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 Ontario
Finding a General Contractor in Ontario who can handle everything from a kitchen remodel to a full ADU addition is harder than it should be. Most companies specialize in one trade, which leaves you coordinating three or four crews, three or four schedules, and three or four sets of change orders. Polaris Contractors runs the entire scope under one agreement. We work throughout Ontario’s 91762, 91764, 91761, and 91758 ZIP codes, and we’ve spent enough time in these neighborhoods to know what the soil, the housing stock, and the local inspectors will require before we ever open a wall. Call (855) 473-6535 for a free estimate on your project.
Why Polaris Contractors Is Ontario’s Preferred General Contractor Company
Ontario homeowners don’t ask us to be one more subcontractor. They ask us to own the whole job, from the roof down to the pavers. That’s the role Rick Sondermann built Polaris Contractors to fill. We hold one contract, run one schedule, and carry one point of accountability for interior work, exterior work, and prefab ADUs.
Our crews know Ontario’s postwar ranch housing stock. We’ve completed whole-home remodels off Euclid Avenue, kitchen and bath renovations in the neighborhoods north of the 10, and ADU packages near Ontario International Airport. When a 1950s home in the 91761 ZIP needs shear-wall retrofit before a wall can come down, we flag it in the bid so the inspector signs off on the first walk. That’s the difference between a contractor who knows Ontario and one who’s just passing through.
We carry access to 50+ vetted brands, including Therma-Tru for exterior doors and ES Windows and ECO Window Systems for impact-rated installations suited to Santa Ana wind loads. Rick and the whole Polaris team live by one rule: built to the brand’s specification, installed to ours.
Styles & brands we work with
Construction Company in Ontario
A Construction Company in Ontario handles the structural side of your project: room additions, garage conversions, ADU construction, foundation work, and full exterior envelope upgrades. Homeowners in Ontario call us in when a house built in 1962 can’t legally open a load-bearing wall without shear-wall retrofit and foundation bolting, or when a new ADU in the 91762 ZIP needs a full permit package with soil reports and drainage plans before the first footing gets poured. A Home Addition in Ontario runs $45,000 – $130,000. An ADU runs $90,000 – $220,000. A garage conversion typically lands between $30,000 and $80,000. Those numbers assume compliant engineering, not the stripped-down scope a cheap bid leaves out.
ADU and Addition Permitting Support
Ontario has been aggressive about hitting state housing mandates, which means inspectors review ADU submittals harder than they do most other residential permits. We handle the soil report, the drainage plan, the foundation engineering, and the wind-load calculations as part of the quote. Your project, managed start to finish.
Structural Retrofit and Foundation Work
Older Ontario homes, especially the 1950s – 1970s wood-frame ranches built across former agricultural land, often lack foundation bolting. If you want to open up a wall or add square footage, that retrofit has to happen first. We pull the permit, do the bolt-out, and frame rough-in once the inspector clears the retrofitted wall.
Remodeling Contractor in Ontario
A Remodeling Contractor in Ontario takes the home you have and makes it work the way you live now. Kitchens, bathrooms, whole-home updates, and smaller cosmetic upgrades all fall under this. In Ontario, a kitchen remodel typically ranges from $14,000 to $45,000. A bathroom remodel runs $9,000 – $28,000, with a small bathroom landing closer to $5,000 – $12,000. Walk-in shower installations start around $4,500 and can reach $12,000 depending on waterproofing and fixture selection. We guide you to the right material for each budget, whether that’s Cambria quartz on a kitchen island or a Kohler fixture set in a guest bath.
Kitchen and Bath Remodels
Older Ontario homes often have original galvanized plumbing behind the walls, which means water lines get replaced during most kitchen and bath remodels. We include that in the scope. You won’t get a surprise change order the week framing starts.
Whole Home Updates
When a house in the 91764 ZIP hasn’t been touched since the 1960s, a piecemeal remodel creates new problems faster than it solves old ones. We coordinate windows, roofing, interiors, and hardscaping as one project so the exterior envelope and the living spaces actually work together.
Trusted Brands We Service in Ontario
Polaris Contractors installs and services product lines from ES Windows, ECO Window Systems, Mr-Glass, and Therma-Tru for Ontario homeowners. If a southern-exposure wall on a 91762 ranch needs impact-rated glazing to handle Santa Ana wind gusts, we’ll spec ECO Window Systems and verify the wind-load rating before the order hits the fabricator. Ontario customers get direct access to these brands through our trade relationships, which means faster turnarounds on special-order doors and windows than a contractor pulling from a big-box shelf. One team, full scope, with brands you can actually verify.
See the difference
Before
After
Before
After
Before
AfterCommon General Contractor Problems We See in Ontario Homes
- Foundation bolting missing on older ranches: Most 1950s – 1970s homes in Ontario’s 91761 and 91762 ZIP codes were built before seismic code required bolting. Open a load-bearing wall without a retrofit and the inspector will red-tag the framing. We bolt first, then cut.
- Abandoned citrus-grove irrigation lines in 91764: Many postwar homes in the 91764 ZIP sit on former citrus groves. Crews routinely hit buried irrigation lines and organic debris during excavation, which means over-excavation and re-compaction before any new footing passes.
- Santa Ana wind drying and slab subsidence: Ontario’s hot, dry summers plus Santa Ana winds pull moisture from the soil fast. That creates slab cracks and foundation settlement in older homes. We run drainage and site-prep plans as part of every structural quote.
- ADU permits stalled by missing soil reports: Ontario inspectors require soil reports and drainage plans on nearly every ADU submittal. If the bid doesn’t include those, the draw schedule stalls mid-project and you sit with an open hole in your yard.
Pricing for General Contractor in Ontario, CA
Here’s where Ontario pricing actually lands. These are the line items we quote most often for full-scope work in this market:
| Project | Ontario Range |
|---|---|
| ADU Construction | $90,000 – $220,000 |
| Home Addition | $45,000 – $130,000 |
| Garage Conversion | $30,000 – $80,000 |
| Impact Window Installation | $8,000 – $25,000 |
What moves the number? Soil conditions on your lot, whether the house needs shear-wall retrofit or foundation bolting, the wind-load rating required for windows and doors, and the material tier you choose. Our quotes are written line-item so you can see exactly where the money goes. No vague allowances. Call (855) 473-6535 for a free estimate.
We Also Serve Cities Near Ontario
Polaris Contractors works throughout the western Inland Empire, including General Contractor in Ontario neighborhoods as well as Montclair, Upland, Chino, and San Antonio Heights. If you’re just over the city line and need a full-scope contractor, we’ll bring the same team and the same material access to your project.
Serving Ontario, CA — Our Local Coverage Area
We’re based in the Ontario area and know this community well. Use the map below to see our service coverage — if you’re nearby, we can almost certainly help.
FAQs About General Contractor in Ontario
Ontario enforces California Building Code wind-load standards that vary by exposure category and structure height, and the Santa Ana wind corridor pushes many homes into higher-rated zones. Your addition or ADU needs engineering that documents the specific wind-load rating for your lot, plus impact-rated windows and doors if required. A compliant quote includes that engineering. A cheap one skips it until the inspector asks. Call (855) 473-6535 and we’ll walk you through what your specific address needs.
Ontario is pushing hard to hit state housing mandates, so the building department reviews ADU submittals with extra attention on soil reports, drainage plans, and setback compliance. If those documents are missing or thin, the permit stalls. We include the soil report and drainage plan in our ADU scope from day one so the submittal clears without a re-review cycle. Call (855) 473-6535 for an exact quote on your ADU.
A compliant quote includes foundation bolting and shear-wall retrofit where your frame requires it, engineering for wind-load, a soil report and drainage plan where inspectors ask for them, and a permit line item for every phase. A cheap quote leaves those out, then hits you with change orders after work starts. Polaris writes fixed, line-item pricing so you can compare bids honestly. Call (855) 473-6535 before you sign anything.
If an inspector signs off on documented shear-wall retrofit, foundation bolting, and wind-load-rated windows, your insurance company has a paper trail proving the work met code. That strengthens a future claim and can help with premium classification. If the work was unpermitted or undocumented, the insurer may reduce or deny coverage after a loss. We keep every permit, inspection card, and engineering calcs in one folder for you.
In Ontario’s 91764 ZIP, many homes sit on former citrus groves. That means buried irrigation lines, organic debris, and soft fill that crews don’t find until excavation starts. The fix is over-excavation and re-compaction before any new footing gets poured, and that work should be in your bid up front. We’ve hit enough old grove lines in that ZIP to know not to bid it without the contingency. Call (855) 473-6535 and we’ll tell you what your lot likely needs.
Written by Rick Sondermann, Owner at Polaris Contractors, serving Ontario since 2018.