11 solar installers ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →
Best overall in Williston: Green Mountain Solar, CR Score 85/100; 5.0★ from 283 Google reviews.
Most-reviewed: SunCommon, 266 Google reviews at 4.6★, the most of 11 ranked after Green Mountain Solar; ranked #3.
Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank
11 Williston solar installers are ranked here by CR Score, from 8 published factors. 3 open Saturdays and 3 open Sundays, based on posted hours. The median Google rating is 4.5★ across 11 rated businesses.
| Rank | Business | CR Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | Green Mountain Solar | 85 | 5.0★ (283) | South Burlington, 5 mi away | — | Overall |
| 2 | Sunrun Solar | 84 | 4.1★ (112) | Essex Junction, 4 mi away | Sat · Sun | — |
| 3 | SunCommon | 80 | 4.6★ (266) | Colchester, 16 mi away | — | Most reviews |
| 4 | Building Energy | 77 | 4.4★ (42) | Williston | — | — |
| 5 | Albany Solar Solutions | 76 | 5.0★ (5) | North Elba, 27 mi away | — | — |
| 6 | Bullrock Energy Ventures | 72 | 5.0★ (3) | South Burlington, 4 mi away | — | — |
| 7 | Encore Renewable Energy | 71 | 4.0★ (4) | Burlington, 8 mi away | — | — |
| 8 | Breiter Planet Properties | 70 | 1.6★ (13) | Dighton, 35 mi away | Sat · Sun · Evenings | — |
| 9 | Hellbrook Solar | 67 | 5.0★ (5) | Colchester, 18 mi away | — | — |
| 10 | MAD Services | 66 | 4.3★ (4) | Plattsburgh, 39 mi away | Sat · Sun · Evenings | — |
Ordered by CR Score, a 0–100 score from 8 published factors. Paid placement never changes the order.
Ranked #1 because of its Google rating and review volume: 5.0★ from 283 Google reviews, the most Google reviews on this list (283).
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Essex Junction, 4 mi away
Ranked #2 because of its Google rating and trade focus: 4.1★ from 112 Google reviews, listed on Google as “Solar energy company”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Colchester, 16 mi away
Ranked #3 because of its Google rating and trade focus: 4.6★ from 266 Google reviews, listed on Google as “Solar energy company”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Williston
Ranked #4 because of its Google rating and trade focus: 4.4★ from 42 Google reviews, listed on Google as “Solar energy system service”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in North Elba, 27 mi away
Ranked #5 because of its Google rating and trade focus: 5.0★ from 5 Google reviews, listed on Google as “Solar energy system service”.
Based on 5 of 8 factors; credentials, recency and availability not yet collected.
Based in South Burlington, 4 mi away
Ranked #6 because of its Google rating and trade focus: 5.0★ from 3 Google reviews, listed on Google as “Solar energy company”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Burlington, 8 mi away
Ranked #7 because of its Google rating and trade focus: 4.0★ from 4 Google reviews, listed on Google as “Solar energy company”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Dighton, 35 mi away
Ranked #8 because of its Google rating and trade focus: 1.6★ from 13 Google reviews, listed on Google as “Solar energy company”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Colchester, 18 mi away
Ranked #9 because of its Google rating and trade focus: 5.0★ from 5 Google reviews, listed on Google as “Solar energy equipment supplier”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Plattsburgh, 39 mi away
Ranked #10 because of its Google rating and availability: 4.3★ from 4 Google reviews, open 7 days a week.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Middlebury (village), 29 mi away
Ranked #11 because of its Google rating and trade focus: 4.5★ from 8 Google reviews, listed on Google as “Air conditioning contractor”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Typical prices in USD, adjusted for Vermont with a published regional index. Each row names its basis and month.
| Job | Low | Typical | High | Basis | Checked |
|---|---|---|---|---|---|
| Solar panel installation | $28,990 | $32,790 | $35,670 | Per system: about 12 kW at about $2.60 per watt, before incentives. US national range × 1.05 New England factor (2025 Cost vs. Value Report) | October 2026 |
We scored 11 Williston solar installers on 8 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. Unknown factors are left out of the score, 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 Williston data |
|---|---|---|---|
| Reputation | 35% | Bayesian-adjusted Google star rating | Measured |
| Credentials | 15% | Active state license 0.6, bond 0.2, workers’ comp 0.2 | Not yet collected |
| Review volume | 10% | log10(reviews + 1) against the list maximum | Measured |
| Recency | 10% | Share of reviews from the last 12 months | Not yet collected |
| Availability | 10% | Weekly open hours, Saturday, Sunday, 24/7 or same-day | Measured |
| Trade focus | 10% | Google main category 1.0, business name 0.7, additional category 0.5 | Measured |
| Proximity | 5% | 1.0 when based in the city, falling to 0 at the trade’s radius | Measured |
| Completeness | 5% | Website, photos, description, hours, claimed profile (0.2 each) | Measured |