Glendora calls itself the Pride of the Foothills, and the setting earns it — a historic downtown village, neighborhoods climbing toward the San Gabriels, housing stock ranging from early-1900s originals to hillside contemporaries. Foothill construction has real technical demands: drainage, slopes, older infrastructure meeting mountain weather. The contractor who treats Glendora like flat-land suburbia learns the difference the expensive way.
Mars Construction Industries Corp brings the right licenses for the terrain. Four CSLB licenses in-house — including A General Engineering, the credential that matters on hillside and foothill work — plus B General Building, C-36 Plumbing, C-20 HVAC (Lic. #1138550). With 30+ years of hands-on experience we’ve run the multi-trade model Glendora properties need: structural, drainage, plumbing, and mechanical work engineered and built by one licensed, bonded, and insured team.
Construction & Remodeling Services in Glendora, CA
Foothill properties start below the surface. Our Glendora work often begins with drainage assessment and sewer camera inspection — slope-stressed laterals, root intrusion from mature hillside landscaping, the wear mountain-adjacent infrastructure accumulates. Our A license means drainage corrections and slope-adjacent structural work get designed properly, and trenchless lining with our 20-year warranty renews failing laterals without major excavation on difficult terrain. In the village and flatland neighborhoods, historic and mid-century homes get careful renewal: whole-home repipes routed to protect original finishes, kitchen and bath remodels respecting the architecture, water heaters replaced before they give out.
Foothill temperature swings make HVAC a priority: hot summers, genuinely cool winters, multi-level floor plans needing proper zoning — our C-20 crews size and install for actual loads. And our ADU Cities division (100+ in four years) builds guest units and additions engineered for the terrain, while our commercial crews handle office and retail build-outs in the downtown district.
- Foothill drainage and structural work — engineered corrections and slope-adjacent work under our A license.
- Kitchen and bath remodels — historic and mid-century renovations with in-house plumbing and HVAC.
- Repipes and sewer renewal — camera inspection, repipes, trenchless lining with a 20-year warranty.
- HVAC zoning and replacement — C-20 crews for foothill temperature swings and multi-level homes.
- Room additions and ADUs — via our ADU Cities team, engineered for the terrain.
- Water heaters and gas lines — replacement and new runs by licensed C-36 plumbers.
- Commercial and village TI — office and retail build-outs downtown, licensed, bonded, and insured.
Why Glendora Property Owners Choose Mars
Every property owner eventually chooses: manage a patchwork of trade contractors yourself, or hire one general contractor who owns the whole result. Backed by 30+ years of hands-on experience, Mars Construction Industries Corp has been the second kind — a licensed, bonded, and insured GC (CSLB #1138550) headquartered in Orange, California, holding four licenses in-house: A General Engineering, B General Building, C-36 Plumbing, C-20 HVAC.
Real projects are never single-trade. A bath remodel is plumbing, carpentry, and HVAC; an addition is engineering, building, plumbing, and mechanical. When one company holds all four licenses, there’s no seam for problems to hide in. You get one estimate, one schedule, and one project manager who answers for everything.
Our SB-PW and SB(Micro) certifications reflect the discipline we bring to the job site. And our sister brands — 911 Drain Lines, ADU Cities, Get Your Roof Certified, Universal Inspect — let us serve Los Angeles County properties end to end, from emergency drain calls to full ADU builds. When a sewer line needs lining, we back it with a 20-year warranty. That’s the accountability Glendora keeps hiring us for.
Proudly Serving Glendora and Los Angeles County
Glendora sits at the base of the San Gabriel Mountains in Los Angeles County, within our roughly 50-mile radius from Orange County — our crews serve the 210 corridor regularly. Foothill work is where our A General Engineering license earns its keep: engineers and builders on the same team, not the same invoice from different companies. Call 310.880.9718.
Frequently Asked Questions
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. Glendora is squarely in our service area — our crews are in Los Angeles County regularly.
Do you handle every trade in-house?
The trades that matter most — building, plumbing, HVAC — are our own licensed crews under CSLB #1138550. For specialty scopes outside our four licenses, we bring in vetted specialists and manage them. Either way, you deal with one accountable team and one point of contact.
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.
Our lot has slope and we’re worried about drainage affecting a planned addition. What do you do?
We assess it as part of the project, not an afterthought. Our A General Engineering license covers drainage corrections and slope-adjacent structural design — during the walkthrough we’ll look at how water moves across your lot and engineer the addition’s foundation and drainage accordingly. Handling the water plan and building plan together, with one team, is how foothill additions stay trouble-free.
Get a Straight Answer on Your Project
Remodel, addition, repipe, new HVAC, or commercial build-out in Glendora — 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.