything.

Get a free second opinion at qualitysolarepc.com