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Solar Installer GuildUnited States · independent

Custom Solar

Solar energy equipment supplier · Boulder, CO

What the listing shows you

4.6★

29 Google reviews

What it doesn’t

7%

rated 1–2★

typical in Boulder, 6%

Newest review held

Jul 2026

newest held review this month

Google's rating breakdown · all 29 reviews

Rated 1–2★
7%
typical in Boulder, 6%
Posted an update
—
we saw no owner post, which is not the same as none existing
Replies to reviewers
21%
of the 29 reviews we hold

Its one and two star share is 1 point above the typical installer in Boulder. Across Colorado, 70 of the 216 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 29 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 Boulder, on one axis

0% rated 1–2★20%

Each mark is one company we hold in Boulder whose Google breakdown has been read, placed by its share of one and two star reviews. Custom 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 2022 · the company replied

    They really earned a one-star rating. After a pleasant install, they were thoroughly irresponsible and unreliable with further work.

  • 1★ · around August 2019 · the company replied

    Perhaps the sloppiest, laziest, most disinterested pre-sales process I've ever had the unfortunate experience of being involved in. First proposal I received: a copy of the energy consumption spreadsheet which I had sent them to begin the process. Second proposal: a PDF showing bunch of panels on a house half a block away. Third proposal: literally exactly the same PDF, but with a Google Maps satellite image of my house pasted in. Unreal.

  • 5★ · around July 2026

    We got a thorough proposal from their sales team, good communication from the project manager, and a clean and functional system from the installation crew. A solid company with a well-earned reputation for quality and service.

  • 5★ · around July 2026

    Custom Solar did my original rooftop system in 2013. It has worked without issue since then. Recently they installed a battery backup for my system, and once again I found them to be competent, courteous, and communicative. I'm very happy with their work, and highly recommend the company.

  • 5★ · around April 2026

    We couldn't be more thrilled with Custom Solar!! The entire team, from sales (Daniel) to design (Imanol, Patrick) to installation (Chris and Rob), all were amazing people to work with. We are so happy with our battery backup system, peace of mind for the ongoing outages we've had this winter.

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

  • friendly staff 5
  • roof 4
  • battery 3
  • overall experience 2
  • personal manner 2
  • design 2
  • neat installation 2
  • quality of work 2
  • polite team 2
  • efficient team 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.

  • Established

    “with sustainable energy solutions since 2008. Homeowners, contractors, architects,…”

  • Years in business

    “company, serving the community for over 15 years. We understand the climate, the…”

Its website also mentions free estimate, 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 Boulder

1–2★3★4★5★gauge 0–20%typical here, 6%

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.

Do you run Custom Solar?

Claim this listing to become its verified contact: correct your own phone number, hours and description, and hear first if anything here changes. Free, reviewed by a person — and it changes nothing about the numbers.

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