Downey wears its history proudly — from the Apollo program’s birthplace to the classic postwar ranch neighborhoods still defining its streets. Those mid-century homes are solidly built, but they’re at the age where infrastructure can’t be deferred: original galvanized plumbing, cast-iron drains, sewer laterals that have served sixty-plus years. The question isn’t whether the work is needed — it’s whether to manage three contractors or hire one.
Mars Construction Industries Corp is the one-contractor answer, backed by 30+ years of hands-on experience. Four CSLB licenses in-house — A General Engineering, B General Building, C-36 Plumbing, C-20 HVAC (Lic. #1138550) — so the repipe, the sewer lateral, the kitchen remodel, and the HVAC replacement on your Downey ranch run through one licensed, bonded, and insured team. One estimate, one schedule, one project manager.
Construction & Remodeling Services in Downey, CA
Postwar Downey homes reward contractors who look below the surface first. We camera-inspect sewer laterals and assess supply plumbing before demolition, because discovering a failing cast-iron drain mid-remodel is how budgets die. Our C-36 crews handle whole-home repipes, water heaters, and gas lines as integrated parts of the project, and trenchless lining with a 20-year warranty replaces shot laterals without trenching the landscaping. The visible work matters too: ranch floor plans adapt beautifully to modern living — opened kitchens, renovated baths with properly vented plumbing and balanced HVAC, additions where the lot allows.
Downey’s commercial corridors — Firestone, Lakewood, downtown — bring tenant-improvement work: offices, retail, and restaurant interiors where in-house plumbing and HVAC keep the mechanical scopes from stalling the opening. And our C-20 crews replace aging HVAC and balance comfort across ranch floor plans that were never designed for today’s expectations.
- Kitchen and bath remodels — ranch-home renovations re-planned for modern living, all trades in-house.
- Repipes and sewer renewal — camera inspection, repipes, trenchless lining with a 20-year warranty.
- Room additions — engineered additions matching the ranch aesthetic, under our A and B licenses.
- ADUs and garage conversions — designed and built by our ADU Cities team (100+ in four years).
- HVAC install, replacement, and repair — C-20 crews for aging systems and ranch floor plans.
- Water heaters and gas lines — replacement and new runs by licensed C-36 plumbers.
- Commercial and tenant improvement — office, retail, and restaurant build-outs, licensed, bonded, and insured.
Why Downey Property Owners Choose Mars
Most projects don’t fail because of one bad trade — they fail in the gaps between trades. Mars Construction Industries Corp was built to eliminate those gaps. We hold four CSLB licenses in-house — A General Engineering, B General Building, C-36 Plumbing, C-20 HVAC (Lic. #1138550) — so the engineering, building, plumbing, and mechanical work on your project all answer to one accountable team.
One estimate covers the whole scope. One project manager runs the schedule. And when something unexpected turns up behind a wall in Downey, our plumber and our carpenter already work for the same company — work doesn’t stall while you hunt for another contractor.
With 30+ years of hands-on experience and based in Orange, California, we’re licensed, bonded, and insured, with SB-PW and SB(Micro) certifications. Our sister brands — 911 Drain Lines, ADU Cities, Get Your Roof Certified, Universal Inspect — cover a property’s full life, and our trenchless sewer lining carries a 20-year warranty. One call, one team, one throat to choke.
Proudly Serving Downey and Los Angeles County
Downey sits in southeast Los Angeles County, well within our roughly 50-mile radius from Orange County — our crews are across the 5 and 605 corridors regularly. Postwar housing stock is exactly what our four-license model serves best: infrastructure work and visible remodel, planned together, built by one team. Call 310.880.9718 or email brett@marsx.construction.
Frequently Asked Questions
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 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.
Will I deal with several contractors?
No — that’s the point of hiring us. One project manager, one schedule, one company accountable for the finished work. Most projects never need an outside trade; when they do, we coordinate them.
Our home still has the original 1960s plumbing and drains. Where do we start?
With diagnostics, not demolition. We’ll camera-inspect your sewer lateral and assess the supply lines so you see what’s failing versus what’s simply old. Then we sequence honestly: underground and in-wall work first, the remodel second. With plumbers and builders in one company, that happens under one schedule — with video evidence behind every recommendation.
Get a Straight Answer on Your Project
Remodel, addition, repipe, new HVAC, or commercial build-out in Downey — talk to the contractor who can do all of it. Call Mars Construction Industries Corp at 310.880.9718 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.