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    Bay Valley Roofing & Solar

    4.2 (67 reviews)
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    Enjoying our finished room!

    When it comes to picking a construction company it boils down to two questions really. What is the quality of their work? Are they fair and responsive to customers? Bay Valley earns five stars from us on both accounts for the job they completed at our house. Here is why... We accepted the bid from Mr. Raul Diaz because we appreciated his candid, transparent communication about costs. We had been warned that construction companies often execute multiple surprise change orders to increase their profits throughout a job, but this never happened with Bay Valley. The one increase in cost that was unexpected was understandable and due to observable issues with our electric system infrastructure. As Mr. Diaz had initially promised, we stayed on budget throughout the job. The quality of a company's work is the end result of many small choices. We were both present during the entire job. We watched each step of the way and saw that all of the lines were perfectly straight, and everything was made perfectly level at each step of the way. One of Bay Valley's greatest assets is a finisher who does meticulous work. He came in to put the finishing touches on the flooring, every single door, the molding around the doors, the aprons for the windows, and the finishes for the bathroom - all done perfectly. Bay Valley also worked with subcontractors who held similarly high standards - Baltodanos for texture and taping of drywall and S.Y. Electric were both top shelf companies that did excellent work. In the end everything was done beautifully. We are 100 percent satisfied with how everything turned out. Also, this is important, because living in a house throughout a major construction job is an inherently stressful process. Never once did we witness any argument between anybody on the crew or with any of the subcontractors. Everybody worked cooperatively together with capable leadership and helpful communication from John Piermattei. Mr. Piermattei was wonderful to work with throughout the process. He was fair minded and a great communicator. For example, he warned us that there would be a lot of dust and then put up several high-quality dust shields that prevented nearly any dust from getting into the rest of our house. I noticed that the entire crew was really professional in the small things as well. For example, the worksite was always kept clean and organized. They never left over a weekend without putting their tools in a corner of the room in a neat and organized way and sweeping out the room. Every job will have a setback or two - this we accept as inevitable. Like any other job, this happened during the process. Here's why I mention this - you cannot know how a given company will actually treat you until you have a setback. The way that Bay Valley handled these setbacks was evidence to me that this company is dedicated to being decent, fair and reasonable with its customers. They communicated clearly with us and resolved each of the two setbacks in a way that left us feeling respected and treated fairly. Our understanding is that Bay Valley is transitioning to becoming the Bay Area's Premier roofing company. They will now be working on installing solar panels that are part of roofing systems in affiliation with a high-quality product made by GAF. We feel very fortunate to have been able to work with them before they made this transition. They made a beautiful room extension for us. If future customers have roofing needs or want to install these kinds of solar systems, we highly recommend Bay Valley as a company that is run with integrity and very high standards. 5 stars from us!

    Rafi R.

    We just finished our home's expansion (a very complicated project) done by Bay Valley Contractor's back in July. This was a not that so easy project. Both Bay valley contractors management and their staff member did a great job with excellent result. First of all they treated our home as their own home and were cleaning after themselves every day they finished their work even we didn't lived there during the construction. They were on top of things the whole time during the planing , permitting and construction process. It was a pleasure working with Both Raul (owner) and John (Manager, Forman) the entire time. Looking forward to work with them on the next project and enjoying some return costumers discounts from them.

    Photo taken a week after the roof replacement completed
    Michelle L.

    We've hired Bay Valley contractors for a couple of roofs. We had good experience in the past however when we hired them for a roof replacement this April they did a sloppy job. - Ugly stucco patch. A couple of neighbors even came to tell me that "your roofer did a terrible job with your wall, are you going to repaint?" - When they took down the old gutter a bit of wall damage occurred. They should have painted the exposed stucco before adding the new gutter but they didn't. Now it's very hard for us to paint the stucco to avoid water damage without taking those gutters down! - They left a huge mess in our attic. I didn't know about it because they picked up in the yard. When my electrician told me that our attic is covered in roofing debris I couldn't even believe it. He said the roofer should have protected it with a tarp and it's unusual that it's left so dirty. I uploaded the photos my electrician took to show me, but it's actually worse than the photos can show. - They also left roof debri in the gutter, which can clog our new gutters - The estimator gave us a verbal estimate on lifting the solar panels (by a third party provider) but never provided us a written contract, until the day before the take down. They called and said the solar take down would be $6000 (in addition to the roof replacement charges) instead of the $3000 that we were told before. With this change we decided to evaluate other options including getting new solar panels. We wanted them to inform us the exact cost of the different sizes of the solar panels in order for us to decide, but they said "You just need to tell me that size of the panel you want. Our workers are ready to start the job and you have to decide now!" without even telling us how much it would cost. We were firm that we are not starting the job unless we know how much will have to pay, and finally an hour later we received the solar contract in the email. The solar part was done by a third party but the estimator of Bay Valley recommended the provider and was supposed to coordinate for us. It could have been much less stressful if he didn't wait until the last day to tell us about the big price change. Although the review on the company is overall negative, i would like to mention that the owner Raul had been extremely professional and courteous as usual. Maybe it's just hard to maintain the quality of the crew with the expansion of business.

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    Page 1 of 2

    Ask the Community - Bay Valley Roofing & Solar

    Review Highlights - Bay Valley Roofing & Solar

    When what I thought was a pretty standard roof job got complicated, Jose, Raul, Dean and team never blinked.

    Mentioned in 20 reviews

    Read more highlights

    Diablo Solar & Electrical Services - Even our youngest solar installation technicians love their job at Diablo Solar!

    Diablo Solar & Electrical Services

    (294 reviews)

    Diablo Solar & Electrical Services put in our pool solar panels in 1999 and they have serviced them…read moresince then. Theses panels have done an incredible job of heating our pool throughout the years, thanks to Diablo Solar maintaining them. Recently we had to replace our roof. Diablo Solar worked closely with us to take the panels off and put them back on right before and right after our roof was replaced. The crew did an amazing job! They were super polite, friendly, knowledgeable, professional and considerate. Zach, Gary and Joe took the panels off. They carefully placed them in our yard and did not damage a single piece. Zach and Julian put the panels back on our roof perfectly. They look beautiful and are again heating our pool flawlessly. They helped to make our roof replacement so much easier and I truly appreciated their hard work. I would highly recommend Diablo Solar Services!

    Update: The services…read moresenior leader called to discuss the issues. He was very polite and professional. He also shared the depth of the challenges with the company that manufactured our panels. We agreed to fix the system by excluding the impacted panels. I offered to pay the one hour of labor that would he have been expected (as I simply wanted to system to work and felt this was fair). They arrived promptly and made the fix. Since then the system has been working fine. I suggested some changes to their customer service model as all of these issues could have been easily avoided. I appreciated his call and rapid response.

    Got Watts Electric Solar & HVAC

    Got Watts Electric Solar & HVAC

    (315 reviews)

    Got Watts installed two phases of solar panels on my roof, 67 panels in total. The job was massive,…read morethe price was fair, and the follow up service was excellent. There were hardware glitches after installation, but the Got Watts team reliably spotted them - without me realizing there was even an issue - and sent teams out to ensure my equipment worked as promised. Years later I noticed some leaks through my roof where some phase 2 panels were installed. I notified Got Watts and they sent large crews to my home to rectify the issue over several days. This was no small fix. They probably spent vastly more to rectify the leaks than they did to install the panels to begin with. No one likes to have problems with an install. But, it means a lot for a contractor to honor their commitment and spend vast sums to honor their warranty, and their word, to their customer. I've had "good companies" make promises they wouldn't honor once the initial check cleared. Got Watts was true to their word and treated me in a dignified manner that is rare these days. I would unreservedly recommend the good people at their firm. Special thanks to Sam Moore and Daniel Harrold for their excellent service.

    Skylar S @Got Watts showed up at my door at just the right time. I needed a new roof and it was the…read moreperfect time to get a solar system installed. He helped me understand the options, pricing/discounts, and process. He helped get estimates from roofers and connected me with TCU for project loans. He answered questions along the way, checked in on the progress and practiced high-quality professional customer service throughout. The system is up and running (after a Tesla battery replacement) and generating power! First bill from PG&E was $38; second was $2! Thank you, Skylar and Got Watts!

    East Bay Power Systems - Beautiful install against the back drop another gorgeous sunset over looking the bay!

    East Bay Power Systems

    (98 reviews)

    Having East Bay Power Systems design install and certify a rooftop solar panel system has been a…read morewonderful experience. Working with the team (Darlene, Jeff, David etc.) to get the system designed and installed was very easy, they took care of everything, including getting the city to approve the design/installation for PG&E. Installation was a simple one day process, and best of all, we were essentially off the grid the next day. Interestingly East Bay Power Systems use American made solar panels (Aptos) and an American made power backup system (Tesla). Not only does the system perform flawlessly, because of there high output of the Aptos solar panels (up to 450W per panel) the whole array of 10 panels is virtually unseen. As an added bonus, they set up a Tesla app on your phone so you can see at a glance how mush power the system is generating, how much is being used to power the house, how much is used to charge the backup system and how much power is being sold to PG&E. For a system this good, overall cost was relatively low, far less than what I was quoted 5 years ago by two different companies. You may have noticed all my reviews to date on Yelp have been 5 star, this is deliberate. Life is too short to focus on that which does not make us happy. This is why I restrict my reviews to those things/places/services that make me happy and appreciate life. Sure, I have been to some really dreadful shops, hotels and restaurants etc., but, like I said, life is too short to spend time thinking and writing about them.

    The product is good, the process left us wanting…read more Eric, David, Jose and the crew did an excellent job. My frustration was with the post installation process. I got answers from Darlene that did not make sense. Sometimes her computer was down other times her phone was down. Sometimes she would call to give me a message only to realize that she had called the wrong customer. Did not enjoy working with her. Finally, Kara engaged and we got the Permission to Operate about two months after the install. Supposedly Jeff (the Business Owner) is no longer with the company and has gone back East, so not sure who is leading their future efforts. For future customers: hang on to a portion of the payment till the Permission to Operate is received not just the installation.

    NorthStar Solar - New Enphase 10C Battery was just released and this is the first one we installed. Very powerful, cutting edge, and compact.

    NorthStar Solar

    (126 reviews)

    Northstar Solar just completed a solar panel installation on my home. The crew was professional and…read morepersonable. The cost was most reasonable compared to the other estimates I received and the end product was perfect in design and installation. This is a very good company. It gets my highest recommendation. Martin E Northstar Solar just completed a solar panel installation on my home. The crew was professional and personable. The cost was most reasonable compared to the other estimates I received and the end product was perfect in design and installation. This is a very good company. It gets my highest recommendation. Martin E

    Wow, I cannot say enough good things about Ryan and his team! I hired them to remove our 69 solar…read morepanels and reinstall them after a re-roofing of our home. It's a nerve wracking process but Ryan gave me reassurance things would go well. Upon Ryan's recommendation, we also decided to replace the solar panel racking system installed by Sunrun because we were plagued with roof leaks due to improper sealing of their footings. Ryan and the Northstar team were absolute champs at removing and reinstalling the new system for us. Everyone we dealt with was so professional, kind and easy going. The work was beautifully done and based on all the photos and detail provided by Ryan I am confident we will be safe from leaks going forward. He also had to coordinate the reinstall with our roofer and everyone handled it so well. I 100% recommend Northstar and the team for this task, and also wouldn't hesitate to hire them for roofing based on their strong work ethic and product with our solar project. The price was fair and in line with other quotes I'd received. A couple of questions unrelated to this particular job have come up and Ryan has gone above and beyond to help me out by providing his professional input. So happy with these guys. Thank you!

    Your Energy Solutions - Livermore comp shingle roof with solar installation.

    Your Energy Solutions

    (614 reviews)

    We could not be more delighted with the results we achieved working with the team at Your Energy…read moreSolutions. The many moving parts to our residential solar plus battery system, including the various entities, such as PG&E, Tesla, City inspectors, and the financial backers we opted to use all progressed seamlessly and, for us effortlessly, thanks to hard working individuals behind the scenes. In particular, Skyler could not have been more helpful, managing our project and acting as a point of contact. Others included David in sales who demystified the process, Varon who coordinated with the utility to ensure we met all requirements, and Gino, who collaborated with Maxwell Power (formerly HDM Renewable Finance), the clean-energy company that helped finance our residential system. On site, the design and install team did a great job keeping things simple. The entire system, including battery and thirteen panels, was installed according to Ramiros's expert design within just four hours. Good quality hardware was used to tie to the roof, which was inspected by our roofer and given a big thumbs up for not causing problems. But even before that, David our site survey tech, gave us the sense that all would proceed well, as he collected necessary data by drone, and made a favorable first impression with his personable approach. Toward the end of the multi-month process, which included time to get a new roof installed, we passed city inspection with YES tech, Dario, an extremely courteous young man, present to ensure we made it through that last step and PTO (permission to operate). YES has an excellent and well-deserved reputation because of these people and others who worked on our behalf. The company can do better automating some of the process, and to be fair, they say they are working on transitioning to a CRM software solution for this purpose. But, I can say that over a period of several months, I had excellent communication with many helpful people. Skyler in customer service was my primary contact and that made all the difference. My thanks to YES for helping us make this wonderful and complex project a reality. We love our new YES-backed system and look forward to working with the company again in the future.

    I had a frustrating experience with Your Energy Solutions regarding a warranty transfer. The…read morecontract stated that an additional charge would be incurred for the warranty transfer but did not disclose the amount. We were later charged $500 with no prior breakdown or explanation of the fee. I clearly communicated that I would be the one paying this charge. Despite that, the service department reached out directly to the buyer and asked who would be paying. This unnecessary contact created confusion and complications during the escrow process that could have easily been avoided. The lack of transparency on the warranty transfer fee and the poor internal communication caused more stress than necessary. Businesses handling real estate-related services should be more careful with both contract clarity and how they communicate with parties involved in a transaction.

    Solar Sesame

    Solar Sesame

    (123 reviews)

    I couldn't be happier with my experience with Solar Sesame…read more My situation was a little more complicated than most because I already had an existing leased solar system under NEM 2 that I wanted to preserve. That meant my new system needed to be designed as a non-export system with battery storage. Before choosing Solar Sesame, I had already received three other quotes. My existing provider kept pushing another leased system where I'd continue paying per use. While it was cheaper than PG&E, it was significantly more expensive over the long run than owning the system myself. Another provider told me they couldn't fit enough panels on my roof to meet my energy needs and recommended much more expensive alternatives. A third provider quoted nearly 40% more than another installer for essentially the same system. Solar Sesame stood out immediately. They designed a system that fit all the panels I needed on my roof, met my energy goals, and came in at the best overall price. They also went above and beyond when the federal tax credit rules were changing. They were able to structure the project in a way that effectively preserved those benefits for me, which I really appreciated. Originally, I planned to install just one Tesla Powerwall. After doing more research, I decided I wanted two. I found a competitive online offer, and without any hassle, Solar Sesame matched it by adding the second battery at a heavily discounted price. That flexibility and willingness to work with me made a big impression. Throughout the entire project, the team was transparent, professional, and kept me informed every step of the way. There were a few delays, but they were all related to the PG&E process rather than Solar Sesame. Now that everything is up and running, I'm extremely happy with the system. The installation looks great, my electric bills have been dramatically reduced, and I feel confident I chose the right company. If you're shopping around for solar, I highly recommend talking with Solar Sesame. They earned my business by offering the best combination of value, expertise, transparency, and customer service.

    Solar Sesame is a brokerage company, they don't install the panels; they work with another company…read morecalled GoodLeap that installs, maintain and owns the solar panels. There is a 3.59% increase annually to a flat rate fee and a connection fee with the quote. After 25 years of this contract, you can choose to buy the panels (by that time, the panels will be 25 years older), but if you'd like to keep the panels, it'll cost a todays estimate of 900-$1200 to maintain annually. When I did the calculations would $327 monthly for electricity. And even with the panels, there is a $15 connectivity fee to connect to the main grid aka PG&E. So the quote I got is unsustainable for what I'm trying to achieve; which is to be independent from PG&E. Because I used only about $30 of electricity and $15 gas, but have to pay $125 delivery fee from PG&E, and it's just gouging for no reason. And the solar sesame quote I got ended up more expensive in the long run than if I stayed with PG&E. I was referred to an actual government run solar panel installation company through a local state and federal program called Grid Alternatives and is looking forward to a quote from them. was told by a clean energy program that I may be able to get solar panels free of charge and get a electric panel upgrade at no charge if I qualify. After meeting with their rep; they were pressuring me to sign at the meeting. Very aggressive. The solar seasame rep said he has been with the company for 10 years; but solar seasame was established in 2021. Maybe I heard this wrong, but there were a lot of questions unanswered; and a lot of confusion on who and what is getting done. They also use the Tesla battery...which I don't want to support. Unfortunately I will not be going with Solar Sesame.

    Bay Valley Roofing & Solar - roofing - Updated September 2026

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