Ontario runs on two engines: the historic downtown neighborhoods with homes going back a century, and the airport-and-logistics economy keeping the commercial corridors humming. A contractor who only does pretty kitchen remodels is half a contractor here. Ontario needs a company that can repipe a 1940s bungalow on Monday and build out a warehouse office on Friday — and coordinate both without excuses.
That’s the Mars model. With 30+ years of hands-on experience we’ve operated as a true multi-trade contractor with four CSLB licenses in-house: A General Engineering, B General Building, C-36 Plumbing, C-20 HVAC (Lic. #1138550). Residential remodels, commercial TI, and industrial-adjacent work all come from one licensed, bonded, and insured team with one project manager accountable for the result.
Construction & Remodeling Services in Ontario, CA
In Ontario’s historic neighborhoods, the hidden infrastructure tells the story: galvanized supply lines, cast-iron drains, sewer laterals ready for retirement. We start with camera inspection so you see the lines’ condition before spending anything; our C-36 crews then handle repipes, water heaters, and gas lines as a coordinated project. Failing laterals get trenchless lining with our 20-year warranty — no torn-up yard. On the commercial side, the airport and logistics district drives TI demand: offices carved from warehouse space, retail and restaurant build-outs where our in-house plumbing and HVAC keep restroom rough-in and mechanical work from stalling the schedule.
Residential growth brings the familiar calls too: kitchen and bath remodels, additions, and ADUs — 100+ built in four years through ADU Cities, a strong fit for Ontario’s larger lots. And our C-20 crews size HVAC for Inland Empire heat in homes and commercial spaces alike.
- Commercial and warehouse tenant improvement — office, retail, and industrial interiors with in-house plumbing and HVAC.
- Repipes and sewer renewal — camera inspection, repipes, hydro jetting, trenchless lining with a 20-year warranty.
- Kitchen and bath remodels — full renovations with plumbing, gas, and HVAC by our own crews.
- ADUs and garage conversions — designed and built by our ADU Cities team.
- HVAC install, replacement, and repair — C-20 crews for IE heat, residential and commercial.
- Water heaters and gas lines — replacement, upgrades, and new runs.
- Room additions and structural work — engineered additions under our A and B licenses.
Why Ontario Property Owners Choose Mars
The classic remodeling horror story goes like this: three contractors, three schedules, and nobody responsible when something goes wrong. We’re the opposite of that. Mars Construction Industries Corp is licensed, bonded, and insured (CSLB #1138550), backed by 30+ years of hands-on experience, and we hold four trade licenses in-house — A General Engineering, B General Building, C-36 Plumbing, C-20 HVAC — so most of your project never leaves our own crews.
That changes the experience: the company that bids your kitchen remodel also moves the gas line, sizes the HVAC for the new floor plan, and handles the structural work. No finger-pointing between subs, no stacked mystery markups, no waiting weeks for a trade contractor to fit you in.
We’re based in Orange, California, and carry SB-PW and SB(Micro) certifications. Through 911 Drain Lines, ADU Cities, Get Your Roof Certified, and Universal Inspect, we serve a property end to end — from the sewer lateral (our trenchless lining has a 20-year warranty) to the roof. Ontario hires us because one accountable team is simply easier, and the work turns out better.
Proudly Serving Ontario and San Bernardino County
Ontario is a cornerstone of our Inland Empire service area in San Bernardino County, minutes from the airport and logistics corridor. Our IE crews are here regularly — reach them directly at 909.325.0020. Ontario’s blend of historic homes and working commercial property is exactly where a four-license contractor proves its worth.
Frequently Asked Questions
Can you build an ADU on my property?
Yes — through ADU Cities we’ve built 100+ ADUs in four years. Design, permitting support, and construction in one design-build package: garage conversions, detached units, and attached additions.
What areas do you serve?
We’re based in Orange, California, working within roughly a 50-mile radius across Orange County, LA County, and the Inland Empire. Ontario is squarely in our service area — our crews are in San Bernardino County regularly.
How does your estimate process work?
Call 310.880.9718 or email brett@marsx.construction. We’ll walk the property, look at actual conditions, and give you a detailed written estimate spelling out scope, materials, and expectations. No pressure, no vague allowances — you know exactly what you’re buying before work starts.
Can you build out office space inside a warehouse or industrial building?
Yes — we regularly build offices, break rooms, and restrooms into industrial and warehouse spaces around the Ontario airport corridor. With plumbing and HVAC in-house, the restroom rough-in, break-room plumbing, and rooftop mechanical stay on our schedule. Call 310.880.9718 and we’ll walk the space and give you a detailed written estimate.
Get a Straight Answer on Your Project
Remodel, addition, repipe, new HVAC, or commercial build-out in Ontario — talk to the contractor who can do all of it. Call Mars Construction Industries Corp at 310.880.9718, or reach our Inland Empire team at 909.325.0020 or email brett@marsx.construction. We’ll give you a straight assessment and a detailed written estimate. Our office: 1119 W. Collins Ave, Orange, CA 92867.
Plumbing or drain emergency? Our sister brand 911 Drain Lines answers around the clock at 714.746.7611.
One accountable team. Four licenses. With 30+ years of hands-on experience. That’s Mars.