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SolarUnion - Profile & Reviews

We are a full-service solar developer and installer founded in the heart of Silicon Valley. We sell, design, install and service high efficiency solar systems to deliver clean electrical power at affordable rates. Our clients (residential homeowners) start to enjoy savings from Day 1, with significant cumulative savings over the life of the system. Our goal is to transform the market and enable all Californians to unlock the power of clean energy.

383 reviews

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  • "Bait and Switch"

    "Bait and Switch"

    Reviewed Jan 21, 2022

    I received a quote from Solar Union through Energy Sage. When I spoke with Solar Union's representative "Tom" he quoted me a second proposal for a panel system with less panel capacity but which was over 150% more than their initial quote, and almost $2,000 more then their battery quote. Even the price per watt jumped almost by $0.70 per watt with no explanation. When I asked about this dramatic price difference between Solar Union's first quote through Energy Sage, and his proposal, he told me he didn't know who at His own company prepared the Energy Sage quote and told me to "stop harping" on Solar Union's own quote. When I asked him for a proposal more in line with Solar Union's first quote, or any explanation on the price difference, he was uninterested in my business and hung up.

  • "They keep their word"

    Reviewed Nov 17, 2021

    We choose SolarUnion for two reasons. Their contract and their product. SolarUnion offers 25 years of warranties. If I need solar panels replaced, I can call them anytime and get it done. This warranty means... peace of mind for me. The warranty from SolarUnion is priceless and the strength of client rights in the contract provide compelling reasons for choosing SolarUnion. I am looking forward to the installation. We are very pleased with SolarUnion.

  • "New at Solar for my property"

    Reviewed Nov 17, 2021

    Loved working with SolarUnion specifically my consultant and everybody, sales, customer service, operations and installers were awesome! Happy the right system size and advice throughout the process.

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SolarUnion is the only Diamond Certified Solar Company in the State of California that offers a 25-year performance guarantee on (i) parts, (ii) labor, (iii) roof attachments and (iv) power output.
We are rated highest in quality on customer satisfaction, insurance coverage, license and business practices. We offer a premium solar experience to our customers.
The SolarUnion Team includes in-house certified C46 and C10 solar electricians and carefully vetted installers with decades of experience installing residential solar across California. We can execute on concrete tile roofs, flat roofs, tar and gravel roofs, metal roofs and foam roofs.
Each premium SolarUnion solar system includes:
*All permits, inspections and conversations with electrical, building, structural, environmental and fire inspectors. SolarUnion also works with your electric company for interconnection of the solar system to the grid
*Optimizers (one per panel) to fight shading issues, maximize system performance, and monitor output panel by panel.
*Premium inverters (rated excellent), battery backup ready.
*Individually-designed solar systems that are tailored to your needs and preferences. Each customer is assigned a SolarUnion Project Manager from Day 1 who is the primary contact throughout the entire solar process - from design to interconnection. We work with each of our customers to make sure they are satisfied with the components, service, aesthetics and long-term performance of their premium solar system.
*Complimentary monitoring hardware and software, including a mobile app.

  • Installation
  • Financing
  • Energy Auditing
  • Construction
  • Electrical Contracting
  • General Contracting
  • Solar Repair & Maintenance
  • Energy Efficiency
  • Solar PV
  • Energy Storage

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Get a custom solar estimate for your home

Get a custom solar estimate for your home

Based on your roof and actual offers in your area

Try Solar Calculator



SolarUnion Headquarters

1700 Montgomery Street, Suite 108
San Francisco, CA
94111 United States

Local Offices (3)

  • 42 N Sutter Street
    Stockton, CA 95202
  • 783 Goetschl Street
    San Diego, CA 92114
  • 815 Brazos St., Ste 500
    Austin, TX 78701

Workmanship Warranty

SolarUnion customers enjoy a 25-year power output, workmanship, parts and labor guarantee


SunPower Tax Lease Fund, GreenPACE Capital, Trina Solar, Renew Financial, HERO, YGrene Works, mPOWER.


Panasonic Authorized Installer with Panasonic INC providing a 25 year warranty parts and labor warranty on all SolarUnion systems. LG Pro installer. REC Certified Professional installer. SolarEdge certified installer.


Fully licensed electrical and solar contractor (C-10 Electrical and C-46 Solar)


Fully insured/bonded | Insurance policy in excess of $5,000,000 per event at the system level.

States served by SolarUnion

  • California CA ,
  • Texas TX