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Solar Installer GuildUnited States · independent

Alcor Solar

Solar energy company · Concord, CA

What the listing shows you

4.0★

8 Google reviews

What it doesn’t

25%

rated 1–2★

typical in Concord, 12%

Newest review held

Aug 2026

newest held review this month

Google's rating breakdown · all 8 reviews

Rated 1–2★
25%
typical in Concord, 12%
Posted an update
—
we saw no owner post, which is not the same as none existing
Replies to reviewers
0%
of the 8 reviews we hold

Its one and two star share is 13 points above the typical installer in Concord. Across California, 175 of the 1,529 installers whose breakdown Google has published carry a higher share than this one.

The percentages are Google’s own arithmetic over every review it holds, not a sample we assembled. Separately we hold 8 review texts for this company, quoted below. Google publishes review ages rather than dates, so every date here is approximate.

Every company we hold in Concord, on one axis

0% rated 1–2★30%

Each mark is one company we hold in Concord whose Google breakdown has been read, placed by its share of one and two star reviews. Alcor Solar is the red one. The amber line is the middle of that set, which includes suppliers and maintenance businesses as well as installers.

What reviewers said

  • 1★ · around August 2025

    I agree with the previous comments about the unprofessionalism of this business. Scheduling is a nightmare, and Al gets very irritated if you ask for timing so they can access your roof. The owner appears very unstable based on email exchanges; they lost our payment, then found it. In the meantime, they refused service, and when they found the check we provided, they asked to cash it in exchange for servicing manufacturer defects with Solar Industries collectors. They are exclusive in the area so I would look elsewhere as you are stuck with someone who is a little off. They don’t stand by thei

  • 1★ · around August 2018

    Do not use this service. This company is unprofessional and their quality of work is terrible. They don’t provide notice of when they will show up for service calls and then bill you when the problem still persists.

  • 5★ · around August 2026

    I recently hired Alcor Solar to install new solar thermal panels on our roof, along with an automatic controller and a three-way solar valve to better regulate the temperature of our pool. I couldn’t be happier with the experience. From start to finish, the team was incredibly responsive to the many questions I had. They were also very flexible and accommodating when I had a few scheduling hiccups on my end, which I really appreciated. The installation itself was smooth, efficient, and professionally done. Within just a few days, our pool reached optimal temperature, and it has never felt warm

  • 5★ · around March 2026

    We just had solar panels installed for our pool, but it’s still too cold to turn them on, so I can’t speak to the product itself yet. However, I was very impressed with the customer service Sue provided and with the professionalism of the two men who installed the panels.

  • 5★ · around August 2021

    My family first used Alcor Solar when our first pool solar panels were installed in the 90's. We had the roof redone in 2013 and had updated pool solar panels installed then. We recently had Alcor come out to repair a leaking solar panel. They are responsive, honest, and always go above and beyond. And Al is the best :)

Reviewer names are not published here. Negative reviews are shown first because they are the ones a listing hides, not because they are more representative.

What reviewers keep mentioning

  • roof 2
  • valve 2
  • industries 2
  • pool solar panels 2

Topics Google derives from the review text, with how often each appears. A frequent topic is not a good one: “price” turns up in praise and in complaints alike.

What the company says about itself

Taken from its own website. We have not checked any of it, and a sentence on a website is not evidence.

  • Years in business

    “and ethical business practice. For over 40 years, ALCOR has proudly served the Bay…”

  • Licensed

    “sustainable living. ALCOR is licensed through the "Contractors State…”

Its website also mentions established and insured, but not in a sentence we can quote cleanly.

Elsewhere

  • It is also reviewed on Yelp. Worth reading before you sign anything: those are a different crowd, and the complaints that reach the Better Business Bureau rarely reach Google.

When they say they are open

Sunday
Closed
Monday
8 AM to 5 PM
Tuesday
8 AM to 5 PM
Wednesday
8 AM to 5 PM
Thursday
8 AM to 5 PM
Friday
8 AM to 5 PM
Saturday
Closed

As Google published them when we last read the listing, not a live check. Ring before you drive anywhere.

Who Google shows alongside them

Google’s own “people also viewed” set, in Google’s order. It is Google’s comparison, not ours.

The ones without a link have no page here, either because Google does not categorise them as solar businesses or because we could not match the name to a listing with confidence.

Other installers around Concord

1–2★3★4★5★gauge 0–20%typical here, 12%

Ordered by how much we can tell you about each, which is not an order of quality. We do not know which of these is better and would not say if we did.

What we don't know

  • The date above is the newest review we hold, which is not necessarily the newest that exists — we hold a large share of Google's reviews, not all of them.
  • We do not verify licences, insurance or bonding. Nothing here has been checked against a state licensing board.
  • We cannot tell you what an installation costs, and we hold nothing about the equipment they fit.

Something wrong here? Tell us and a person will read it.

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