Kitchen remodeling
Bathroom remodeling
Home additions & ADU
Roofing
Windows & doors
Driveway & pavers
FenceFree written scope consultation - allowances, timeline, and change-order rules on paper before a single trade is scheduled
Fast, Reliable General Contractor Across San Antonio Heights
Finding a general contractor who understands hillside construction in San Antonio Heights is different from hiring one in flatland cities like Upland or Rancho Cucamonga. Our team at Polaris Contractors regularly works on the terraced lots and open acreage along this unincorporated foothill corridor, and we know what LA County permits actually require before the first excavation. If you’re planning a kitchen remodel, room addition, garage conversion, or ADU in the 91784 ZIP code, call (855) 473-6535 to schedule a free estimate. We’ll walk the site with you and scope the geotechnical, septic, and access realities before we ever quote a number.
Why Polaris Contractors Is San Antonio Heights’s Preferred General Contractor Company
San Antonio Heights sits outside city boundaries, which means every project we take on here has to clear LA County’s Department of Building and Safety, not a local planning counter. That single fact changes how renovations get priced, sequenced, and approved. We’ve been through enough county submittals on Euclid Avenue-adjacent foothill properties to tell you early when a soil report will be triggered, when a caisson foundation makes sense, and when the septic leach field is going to reshape your ADU footprint. Homeowners along Mountain Avenue and the upper slopes of 24th Street tell us the same thing: flatland contractors quote low, then stall at the county window. Ours is the opposite approach.
We handle the full scope under one agreement, which matters more here than almost anywhere else in the Inland Empire. A home addition in San Antonio Heights might require demolition, hillside grading, retaining walls, framing, roofing, windows, and finish work. Polaris manages all of it with one accountable team led by Rick Sondermann. One contract, one schedule, one point of contact. No finger-pointing between subs when the county geologist raises a flag.
San Antonio Heights homeowners trust us because we give straight answers on county requirements before money changes hands. Our estimates account for the engineering reviews, haul routes, and erosion-control measures this unincorporated community actually needs. When we scope a detached ADU off a steep driveway, we’ve already factored in the short-load concrete deliveries and the swing radius for equipment. That’s local knowledge you won’t find on a template quote.
Styles & brands we work with
Hire a General Contractor in San Antonio Heights
Hire a General Contractor in San Antonio Heights when your project touches footing, framing, plumbing, electrical, or any structural component regulated by LA County. Homeowners here hire us for kitchen remodels in 1950s ranch houses, full bathroom overhauls in split-levels, and room additions on terraced lots that need retaining walls. A typical kitchen remodel in San Antonio Heights runs $14,000 – $45,000 depending on cabinet lines and whether you’re moving walls. Bathroom remodels range from $9,000 – $28,000. For larger work, a home addition lands between $45,000 – $130,000, while an ADU ranges $90,000 – $220,000. We scope the whole job before quoting so the number doesn’t drift.
County Permits and Submittals
We prepare and submit the LA County permit package on your behalf. For structural work on hillside lots, that often means a soils report, structural calculations, and a grading plan. We’ve done enough of these to flag likely geologist triggers during the initial walkthrough.
Full-Scope Coordination
From foundation through finish, one team runs the trades. Our General Contractor team manages schedules, inspections, and material deliveries so you aren’t coordinating an electrician, a roofer, and a cabinet crew on your own. That’s the entire reason homeowners in San Antonio Heights hire us instead of juggling specialty subs.
General Contractor Services in San Antonio Heights
General Contractor Services in San Antonio Heights cover everything from interior remodels to hardscape and outbuilding construction. We see a lot of aging ranch homes in the 91784 ZIP where original kitchens and baths are overdue for replacement and layouts don’t match how people live now. A small kitchen remodel starts around $9,000, while full kitchens with island builds run up to $45,000 in today’s county-priced market. On the exterior side, paver driveway installations run $7,000 – $18,000, and roof replacements on these hillside homes typically fall between $8,000 – $20,000. One team handles all of it.
Acreage-Specific Additions and ADUs
Open lots in San Antonio Heights give you room to build, but the county’s septic and well setback rules can reshape the plan. We site the structure around the leach field and water line first, then design. A prefab ADU through a manufacturer like Abodu or Boxabl can simplify the build once the site work is right.
Outbuildings, Shops, and Detached Structures
Many San Antonio Heights properties include detached garages that become workshops, studios, or rental units. A garage conversion typically costs $30,000 – $80,000, but the hidden variable here is the foundation. On upper-slope lots with landslide debris, expect a deeper caisson design and a geologist’s report before framing starts.
What happens when you call
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A real person answersNo phone trees — you reach a local pro.
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You get an upfront price rangeHonest numbers before anyone is dispatched.
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A background-checked tech heads outLicensed & insured, dispatched right away.
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You approve before work beginsNothing starts until you say go.
Trusted Brands We Service in San Antonio Heights
Polaris Contractors brings partner access to more than 50 nationally recognized brands, and that means we can match material selections to the specific demands of San Antonio Heights homes. When we install windows on a foothill lot with full southern exposure, we’ll often spec ES Windows or ECO Window Systems for their thermal performance and narrow sightlines. For entry doors that hold up to dry heat and occasional winter hard rains, Therma-Tru is a frequent pick. We also work with Mr-Glass for custom shower and mirror work on bathroom remodels. Because we’re a full-scope General Contractor in San Antonio Heights, we guide you to the right material for the budget and the site, not just what’s in stock at the yard.
Common General Contractor Problems We See in San Antonio Heights Homes
- Landslide-triggered soil reports on upper slopes. Homes along the upper foothill streets often sit on ancient landslide deposits, and LA County geologists routinely require soil analysis and caisson foundations before approving even modest additions. This is the single biggest cost surprise we correct for homeowners in San Antonio Heights.
- Equipment access on steep, narrow driveways. Many terraced lots can’t take a full-size concrete truck or forklift. We’ve run projects where every cubic yard of concrete came up the hill in short loads, which changes the labor math and the schedule. Our team plans for that before the bid.
- Septic and well setbacks blocking the obvious build site. On acreage, the natural spot for an ADU or shop is often too close to the leach field or water line. LA County won’t waive the setback. We pull the septic record and locate the well first, then position the structure around reality.
- Foundation movement from clay soil cycling. San Antonio Heights gets hot, dry summers followed by heavy winter rains, and the expansive clay under these older homes swells and shrinks. That’s why we see so many cracked slabs and sticking doors in 1950s – 1970s ranch homes. Foundation repair or reinforcement often belongs in the scope before a remodel starts.
See the difference
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AfterPricing for General Contractor in San Antonio Heights, CA
What drives pricing here more than the trade work itself is what’s under the ground and how you reach the site. A flatland kitchen or bathroom remodel in San Antonio Heights stays near the regional norm. A kitchen remodel runs $14,000 – $45,000. But once you’re adding square footage, building an ADU, or converting a garage on one of these hillside parcels, the county’s geotechnical triggers and the access logistics move the number. Use these as planning ranges for San Antonio Heights projects:
| Project Type | Typical Cost Range |
|---|---|
| ADU Construction | $90,000 – $220,000 |
| Home Addition | $45,000 – $130,000 |
| Garage Conversion | $30,000 – $80,000 |
Your exact number depends on the soils report, caisson depth, septic and well setbacks, and how long the material haul runs on your driveway. We give you a written, line-item estimate after walking the site. Call (855) 473-6535 to schedule that free estimate.
The San Antonio Heights Acreage Complexity Nobody Quotes
If you own property in San Antonio Heights, you’re building under different rules than your neighbors in Upland or Claremont. Because San Antonio Heights is an unincorporated county island, every building permit goes through LA County rather than a city hall. And the county often requires a geologist’s report on the ancient landslide deposits that underlie the upper slopes, which can add weeks and five figures to a project before a shovel hits dirt. On a terraced lot off San Antonio Heights’ upper slopes, we rebuilt a detached garage into a shop/ADU after the county flagged the original caisson design for being too shallow in landslide debris. Our crew hauled concrete up a narrow, steep driveway in short loads, installed a deeper caisson foundation with a grade beam, and used a Kohler rough-in for the future bath, then walked the owner through the inspection sign-off before closing up the walls. That’s the kind of project flatland general contractors lose money on, and the kind we scope correctly from the start.
On open acreage, the same dynamic applies to outbuildings, shops, and detached ADUs. We start every San Antonio Heights project by locating the septic system and the water well before we draw a line. If your proposed pad encroaches on the leach field or the water line, the county will force a redesign and a new permit round, and that’s a five-figure delay disguised as a small oversight. We treat those setbacks as design constraints, not surprises.
The same goes for grading and drainage. Most San Antonio Heights lots slope enough that water wants to run toward the house during winter storms. We plan for proper swales, retaining walls, and hardscape drainage so the new addition doesn’t steer runoff into the foundation. From the roof down to the pavers, one team owns the whole build.
We Also Serve Cities Near San Antonio Heights
While this page is built for San Antonio Heights, our team regularly works throughout the surrounding foothill communities. We serve San Antonio Heights residents directly, and we also take on projects in Upland, Claremont, Rancho Cucamonga, and Montclair. Each area has its own permitting setup and terrain, but the same full-scope approach applies. If you’re just outside the 91784 ZIP, call us and we’ll let you know how we can help.
Serving San Antonio Heights, CA — Our Local Coverage Area
We’re based here and know this community well, from hillside grading rules to Tremron in San Antonio Heights paver installations. Use the map below to see our service coverage — if you’re nearby, we can almost certainly help.
FAQs About General Contractor in San Antonio Heights
You need an LA County permit, not a city permit, because San Antonio Heights is an unincorporated county island. Every structural addition, ADU, garage conversion, and most remodel projects go through LA County’s Department of Building and Safety. We handle the submittal for you, including any soils reports and structural calculations the county requires. Call (855) 473-6535 for a free estimate and we’ll tell you exactly what permits your project will trigger.
A soil report tells us whether your lot sits on the ancient landslide deposits common along San Antonio Heights’ upper slopes, and it determines foundation depth. If the county geologist flags landslide debris, you’ll need deeper caissons and possibly a grade beam, and we can’t price that accurately without the report. We ask early so your quote reflects reality instead of a change-order surprise. Call (855) 473-6535 and we’ll help you understand where a soils report fits into the sequence and cost.
LA County enforces minimum distances between any new structure and your septic leach field or water well, and those setbacks can eliminate the most convenient build site on your lot. We pull the septic record and locate the well before designing, then position the ADU or shop where the county will actually approve it. That sequencing prevents a forced redesign down the road. Call (855) 473-6535 to have us review your acreage.
On an open San Antonio Heights lot, the geotechnical and access realities usually cost more than the structure itself. A landslide-triggered soils report, deeper caisson foundation, or short-load concrete delivery up a steep driveway can each add tens of thousands of dollars. We factor those items into the quote from the first walkthrough. Call (855) 473-6535 to get a written, line-item estimate for your property.
We write the scope clearly before work begins so changes are the exception, not the norm. When the county requires a revision or you change a finish selection, we price the change in writing and you approve it before we proceed. No surprise change orders, no work done on a verbal handshake. Call (855) 473-6535 to talk through how we manage scope on San Antonio Heights projects.
Ready to Build in San Antonio Heights? Start With the Right Scope.
If you’re planning a remodel, addition, ADU, or outbuilding on your San Antonio Heights property, the first conversation should be about the site, not just the finishes. We’ll walk your lot, review the county’s septic and well records, assess the slope and access, and identify any likely geotechnical triggers before we write a quote. That way the number you see is the number you build to. Call (855) 473-6535 today to schedule your free estimate with our team. We’ll guide you to the right material and scope for your budget, and we’ll manage the whole job start to finish.
Written by Rick Sondermann, Owner at Polaris Contractors, serving San Antonio Heights and the surrounding foothill communities since 2012.