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Built on Trust.
Defined by Quality.

A licensed California contractor dedicated to premium craftsmanship, honest communication, and results that last a lifetime.

MJ3 Builders Team
Who We Are

MJ3 Builders Inc.

MJ3 Builders Inc. was founded with a single, unwavering mission: to deliver premium construction services with the professionalism, transparency, and craftsmanship that California homeowners and investors deserve.

Based in Wilmington, CA, we serve clients across greater Los Angeles — from residential home additions and ADUs to ground-up new construction and specialty trade work. Our team combines deep local knowledge, licensed expertise, and a genuine passion for building things that last.

Over the years, we have earned a reputation as one of the most reliable and professional contractors in the region. We don't cut corners. We communicate clearly. We finish what we start — on time and on budget.

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MJ3 Builders — Construction Quality MJ3 Builders — Project Detail
"Every project we take on represents someone's vision, investment, and trust. We take that responsibility seriously — and we build accordingly."
— MJ3 Builders Inc. · Wilmington, California
What We Stand For

Our Core Values

These principles guide every decision we make, every project we accept, and every client we serve.

01

Premium Craftsmanship

We use high-quality materials and employ skilled tradespeople who take genuine pride in their work. Every detail matters — from framing to finish.

02

Transparent Communication

No surprises. We keep clients informed at every stage — from permitting and procurement to inspections and completion.

03

Integrity & Accountability

We honor our commitments. If a challenge arises, we address it directly and find solutions — never passing costs or blame unfairly to the client.

04

Client-First Approach

Your vision, budget, and timeline are our priorities. We listen carefully and tailor every project plan to align with your unique goals.

05

Licensed & Code-Compliant

Every project is built to California code. We pull proper permits, pass all inspections, and ensure your investment is protected and insurable.

06

Long-Term Relationships

Many of our clients return for their next project and refer their neighbors. We build relationships the same way we build structures — to last.

Why Choose MJ3 Builders

The MJ3 Difference

Our clients choose us because we deliver — and because we treat every project with the same level of care and precision, regardless of size or budget.

Licensed, Bonded & Insured

Full California licensing and insurance coverage protects you and your property throughout the entire project.

Detailed Written Estimates

Every quote includes a comprehensive breakdown of labor, materials, and timeline — so you know exactly what to expect.

Proven Local Experience

Deep roots in the Wilmington and greater LA area mean we understand local codes, permit processes, and soil conditions.

ADU & Conversion Specialists

We specialize in California ADU compliance and garage conversion projects — navigating all permitting with ease.

Respectful of Your Home

Our crews maintain clean, organized job sites and treat your property with the respect and care it deserves.

Post-Project Support

Our relationship doesn't end at project completion. We stand behind our work and are available for any follow-up needs.

Start Your Project

Let's Build
Something Lasting.

Contact our team today to schedule a free consultation and receive a detailed estimate for your project.

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