Monrovia pairs a charming historic Old Town — brick storefronts, early-20th-century commercial buildings — with foothill neighborhoods of craftsman, Spanish, and mid-century homes climbing toward the San Gabriels. It’s a city that takes pride in its history, and property owners here renovate with an eye toward keeping character intact.
Character-sensitive renovation is skilled work, and it almost always crosses trades: a historic home’s kitchen remodel reveals plumbing that predates the remodeler, and a foothill addition needs HVAC extended and structural work coordinated. Mars Construction Industries Corp holds four CSLB classifications in-house — A (General Engineering), B (General Building), C-36 (Plumbing), and C-20 (HVAC) — so one accountable team handles the architecture, the pipes, and the air together.
Construction & Remodeling Services in Monrovia, CA
In Monrovia’s historic neighborhoods, we renovate older homes with respect for their bones — kitchen and bath remodels, additions matched to the original architecture, and full mechanical updates behind the walls. Our own C-36 crews handle repipes and sewer work; 911 Drain Lines camera-inspects laterals and performs trenchless repair with a 20-year warranty on lining — important in neighborhoods where mature trees and old clay lines meet.
In the foothill neighborhoods, we take on whole-home renovations, room additions, and HVAC systems sized for larger homes and warmer hillside exposures. Our A (General Engineering) classification keeps structural and site work — retaining, drainage, foundation-adjacent construction — in-house with the same accountability as the finish work.
Old Town’s commercial buildings get our tenant improvement treatment too: retail, office, and restaurant buildouts with plumbing, gas, and HVAC performed by our own crews and phased to keep businesses operating. And through ADU Cities, our sister brand with 100+ units delivered in four years, we build ADUs and garage conversions across the city.
- Historic home renovations with architectural sensitivity
- Kitchen and bathroom remodels
- Room additions matched to the existing home
- Whole-home mechanical updates — repipes, sewer, HVAC
- Old Town commercial tenant improvement
- ADUs and garage conversions via ADU Cities (100+ built in four years)
- Structural and site work under our A (General Engineering) classification
- Sewer camera inspection and trenchless repair with a 20-year lining warranty
Why Monrovia Property Owners Choose Mars
Monrovia’s history deserves a contractor that builds for the next hundred years. Here’s our model:
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 Monrovia and Los Angeles County
Monrovia sits in Los Angeles County, and we serve it regularly from our Orange County home base. We serve Monrovia and the surrounding foothill and San Gabriel Valley communities — Duarte, Arcadia, Pasadena, and beyond — working across Los Angeles County from our Orange County base.
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.
Will renovating our historic home destroy its character?
No — that’s the opposite of the goal. We match architectural details on additions and concentrate the modernization where it belongs: plumbing, HVAC, kitchens, baths, and floor plans. The neighborhood keeps its streetscape; you get a house that works.
Do you handle hillside structural and drainage work?
Yes. Our A (General Engineering) classification covers structural and site work, so retaining, drainage improvements, and foundation-adjacent construction stay with our own team under the same contract and accountability.
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.
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.