Bay Valley Roofing & Solar
Company Overview
If you need roof and solar replacement or repair services, you shouldn't just call any contractor. Look for a contractor with a solid history of assisting local homeowners. You want someone reliable who will arrive and perform the job with utmost skill. If this describes the company you need, get in touch with Bay Valley Roofing. We proudly offer our top-notch services in Contra Costa, Alameda, and Solano counties.
Raul Diaz found his dedication to quality work at an early age. He noticed the demand for committed and enthusiastic individuals to assist homeowners and businesses in turning their visions into reality. By 1989, he had started a continuous journey toward perfection and ensuring client satisfaction. While his life evolved, the family commitment to quality was passed down to his children. Ryan Diaz, one of Raul's sons, started working with him when he was just 12. Alongside his father, Ryan learned from Raul's dedication and hard work, gaining invaluable experience.
“Certain homeowners like to handle some tasks on their own, either because they have the skills or want to cut costs,” they note. “We are the sole company that presents three different options to accommodate various project types. “We can oversee the complete design and construction process, or we can handle certain elements and allow the homeowner to take charge of the rest.”
Raul and Ryan Diaz prioritize giving clients the freedom to select the level of construction services they require. Some homeowners opt to handle parts of the work themselves, either from experience or to save a considerable amount of money, they explain. We are the only company that offers three different plans to accommodate any type of project. We can either manage the complete design and build process or take care of specific components while the homeowner finishes the rest.
At Bay Valley Roofing, we prioritize customer service in all aspects of our work. Building trust with our customers is our primary goal, and the most effective way to do that is by showing our dedication to quality service, says Raul Diaz. From providing daily project updates to offering completion timelines, we strive to keep them involved in the process as much as possible.
Business Services
- Roof cleaning
- New roof installation
- Roof repair
- Roof replacement
- Reroofing
- Add solar shingles on roof
- Solar system installation
- Solar shingle installation
Business Location & Hours
Mon: | 7:30 AM - 5:00 PM |
Tue: | 7:30 AM - 5:00 PM |
Wed: | 7:30 AM - 5:00 PM |
Thu: | 7:30 AM - 5:00 PM |
Fri: | 7:30 AM - 5:00 PM |
Sat: | Closed |
Sun: | Closed |
Recommended Customer Reviews

After the major storm we had a few weeks ago our roof leaked. I called Bay Valley Contractors and they came out quickly Dean determined the problem gave me a clear and detailed explanation of the problem and what needed to be done to fix it. They were able to get the work scheduled within 2 weeks. the crew showed up everyday on time or early and worked very hard all day and cleaned up everyday before they left. The project took three days to complete. Raul the project manager showed me pictures of everything that was going on and explained everything to me. I felt the work and done with care and thoroughness and the price very fair.
I highly recommend them

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.

I hired Bay Valley to replace my roof because they were professional and prepared. When what I thought was a pretty standard roof job got complicated, Jose, Raul, Dean and team never blinked. They made it clear that my satisfaction with the work was all that mattered. They worked out a creative solution. They delivered on their promise. Great team of pros, and great work. Thanks.

I had a bad experience with this company. It seem that they don't like to take on small jobs or particular challenging jobs or know what they can or can't do. I had call them to set up an appointment with the company to do a squirrel exclusion on my roof returns. Right off the bat I asked their rep if this is something they can do, they could of said ""no, this is not something we do."" But the rep insisted that this is something their roofer can fix so I setup an appointment. The roofer came to my house, took a look at my roofer and said my roof was too steep and he can't do anything. What a lazy excuse what a waste of everyone's time. Do roofers in this company not research the house from google earth with the address before they come? Are your reps not trained on what your roofer can or cannot do. Needless to say I won't be using this company for anything and I will actively recommend people in my social circle to avoid this company.

unfortunately we did not have a good experience from bay valley contractors. back in july/august they were to replace our roof and install solar panels which we were told would take 2weeks for permits and everything. we however did not get the roof completely done until december. This left our roof started and unfinished for months. This was also during the fire months and there was no way for us to completely seal up the house to have clean air when the aqi was at hazardous levels. The roof did not have shingles either at the time which put us a higher risk of ignition if a fire had found its way over to us. During this period, we were told that they were waiting on permits, workers had gotten sick, and there were multiple times when someone was supposed to come out to work on the roof and didnt. I contacted the county to see the status of the permit and was told that it had already been approved meaning that there was miscommunication within the contractor group. It was very disappointing and frustrating to endure this process and i know it is not at the fault of the workers or contractors but the higher bureaucratic entities. Overall we had chosen to go with BVC even though it was more pricy because we were promised that it could be done quickly. Lastly, they did not clean up their mess as promised and left us with a deck covered in roofing materials along with some stray plastic bottles littered in the yard. For the price we had paid and the impact the business had on our everyday life for months, i cannot in good faith recommended this company.
Although the review on the company is overall negative, i would like to mention that every person i was able to talk to who was working had been extremely professional, courteous, and equally as frustrated that the job could not be finished for whatever reason. The issue was NOT with the workers but with the communication within the city, county, and company

Getting a roof replaced is like going to the dentist; you know you have to do it, but you really don't want to deal with the pain. Things get even worse when your old roof is leaking onto your new hardwood flooring. I spent months going though all the usual problems dealing with unresponsive roofing contractors, etc. I kept thinking if I'm having this much trouble now, what is it going to be like if I have a problem after the work is done. Dealing with Bay Valley was just the opposite; they have great customer service. My situation was compounded by the fact that I had an older solar installation, which obviously needed to be removed. Ultimately, rather than reinstall it, I ended up replacing it with a new GAF system installed by Bay Valley, which avoided possible installation issues. As expected, dry rot repairs were needed as a result of the previous roof not being installed correctly. The dry rot repairs, the new roof, and the solar installation was done very quickly and professionally. As other reviewers have mentioned, they are not the cheapest, but I am confident the job was done right, and they will be there if follow up service is needed.

We had them replace our roof. They were not the cheapest bid we received, but we were very impressed by their quality product and 50 year guarantee. Everyone we worked with was very professional. We had no conflicts and necessary change orders were clearly explained and priced fairly. The job was completed in a reasonable time frame. We were really impressed with their clean-up ethic. We definitely recommend Bay Valley Contractors for roof work.

I was looking to replace my old wood shingle roof, so I contacted about 6 companies to come out and give me estimates. The prices varied widely. Most could either not warranty their workmanship or could only do so for a year or two. They did not go into detail as to how the process would proceed and the type of materials they would use. I chose Bay Valley Contractors because they were the only company that explained exactly what they did and why and they offered the best warranty, which was 50 years on the materials and 25 years on the labor. They also had a great selection to choose from in different price ranges, all with the same great warranty.
They only use GAF roofing shingles and products and their workers are specifically trained on how to install them and must go through ongoing training to ensure proper installation and certification, because of this even if they went out of business in 10 years I do not loose my labor warranty because their workers are certified through GAF. All shingles are also up to code for California requirements, Title 24. They are also a Diamond certified company, which is important to me. I have a large roof and they completed the job in 3 days! They were very professional, cleaned up nicely each day and it passed inspection without a hiccup! Most of all it looks beautiful and is well done!!! I am very happy with my new roof!!!

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.

Previously 2 years ago had this company reroof my house - wonderful quality and workmanship, fair price, totally reliable.
Forgot to replace old skylight so had them come back, very fast inspection and estimate, crew came out within a few days, on time, did an excellent job, left things clean. And I know they'll stand behind their work.
The best part, aside from the quality job, is the peace of mind knowing these guys know what they're doing and you won't get some ugly suprise a year or two down the road (you known, when that particularly heavy storm hits)