Call 760 591 4570


We at Modern Builders Supply pride ourselves on having expert customer service. Do not hesitate to call or email any inquiries you might have. Our knowledgable masonry staff will be there to answer your questions and keep your project on track.

Modern Builders Supply
825 Grand Avenue
San Marcos, CA 92078
Monday – Friday: 7 am – 5 pm
Saturday: 7 am – 1 pm
Sunday: Closed
Phone: 760.591.4570
Email: Customer Service