Modern, space-saving ADUs crafted for Bay Area living – combining style, comfort, and functionality to enhance your property and lifestyle.
At ADU San Mateo, we combine architectural insight, construction experience, and deep knowledge of Bay Area zoning laws to deliver high quality accessory dwelling units from design through move in. Our mission is simple: to make building your ADU clear, fast, and stress free.
Real ground-up ADUs we've designed and built across the Bay Area. No prefab, no shortcuts.
Hillcrest, CA
A ground-up Spanish-revival detached ADU with hand-troweled white stucco, a clay-tile roof, arched entry, and a hand-set Moroccan tile niche, opening to a beamed, barrel-vaulted interior with walnut cabinetry and waterfall quartz.
Silvia, CA
A completed detached ADU in Silvia with a shaker kitchen with quartz counters and a tile backsplash, a fully tiled bath, mini-split climate control, and sliding glass doors onto the lawn.
Seamless ADU design and construction backed by transparent communication, local expertise, and licensed professionals.
We assess your goals and property to determine the best ADU plan.
Our team develops detailed plans and aligns design with your budget.
We handle all city approvals to keep your project moving smoothly.
Our builders bring your ADU to life with quality and precision.
We finish interiors and deliver your ADU ready for move-in.
Elie AlChaer
Founder & Licensed General Contractor
Elie AlChaer is the founder of ADU San Mateo. He spent his career delivering over $2 billion in commercial and luxury construction across the Bay Area and Dubai, and is a licensed California general contractor.
He started ADU San Mateo after watching too many homeowners hire cheap and pay for it twice: blown timelines, rework, budgets that unravel. His answer was to study the entire ADU process end to end and break it into phases, so you only commit to what moves your project forward, one step at a time.
Real reviews from Bay Area homeowners we’ve built for.
“I am so happy to find ADU San Mateo. The crew are nice, professional, doing a great job while pay attention to details, all with a good price. Highly recommend!”
“Finished work in a timely fashion. Quick to respond.”
“Excellent service highly recommended”
“ADU San Mateo went above and beyond our expectations. They were with us every step of the project, making the experience easy and headache free. ADU San Mateo has great attention to detail and abundance of carpentry knowledge. They always answered our calls and ensured the job site was clean and safe before ending the workday. The team was very professional, clean, and respectful. We contracted ADU San Mateo to build our ADU unit and cannot be happier with the outcome. Would definitely recommend to anyone looking for cost-effective get it right the first time company. Definitely would use for our future projects.”
“Dependable, responsive, quality workmanship and dedication to getting the project completed timely and on or under budget. They treated our home as if it was their own. The outcome exceeded my expectations. Would recommend to my friends and family.”
“I would highly recommend ADU San Mateo to all my friends and family. The crew is efficient, polite and hardworking. They are easy to work with and very competitive with pricing. We would definitely recommend and hire again for future projects.”
“Such exceptional work done, I am beyond pleased with the results! Paid close attention to detail and I was always kept informed. High quality work and excellent service gave us the results we expected. I was completely impressed with their professionalism and customer service. I highly recommend this business!”
“I HIGHLY recommend Eli and his team for any home remodeling projects. They did my staircase and completely did what I have envisioned. I am a perfectionist, so I am glad I met them. They are very detailed oriented, very punctual, and there were no delays. He advised me what’s the best route, up to code, and provided recommendations tweaks on my design. I provided a 3D rough draft sketch to them, the measurements were 100% accurate. I can guarantee you that you won’t be disappointed, as I went through roughly 10 contractors and FINALLY found the right team. I am looking forward to seeing how my kitchen tiles turn out.”
“They were responsive and efficient and easy to work with.”
Free feasibility review, no obligation consultation, response within 1 business day.
(650) 200-2040 · Monday to Friday 8AM-6PM
