Design & Build — Los Angeles
Bring Your Vision to Life with In-House Design, Engineering & Permits
From first sketch to final walkthrough, Onyx General Construction delivers ADUs, home additions, and major remodels with precision, speed, and transparent budgets.
Design-First. Build-Ready.
We integrate architecture, structural engineering, MEP coordination, and permitting under one roof. Our 3D modeling and BIM-driven approach eliminates guesswork, controls scope, and keeps your project build-ready from Day 1.
Photoreal visuals for fast approvals
Material + layout optimization
LA City / County expertise
Design & Build Services
ADU Design + Build
Garage conversions, detached ADUs, and multi-unit ADUs. Site planning, setbacks, utilities, Title 24, and plan check handled end-to-end.
Home Additions
Single-story, second-story, and primary suite expansions with structural analysis, lateral design, and matched finishes.
Commercial Remodeling
Space planning, ADA upgrades, MEP coordination, and phased construction to keep operations running.
Every Design Detail Matters
Architecture & Space Planning
Optimize circulation, daylight, and storage. We design modern California layouts that feel larger and live better.
- Site study, setbacks, easements
- Program analysis & room adjacencies
- Window/door schedules & egress
Structural Engineering
Foundation, framing, shear walls, and seismic detailing sized for code and constructability.
- Gravity + lateral design (ASCE 7)
- Footing/piers, hold-downs, collectors
- Second-story load paths & retrofits
MEP Coordination
Mechanical, electrical, and plumbing routed cleanly with access and serviceability in mind.
- Panel sizing & dedicated circuits
- HVAC placement and duct routes
- Gas, water, and sewer tie-ins
Energy & Envelope
Title 24 compliance, insulation, glazing, and air sealing for comfort and efficiency.
- Fenestration & SHGC/U-factor specs
- Roofing, WRB, and flashing details
- Heat pump & all-electric options
Our 6-Step Process
1. Discovery & Feasibility
Zoning, utilities, and budget alignment. Quick site study and timeline.
2. Concept & 3D Modeling
Iterative layouts with photoreal renders to preview materials and light.
3. Engineering & Permit Set
Stamped plans, Title 24, and plan-check responses until approved.
4. Pre-Construction
Selections, procurement, and value engineering to lock budget.
5. Build
Pro site management, inspections, and clean milestones with QA/QC.
6. Handover
Final punch, warranties, and a living record set for future upgrades.
Recent Work
Proudly Serving Los Angeles, Culver City, and Santa Monica
Our team knows local codes, plan-check processes, and utility requirements across LA neighborhoods—Mar Vista, West Adams, Palms, Sawtelle, Venice, Pico-Robertson, and beyond.
- Los Angeles: R1/R2 zoning, ADU standards ordinance, utility coordination
- Culver City: Streamlined ADU program, alley access solutions
- Santa Monica: Coastal considerations, green-building standards
What Clients Say
“Onyx handled design, permits, and construction on our ADU with zero surprises. The renders matched the final build.” — R.A., Culver City
“Structural details were thoughtful and cost-effective. Inspections passed first try.” — M.S., Santa Monica
FAQ
How much does an ADU cost?
Costs vary with utilities, foundation, and finishes. Many detached ADUs land between $250–$450/sf. We provide a line-item estimate after feasibility and concept.
Can you convert my garage?
Yes. We verify setbacks, fire separation, and structural upgrades, then design to maximize ceiling height and daylight.
Do you help with financing or ROI?
We model rents, payback, and cash flow. Many clients use ADUs for long-term rental income or family use.
Start Your Design & Build
Get a free, no-obligation consultation. We’ll review your property and map the best path to permits and construction.