Diamond Bar’s hillside setting is its signature — homes terraced into the slopes with views across the valley. It’s also what makes construction here more demanding than flat-land suburbs. Hillside lots mean drainage to manage, grading to respect, and structural work that must be engineered, not guessed at. A contractor without an engineering license is a liability on a hill; one with it is an asset.
Mars Construction Industries Corp holds that license — A General Engineering — alongside B General Building, C-36 Plumbing, and C-20 HVAC, all in-house under CSLB #1138550. With 30+ years of hands-on experience we’ve run the multi-trade model hillside properties demand: structural, drainage, plumbing, and mechanical work coordinated by one licensed, bonded, and insured team, one project manager, one detailed estimate.
Construction & Remodeling Services in Diamond Bar, CA
Hillside homes punish deferred maintenance. Water follows gravity, and on a slope it finds every weak point — which is why our Diamond Bar work often starts below the surface: drainage corrections, sewer camera inspections, and foundation-era plumbing assessments by crews who understand hillside construction. Our A license means structural modifications and grading-related work get engineered properly. Above ground, homeowners invest in view-oriented kitchens, primary suites, and outdoor living; our building, plumbing, and HVAC crews are one company, so a kitchen that moves the gas range and opens the floor plan gets designed once and built cleanly.
Growing families look to additions and ADUs — 100+ built in four years through ADU Cities — and Diamond Bar’s larger hillside lots accommodate detached units that flat lots can’t, engineered for the terrain. Our C-20 crews zone HVAC for multi-level floor plans, and our C-36 plumbers run the gas lines and repipes.
- Hillside structural and drainage work — engineered modifications and drainage corrections under our A license.
- Luxury kitchen and bath remodels — view-oriented renovations with in-house plumbing, gas, and HVAC.
- Room additions and ADUs — designed and built by our ADU Cities team, engineered for hillside lots.
- Sewer camera inspection and trenchless lining — diagnose slope-stressed laterals; 20-year warranty.
- Whole-home repipes — modern supply plumbing routed cleanly through existing construction.
- HVAC replacement and zoning — C-20 crews designing comfort for multi-level floor plans.
- 24/7 emergency drain and plumbing — through 911 Drain Lines at 714.746.7611.
Why Diamond Bar 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 Diamond Bar keeps hiring us for.
Proudly Serving Diamond Bar and Los Angeles County
Diamond Bar sits at the eastern edge of Los Angeles County where the 57 and 60 meet — well within our roughly 50-mile radius from Orange County, and a regular stop along the 57 corridor. On a slope, an in-house engineering license matters; few residential remodelers bring one. Call 310.880.9718.
Frequently Asked Questions
Do you take on commercial work?
Absolutely — offices, retail, restaurants, and light industrial/warehouse interiors. We’re licensed, bonded, and insured for commercial work with SB-PW and SB(Micro) certifications, and in-house plumbing and HVAC keep TI schedules tight.
Are you licensed to do this work?
Yes. Mars Construction Industries Corp holds CSLB #1138550 — A General Engineering, B General Building, C-36 Plumbing, and C-20 HVAC. We’re licensed, bonded, and insured, with SB-PW and SB(Micro) certifications. Verify any California contractor at cslb.ca.gov — we encourage it.
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.
Our home is on a hillside lot. Does that change how you’d approach a remodel or addition?
Yes — and it’s why our A General Engineering license matters. Hillside work involves drainage and structural considerations a standard remodeler can’t engineer. We’ll assess site conditions during the walkthrough and design the structural approach properly from the start, rather than discovering the slope’s opinions mid-project.
Get a Straight Answer on Your Project
Remodel, addition, repipe, new HVAC, or commercial build-out in Diamond Bar — 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.
One accountable team. Four licenses. With 30+ years of hands-on experience. That’s Mars.