118 solar installers ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →
Best overall in Cotati: Sunlight Solar Clean, CR Score 64/100; 5.0★ from 484 Google reviews; open 7 days a week.
Best for emergencies (open 24/7): Ongaro & Sons, posts 24/7 hours; ranked #5 of 118.
Most-reviewed: SunPower®, 1,576 Google reviews at 4.5★, the most of 118 ranked; ranked #8.
Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank
118 Cotati solar installers are ranked here by CR Score, from ten published factors. 16 are open 24/7, 56 open Saturdays and 32 open Sundays, based on posted hours. The median Google rating is 5.0★ across 118 rated businesses.
| Rank | Business | CR Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | Sunlight Solar Clean | 64 | 5.0★ (484) | Santa Rosa, 9 mi away | Sat · Sun · Evenings | Overall |
| 2 | Sunrun Solar | 63 | 4.8★ (472) | Petaluma, 6 mi away | Sat · Sun | — |
| 3 | Sonoma Solar Clean | 61 | 5.0★ (157) | Santa Rosa, 15 mi away | Sat · Sun · Evenings | — |
| 4 | Shine On Solar & Maintenance | 60 | 5.0★ (45) | Cotati | Sat · Sun | — |
| 5 | Ongaro & Sons | 60 | 4.9★ (1,222) | Santa Rosa, 8 mi away | 24/7 | Emergencies |
| 6 | Solar Santa Rosa | 60 | 5.0★ (33) | Santa Rosa, 9 mi away | 24/7 | — |
| 7 | Ongaro & Sons | 59 | 4.9★ (538) | Petaluma, 6 mi away | 24/7 | — |
| 8 | SunPower® | 59 | 4.5★ (1,576) | Richmond, 34 mi away | Sat · Sun · Evenings | Most reviews |
| 9 | Solano Solar Cleaning LLC | 58 | 5.0★ (40) | Petaluma, 3 mi away | Sat · Evenings | — |
| 10 | First Response Solar | 57 | 5.0★ (90) | Santa Rosa, 8 mi away | — | — |
Ordered by CR Score, a 0–100 score from ten published factors. Paid placement never changes the order.
Scores below: based on 8 of 10 factors; credentials and recency not yet collected. Hatched segments mark factors we don't have yet.
Ranked #1 because of its Google rating and trade focus: 5.0★ from 484 Google reviews, listed on Google as “Solar panel maintenance service”.
Based in Petaluma, 6 mi away
Ranked #2 because of its Google rating and trade focus: 4.8★ from 472 Google reviews, listed on Google as “Solar energy company”.
Based in Santa Rosa, 15 mi away
Ranked #3 because of its Google rating and trade focus: 5.0★ from 157 Google reviews, listed on Google as “Solar energy company”.
Based in Cotati
Ranked #4 because of its Google rating and trade focus: 5.0★ from 45 Google reviews, listed on Google as “Solar panel maintenance service”.
Based in Santa Rosa, 8 mi away
Ranked #5 because of its Google rating and review volume: 4.9★ from 1,222 Google reviews.
Based in Santa Rosa, 9 mi away
Ranked #6 because of its Google rating and trade focus: 5.0★ from 33 Google reviews, listed on Google as “Solar energy company”.
Based in Petaluma, 6 mi away
Ranked #7 because of its Google rating and review volume: 4.9★ from 538 Google reviews.
Based in Richmond, 34 mi away
Ranked #8 because of its Google rating and review volume: 4.5★ from 1,576 Google reviews, the most in Cotati.
Based in Petaluma, 3 mi away
Ranked #9 because of its Google rating and trade focus: 5.0★ from 40 Google reviews, listed on Google as “Solar panel maintenance service”.
Based in Santa Rosa, 8 mi away
Ranked #10 because of its Google rating and trade focus: 5.0★ from 90 Google reviews, listed on Google as “Solar energy company”.
Based in Sebastopol, 10 mi away
Ranked #11 because of its Google rating and trade focus: 5.0★ from 15 Google reviews, listed on Google as “Solar energy company”.
Based in Sebastopol, 7 mi away
Ranked #12 because of its Google rating and trade focus: 4.9★ from 84 Google reviews, listed on Google as “Solar energy company”.
Based in San Anselmo, 26 mi away
Ranked #13 because of its Google rating and review volume: 4.9★ from 762 Google reviews.
Based in Sebastopol, 8 mi away
Ranked #14 because of its Google rating and trade focus: 5.0★ from 64 Google reviews, listed on Google as “Solar energy company”.
Based in Rohnert Park, 7 mi away
Ranked #15 because of its Google rating and trade focus: 5.0★ from 20 Google reviews, listed on Google as “Solar panel maintenance service”.
Based in Sebastopol, 4 mi away
Ranked #16 because of its Google rating and review volume: 4.9★ from 84 Google reviews.
Based in Windsor, 15 mi away
Ranked #17 because of its Google rating and review volume: 5.0★ from 866 Google reviews.
Based in Larkfield-Wikiup, 8 mi away
Ranked #18 because of its Google rating and review volume: 5.0★ from 75 Google reviews.
Based in Benicia, 28 mi away
Ranked #19 because of its Google rating and trade focus: 5.0★ from 14 Google reviews, listed on Google as “Solar energy company”.
Based in Santa Rosa, 4 mi away
Ranked #20 because of its Google rating and trade focus: 4.7★ from 46 Google reviews, listed on Google as “Roofing contractor”.
Based in Sebastopol, 8 mi away
Ranked #21 because of its Google rating and trade focus: 4.8★ from 47 Google reviews, listed on Google as “Solar energy company”.
Based in Napa, 22 mi away
Ranked #22 because of its Google rating and trade focus: 5.0★ from 6 Google reviews, listed on Google as “Solar energy company”.
Based in Petaluma, 9 mi away
Ranked #23 because of its Google rating and trade focus: 4.4★ from 101 Google reviews, listed on Google as “Solar energy company”.
Based in Fairfield, 22 mi away
Ranked #24 because of its Google rating and trade focus: 5.0★ from 30 Google reviews, listed on Google as “Solar panel maintenance service”.
Based in Petaluma, 5 mi away
Ranked #25 because of its Google rating and trade focus: 4.3★ from 12 Google reviews, listed on Google as “Solar energy system service”.
#1 to #25 are shown in full above. Here are #26 to #50, in CR Score order; each links to its profile. We publish the top 50 of 118 ranked solar installers here; the rest are on their profiles.
20 more solar installers within 40 mi that we can't rank yet: too few reviews, or a trade we couldn't confirm. Listed A to Z.
| Business | Google rating | Distance |
|---|---|---|
| All American Air & Solar System | 5.0★ (1) | 9 mi |
| Aloha Solar | 5.0★ (1) | 5 mi |
| Alta Energy | 5.0★ (1) | 8 mi |
| Bluetail Industries | 5.0★ (1) | 5 mi |
| Elevated Comfort | 4.9★ (949) | In Cotati |
| First Response Solar | 5.0★ (1) | 9 mi |
| Great Solar Panels | 5.0★ (1) | 7 mi |
| JBL Solar Energy | 5.0★ (1) | In Cotati |
| NationWize Solar | 1.5★ (2) | 35 mi |
| New Dimension Roofing and Solar | 5.0★ (2) | 38 mi |
| Prime Energy Solar | 5.0★ (1) | 10 mi |
| Pura Vida Solar Company | 5.0★ (1) | 10 mi |
| Santa Rosa Solar Panels | 5.0★ (1) | 8 mi |
| Smart Energy USA | 5.0★ (1) | 7 mi |
| Solar Dealers | 5.0★ (2) | 5 mi |
| Solar Energy JKL | 5.0★ (2) | 34 mi |
| Solaris Construction Inc. | 5.0★ (1) | 7 mi |
| SUN PIRATE SOLAR CONTRACTING | In Cotati | |
| Suntopia | In Cotati | |
| You Benefit Solar | 3.0★ (2) | 8 mi |
Typical prices in USD, adjusted for California with a published regional index. Each row names its basis and month.
| Job | Low | Typical | High | Basis | Checked |
|---|---|---|---|---|---|
| Solar panel installation | $29,770 | $33,680 | $36,640 | Per system: about 12 kW at about $2.60 per watt, before incentives. US national range × 1.08 Pacific factor (2025 Cost vs. Value Report) | October 2026 |
We scored 118 Cotati solar installers on ten factors, weighted as shown. A business is ranked when its trade is confirmed and it has 3 or more Google reviews or a claimed profile. A business with no Google reviews scores zero on rating, review volume and recency. Other unknown factors are left out, not counted as zero. Scores last refreshed October 22, 2026.
Paid placement never changes a rank or score. Featured businesses are paid, labelled, limited to 3 and shown above the ranking, outside it.
| Factor | Weight | Computed from | In Cotati data |
|---|---|---|---|
| Reputation | 25% | Google star rating, adjusted for how many reviews back it | Measured |
| Credentials | 15% | Active state license, bond and workers’ comp on file | Not yet collected |
| Review volume | 10% | Number of Google reviews, compared with the most-reviewed business on the list | Measured |
| Recency | 5% | Share of reviews from the last 12 months | Not yet collected |
| Availability | 5% | Weekly open hours, Saturday, Sunday, 24/7 or same-day | Measured |
| Trade focus | 10% | How clearly the business does this trade (its Google category and name) | Measured |
| Proximity | 5% | Based in the city scores highest, less the farther away it is | Measured |
| Claimed profile | 10% | The business has claimed its ContractorsRanked profile (free or paid earn the same) | Measured |
| Partnered | 5% | The business links to ContractorsRanked from its own website with our badge, checked periodically | Measured |
| ContractorsRanked reviews | 10% | Verified customer reviews collected by ContractorsRanked: their rating and how many there are | Measured |