South El Monte is a working-class city with an industrial backbone — warehouses, small manufacturers, and commercial corridors alongside modest residential neighborhoods of postwar and mid-century homes. The construction needs here are practical: homeowners updating kitchens and baths, adding space for growing families, and renewing aging plumbing and HVAC; businesses improving warehouses, offices, and industrial spaces. In both worlds, projects cross trade lines — a warehouse TI that needs restroom plumbing and rooftop HVAC, a home remodel that needs a repipe. A contractor holding construction, plumbing, and HVAC licenses in-house keeps those projects under one roof and one budget.
Mars Construction Industries Corp is a multi-trade general contractor based in Orange, CA, operating with 30+ years of hands-on experience. We hold four CSLB licenses in-house — A General Engineering, B General Building, C-36 Plumbing, and C-20 HVAC (CSLB #1138550). One accountable team handles your construction, plumbing, drain and sewer work, and HVAC under a single contract.
Construction & Remodeling Services in South El Monte, CA
For homeowners, our South El Monte work focuses on practical, high-value improvements: kitchen and bathroom remodels, room additions for growing families, and ADUs. Through our sister brand ADU Cities, we’ve built more than 100 ADUs in four years — a proven way to add flexible space for family on a residential lot. We give straight answers and written estimates, and we tell you plainly what needs doing and what can wait.
Older homes here commonly need infrastructure work: repipes, water heater replacements, and gas line work — all in-house under our C-36 license — plus drain and sewer services including camera inspection, hydro jetting, and trenchless sewer repair. Our sewer lining carries a 20-year warranty. Pairing that work with a remodel means walls open once, not twice.
For businesses, we handle commercial and industrial tenant improvement: warehouse improvements, office build-outs, and renovations of industrial buildings, including the plumbing, drain, and HVAC work these projects require. Because those trades are in-house, a TI stays on one contract and one schedule — important when downtime costs money. We also install, replace, and repair HVAC systems for homes and commercial spaces alike.
- Kitchen and bathroom remodels
- Room additions and ADUs — 100+ ADUs built in four years through ADU Cities
- Repipes, water heaters, and gas lines
- Drain and sewer services: camera inspection, hydro jetting, trenchless repair, sewer lining (20-year warranty)
- HVAC installation, replacement, and repair — residential and commercial
- Commercial and industrial tenant improvement
- Warehouse and office build-outs
Why South El Monte Property Owners Choose Mars
One accountable team is our model: A, B, C-36, and C-20 licenses in-house means construction, plumbing, sewer, and HVAC are all performed by us under one contract. With 30+ years of hands-on experience, we’re licensed, bonded, and insured (CSLB #1138550), and we’re SB-PW and SB(Micro) certified. Homeowners get straight answers and written estimates; businesses get one team responsible for the schedule. Our sister brands — 911 Drain Lines, ADU Cities, Get Your Roof Certified, and Universal Inspect — extend what a single call covers.
Proudly Serving South El Monte and Los Angeles County
South El Monte is in the San Gabriel Valley in Los Angeles County, well within our service area. Our home base is at 1119 W. Collins Ave, Orange, CA 92867, and we serve SGV communities within roughly a 50-mile radius. Homes and businesses here get the same licensed, multi-trade team.
Frequently Asked Questions
Do I need a licensed contractor for my project?
In California, any construction project totaling $1,000 or more in labor and materials must be performed by a licensed contractor. Verify any license on the CSLB website before hiring. Ours is CSLB #1138550 — A General Engineering, B General Building, C-36 Plumbing, and C-20 HVAC.
How does your estimate process work?
We visit the property, walk through the project with you, and provide a written estimate. We’ll tell you plainly what the work involves and what it takes — no upsell, no pressure.
Can you build an ADU on my lot?
Often, yes. We’ve built more than 100 ADUs in four years through our sister brand ADU Cities. We’ll look at your lot and discuss what fits.
Do you do commercial and industrial work?
Yes. We handle tenant improvement for warehouses, offices, and industrial buildings, including the plumbing, drain, and HVAC work these projects require.
Do you handle plumbing or sewer emergencies?
Yes. Our sister brand 911 Drain Lines provides 24/7 drain and plumbing emergency service at 714.746.7611.
Get a Straight Answer on Your Project
Home project or commercial build-out — tell us what you need and we’ll give you a straight answer and a written estimate. Call 310.880.9718 or email brett@marsx.construction. One accountable team, four licenses in-house, operating with 30+ years of hands-on experience.