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Toto Construction in Fontana, CA | San Mateo Construction
We provide independent Toto service across Fontana, from fixture-level repairs to full bathroom remodels that involve moving a Toto toilet. The thing that makes our Toto work different here is simple: we read the slab before we quote the fixture. Most Fontana bathrooms built between the 1950s and 1980s sit on concrete slabs that shift with expansive soil, which means a leaking Toto Drake is often a flange problem, not a toilet problem. If you’re dealing with a running Washlet, a weeping bowl, or a full remodel that includes Toto fixtures, call (855) 901-7266 and we’ll take a look. We’re San Mateo Construction, and we’ve been setting Totos on Fontana slabs long enough to know the rough-in is usually the real job.
Why Fontana Residents Choose Us for Toto Service
Noel Carrington founded San Mateo Construction on a straightforward idea: a homeowner should be able to pull one permit, call one contractor, and know that every trade on the job answers to the same person. That’s how we handle Toto service in Bloomington and Fontana. We’re not a factory-authorized shop, and we don’t pretend to be. We’re an independent general contractor that sets Toto Drakes, Ultramaxes, Aquias, and Washlets on the slab tract homes and warehouse TI bathrooms that make up most of Fontana’s housing stock. Noel grew up helping his father pour concrete footings in San Mateo County, studied construction technology at Skyline College, and spent three decades running residential and light commercial jobs before building this company around whole-home contracting. That background matters here because Fontana’s older bathrooms rarely give you a clean rough-in. You need someone who can handle the flange, the drain, the supply stop, and the electrical circuit before the new fixture ever comes out of the box.
Styles & brands we work with
Common Toto Construction Problems We Solve in Fontana
These are the issues we see most often on Toto fixtures in Fontana homes. Each one connects to something local: the soil, the water, the wind, or the age of the housing stock.
- Wax-seal and flange failure from slab movement. Fontana’s expansive soils and shallow mid-century footings shift closet bends over time. A Toto G-Max toilet that looks fine starts weeping at the base, and the fix is a flange repair, not a new toilet. We see this constantly in the 92335 and 92336 ZIP codes.
- Hard Inland Empire water scaling fill valves and flappers. Fontana municipal water carries more mineral content than coastal water. Toto fill valves, flappers, and even CEFIONTECT bowl surfaces pick up scale years earlier here, which shows up as running toilets and weak flushes. The cure is usually a clean OEM replacement part, not a whole new fixture.
- Washlet electronics fouled by dust and scale. The Santa Ana wind corridor pushes fine dust through older Fontana homes, and that dust lands right on Washlet inlet screens and electrical connections. Combine that with hard-water mineral buildup, and the unit keeps throwing errors. We clean the supply path, replace the screen, and verify the circuit before condemning a $600 seat.
- Undersized 1960s supply stops behind Toto one-piece units. A skirted Toto Ultramax II or Neorest looks great, but it hides the rough-in. In Fontana’s 1950s to 1980s slab baths, the original supply stop and cast-iron closet bend are often the weak link. We rebuild the rough-in so the fixture seats cleanly and doesn’t leak at the wall.
- Permit triggers on small bathroom remodels. Move a Toto toilet in an older Fontana home, and the building department may require foundation and moisture testing before the permit clears. We handle that testing as part of the job so you’re not stuck holding an open permit.
Toto Service in Fontana: What Local Conditions Mean for Your Equipment
A lot of Fontana’s mid-century slab homes around the old steel-mill neighborhoods were built fast on shallow footings. That’s not a rumor; it’s what we find when we open up a 1961 hall bath off the steel-mill side of 92335. On one job, our crew pulled a leaking Toto Drake during a remodel and found the closet flange cracked and the slab slightly out of level from expansive-soil movement. We broke out and reset the flange, brought the supply stop up to current code, added moisture testing to clear the permit, and set a new Drake II on a reinforced wax seal. A fixture swap turned into a slab-and-flange job. That’s Fontana. Even a small bathroom remodel that moves a Toto toilet frequently triggers unexpected foundation and moisture testing before the building department will clear the permit, a step most Inland Empire bathroom jobs—and Rialto Toto service calls—never see. If you own a home near the old Kaiser steel plant footprint, expect this. It’s not a problem you caused, and it’s not something a generic Toto page will ever mention.
Toto Models & Products We Service in Fontana
We work on the full Toto lineup: Drake and Drake II two-piece toilets, Ultramax II one-piece units, Aquia dual-flush models, Washlet seats from the C100 through S500 series, and Neorest integrated toilets. For parts, we use OEM Toto fill valves, flappers, and gaskets on Washlets and one-piece units where an off-brand part will void performance or change the flush character. For wax rings, supply lines, and offset flanges, we’ll use quality aftermarket components where it genuinely doesn’t matter. We tell Fontana owners straight: a 15-year-old Drake that only needs a $30 flapper shouldn’t get a $500 replacement. But when a slab flange rebuild makes a new toilet the cheaper long-run call, we say that too. For broader Toto work and full bathroom projects, see Toto sales & service for what we cover.
See the difference
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AfterToto Service Pricing in Fontana
What you’ll pay depends on whether we’re repairing a fixture or rebuilding the bathroom around it. Here are the line-item ranges we quote across Fontana:
| Service | Price Range |
|---|---|
| Bathroom Remodel | $9,000 – $28,000 |
| Small Bathroom Remodel | $5,000 – $12,000 |
| Walk-In Shower Installation | $4,500 – $12,000 |
| Tub-to-Shower Conversion | $3,500 – $10,000 |
| Shower Replacement | $3,000 – $8,500 |
| Bathroom Vanity Installation | $800 – $3,000 |
The cost drivers in Fontana are usually the rough-in and the permit path. A Toto fixture swap on a 1990s slab in 92337 is a different job than a Toto swap on a 1962 slab in 92335, where the flange and supply stop may both need rebuilding. Our free estimate includes a look at the drain, the flange, the supply line, and the electrical circuit so the number we quote is the number you’ll pay. Call (855) 901-7266 and we’ll come out and price it.
Serving Fontana, CA — Our Local Coverage Area
We’re based in the Fontana 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 – Toto Construction in Fontana
Usually not. In Fontana’s older slab homes, the leak is almost always the wax seal or the closet flange underneath the toilet. The soil here expands and contracts, which shifts the slab and cracks flanges. We remove the toilet, inspect the flange, and rebuild it if needed. If the toilet itself is fine, you’re paying for a repair, not a replacement. Call (855) 901-7266 and we’ll confirm what’s actually leaking.
No, a Washlet seat generally fits a standard Toto elongated bowl, including most Drakes and Ultramaxes. What you do need in an older Fontana bath—or a Glen Avon Toto service call—is a GFCI-protected outlet near the toilet and a supply connection that isn’t corroded from scale and dust. We check both before you buy the seat so you’re not stuck with a Washlet that throws errors on day one. Estimates are free.
Hard municipal water is the usual culprit. Mineral scale builds up on the fill valve and flapper, which prevents a clean seal and makes the tank refill on its own. Fontana water does this faster than softer coastal water. We replace the worn parts with OEM Toto components, which typically restores the flush and stops the running. Call (855) 901-7266 for an exact quote.
Not necessarily. Many tub-to-shower conversions keep the toilet in place, especially when the tub and toilet share the same wet wall. But if the shower footprint needs to expand into the toilet’s space, moving the toilet on an older Fontana slab—like we’d see on a Pedley Toto service job—can trigger foundation and moisture testing before the permit clears. We’ll tell you during the estimate whether the toilet stays or moves, and what that does to the timeline. Estimates are free.
Probably, if the home is from the 1950s to 1980s and the toilet or drain moves. Fontana building officials know the shallow-footing history around the old steel-mill neighborhoods, and they often require moisture and foundation checks before clearing a bathroom permit. We handle that testing as part of the job. Call (855) 901-7266 and we’ll tell you what your specific street and slab will trigger.
Service Areas Near Fontana
We serve all Fontana ZIP codes, including 92337, 92331, 92334, and 92335, plus the newer subdivisions in northern 92336. We also handle Toto work across the Fontana service area and into nearby communities. For Toto fixture work east of here, see Toto service in Eastvale. North of the 210, take a look at Toto service in Muscoy. Tell me what you actually need, and we’ll figure out the right way to build it.
Book Your Toto Service in Fontana Today
If your Toto toilet, Washlet, or bathroom rough-in needs attention in Fontana, call (855) 901-7266 to schedule your free estimate. We’ll look at the slab, the flange, the drain, and the circuit, then give you a written number that includes the parts and the permit path.
Written by Noel Carrington, Owner at San Mateo Construction, serving Fontana, CA.