ADU General Contractor Los Angeles | Garage Conversions & Accessory Buildings

Build Your ADU

ADU Design & Build, Garage Conversion Experts, and Custom Rec Room Construction

Looking to build an ADU or convert your garage into a livable space? Onyx General Construction specializes in designing and constructing Accessory Dwelling Units (ADUs) that blend functionality, comfort, and modern design. Whether it’s a detached guest house, rental unit, or a full garage conversion, our team manages every detail—from architectural planning and permitting to final construction. With deep experience navigating Los Angeles ADU regulations, we ensure your project is compliant, efficient, and built to last.

Expert ADU Builders in Los Angeles

At Onyx General Construction, we bring over a decade of hands-on experience in designing and building high-quality accessory dwelling units (ADUs) across Los Angeles. Our team understands the complexities of modern construction — from navigating city permitting and zoning codes to optimizing small-space layouts that balance style and functionality. Whether you’re building a detached backyard ADU, a garage conversion, or an over-garage unit, we handle every phase with precision, efficiency, and transparency.

Design-Driven, Client-Focused Approach

Every property — and every homeowner — has a unique vision. That’s why our approach to ADU construction is completely personalized. We collaborate closely with you from concept to completion, ensuring that your new living space complements your existing home while meeting your practical and aesthetic goals. Our in-house designers and craftsmen specialize in clean, modern finishes, energy efficiency, and seamless integration — delivering an ADU that feels custom-built for your lifestyle and long-term value.

ADU Planning Guide
Modern one-story ADU in Los Angeles with smooth limestone-style stucco, black steel-frame windows, drought-tolerant landscaping, and clean architectural lines built by Onyx General Construction Company
Contemporary ADU in Los Angeles with smooth stucco exterior, wood deck, and recessed patio design surrounded by greenery.
Contemporary ADU in Los Angeles featuring warm wood siding, flat roof, and sliding glass doors surrounded by lush trees.
Minimalist ADU with white stucco exterior, flat roof, black window frames, and desert-style landscaping with palm trees and agave plants in Los Angeles.
Two-story ADU in Los Angeles featuring a white stucco exterior, large modern windows, and a wood-accent front door surrounded by desert landscaping.
Small modern ADU with light stucco finish, flat roof, and sidewalk path in a Los Angeles backyard.

Our ADU Construction Process

  1. Consultation: Initial discussion to understand your vision and needs.
  2. Design: Creating custom plans to meet both functional and aesthetic goals.
  3. Permitting: Handling the necessary approvals with Los Angeles city authorities.
  4. Construction: Building with attention to detail and efficiency.
  5. Final Walkthrough: Ensuring everything meets your standards and our quality benchmarks.
Our Planning Process

Collaborative Planning and Trusted Craftsmanship

At Onyx General Construction, every ADU project begins with collaboration. We bring together our long-term network of trusted vendors, engineers, and skilled tradespeople to ensure that each build is executed with precision and consistency. Our team takes a hands-on approach to planning, coordinating every phase of construction — from site preparation and structural design to finish details and inspections. This direct involvement allows us to maintain full control over quality, scheduling, and cost efficiency, delivering a finished product that reflects both craftsmanship and thoughtful execution.

Our Building Process
Los Angeles hillside ADU with smooth stucco walls, slim roofline, and sliding glass doors surrounded by lush greenery and tall Italian cypress trees.
Room addition in Mar Vista Los Angeles with a Custom Design and construction
Accessory building ADU Construction company
ADU Addition garage conversion window installation, foundation work, electrical, construction of walls etc. in Los Angeles
Major Remodel with New Construction Room Addition in Los Angeles Room addition, bathroom addition, kitchen remodel, full remodeling

Building ADUs That Add Lasting Value

Onyx General Construction is more than just a licensed general contractor — we’re your strategic partner in maximizing the potential of your property. Whether it’s a detached ADU, garage conversion, or backyard guest suite, every project we take on is built to enhance both lifestyle and long-term property value. Our team ensures each design is compliant with Los Angeles zoning codes, energy-efficient, and crafted with premium materials for lasting performance.

Start Your ADU Project with Confidence

From concept and permits to construction and final finishes, Onyx General Construction manages every phase with transparency and professionalism. We take pride in delivering modern, high-quality ADUs that blend seamlessly with your existing home — designed around your needs, budget, and goals. If you’re ready to explore how an ADU can expand your living space or generate rental income, contact our team today for a free consultation. Let’s start planning your custom ADU and bring your vision to life.

Build My ADU!

Based in Los Angeles: ADU, Home Addition, and Remodeling General Contractor

Proudly serving Los Angeles and it's counties, we are Onyx General Construction Company. We provide a wide range of construction services. From kitchen and bathroom remodeling to new construction, home additions and ADU's. Major renovations and large scale construction projects are we shine. From commercial to residential, we have the manpower, the tools, and the logistics all lined up.

Service Areas

Hollywood, Ca
West Hollywood, Ca
Beverly Hills, Ca
Beverly Grove, Ca
Mid City, Ca
Cheviot Hills, Ca

Rancho Park, Ca
Pico-Robertson, Ca
Westwood, Ca
Brentwood, Ca
Pacific Palisades, Ca
Santa Monica, Ca

Venice, Ca
Mar Vista, Ca
Culver City, Ca
Playa Vista, Ca
Baldwin Hills, Ca
Ladera Heights, Ca

View Park, Ca
Marina Del rey, Ca
Westchester, Ca
Inglewood, Ca
Hawthorne, Ca
El Segundo, Ca

Finding a reliable general contractor or construction company can indeed be a challenging task. However, we are proud to inform you that we are a local business that has been successfully serving our area for the past several years. We understand the challenges in every construction project are different. We take the time to place a personalized approach to each project, ensuring that our client's needs and requirements are met. We take pride in our partnerships with reputable suppliers and subcontractors. Furthermore, we prioritize attention to detail in all aspects of our work. We understand that even the smallest details can make a significant difference in the final result. If you are in need of a reliable general contractor or construction company, we encourage you to contact us. We would be more than happy to discuss your project, provide a detailed estimate, and answer any questions you may have. Trust us to bring your vision to life.