Home Addition Contractor Los Angeles | Room Additions & Second Story Expansions

Home Addition

Room Addition, Footprint Expansion, and Second Story Addition

Looking to expand your home? Onyx General Construction specializes in building high-quality home additions that enhance your living space and property value. Whether you're expanding for a growing family, adding a new room, extending your foundation footprint, or building upward with a second story, our team delivers personalized solutions that comply with Los Angeles building codes and zoning regulations. With a strong focus on craftsmanship, permitting expertise, structural engineering, and efficient project execution, we make the entire process — from concept to final build — smooth, compliant, and detail-driven.

Trusted Expertise in Home Additions

With over a decade of hands-on experience, Onyx General Construction has earned a reputation as a leading home addition contractor in Los Angeles. Our team understands the structural, zoning, and design complexities that come with expanding an existing home. From concept and permitting to framing and final finishes, we handle every step with precision and professionalism. Whether you’re adding a new bedroom, expanding your kitchen, or building a second story, our technical expertise ensures every addition is seamless, functional, and fully code-compliant.

Custom-Tailored Design and Planning

Every home addition should feel like a natural extension of your lifestyle and architecture. That’s why we take a collaborative, design-driven approach from day one. Our designers, engineers, and project managers work closely with you to create a plan that complements your home’s structure while enhancing comfort and usability. Whether you envision a spacious primary suite, an open-concept family area, or a full multi-room expansion, we tailor every element — from layout to materials — to reflect your goals, budget, and long-term vision for your home.

Exterior view of a modern room addition in Los Angeles featuring smooth white stucco walls, sliding glass doors, and seamless roof integration.
Modern two-story home addition in Los Angeles with white stucco exterior, large windows, and natural light designed by Onyx General Construction.
Dining room home addition with custom wood pergola, large windows, and sliding doors built by Onyx General Construction in Los Angeles.
Mid-century modern inspired backyard home addition with sliding glass doors and natural wood finishes by Onyx General Construction.
Two-story home with a modern second-floor addition featuring large windows, a flat roofline, and a smooth white stucco finish.
Rear yard home addition in Los Angeles with sliding glass doors and a hardwood deck designed by Onyx General Construction.

Types of Home Additions We Offer

  1. Room Additions: Add extra bedrooms, living rooms, or offices to increase usable space and functionality.
  2. Second Story Additions: Build upward to maximize square footage without sacrificing yard space.
  3. Kitchen Expansions: Open up and extend your kitchen for more comfort, storage, and entertaining space.
  4. Bathroom Additions: Add a new bathroom for convenience, guests, or growing families.
  5. Garage Conversions: Turn existing garages into livable areas like studios, guest suites, or home offices.

Precision, Integrity, and Lasting Craftsmanship

At Onyx General Construction, every home addition is built with purpose, precision, and pride. We believe expanding your home should feel effortless — both in function and design. That’s why our team works closely with trusted engineers, architects, and craftsmen to ensure every structural connection, finish, and fixture aligns with the highest standards. Using premium materials and field-tested building methods, we deliver additions that blend seamlessly with your existing home while standing strong for decades to come. The result is a flawless balance of beauty, durability, and true construction integrity.

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

Home Additions That Add Lasting Value

At Onyx General Construction, we specialize in creating seamless home additions that expand your space while enhancing your property’s beauty and value. Whether it’s a new bedroom, extended living area, or a full second-story addition, our team delivers functional design and structural precision on every project. Each addition is engineered for long-term performance, energy efficiency, and perfect integration with your existing home’s architecture—so it looks original, not added on.

Start Your Home Addition with Confidence

From design and permits to construction and finishing details, Onyx General Construction manages every phase with care, communication, and transparency. Our proven process ensures your addition is completed on time, on budget, and to the highest standard of craftsmanship. If you’re ready to create more space, comfort, and value in your home, contact our team today for a free consultation. Let’s plan your custom addition and bring your vision to life.

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