Commercial roofers you can count on.

Got Leaks? Don’t stress. Call ACS. (925) 548-9748

Roof ready for the rain? Request your free maintenance inspection » 

Screened HomeAdvisor Pro - Allied Construction Services

Need a reliable roofer?  ACS services HOAs, apartment complexes, commercial and industrial buildings. We have more than 20 years experience and are the second-largest veteran-owned business in the Bay Area

Contractors make you nervous? Our professionals will set your mind at ease.

What if something goes wrong? We’ll do our best to make sure it doesn’t. If it does, we’ll fix it.

Don’t delay. Call us today at (925) 548-9748 !


Our service area includes San JoseSan FranciscoOaklandSanta RosaSacramento, and Stockton.

ACS President Interview on KTVU 2

Jason Rittenbach was interviewed for Veteran’s Day 2020. He spoke about how his time in the Marines helped him build the second largest veteran owned business in the Bay Area.

Don’t Replace, If You Can Restore.

Don’t tear off your existing roof. Save money and extend its life by 15-20 years with a polyester reinforced coating.

A Licensed and Certified Commercial
Roofing and General Contractor

Serving Northern California
For Over 20 Years

We follow state and county COVID-19 guidelines to ensure your safety. More »

What Solution is Best for You?

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TPO Roofing

TPO is on 1/2 of all commercial roofs. Find out if this popular choice is right for you »

PVC Roofs

The Cadillac of roofs, PVC is fire retardant and self-extinguishing. Learn more »

Roofing Highlight Videos

C&H Sugar Factory Sign and Brick Building with Two Silos

C&H had a sticky problem nobody wanted to fix. So we did.  View video »

Tice Valley Gymnasium added 15 years to their roof life with a silicone roof coating, and saved big. View video »

Walnut Creek City Hall Roof with solar panels

Roofs are boring, right? We think we can surprise you.  View video »

Recent Blog Entries

Commercial Construction Projects

We offer a full suite of commercial construction services. Learn more »

Office Tenant

ADA Compliant Construction

Shell Improvements

Premier Commercial Roofing Solutions You Can Trust

Our men installing two medium-sized TPO single ply roofs.

For two decades, we’ve built our reputation as one of the premier commercial roofing companies in Northern California with:

Transparent Quotes

We value your time, so we provide quick, comprehensive, hassle-free quotes, at no charge. Got questions? We’re happy to answer them.

Professional Craftsmanship

We do high-quality work on time and on budget. Our certified team is up to date on the latest and greatest processes, tools, and methods to ensure you receive the best possible installation or repairs. 

Friendly Customer Service

Our customers come first. We actively listen to your needs because your satisfaction is the key to our success. We treat you with respect, maintaining clean job sites, answering questions, and doing our best to exceed your expectations.

Value Engineering

We love to think outside of the box if your project presents a unique challenge.

The Highest Quality Materials

We only use reputable, high-quality materials, but they are only as good as the people installing them. That’s why we regularly inspect our jobs to make sure no details are left unfinished.

Need a high-quality roofing company you can depend on?
Call us at (925) 548-9748 for more information.

Customer Testimonials

"My company has relied on ACS as a valued resource for roofing and waterproofing for some years now. [...] Timely and comprehensive proposals. Competitive pricing. Workable scheduling. Efficient and courteous workforce. Knowledgeable and experienced sales, management and office staff. Work product of the highest quality. [...] We look no further than ACS for our Roofing and Waterproofing needs. Highly recommend.""
Tom Hastings
Business Owner
Bill D[...] always put the customers first always willing to go beyond the normal to assist us."
Lawrence Stauffer
Building Owner
"The best company we have worked with for our roofing needs. Mousa, who heads their crews, is one of the most professional and competent employee a company could want. When his crews were booked and couldn't get out to us immediately, he personally took care of us. This company has great employees and we will continue to use them for all our construction needs. We highly recommend them."
Business Owner, Trey Jay LLC
"The foreman had the greatest attitude. He went above and beyond."
Christophe Nussbaumer
Operations Manager, City Hope