Commercial Construction Companies in Rosemead, CA

At RJ Design & Builder INC, we combine modern architectural design with hands-on construction expertise to deliver high-quality, code-compliant residential and commercial renovations across Los Angeles. What sets us apart is our full-service approach—we handle everything from design, permit drawings, and engineering to build-out and final finishes. With years of experience and a strong understanding of local building codes, we bring both creativity and technical precision to every project. Our bilingual team (English/Chinese) ensures clear communication with diverse clients and city officials. We are detail-oriented, reliable, and dedicated to sustainable building solutions that meet both aesthetic and functional needs. We don’t just complete jobs—we build long-term trust by delivering projects on time, on budget, and with the quality you can see.

SJZ, founded 15+ years ago by Sammy Zablen, is a Los Angeles born and bred home improvement team dedicated to improving the remodeling and renovation experience for you no matter the scope of your project. We bring home the know-how you need on budget and on time. Your home is your most important asset and we pledge to increase the joy and the value it brings you.

Family owned business. Professional and quality work

What really sets us apart from our competition is the constant communication and quality of our services. From kitchen and bathroom remodeling to building your home from scratch, adding a room, or even backyard or painting jobs, we have a team of professionals to get it done in a timely and respectful manner. We will keep you in touch with all projects on a DAILY basis with photos of the progress so you know exactly what's being done, and when. You'll always be in-the-know with Hi-Tech Builders. We've been in business since 1991, and our customers absolutely love us! We service Ventura County, Los Angeles County, Orange County for all projects. Our owner David, is very personable and will not sign off on a job that our customers are not 100% satisfied with. We look forward to working with you! Seeing the look on our clients face when they see the finished product is 100% our favorite part.