Fast, Reliable Bathroom Remodeling Across San Antonio Heights
Bathroom remodeling in San Antonio Heights typically runs $18,000 to $45,000 for a full hall bath, and the wildcard is rarely the tile or the vanity. It is the county permit, the cast-iron drain under a 60-year-old slab, or a hillside where the old sewer line now fights the grade. We know because we have pulled permits and passed inspections on those exact jobs. If you are planning a bathroom remodel in San Antonio Heights, call us at (855) 617-6356 and we will walk you through what actually moves the price before you spend a dime.
Why Holloway ADU Builders Is San Antonio Heights’s Preferred Bathroom Remodeling Company
Most remodelers in the Inland Empire think of San Antonio Heights as Upland. It is not. It is an unincorporated San Bernardino County island, which means your bathroom remodel answers to the County of San Bernardino, not Upland’s building department. We have pulled bathroom permits through the County for homes on Beverly Drive, Euclid Avenue, and 24th Street, and we know the plan-check quirks that stall contractors who don’t work here regularly.
Our lead, Neil Trescott, has scoped bathroom remodels on the large estate-style lots that define San Antonio Heights, where detached garages, shops, and older ranch homes are the rule. Those properties have cast-iron drains, slab-on-grade foundations, and hose bibs that predate modern backflow rules. We scope for that reality from the first walkthrough, not after the tile is ordered.
We are an ADU-first builder, which matters more than you might think for a bathroom. Many San Antonio Heights bathrooms live inside or adjacent to a detached ADU, a garage-top ADU, or a conversion. That means the bathroom scope has to coordinate with County wildland-urban interface fire rules, septic and well setbacks, and drainage review. A general contractor who mostly builds kitchens in Rancho Cucamonga has not seen that stack of requirements. We have.
Our Bathroom Remodeling Services in San Antonio Heights
We handle the full spectrum of Bathroom Remodeling, but three scopes come up most often in San Antonio Heights because of the housing stock and County rules.
Detached ADU Bathroom Remodels
Many San Antonio Heights properties already have a detached ADU, a converted garage, or a shop with living quarters. When the bathroom in that structure needs work, you are often dealing with two separate permit paths: one for the ADU itself and one for the bathroom scope. We scope both at the start so the rough-in inspection does not stall while the County asks for fire-rated vent terminations or eave soffit details you were never told about.
Garage-Top ADU Bathroom Remodels
Garage-top ADUs on the larger San Antonio Heights parcels bring a specific plumbing reality: the bathroom drains have to make a long, often steep run down to the sewer or septic line. On a hillside lot off Beverly Drive, we ran a new ABS drain from a garage-top bathroom down through the existing wall chase and into a sump pit because the original slope made a gravity run impossible without trenching the driveway. That is the kind of scope item you want priced before demo starts.
Conversion ADU Bathroom Remodels
If your San Antonio Heights bathroom is part of a converted garage or workshop, the original slab may not have been poured with bathroom plumbing in mind. We commonly chip out a trench for a new drain line, add a vent that meets County code, and bring the wet wall up to current standards. Tuff Shed conversions are a big part of what we do, and the bathroom finish is where those projects either come together or fall apart.
Full Hall Bath and Primary Bath Remodels
Inside the main house, the mid-century ranches of San Antonio Heights usually have compact hall baths with original cast-iron tubs and tile-on-mud walls. We replace the drain, reframe the wet wall, and rebuild with modern waterproofing systems while keeping the permit clean with the County. Primary bath additions are also common on these large lots, where the existing footprint has room to expand into a closet or unused hallway.
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
We are brand-agnostic, so we are not steering you to a single manufacturer. For bathroom work tied to ADU projects, we routinely work with Mighty Buildings, Boxabl, and Plant Prefab panels and fixtures. We also handle Tuff Shed conversions where the bathroom is built out inside a converted shell. If you have a specific fixture or panel brand in mind, we will tell you honestly whether it fits your San Antonio Heights lot and County permit path, not whether it pads a dealer margin.
Common Bathroom Remodeling Problems We See in San Antonio Heights Homes
- Cast-iron drains bellied under slab-on-grade foundations. The 1950s and 60s ranches in San Antonio Heights were built with cast-iron waste lines that eventually rust or settle. On a recent hall bath remodel off Beverly Drive, the original cast-iron drain had bellied under the slab, so we broke out the concrete, replaced the run with ABS, and added a curbless shower with a linear drain tied to a new sump pit.
- County plan check treats the job differently than Upland would. Because San Antonio Heights is unincorporated, the County of San Bernardino reviews fire-safe construction standards, vent terminations, and eave soffit details that Upland’s building department would not flag. Out-of-area builders get rough-in inspections delayed when they miss these.
- Hillside grading changes the plumbing path. Lots that slope down toward the valley often need retaining walls or re-graded soil before a bathroom addition can tie into the existing sewer line. We scope grading and drainage before we quote, not after excavation starts.
- Wildland-urban interface fire code applies to bathroom vent terminations. On any detached ADU bathroom, the vent termination has to meet WUI standards for ember intrusion, and eave soffits need the right detailing. Miss it and you fail final inspection. We do not miss it.
Pricing for Bathroom Remodeling in San Antonio Heights, CA
A hall bath remodel in San Antonio Heights typically runs $18,000 to $30,000 when we are replacing the tub with a walk-in shower, swapping the vanity and toilet, re-tiling the floor and walls, and keeping the existing footprint. A primary bath with a larger footprint, dual vanity, and curbless shower runs $30,000 to $45,000. Detached ADU bathrooms land in a similar range but can go higher when we’re adding a new drain run, a sump pump, or fire-rated vent details. County permit fees, plan check, and any grading or retaining wall work are additional and scoped line-by-line. Call (855) 617-6356 and we will give you a written estimate based on your actual lot, not a square-foot multiplier.
We Also Serve Cities Near San Antonio Heights
While this page focuses on Bathroom Remodeling in San Antonio Heights, our crews regularly work in Upland, Claremont, Rancho Cucamonga, and Montclair. If your property sits near the county line or you have questions about which jurisdiction applies, call us. We will tell you straight.
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 – Bathroom Remodeling in San Antonio Heights
Yes. San Antonio Heights is an unincorporated San Bernardino County island, so a bathroom remodel inside an existing home requires a County of San Bernardino building permit. If the bathroom is inside a detached ADU, separate permits for the ADU and the bathroom may apply, and that adds plan-check time. We handle the permit drawings and County submittal for you, so you are not navigating that alone. Call (855) 617-6356 to have us scope the permit path first.
The WUI fire code affects bathrooms in detached ADUs and any exterior wall or vent penetration, not typically a bathroom in the main house. Bathroom vent terminations in detached structures need ember-resistant covers, and eave soffit details on the ADU have to meet WUI standards before the County signs off final inspection. We coordinate those details with the bathroom scope so one does not fail the other. Call (855) 617-6356 for a walkthrough that includes the fire-code check.
Yes, and it is more common than people expect. Many proposed bathroom additions on sloped lots need pad grading or a retaining wall before the new floor can tie into the existing drain line. County drainage review is the usual bottleneck. We scope grading before we quote so the price does not move mid-job. Call (855) 617-6356 if you want a level read on your lot.
The most common issue is a cast-iron drain that has bellied or cracked under a slab-on-grade foundation in a 1950s or 60s ranch. We also see old galvanized supply lines that need replacement and shower valves that fail current code. On a hillside lot, the sewer line may have shifted with the slope, which changes where the new bathroom can sit. We inspect for these before we quote. Call (855) 617-6356 to schedule that inspection.
If your San Antonio Heights property is on septic and well, the County requires setbacks between the bathroom’s new plumbing runs and the septic tank, leach field, and wellhead. A bathroom addition that violates those setbacks will not pass plan check. We map the setbacks early and adjust the bathroom footprint accordingly. Call (855) 617-6356 and we will check your lot’s constraints before you sign anything.
Call (855) 617-6356 to schedule your free bathroom remodeling estimate in San Antonio Heights. Neil Trescott and the Holloway ADU Builders crew will scope your lot, your permit path, and your real price before any demo hammer swings.
Written by Neil Trescott, Owner at Holloway ADU Builders, serving San Antonio Heights and the surrounding county areas since the company’s founding in Tustin.