Duarte sits where the San Gabriel Valley meets the foothills — established neighborhoods climbing toward the mountains, the City of Hope campus anchoring the local economy, housing stock mixing mid-century originals with newer infill. Foothill construction has its own rules: drainage matters, slopes complicate everything, and older homes at the mountain’s base have infrastructure that’s seen decades of seasons.
Mars Construction Industries Corp is equipped for this terrain. Four CSLB licenses in-house — including A General Engineering, the license 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 foothill properties need: structural, drainage, plumbing, and mechanical work coordinated by one licensed, bonded, and insured team.
Construction & Remodeling Services in Duarte, CA
Foothill homes demand respect for water. Our Duarte work often begins below the surface: drainage assessment, sewer camera inspection, foundation-era plumbing review by crews who understand foothill construction. Our A license means slope-adjacent structural and site work gets designed properly, not improvised — and trenchless lining with our 20-year warranty renews shifted laterals without major excavation on sloped lots. Inside, mid-century homes get the full renewal: whole-home repipes, kitchen and bath remodels re-planning dated layouts, and HVAC replacements sized for homes that bake in summer and chill in winter.
The City of Hope district and commercial corridors generate medical-adjacent and general TI work — offices and professional spaces where our in-house plumbing and HVAC keep restroom and mechanical scopes on our own schedule. And our ADU Cities division (100+ in four years) builds guest units and additions engineered for the terrain.
- Foothill drainage and structural work — engineered corrections and slope-adjacent work under our A license.
- Kitchen and bath remodels — mid-century renovations with in-house plumbing, gas, and HVAC.
- Repipes and sewer renewal — camera inspection, repipes, trenchless lining with a 20-year warranty.
- HVAC install, replacement, and repair — C-20 crews for foothill temperature swings.
- 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 medical-adjacent TI — office and professional build-outs, licensed, bonded, and insured.
Why Duarte 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 Duarte, 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 Duarte and Los Angeles County
Duarte is part of the San Gabriel Valley in Los Angeles County, served regularly from our Orange County home base — well within our roughly 50-mile radius. Foothill properties get special attention here because our A General Engineering license actually applies: drainage, slopes, and structural modifications engineered in-house. Call 310.880.9718.
Frequently Asked Questions
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.
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. Duarte is squarely in our service area — our crews are in Los Angeles County regularly.
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.
Our property slopes and we’ve had drainage concerns. Can you address that as part of a remodel?
Yes — and it’s smart to handle it together. Our A General Engineering license covers drainage corrections and slope-adjacent structural design. We’ll assess how water moves across your lot during the walkthrough and engineer the fix into the project plan, so the remodel upstairs isn’t undermined by water problems below.
Get a Straight Answer on Your Project
Remodel, addition, repipe, new HVAC, or commercial build-out in Duarte — 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.