San Marino is one of Southern California’s most distinguished residential cities — estate homes, historic properties, and tree-lined streets anchored by the Huntington Library and gardens. The homes here are substantial and often historic: properties where a renovation is a careful undertaking, where original character matters, and where the infrastructure — plumbing, gas, HVAC, sewer laterals — may be decades old beneath beautiful finishes. Projects at this level fail when they’re fragmented across contractors. They succeed when one accountable team controls the construction, the plumbing, and the mechanical systems together.
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 team, one contract, and one point of responsibility for your construction, plumbing, drain and sewer work, and HVAC.
Construction & Remodeling Services in San Marino, CA
Our San Marino work centers on whole-home remodels and high-end renovations of historic and estate properties. These projects demand sequencing discipline: infrastructure first, finishes last. With our C-36 plumbing and C-20 HVAC licenses in-house, a whole-home renovation can include a full repipe, new gas lines, water heater upgrades, and a modern multi-zone HVAC system — all planned and executed by the same team that’s handling the framing, drywall, and finish carpentry. Nothing gets lost between trades.
Kitchen and bathroom renovations in San Marino are often about honoring a home’s character while bringing its systems current. We handle fixture relocations, drain reconfigurations, and supply line renewal as part of the remodel — not as change orders from a separate plumber. Additions — primary suites, expanded kitchens, great rooms — are engineered to integrate with the existing structure, inside and out.
On estate lots, we also provide drain and sewer services: camera inspection, hydro jetting, and trenchless sewer repair, with a 20-year warranty on our sewer lining. Long laterals under mature landscaping are exactly where trenchless methods earn their keep — rehabilitating the line without disturbing the grounds. We also build ADUs and guest houses for multigenerational family or staff, drawing on more than 100 ADU builds in four years through our sister brand ADU Cities.
- Whole-home remodels and estate renovations
- Kitchen and bathroom renovations, honoring historic character
- Room additions: primary suites, kitchen expansions, great rooms
- 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, including multi-zone systems
- Guest houses and ADUs
Why San Marino Property Owners Choose Mars
Estate and historic properties demand a single accountable team, and that’s 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. We’ve been operating with 30+ years of hands-on experience, we’re licensed, bonded, and insured (CSLB #1138550), and we’re SB-PW and SB(Micro) certified. You get disciplined sequencing, one point of responsibility, and a contractor whose licenses cover the work actually being done — the standard a San Marino property deserves. Our sister brands — 911 Drain Lines, ADU Cities, Get Your Roof Certified, and Universal Inspect — extend what one relationship covers.
Proudly Serving San Marino and Los Angeles County
San Marino is in the western San Gabriel Valley in Los Angeles County, within our service area. Our home base is at 1119 W. Collins Ave, Orange, CA 92867, and we serve the area’s distinguished communities within roughly a 50-mile radius — with the discretion these properties expect.
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 licensing on the CSLB website before hiring anyone. Our license is CSLB #1138550 — A General Engineering, B General Building, C-36 Plumbing, and C-20 HVAC.
How does your estimate process work for large renovations?
We walk the property with you, assess both the visible scope and the infrastructure behind it — plumbing, gas, HVAC, sewer — and provide a written estimate. For whole-home work, we lay out the sequence of trades so you understand how the project flows.
Can you update infrastructure without damaging historic character?
Yes. Repipes, gas lines, and HVAC upgrades happen behind walls and in mechanical spaces; the visible finishes are restored to match the home’s character. Because one team handles both the infrastructure and the finishes, nothing falls through the cracks.
Which trades do you handle in-house?
General construction and remodeling, plumbing, drain and sewer, and HVAC — all under our own licenses. Electrical work is performed by qualified licensed electricians we bring in, since we do not hold the C-10 electrical classification.
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
Historic and estate properties deserve a contractor who can cover the whole scope. Tell us what you’re planning and we’ll give you a straight answer. Call 310.880.9718 or email brett@marsx.construction. One accountable team, four licenses in-house, operating with 30+ years of hands-on experience.