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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.
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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.
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Every installer in the Marketplace has passed our key screening criteria and are approved to participate. For this reason, we’ve labeled the first tier in our rating system, the foundation for all of our installers, “EnergySage Approved”

Services Offered

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

Workmanship Warranty

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


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.


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.

Industry Certifications

  • Better Business Bureau
  • Solar Energy Industries Association
  • SunPower Premier Dealer

Manufacturer Certifications

  • Certified Installer
  • Premium Installer

What Customers Are Saying

400 reviews
Average Rating 400 review(s)
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Great Customer Experience

My neighbor recommended SolarUnion. She was satisfied with her system. When I ran my due diigence, all points of reference came back stellar. I am an experienced general contractor and can testify that not one thing was out of place, there were no shortcuts. Their installers were amazing and the project manager was always checking in to make sure we were comfortable during the construction process. Very much enjoyed the experience! SolarUnion is a solid company.

Posted by luna.s72 on Sep 21, 2022
Highly Recommended

Definetely the best customer service and products available! The specialist visited our house the next day we reached out and collected all information to send to designers so that they recommend the best solution for our needs. We signed up to get everything started a week from that first meeting. Our solar panels were up, connected and producing electricity within two days of construction! I was so impressed with the way everybody operates in this company. They had the answer all of our questions. There are no high pressure tactics or salesmanship. We would recommend them to anybody. You can't go wrong with SolarUnion.

Posted by robert.neyra on Sep 21, 2022
Bait and Switch

I selected them based on the quote and when they called they said upfront, there is no way they could honor that quote and that they are told by Energy Sage to quote $3 per watt or below. I went around and around trying to get them to just add 1-2 panels, without changing to another lower power panels, or adding 4 panels instead. The final quote was about the same as a local installer with tons of local references - so why bother.

Posted by rstarkst on Sep 20, 2022
45 mins late call on their rescheduled Time.

Solar Union was the top 2 of my list of installers. I had set up a consultation for 9:30am and they had rescheduled to 10:00am which I was okay with. I did not receive a call until 10:45am. This is just bad especially for first impression. First impressions are everything and if they can get to a meeting on time, who knows what will happen down the road. They have just lost my business.

Posted by vnlocs on Sep 08, 2022
Lowball proposal followed by reneging on initial quote

I thought that Solar Union was a reputable company. They are not. They would not even honor their original (lowball ) quote. I received a second quote on the last day that the first was supposed to be valid. That second quote, for the same system was for approximately $2200 more than their first quote (which was for $3/W). I will never do business with such a company. I recommend that Energy Sage de-list them from their approved list of vendors.

Posted by lgwiley on Aug 02, 2022
Superb / Excellent Experience

After several quotes considerations I decided to go with SolarUnion. Although they weren't the cheapest quote they do provide a more extensive/comprehensive maintenance/labor warranty than anyone else, which is very valuable for me, justified the difference in price and was the principal initial reason why I went with them. I couldn't be more happy with the professional customer service, support, and willingness to answer all my questions. Much to my surprise, the entire process took way less than what I expected and as of today with my solar system is producing energy. Many thanks to the entire SolarUnion team. Everyone including the installation team was great to work with, EXCELLENT JOB.

Posted by mayascott1969 on May 09, 2022



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