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
If you’re planning a remodel, addition, or ADU in San Antonio Heights, you need a contractor who understands that this isn’t flatland building. Sloped lots, decomposed granite, county-level permits, and wildfire exposure change how every project gets scoped and priced. Toolbox Contractors handles all of it – kitchens, bathrooms, roofs, windows, fences, hardscape, and full ADU construction – under a single contract. We work across San Antonio Heights from the Euclid Avenue corridor up to the foothill roads, and we answer the phone at (855) 382-3257. Call us and you’ll reach a person who knows your terrain, not a call center.
Why Toolbox Contractors Is San Antonio Heights’s Preferred General Contractor Company
We’ve earned a reputation in San Antonio Heights for doing the unglamorous work right: soils reports, grading plans, drainage swales, County submittals. Homeowners here don’t call us because they want a generic kitchen refresh. They call because they have a steep lot off Ridge Road, or a mid-century ranch that needs structural work before the fun finishes can start, or an acreage parcel where they want a detached ADU for family. We bring the same team to every phase – demolition, foundation, framing, finishes, roofing, hardscape – so you’re not coordinating five crews with five schedules and five opinions. One contractor, one point of accountability, from the cabinets to the roof. Norm Castellano built the company around that idea, and it’s why San Antonio Heights homeowners keep our number close.
Styles & brands we work with
Remodeling Contractor in San Antonio Heights
A remodeling contractor in San Antonio Heights is dealing with a different animal than one working the flat streets of Upland or Rancho Cucamonga. The older ranch homes along the foothill roads often hide original plumbing, load-bearing walls that weren’t framed for open concepts, and foundations that have shifted on decomposed granite. Before we quote a kitchen or bathroom remodel in 91784, we look for what the walls and slope will tell us – because that determines whether the job stays within allowances or spirals. A typical kitchen remodel in San Antonio Heights runs $14,000 to $45,000 depending on cabinetry grade, countertop material, and whether we’re moving walls. Bathrooms land between $9,000 and $28,000.
Structural Upgrades During a Remodel
When we open up a wall on a hillside home and find termite damage or a header that should never have carried that load, the scope changes. We handle that in-house. The same crew that frames the new kitchen island can sister the joists and replace the beam. You get a written line-item quote before we start, so you see exactly what structural work costs and why.
Material Selection with 50+ Vetted Brands
We install KraftMaid and Wellborn cabinets, Cambria and Caesarstone countertops, Kohler and Moen fixtures, and Schluter tile systems. If your budget is tighter, we stock Delta and American Standard lines that still carry real warranties. For a San Antonio Heights kitchen, we’ll help you pick finishes that stand up to dry foothill air and frequent cooking heat – no warping, no delamination.
Licensed General Contractor in San Antonio Heights
A licensed general contractor in San Antonio Heights has to carry the full burden of County of San Bernardino Building and Safety requirements, because this is unincorporated land. That means no city counter to walk into, no city inspector to sweet-talk. County submittals, soils reports, fire-safety reviews, and drainage plans all move through the same jurisdiction that governs the unincorporated foothills. We pull permits, schedule inspections, and handle the paperwork so the project doesn’t stall. For additions and ADUs, expect real engineering review. A home addition in San Antonio Heights runs $45,000 to $130,000, while a full garage conversion lands between $30,000 and $80,000.
County Permits and Soils Reports
The County routinely asks for a soils report before approving foundation or retaining-wall plans on sloped lots. We budget for that from day one and write it into the quote. If a contractor quotes you a hillside addition without mentioning a soils report, that’s a red flag – the County will not sign off on the foundation until one is in hand, and your draw schedule stalls while you wait.
Hillside Drainage and Erosion Control
Winter rains on graded lots move fast. If we don’t route runoff correctly, it ends up on your neighbor’s slope and you get a County complaint. We design drainage swales, French drains, and retaining-wall tie-backs into every hillside scope. It costs more up front than a flat-lot formula, but it prevents rework that costs five times as much after the next storm.
Trusted Brands We Service in San Antonio Heights
We maintain partnerships with the brands homeowners in San Antonio Heights actually ask for by name. Abodu and Boxabl give us prefab ADU capability that most general contractors in the Inland Empire don’t offer – and that matters when you’re building a detached unit on acreage with a long material haul. For concrete and site work, we use Quikrete and Sakrete products that hold up to the hot, dry summers and occasional freeze cycles here. For roofing on wildland-urban interface lots, we’re certified to install GAF, CertainTeed, and Owens Corning systems that meet fire-resistant assembly standards. You won’t get a generic catalog from us. You’ll get specific materials, priced line by line, with real warranties behind them.
See the difference
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AfterCommon General Contractor Problems We See in San Antonio Heights Homes
- Old ranch foundations on decomposed granite. Homes built in the 1950s and 1960s were rarely engineered for the soil movement common on these foothill lots. We often find cracked stem walls and settling that require piering or full-width footing reinforcement before any remodel makes sense.
- Load-bearing walls that weren’t built for open concepts. The mid-century layout with a walled-off kitchen is charming until you want to see your guests from the stove. Removing that wall often means adding a beam and post, plus a structural engineer’s stamp for the County.
- Drainage that dumps onto a neighbor’s slope. On lots off Euclid and the ridge roads, runoff from a poorly graded backyard can trigger a Code Enforcement complaint fast. We design positive drainage before we ever pour a patio or build a retaining wall.
- Wildfire-resistant assemblies on older roofs. Homes along the wildland-urban interface need Class A roofing, ember-resistant vents, and sometimes defensible-space clearing before we can even start an exterior remodel. We fold that into the scope so you’re not surprised by a fire-safety review.
Pricing for General Contractor in San Antonio Heights, CA
Here’s what we quote for the most common scopes we build across San Antonio Heights and the surrounding foothills. These are real numbers based on our recent work in the 91784 ZIP, not online calculators. Sloped lots add foundation and drainage scope. Long material hauls add labor. Fire-resistant assemblies add material cost. We show all of it in a line-item estimate before you sign anything.
| Project | Typical Range in San Antonio Heights |
|---|---|
| ADU Construction | $90,000 – $220,000 |
| Home Addition | $45,000 – $130,000 |
| Garage Conversion | $30,000 – $80,000 |
| Kitchen Remodel | $14,000 – $45,000 |
| Bathroom Remodel | $9,000 – $28,000 |
| Roof Replacement | $8,000 – $20,000 |
The wildcard is always the soil. If the County requires a soils report, that’s an extra $2,500 to $5,000 before you even break ground, and the report may change your foundation design. We tell you this up front. Call (855) 382-3257 to schedule a free estimate, and we’ll walk your property in San Antonio Heights before we put a single number on paper.
We Also Serve Cities Near San Antonio Heights
Our crews work throughout the upper San Gabriel Valley and the Inland Empire foothills. If you’re in Upland, Claremont, Rancho Cucamonga, or Montclair, you’ll get the same full-scope approach we bring to San Antonio Heights. For more on our broader footprint, see our General Contractor service page. If you’re comparing local options, start with General Contractor in San Antonio Heights to understand how we price and scope work in this specific area.
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
Yes, in most cases on sloped lots. The County of San Bernardino routinely requires a soils report before approving foundation or retaining-wall plans in San Antonio Heights, especially where we’ve hit decomposed granite or variable fill during excavation. Expect to add $2,500 to $5,000 and a two-to-four-week turnaround. We write this into every hillside quote so it doesn’t surprise you later. Call (855) 382-3257 for an exact estimate on your lot.
County review moves slower and digs deeper on soils, drainage, and fire-safety. San Antonio Heights is unincorporated, so we submit everything through County of San Bernardino Building and Safety instead of a city counter. Inspections are scheduled through the County’s rotation, which can add days to a schedule. We handle the submittals, the resubmissions if needed, and the inspection calls. That’s part of what you’re paying a General Contractor to manage.
A detached ADU in San Antonio Heights runs $90,000 to $220,000 depending on size, foundation type, site access, and finish level. Long material hauls and steep driveways push labor costs up. If you go with a prefab system like Abodu or Boxabl, the structure arrives faster but still needs site work, utilities, and County approvals. Call (855) 382-3257 to get a scoped estimate for your parcel.
We design positive drainage and route runoff away from property lines. That means grading away from the foundation, installing French drains where needed, and building swales or berms that keep stormwater on your parcel. On a Steep lot off Ridge Road, we built a detached ADU where a drainage swale kept runoff from reaching the neighbor’s slope – the County signed off without issue, and the neighbor stayed happy. We’ll do the same on your lot. Call (855) 382-3257 for a drainage assessment.
Sometimes yes, sometimes no. We inspect first – before quoting – so you know exactly what’s behind the walls. Older ranch homes here often have load-bearing walls we need to reinforce, original cast-iron plumbing that’s failing, and framing that didn’t anticipate an open plan. We write those upgrades into the scope as line items, not change orders. If you want a kitchen remodel in San Antonio Heights without surprises, get the walls opened on paper first. Call (855) 382-3257.
Class A fire-rated roofing, ember-resistant vents, non-combustible or ignition-resistant siding, and defensible-space planning around the structure. On a wildland-urban interface lot in San Antonio Heights, the County fire marshal reviews these details during permit. We install GAF, CertainTeed, and Owens Corning assemblies that meet the standard, and we use James Hardie siding that carries a real fire-resistance rating. These details cost more than standard materials, but they’re non-negotiable on these foothill lots. Call (855) 382-3257 and we’ll walk your property with you to identify what your home needs.
Written by Norm Castellano, Owner at Toolbox Contractors, serving San Antonio Heights and the San Bernardino County foothills.