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Top-Rated Solar panel pros in Williamstown - Updated Nov 2026

Avatar for ReVision Energy
ReVision Energy
4.9(
134
)
Solar Panel InstallSolar Panels For Electric System - Install - For BusinessSolar Panels For Electric System - Repair+1 more

Serving Williamstown, MA and surrounding areas

Approved

In business since 2009

Free estimates

Warranties offered

"Solar panel installation on roof of home went very well. Scheduled in May, install occurred in mid-August. SunBug was not the cheapest option, but very professional & prompt in communicating the details and coordinating the necessary paperwork with the electrical company. The installers worked quickly and did a fantastic job. I was nervous about having them work with the electrical system in a new home, but they were able to integrate with the circuit breaker with no issues and worked with me to make the necessary installed equipment (switch, meter, conduit down to roof, inverter, etc...) as unobtrusive as possible. We had a small wrinkle with their ability to install on a low-pitch dormer, but it was resolved after about a day, and I couldn't be happier with the quality of the work. Solar panels are generating about as much power as advertised, and though it has only been a few months there have been no hardware issues so far."
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+29

Response time8 hrs
Response rate100%
2 neighbors recently requested a quote
Avatar for Tesla, Inc
Tesla, Inc
New to Angi
Solar Panel Install

Serving Williamstown, MA and surrounding areas

Approved (Corporate)

In business since 2015

Free estimates

Warranties offered

Tesla Energy provides an all‑in‑one solar‑plus‑storage solution for your home. Sleek, high‑efficiency solar panels paired with Powerwall help you save on electricity bills and protect your homes from outages. The Tesla app gives you real-time visibility into your energy production, usage and savings—and lets you earn money by supporting the grid through Tesla's Virtual Power Plant. Every system is engineered and installed end‑to‑end by Tesla, delivering a modern aesthetic and the confidence that your home is powered by the most advanced renewable energy ecosystem. With our Price Match Guarantee and exclusive incentives, you can be confident you're getting the best value in home energy.

California Home I
California Home I
California Home I
Texas Home
Texas Home

+3

Avatar for All Energy Solar, Inc.
All Energy Solar, Inc.
4.8(
6
)
Solar Panel InstallSolar Panels For Electric System - Install - For Business

Serving Williamstown, MA and surrounding areas

In business since 2009

Free estimates

Warranties offered

"It was pleasure to work with the All Energy Solar team for the design, installation and post installation support of my home solar power system. Every aspect of my relationship with AES was professional, supportive and actually fun. Working with Justin Growel on initial design was smooth and informative. My project manager, Carlo Maloni, provided excellent support before, during and after installation to ensure that the whole process went smoothly, including all necessary permits and inspections with local government and our power utility. I can't say enough about the excellent installation crew who were total professionals as well as friendly and answered any questions that I had during the installation process that only took a few days. I will definitely recommend All Energy Solar to other home owners looking to install a home solar system!!"
Solar Roof Mount
Solar Pergola Mount
Solar Roof Mount
Solar Roof Mount
Solar Roof Mount

+21

Response time1 day
Response rate86%
Recommended by100%of homeowners
Avatar for SunPower
SunPower
4.2(
105
)
Solar Panel Install

Serving Williamstown, MA and surrounding areas

In business since 1985

Free estimates

"I initially had reservations about the concept of installing solar panels, but I was keen on getting an estimate and seeking professional advice. That's when I met Arvin. He provided me with a comprehensive walkthrough, clearly outlining the advantages of having solar panels. The entire process was straightforward, with each step being well-explained, leaving no room for surprises or unexpected outcomes. Now, a little over 5 months since the installation, I'm enjoying the benefits just as he promised. I want to extend my gratitude to Arvin for his professionalism and responsiveness. He was always there to address any questions I had, both during and after the installation process. Thank you, Arvin!"
Coastal SunPower Solar Installation
West Coast SunPower Solar Installation
NorthEastern Solar Installation
Southern Solar Installation
SunVault™ Storage Helps Keep the Lights On

+3

Recommended by84%of homeowners
Anthony Berry Electrician
4.3(
50
)
Solar Panel InstallSolar Panels For Electric System - Install - For BusinessSolar Panels For Electric System - Repair+1 more

Serving Williamstown, MA and surrounding areas

In business since 2004

Credit card accepted

"It was okay. I think I spent an additional $600. I liked their crew, the owner himself Anthony Berry and he had a person with him. I thought the work that they did was very well done. They cleaned up after themselves. What I didn't like was the fact that they didn't have the supplies that I needed in order to get the job done and then one of them had to leave 3 hours and go get supplies. I was paying for that whole time so it was a little disappointing to me that what I thought could have gotten done fairly reasonably quickly ended up taking a lot longer. My interaction with them and their work were good. I think they should have called me ahead of time and I would have told them what work I wanted done so they could have been more prepared. I felt that they were a little bit unprepared for what I needed done so they just need to be more prepared in terms of having their supplies and stuff. I will not use them again simply because he's actually located very far away like I'm at the very edge of his service area. He's located an hour away and there are other providers with closer proximity to me."
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+1

Recommended by92%of homeowners
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Solar Panels FAQs, answered by experts

While you can minimally overshoot the number of solar panels you need for your home, it's not smart to go too far. Not only is the extra cost unnecessary, but your state may put caps on how much energy your home can produce and send back to the grid. It is always best to work with a solar energy professional to determine the best system size for you.

In almost every case, solar panels need to be removed to replace roof shingles. In some cases, such as solar installations where the panels are on raised platforms above the roof surface, installers may be able to install new shingles without removing the solar installation. However, to get a quality roofing installation, panels need to come off. Most roofing contractors won’t remove or reinstall solar panels as part of a roofing project, so you’ll need to contact your solar provider.

Professionals use the same methods to install solar shingles that they do for asphalt shingles, so you’ll often see a similar installation timeline of one to two days. The amount of time required will depend on the size and slope of your roof and the number of shingles installed. Weather conditions can delay installation, as working on a roof is unsafe during high winds or heavy rain.

The average homeowner needs around 22 solar panels, but the exact number depends on your monthly energy consumption. Your solar professional should size your array to offset your consumption, meaning you’ll need fewer panels if you use below-average amounts of electricity, or more than 22 if you use above-average amounts of electricity. The number of panels also depends on the output of each panel. The average is around 400 watts, but you might need more panels if you install less capable equipment. Since there are so many variables, you should have a professional size your system.

A few disadvantages of installing solar panels on your roof include the high up-front costs and the potential for increased property taxes. Installing solar panels can increase the home’s value, which in turn can mean higher taxes. Depending on your area, you should check with your local tax offices for more information. Another potential pitfall is roof leaks from a poor installation, but this shouldn’t be an issue if you hire a reputable company.

The Williamstown, MA homeowners’ guide to solar panel services

From average costs to expert advice, get all the answers you need to get your job done.