Modern Builders Supply


825 Grand Ave
San Marcos, CA 92078

An Auto Parts & Supply in San Marcos CA

Welcome to Modern Builders, Inc. Whether you are a Developer, Builder, Architect, Designer, Masonry Contractor, or Homeowner, here's where you'll find the largest selection of stone, brick, block, slate, and hardscape products in San Diego County and South Orange County. Contact one of our personable and knowledgeable sales associates today.


Day Opening Closing
Monday - Friday 7:00 AM 5:00 PM
Saturday  7:00 AM 1:00 PM
Sunday Closed  
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