






License Type: General Engineering Contractor (type “A”)
License Type: General Contractor (type “B”)
License #: 654-243
After 45 successful years as a licensed Engineering General Contractor in Los Angeles, A-1 Construction has proudly transitioned from active builder to expert consultant. We’re no longer swinging hammers, but we’re still building something valuable: peace of mind for our clients.
A-1 Construction is now focused on sharing decades of knowledge and experience with homeowners, developers, and legal professionals.
We now offer consulting services designed to help you make informed and confident decisions in every phase of your project:
New Construction Consultation – Guidance before and during your build to help prevent delays, avoid costly mistakes, and keep your project running smoothly.
Construction Defect Mitigation – Identifying issues and recommending solutions to protect your investment.
Expert Witness Services – Providing reliable, experience-based testimony in construction-related legal cases, including code violations and slip and fall incidents.

Services | A-1 Construction Company
A-1 Construction, led by veteran contractor Avi Tirosh, delivers top-tier construction and consulting services across Southern California. Whether planning a new build, dealing with construction defects, or needing expert insight for a legal matter, A-1 Construction Co. is your go-to resource for clarity, quality, and results.
Our Consultation services provide expert advice and guidance throughout a project’s planning, design, and building phases. We help clients navigate challenges, ensure code compliance, and optimize cost, quality, and timelines.
Our Expert Witness services offer a thorough analysis and testimony in legal matters. Additionally, we provide reliable insights, thus ensuring you have the best expertise to support your case effectively.
Our Projects page features a diverse collection of completed work, demonstrating the breadth of our expertise. Moreover, it offers a closer look at our attention to detail and commitment to quality. By browsing the Project page, you’ll better understand the high standards we uphold in every project we undertake.
Multi-Units

At A-1 Construction Company, we bring expertise in the built-up brand new multi-unit projects, ranging from 2 units up to 80 units, ensuring high-quality results while staying on schedule and within budget. Whether you are a developer, investor, or property owner, we provide comprehensive services to meet your needs.
Custom Homes

We specialize in building high-quality custom homes that bring our client’s vision to life.
Commercial

We specialize in building high-quality commercial properties designed to meet the unique needs of businesses and investors.
Testimonials | A-1 Construction Company
Our company’s testimonials showcase the positive experiences of our satisfied clients. Furthermore, they highlight our commitment to quality and customer satisfaction. As a result, these reviews reflect our dedication to excellence, providing valuable insight into the exceptional service we consistently deliver.
Operation | A-1 Construction Company
We serve the Southern California.