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
Hiring a general contractor in San Antonio Heights means contending with steep foothill lots, stacked county permit reviews, and homes that were never built to modern code. We know this territory because we work it constantly. Whether you’re planning a kitchen remodel, a roof replacement, or an ADU on an irregular hillside parcel, our team handles the full scope without the subcontractor shuffle. Call (855) 473-5620 to schedule a free estimate, and we’ll send someone who’s actually walked San Antonio Heights streets, not a sales rep reading from a brochure.
Key Takeaways
- San Antonio Heights sits on unincorporated foothill land, so one project can trigger county building, fire (WUI), and grading/drainage review at the same time.
- Steep, sloped lots make retaining walls and drainage structural-life-safety items, not afterthoughts.
- A home addition in San Antonio Heights typically runs $45,000 – $130,000; an ADU ranges $90,000 – $220,000.
- We manage every phase, from GAF-certified roofing to Cambria quartz countertops to Belgard paver patios, under one contract.
Styles & brands we work with
Why San Bernardino Contractors Is San Antonio Heights’s Preferred General Contractor Company
We’re led by Ruben Castillo, who understands that San Antonio Heights isn’t Upland. It’s an unincorporated foothill community above the San Bernardino Valley, where homes sit on canyon-edge parcels with wildland-urban interface code requirements that flat-lot contractors never see. When you call us, you’re calling a team that has pulled county permits here, dealt with slope drainage review here, and rebuilt retaining walls here. That local knowledge shows up in our quotes, our schedules, and our inspection outcomes.
Our customers in San Antonio Heights consistently mention two things: we show up when we say we will, and we don’t hide behind subcontractors when something goes sideways. Because we’re a General Contractor with one contract and one point of accountability, you’re never stuck playing phone-tag between a roofer, a cabinet shop, and a grading sub. We handle the whole scope, from the roof down to the pavers.
Response time to San Antonio Heights is straightforward: we schedule estimates within the week, and we stage carefully because we know how tight the streets and driveways get on the canyon-edge lots above the valley. If you’re in the 91784 ZIP, give us a call. We know the terrain.
Hire a General Contractor in San Antonio Heights
Hire a General Contractor in San Antonio Heights when your project touches more than one trade, which almost everything on these foothill lots does. A kitchen remodel might require structural retrofitting. A room addition might trigger grading review. A roof replacement might need fire-rated decking and defensible-space compliance. Coordinating three separate specialists on a sloped parcel with constrained access is where projects stall and budgets blow out. One contractor owning every phase changes that math.
Typical project costs in this market reflect the terrain. A home addition in San Antonio Heights runs $45,000 – $130,000, depending on foundation work, retaining needs, and finish level. A garage conversion runs $30,000 – $80,000. An ADU runs $90,000 – $220,000, and that range widens fast when the hillside lot requires extra grading and drainage work.
Hillside Foundations and Retaining
Steep lots dominate San Antonio Heights, and many homes were built decades ago with foundation systems that don’t meet current seismic or drainage standards. We assess slope stability before we ever open a wall.
Party-Wall and Neighbor Notice
On tightly packed foothill parcels, demolition near a shared property line demands written notice and careful staging. We handle that before it becomes a dispute.
General Contractor Services in San Antonio Heights
General Contractor Services in San Antonio Heights span the full residential scope, because these homes don’t need just one thing fixed. You might start with a bathroom remodel and discover the subfloor needs repair, the window flashing is failing, and the exterior siding on the canyon-facing side is dry-rotted. We handle all of it under one contract, with access to over 50 named brands across cabinetry, countertops, plumbing, roofing, windows, fencing, and hardscaping, including Tremron in San Antonio Heights.
You pick the brand, we handle the build. Want Kohler fixtures in the bath and Grohe in the kitchen? That’s fine. Want CertainTeed roofing on the main house and a Belgard paver patio off the kitchen? Done. We don’t steer you toward generic “contractor grade” materials unless that’s what you actually want.
Foundation and Drainage Work
On sloped parcels, water moves downhill toward the valley, and it takes soil and foundation integrity with it. We plan grading and drainage as part of the remodel, not as a change order after the fact.
Fire-Defensible Retrofit
San Antonio Heights sits in a high fire-severity zone. Ember-resistant roofing, fire-rated siding, and defensible-space-compliant rebuilding aren’t optional add-ons here. They’re part of getting the permit closed.
What happens when you call
- 1
A real person answersNo phone trees — you reach a local pro.
- 2
You get an upfront price rangeHonest numbers before anyone is dispatched.
- 3
A background-checked tech heads outLicensed & insured, dispatched right away.
- 4
You approve before work beginsNothing starts until you say go.
Trusted Brands We Service in San Antonio Heights
We’re authorized to work with 50+ named brands across every trade category, so San Antonio Heights homeowners choose their finish level, from builder-grade to ultra-premium. Roofing systems from GAF and CertainTeed cover six of the industry’s most trusted shingle manufacturers. Plumbing fixtures from Grohe and Sterling cover every price point and design aesthetic. We stock common parts and have direct supply relationships, which means fewer delays when a San Antonio Heights job needs a specific component mid-project. No generic “quality materials” claims here. You name the brand, we build it.
See the difference
Before
After
Before
After
Before
AfterCommon General Contractor Problems We See in San Antonio Heights Homes
- Bidding hillside work as flat-lot work. A contractor who ignores slope stability, retaining walls, and drainage underbids the job and then hits you with change orders halfway through. We price the terrain from day one.
- Skipping written party-wall and neighbor notice before demo. On these tightly packed foothill parcels, a routine remodel turns into a dispute fast when demolition starts without warning. We send written notice and keep the lot swept daily.
- Treating county permits as one approval. In unincorporated San Antonio Heights, a single project can stack building, WUI/fire, and grading/drainage review. Contractors who don’t plan for that stall your draw schedule.
- Decades-old additions and outbuildings that don’t match original construction. Matching non-standard original framing, rooflines, and materials on a mid-century foothill custom home is a recurring challenge. We’ve done it enough to know what to look for.
Pricing for General Contractor in San Antonio Heights, CA
Here are the actual numbers for major projects in this market. These ranges reflect what we see on sloped, unincorporated foothill lots, not a flat tract in Upland.
| Project | Typical Range |
|---|---|
| Home Addition | $45,000 – $130,000 |
| ADU Construction | $90,000 – $220,000 |
| Garage Conversion | $30,000 – $80,000 |
What moves the price? Slope stability and retaining needs, drainage requirements, WUI fire code compliance, and access for staging and equipment. A steep canyon-edge lot with a failing retaining wall will land at the higher end. A moderate slope with good driveway access will land lower. We give written, line-item quotes on every estimate, and estimates are free. Call (855) 473-5620 to schedule one.
On a canyon-edge street off the foothill grid above the valley, we took on a remodel of a mid-century custom home with a decades-old addition and a failing hillside retaining wall behind it. Our crew staged materials in the driveway because there was no flat side yard, pulled the county grading and drainage review alongside the structural scope of work, and rebuilt the wall and re-routed slope drainage before framing the addition. We gave the downhill neighbor written notice before demo and kept the lot swept daily. The structural retrofit and fire-rated siding closed out with inspection sign-off on schedule.
We Also Serve Cities Near San Antonio Heights
From our base in Fontana, we work regularly in San Antonio Heights and the surrounding communities. That includes Upland directly below, Claremont, Rancho Cucamonga, and Montclair. Each has its own permit office and terrain, and we know the differences. General Contractor in San Antonio Heights work is our focus on this page, but we’re active across the whole foothill corridor.
Serving San Antonio Heights, CA — Our Local Coverage Area
We’re based in the San Antonio Heights 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 San Antonio Heights
A San Antonio Heights remodel costs more to permit because the community sits on unincorporated county land, which means building, fire (WUI), and grading/drainage review stack on top of each other for a single project. In Upland, the city handles most of that through one department. Here, you’re often pulling three approvals before we open a wall, and that review time and documentation shows up in the permit fees and the schedule. Call (855) 473-5620 and we’ll walk you through what your specific project triggers.
We send written party-wall and neighbor notice before any demolition starts, especially on steep canyon-edge streets where a downhill neighbor’s home could be affected by debris, drainage changes, or vibration. We also stage materials to avoid blocking shared access and keep the lot swept daily. This isn’t optional on tight foothill parcels. It’s how we keep a routine remodel from turning into a dispute. Call (855) 473-5620 to discuss your specific lot layout.
Yes, you can build an ADU or addition on a steep San Antonio Heights parcel, but the scope changes significantly compared to flat ground. You’ll likely need slope stability analysis, retaining walls, and engineered drainage before the structure goes up. We pull the grading and drainage review alongside the building and fire review, so the permit set moves as one package instead of stalling. ADU construction here typically runs $90,000 – $220,000. Call (855) 473-5620 for a parcel-specific assessment.
An addition needs a change order when the work was in scope but conditions changed, like discovering a failing retaining wall or non-standard framing that requires structural retrofit. It needs a new quote when the homeowner changes the project, like adding a bathroom or upgrading to Cambria quartz throughout. Either way, you’ll know the number before the work starts, never after the fact. Call (855) 473-5620 and we’ll explain how we handle both.
Tight lot access affects your quote through staging, material handling, and equipment choice. On a canyon-edge street with no flat side yard, we stage materials in the driveway or coordinate just-in-time deliveries, which adds a logistics line to the estimate. It’s not padding. It’s the real cost of working on a constrained foothill parcel. Call (855) 473-5620 and we’ll price your actual access situation, not a generic flat-lot assumption.
Get a Free Estimate From a San Antonio Heights General Contractor
If you’re planning a remodel, addition, ADU, roof replacement, or exterior transformation in San Antonio Heights, call (855) 473-5620 to schedule a free estimate. We’ll walk the lot, assess the slope and drainage, review the county permit triggers, and give you a written, line-item quote. One contractor, every phase. From the roof down to the pavers.
Written by Ruben Castillo, Owner at San Bernardino Contractors, serving San Antonio Heights and the surrounding foothill communities.