Trusted Builders for Every Addition.

Onyx General Construction is a family-owned general contractor delivering seamless home additions and room expansions across Los Angeles. From ADU builds to full kitchen overhauls, we handle every trade under one roof.

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120+
Projects Completed
5
Avg Google Rating
15+
Years Serving Los Angeles
Licensed
& Insured
What We Do

One crew, every trade covered.

Modern 400 sq ft home addition under construction in Los Angeles backyard
Home Additions
We extend footprints with engineered slab-on-grade foundations, seismic retrofits, and flush rooflines that look original. Bedrooms, family rooms, or second stories—permits pulled same week.
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Interior view of new room addition seamlessly blended into existing Los Angeles home
Room Additions
Need a nursery or office? We pop out load-bearing walls, match existing stucco texture, and tie into HVAC without zone loss. Average timeline: 8 weeks start to finish.
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Detached ADU garage conversion with modern siding and large windows
ADU Construction
garages into 500 sq ft rental units with mini-split systems, tankless heaters, and separate meters. City-compliant setbacks and fire-rated drywall included.
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Sleek white and walnut kitchen remodel with waterfall quartz island
Kitchen Remodeling
Full guts to finish: we relocate gas lines, install soft-close cabinetry, waterfall quartz islands, and under-cab LED strips. Pull permits, schedule inspections, hand over keys.
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Modern bathroom addition featuring frameless glass shower and skylight
Bathroom Additions
Stacked plumbing, curbless showers, and skylight cut-ins. We waterproof with Schluter systems and deliver spa-grade tile work in under three weeks.
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Onyx team member reviewing stamped construction permits at LADBS counter
Permit Handling
Our in-house expediters submit plans at LADBS, track corrections, and secure sign-offs so you never queue at the counter.
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How We Work

Simple process, no surprises.

01
Free Consultation
We come to you, learn your goals, and answer every question. No pressure, no sales pitch.
02
Detailed Quote
A written scope of work with line-item pricing. You know exactly what you are paying for before we start.
03
We Build It
Our own crew on site, daily updates, and a clean worksite every evening. No subcontractor surprises.
04
Final Walkthrough
We walk every room with you before calling it done. You sign off, we consider it a success.
Reviews

What Los Angeles homeowners say.

"Onyx turned our cramped 2-bed into a 4-bed with a master suite and walk-in closet. They matched our 1950s hardwood perfectly; you can't tell where old meets new."

Rachel T.
Home Addition

"We added a 480 sq ft ADU where the old garage sat. Rented it on day one for $2,800/month. Onyx handled permits, solar tie-in, even landscaping."

Carlos M.
ADU Construction

"Kitchen reno included moving the range gas line and adding an island. Finished in 5 weeks and came in $3k under estimate. Clean crews every day."

Lisa K.
Kitchen Remodel
Get in Touch

Ready for more space?

Book your free design consultation today—plans and same-day estimate within 24 hours.

(213) 257-6666
Los Angeles, CA — serving the surrounding area
Mon-Sat, 8am-6pm