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Best Solar Panel Installers near Castro Valley, CA
1 of these contractors is based in Castro Valley; the others serve Castro Valley from towns including Hayward (5 mi), Dublin (9 mi) and San Ramon (8 mi).
1 open 24/7 · 11 open weekends · 18 rated 4.5+ · 10 show a license
Data verified October 15, 2026
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Sunvalley Solar
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Synapse Electric
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Century Roof and Solar
- Solar System
- Project
- Work
“I am a very detail-oriented person and, thus, asked Tony many questions as the project progressed, but he was extremely patient with me as each step was completed, and we couldn't be more pleased with the quality job (new roof and solar) that was don...”
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Smart Solar Panel Cleaning Bay Area
- Price
- Pictures
- Washed
“We had to reschedule once due to the weather, but he showed up on time, explained what he was going to do and was fast about performing the work cleaning our gutters and solar panels.”
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Solar Bill Review
- Electric
- System
- Information
“I just now had my 3rd bill review with Adrian to discuss the best PG&E Plan for me considering my usage and production patterns and that with the EV addition and absolutely loved the guidance and consultation.”
The 24 contractors listed for Castro Valley, CA design and install rooftop solar and battery systems. Each entry repeats what the company publishes about certifications, the equipment it fits and its hours, together with star ratings and comments drawn from public reviews.
Area overview: Castro Valley, CA
21 of the 24 contractors on this page have a rating, from 4.0 to 5.0 across 888 reviews; 6 have 50 or more reviews and 18 are rated 4.5 or higher. When customers rate these contractors on specific qualities, they most often praise professionalism (90%), responsiveness (82%) and quality (80%). The topics that come up most in reviews of the contractors on this page are "price", "communication" and "estimates". 1 is open around the clock; 11 are open on Saturdays and 7 on Sundays. 10 show a license on their websites and 2 have a BBB rating of A or A+. Domain records put 12 websites of the contractors on this page at ten or more years old; the oldest dates from 2001. 2 offer emergency call-outs; 4 offer financing or payment plans; 11 give free estimates; 2 are family- or locally-owned and 1 lists coupons or special offers. We have a website on file for all 24 of the contractors on this page; 22 publish a contact page; 17 list a public email and 2 take bookings online. We count these figures across the contractors on this page; distances are straight-line, and hours and prices change, so confirm the details with the contractor before you book.
Can a survey happen outside working hours?
Weekend hours appear for 11 of the 24 contractors here, which is often when a roof survey is easiest to arrange around work. The survey itself wants daylight and dry weather, since someone has to get onto the roof or fly a drone over it to check the covering and measure shading.
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Besty Solar Inc.
- System
- Questions
- Profession
“The installation process was smooth, and Cindy's team was very respectful of our property, ensuring everything was clean and in order after the job was completed.”
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Solar Pro Energy Systems
- House
- Team
- Meeting
“At the end of Sept, I contacted Steve about installing solar panels and by mid November, the panels were installed, the outdated 70+ electrical panel was replaced and the solar switch was turned on.”
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Sierra Roofing and Solar
- Questions
- Estimate
- Dry Rot
“This past Sunday when we had all that rain all day, my drain on my roof was clogged with leaves, which meant all this water had no where to go but inside my place, thru my skylight, my can lights, it was terrible.”
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Sun Light & Power Solar
- Bill
- Price
- House
“We have an almost 100 year old very energy inefficient home and the solar system installed by Sun Light & Power a number of years ago has made a huge difference in our comfort and peace of mind.”
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Northstar Solar Inc
- Quote
- Team
- Solar Panels
“When I spoke with Pierce Wahrlich,the sales rep ,he did a comprehensive review of my hourly usage which helped a great deal in deciding how many panels I needed and what size batteries would be required.”
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Source Energy
- House
- System
- Bill
“I called a couple companies I found on google but wasn't really impressed with anyone then a couple days later I saw a nice clean straight forward Facebook ad that got my attention.”
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BEI Construction
“Great Business contractors and engineering”
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Sunlight Electri-Cal Solutions
- Price
- Solar System
- Battery
“After trying to deal with Tesla (they bought out the company that installed my system and were NO help at all) I turned to Sunlight Electri-Cal Solutions.”
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Sky Power Solar
- Solar Panel
- Price
- Electricity
“When I was in the market recently for another new solar installation, I reached out to Sky Power in addition to the other two larger installers - Sun Run and Solarcity.”
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Solarsesame
- Solar Panels
- Bill
- Research
“As someone who is interested in switching to solar power but didn't know where to start, Solar Sesame's online calculator tool broke it down and made it approachable.”
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Save a Lot Solar
- Battery
- Solar Panels
- The Environment
“We have an older-type "hot-mop" (aka "tar and gravel") roof and when we decided to investigate installing solar, we found that the big-name solar corporations didn't want to touch it, or it was "I'll get back to you on that" (and they never did).”
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Enact Solar
- Team
“Enact and Jessica have been helpful when we had an issue with the inverter.”
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HRC Roofing and Solar
“The owner, Cris Hernandez, is easy to work with and takes time to explain what products are available and answers questions patiently and completely.”
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Lundy Solar and Roofing Co.
- Work
- Team
- Price
“Lundy stood out both in their reasonable bid and also willingness to take on all aspects (in particular - somehow gutter covers scared a couple companies away).”
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Singh Solar Couple
- Understanding
- Project
- Knowledge
“Navjot from Singh Solar Couple is a thorough professional person, this is the 2nd time we got the system from them- 1st at our Brentwood house and now at our Orinda house.”
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Greentech Renewables SF Bay Area
- DIY
“Noah delivered a ton of gear for my solar project and despite the fact that the driveway was steep and the gear was some really heavy stuff, he did an excellent job.”
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HCI Solar
“Rolando Jimenez Lincoln.”
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Advanced Home Energy
- Efficiency
- Clean
- Furnace
“Advance Home Energy came out to my home and did a very thorough analysis of my energy needs, and made me aware of potential problems with my heating devices - stove, furnace, etc.”
Solar Panel Installation Services in Castro Valley, CA Cost Estimates
Minimum cost
$4869
Maximum cost
$47601
National Average
$25220
Avg Per Hour Rates
$125
$17584
$32994
Typical price range is based on 424 cost profiles
Why these companies made our list
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