162 solar installers ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →
Best overall in Hamilton Worcester: Boundless, Inc., CR Score 86/100; 4.8★ from 464 Google reviews; open 7 days a week.
Best for emergencies (open 24/7): Old Glory Solar, posts 24/7 hours; ranked #2 of 162.
Most-reviewed: Sunrun Solar, 476 Google reviews at 4.5★, the most of 162 ranked; ranked #13.
Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank
162 Hamilton Worcester solar installers are ranked here by CR Score, from 8 published factors. 20 are open 24/7, 93 open Saturdays and 43 open Sundays, based on posted hours. The median Google rating is 4.9★ across 162 rated businesses.
| Rank | Business | CR Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | Boundless, Inc. | 86 | 4.8★ (464) | Marlborough, 11 mi away | Sat · Sun | Overall |
| 2 | Old Glory Solar | 84 | 5.0★ (30) | Athol, 25 mi away | 24/7 | Emergencies |
| 3 | Team Sunshine Construction, LLC. | 84 | 4.7★ (181) | Boston, 37 mi away | 24/7 | — |
| 4 | Mark The Solar Expert | 83 | 4.9★ (35) | Grafton, 12 mi away | Sat · Sun · Evenings | — |
| 5 | NEC Electric & Solar | 83 | 5.0★ (115) | Needham, 27 mi away | 24/7 | — |
| 6 | Golden Group Roofing & Solar | 83 | 4.9★ (174) | Grafton, 7 mi away | Sat · Sun | — |
| 7 | On Call Electric | 82 | 5.0★ (164) | Marlborough, 12 mi away | 24/7 | — |
| 8 | Sunrun Solar | 82 | 4.1★ (239) | Shrewsbury, 4 mi away | Sat · Sun | — |
| 9 | Shamrock Well and Pump LLC | 81 | 4.9★ (354) | Cumberland, 28 mi away | 24/7 | — |
| 10 | OneGrid Energy Integration | 80 | 5.0★ (57) | Providence, 35 mi away | Sat · Sun · Evenings | — |
Ordered by CR Score, a 0–100 score from 8 published factors. Paid placement never changes the order.
Scores below: based on 6 of 8 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: 4.8★ from 464 Google reviews, listed on Google as “Solar energy company”.
Based in Athol, 25 mi away
Ranked #2 because of its Google rating and availability: 5.0★ from 30 Google reviews, open 24/7.
Based in Boston, 37 mi away
Ranked #3 because of its Google rating and availability: 4.7★ from 181 Google reviews, open 24/7.
Based in Grafton, 12 mi away
Ranked #4 because of its Google rating and trade focus: 4.9★ from 35 Google reviews, listed on Google as “Solar energy company”.
Based in Needham, 27 mi away
Ranked #5 because of its Google rating and availability: 5.0★ from 115 Google reviews, open 24/7.
Based in Grafton, 7 mi away
Ranked #6 because of its Google rating and availability: 4.9★ from 174 Google reviews, open 7 days a week.
Based in Marlborough, 12 mi away
Ranked #7 because of its Google rating and availability: 5.0★ from 164 Google reviews, open 24/7.
Based in Shrewsbury, 4 mi away
Ranked #8 because of its Google rating and trade focus: 4.1★ from 239 Google reviews, listed on Google as “Solar energy company”.
Based in Cumberland, 28 mi away
Ranked #9 because of its Google rating and availability: 4.9★ from 354 Google reviews, open 24/7.
Based in Providence, 35 mi away
Ranked #10 because of its Google rating and trade focus: 5.0★ from 57 Google reviews, listed on Google as “Solar energy company”.
Based in Providence, 36 mi away
Ranked #11 because of its Google rating and availability: 5.0★ from 254 Google reviews, open 24/7.
Based in Ashburnham, 22 mi away
Ranked #12 because of its Google rating and trade focus: 4.9★ from 18 Google reviews, listed on Google as “Solar energy company”.
Based in Taunton, 39 mi away
Ranked #13 because of its Google rating and trade focus: 4.5★ from 476 Google reviews, listed on Google as “Solar energy company”.
Based in Marlborough, 10 mi away
Ranked #14 because of its Google rating and trade focus: 4.0★ from 198 Google reviews, listed on Google as “Solar energy company”.
Based in Billerica, 33 mi away
Ranked #15 because of its Google rating and trade focus: 4.4★ from 276 Google reviews, listed on Google as “Solar energy company”.
Based in Stoughton, 36 mi away
Ranked #16 because of its Google rating and availability: 5.0★ from 139 Google reviews, open 24/7.
Based in Johnston, 34 mi away
Ranked #17 because of its Google rating and availability: 4.8★ from 283 Google reviews, open 24/7.
Based in Warwick, 39 mi away
Ranked #18 because of its Google rating and availability: 5.0★ from 197 Google reviews, open 24/7.
Based in Boston, 37 mi away
Ranked #19 because of its Google rating and availability: 5.0★ from 5 Google reviews, open 24/7.
Based in Medford, 36 mi away
Ranked #20 because of its Google rating and availability: 5.0★ from 123 Google reviews, open 24/7.
Based in Worcester, 2 mi away
Ranked #21 because of its Google rating and trade focus: 4.7★ from 100 Google reviews, listed on Google as “Solar energy company”.
Based in Sterling, 13 mi away
Ranked #22 because of its Google rating and trade focus: 4.6★ from 9 Google reviews, listed on Google as “Solar energy system service”.
Based in Clinton, 16 mi away
Ranked #23 because of its Google rating and trade focus: 5.0★ from 27 Google reviews, listed on Google as “Solar energy company”.
Based in Pawtucket, 33 mi away
Ranked #24 because of its Google rating and trade focus: 5.0★ from 18 Google reviews, listed on Google as “Solar energy company”.
Based in Leominster, 19 mi away
Ranked #25 because of its Google rating and trade focus: 5.0★ from 5 Google reviews, listed on Google as “Solar energy company”.
Typical prices in USD, adjusted for Massachusetts 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 162 Hamilton Worcester 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 Hamilton Worcester 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 |