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We have 3 contractors in Castro Valley on file, and all of them are on this list, along with 21 from towns including Oakland (3, 10 mi), Berkeley (3, 16 mi) and Hayward (2, 5 mi).
5 open 24/7 · 12 open weekends · 22 rated 4.5+ · 11 show a license
Data verified October 15, 2026
The 24 contractors listed for Castro Valley, CA cover panels, circuits, lighting and charger installs. What appears under each one about licensing, hours and the work it advertises is taken from that business's own site, with ratings and comments from public reviews.
22 of the 24 contractors on this page have a rating, from 4.5 to 5.0 across 2,218 reviews; 11 have 50 or more reviews. When customers rate these contractors on specific qualities, they most often praise professionalism (87%), quality (83%) and responsiveness (80%). The topics that come up most in reviews of the contractors on this page are "price", "estimates" and "communication". 5 are open around the clock; 12 are open on Saturdays and 9 on Sundays. 11 show a license on their websites; 1 lists staff certifications (EPA) and 8 have a BBB rating of A or A+. 15 have ten or more years of experience, the longest 89 years. 6 offer emergency call-outs; 3 offer financing or payment plans; 4 give free estimates; 7 are family- or locally-owned and 3 list coupons or special offers. We have a website on file for 22 of the contractors on this page; 20 publish a contact page; 18 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.
Free estimates are advertised by 4 of the 24 contractors here. That works for scoping a defined job such as a panel change or a rewire. Fault finding is different work: tracing an intermittent problem takes hours on site, and asking for that free gets you a guess.
