Tustin is a tale of two cities: historic Old Town, with some of Orange County’s oldest homes, and the Irvine-adjacent planned neighborhoods — including the Tustin Legacy area — with much newer construction. A contractor working here needs range: the judgment to renovate a historic home properly, and the systems knowledge to service modern planned-community homes.
That range is what a four-license general contractor brings. Whether it’s a 1920s Old Town house with aging plumbing and a 1960s tract home with an original HVAC system, the work usually crosses trades — and Mars Construction Industries Corp holds all four in-house: A (General Engineering), B (General Building), C-36 (Plumbing), and C-20 (HVAC) under CSLB license #1138550. One team, one schedule, no gaps between the carpenter, the plumber, and the HVAC tech.
Construction & Remodeling Services in Tustin, CA
In Old Town Tustin, we renovate historic homes with care for their character — kitchen and bath remodels, additions that match the original architecture, and full mechanical updates behind the walls. Older homes here often need repipes, sewer lateral attention, and HVAC replacement all at once, which is exactly the kind of multi-trade project our model is built for.
In the planned neighborhoods and Tustin Legacy area, the work looks different: finish-level kitchen and bath upgrades, room additions for growing families, and ADUs. Through our sister brand ADU Cities, we’ve delivered more than 100 accessory dwelling units in four years — a strong option on Tustin’s generous lots. We also handle the commercial side: Tustin’s business corridors near Irvine generate steady tenant improvement and office buildout work, with plumbing and HVAC handled in-house.
Across the city, our 911 Drain Lines division handles drain and sewer work — camera inspection, hydro jetting, and trenchless repair with a 20-year warranty on sewer lining — and our HVAC crews install, replace, and repair systems for homes of every era.
- Historic home renovations in Old Town Tustin
- Kitchen and bathroom remodels across all neighborhoods
- Room additions and ADUs via ADU Cities (100+ built in four years)
- Repipes and whole-house plumbing upgrades
- Sewer inspection, hydro jetting, and trenchless repair with a 20-year lining warranty
- HVAC install, replacement, and repair
- Commercial tenant improvement and office buildouts
- Water heaters and gas lines
Why Tustin Property Owners Choose Mars
From Old Town Victorians to Tustin Legacy new builds, here’s why Tustin property owners choose one accountable team:
Mars Construction Industries Corp is a general contractor backed by 30+ years of hands-on experience, based in Orange, California. We are licensed, bonded, and insured, holding four CSLB classifications in-house under license #1138550: A (General Engineering), B (General Building), C-36 (Plumbing), and C-20 (HVAC). We are also SB-PW and SB(Micro) certified.
That means one accountable team. Most projects cross trades, and that is where jobs stall — the plumber blames the framer, and you are left managing people who do not work for you. With Mars, the general contractor, the plumbing crew, and the HVAC crew are the same company: one estimate, one schedule, one phone number, and no gaps between trades.
Proudly Serving Tustin and Orange County
Tustin sits in Orange County, and we serve it regularly from our Orange County home base. We’re based in neighboring Orange, so Tustin is right in our backyard — we serve all of Orange County daily, plus surrounding Los Angeles County and Inland Empire communities.
Frequently Asked Questions
Is Mars Construction Industries Corp licensed for this work?
Yes. We operate under CSLB license #1138550 with four classifications in-house: A (General Engineering), B (General Building), C-36 (Plumbing), and C-20 (HVAC). We are licensed, bonded, and insured, and we hold SB-PW and SB(Micro) small-business certifications. You can verify any contractor’s license status through the Contractors State License Board before you sign anything — and you should.
My home is older. How do I know whether to remodel or address the mechanical systems first?
We look at both together during the walkthrough. On older homes it often makes sense to handle repipes, sewer, and HVAC as part of the remodel — opening walls once instead of twice. Our written proposal lays out the options so you can decide with real information.
Do you subcontract everything out?
No. We self-perform across our four licensed classifications — general construction, plumbing, drain and sewer, and HVAC — which covers the bulk of most residential and commercial projects. For work outside our classifications, such as electrical, we coordinate properly licensed subcontractors and stay accountable for their work as your general contractor. You still deal with one team.
Can you build an ADU on my property?
Yes. Through our sister brand ADU Cities, we’ve delivered more than 100 accessory dwelling units in the last four years — garage conversions, detached units, and attached additions. We handle the project from design coordination through construction, plumbing, and HVAC, so the ADU is finished by the same accountable team that started it.
Get a Straight Answer on Your Project
Planning a remodel, an addition, an ADU, or just need a straight answer about a plumbing or HVAC problem? Talk to a contractor that can do it all. Call Mars Construction Industries Corp at 310.880.9718 or email brett@marsx.construction for a walkthrough and a written proposal. One team, four licenses, and an answer you can build on.
Plumbing or drain emergency? Our sister brand 911 Drain Lines answers around the clock at 714.746.7611.