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
Toto Construction in Ontario, CA
Sundance Contractors provides independent Toto construction and installation service across Ontario, CA, and nearby communities including Toto service in Montclair, covering the 91762, 91764, 91798, and 91758 ZIP codes. What makes our Toto work different here is simple: Ontario’s hard water and expansive clay soils create specific failure patterns on Toto’s high-efficiency lines, and we’ve been fixing them long enough to know what actually breaks. Noel Carranza and our crews handle everything from full bathroom remodels built around Toto fixtures to same-day valve and flange repairs. If you’re dealing with a rocking Drake or a Washlet throwing codes, call (877) 752-3951 for a straight answer.
Why Ontario Residents Choose Us for Toto Service
Full-scope general contracting changes how Toto work gets done. Most Ontario homeowners end up juggling a plumber for the rough-in, a separate tile crew for the shower pan, and maybe an electrician for the Washlet circuit. We’re one crew carrying the whole scope, which means your Toto rough-in, waterproofing, tile, and trim all happen under one contract and one inspection schedule. Our crews have installed and serviced Toto’s gravity-flush and high-efficiency lines for years in Ontario’s master-planned communities and mid-century tract homes, plus Toto repair in Chino, so we know how they behave under Inland Empire hard water and hot-dry swings. We work as an independent Toto specialist – not authorized by the manufacturer – and stand behind our own workmanship on every repair and replacement. That independence means we spec parts based on what holds up in Ontario’s conditions, not what a manufacturer program tells us to push.
Noel grew up in Yorba Linda, working alongside his father on framing crews before studying construction technology at Fullerton College. His approach carries through every project we touch: use the right part, set it correctly, and don’t walk away until the job is watertight and code-clean.
Styles & brands we work with
- Kitchen remodeling
- Bathroom remodeling
- Home additions & ADU
- Roofing
- Windows & doors
- Driveway & pavers
- Fence
Common Toto Construction Problems We Solve in Ontario
- Hard-water-scaled fill valves and flappers on Drake toilets. Ontario’s ground water deposits mineral scale quickly, so tanks that run constantly or refill slowly are usually a scaled fill valve and hardened flapper, not a dead toilet. We swap in OEM Toto fill valves and flappers, which keeps the flush path in factory spec instead of fighting an aftermarket part that never seats quite right.
- Rocking, leaking Toto bowls on mid-century slab homes. The expansive clay under Ontario’s 91762 and 91764 tract houses moves seasonally, and that movement cracks wax rings and loosens closet flanges. If your Toto Drake or Ultramax II shifts when you sit down or stains the floor at the base, the flange is almost always the culprit, not the bowl. We reset the flange, install an OEM wax seal, and shim the bowl level so it stays put through the next wet-dry cycle.
- Washlet control panels and seats dead after voltage dips. Ontario’s older neighborhoods carry the heat load and voltage sags that come with hundred-degree summers and occasional Santa Ana wind events. S350e and C-series Washlet seats sometimes throw error codes or lose their control panel after repeated brownouts or heat cycling in garages and humid bathrooms. We troubleshoot the power supply and control board before recommending replacement, and swaps are done with OEM components.
- Ultramax II tank-to-bowl gasket seepage. One-piece Toto Ultramax II toilets hold up well, but the gasket between tank and bowl can seep after years of hot-dry swings and wind-driven temperature shifts off the Cajon Pass. We replace the gasket and bolts rather than condemning the whole fixture – this repair usually costs a fraction of a new toilet.
- Flange failures under converted infill and tract homes. Ontario’s new construction on former citrus and dairy land is going up fast, but the grading and compaction on some infill lots settles unevenly in the first few seasons. We’re seeing flange height issues and offset rough-ins on newer Toto installs where the slab has moved after the build. Shimmed flange repairs and code-correct offsets handle it cleanly.
Toto Service in Ontario: What Local Conditions Mean for Your Equipment
Ontario’s ground water runs hard enough that Toto’s high-efficiency 1.28 GPF toilets scale their fill valves and washlet inlet screens noticeably faster than in softer-water markets, so descaling and early valve replacement are routine maintenance here rather than a one-time fix. That single fact changes the service math: a Drake in Ontario that still flushes but refills slowly is a fifteen-minute OEM valve swap, not a replacement conversation. Our trucks carry Toto fill valves, flappers, gaskets, and the common Washlet inlet components so we can handle most Ontario service calls in one visit without waiting on parts. The warehouses and logistics corridors along the I-10 don’t change residential service much, but the older stucco slab homes in 91762 and 91764 do – those slabs sit on expansive soils that crack rings and shift flanges, and that’s the real service pattern in central Ontario. Homeowners in the newer master-planned communities face a different version of the same water chemistry, which is why we treat descaling as a recurring maintenance item across every Ontario ZIP we cover.
Toto Models & Products We Service in Ontario
Our crews work on Toto’s full residential lines: Drake CST743 and CST744 series, Ultramax II one-piece models, Aquia dual-flush, and Washlet S350e and C-series seats. For anything that touches the flush path or electronics – fill valves, flappers, washlet components – we use OEM Toto parts. It matters in Ontario’s hard water, where aftermarket parts wear out faster and don’t always seat properly in Toto’s valve bodies. For cosmetic wear items like bolt caps and seat bumpers, quality aftermarket is fine. Also worth knowing: Toto sales & service from Sundance covers the full spectrum from single-fixture swaps to complete bath builds. We stock the common OEM parts for fast Ontario turnaround, and anything else is sourced quickly through our supply network.
See the difference
Before
After
Before
After
Before
AfterToto Service Pricing in Ontario
The table below reflects what our Toto-related bathroom work typically runs in Ontario. These are market-calibrated ranges, not guesses – and every project gets a written line-item quote before work starts.
| Service | Typical Range |
|---|---|
| Bathroom Remodel | $9,000 – $28,000 |
| Walk-In Shower Installation | $4,500 – $12,000 |
| Bathroom Vanity Installation | $800 – $3,000 |
| Tile & Flooring (per bath tile scope) | $4,500 – $12,000 |
The largest cost variables are waterproofing scope, tile selection, and whether the slab needs flange or drain work before the finish goes in. A free estimate tells you exactly where your project lands. Call (877) 752-3951 and we’ll walk the space, check the existing Toto rough-in, and give you a number you can plan around.
Serving Ontario, CA - Our Local Coverage Area
We serve Ontario and nearby communities. Also see La Verne Toto service. Use the map below to see the area we cover. If you’re nearby, we can almost certainly help.
FAQs – Toto Construction in Ontario
Probably not. In Ontario homes we see most Washlet error codes trace back to voltage sags, heat cycling, or a scaled inlet screen, not a dead control board. First sentence aside, we test the power supply and control board, then decide whether it’s an OEM part swap or a full seat replacement. Call (877) 752-3951 and we’ll diagnose it.
Your 91764 slab sits on expansive Inland Empire clay, and the wet-dry cycles shift the slab enough to break the wax ring seal and loosen the closet flange. We reset the bowl with a new flange repair ring, OEM wax seal, and proper shims, and the toilet sits solid again. The fix is usually a service call, not a new toilet.
In most Ontario homes, yes. Toto toilets are built to be rebuilt. The bowls and trapways hold up for decades, and the parts that wear – fill valves, flappers, gaskets – are OEM-replaceable. We recommend replace only when the bowl is cracked or the trapway is compromised. Keeping a good Drake or Ultramax II during your remodel frees budget for tile or a Washlet upgrade.
We do it regularly. We waterproof the pan, set the Toto fixture and drain, install tile or solid surface, and pull permits so the inspection stays clean. Most Ontario tub-to-shower conversions run $3,500 to $10,000 depending on materials and whether the drain or flange needs work. Call (877) 752-3951 for an exact quote.
Yes. We work in Ontario’s newer master-planned communities too, and we’ve seen firsthand how slab settlement on recently converted land can throw off Toto rough-ins in the first few seasons. Whether it’s a production Drake in a new build, Toto in Los Serranos, or a full bath scope in an infill home, we set fixtures so they stay level and watertight. Estimates are free.
Service Areas Near Ontario
We cover Ontario and the surrounding Inland Empire and north Orange County corridors. If you’re nearby, we also provide Toto service in Yorba Linda and Toto service in Placentia, plus Villa Park, Brea, Fullerton, and Anaheim. Same crews, same independent Toto expertise. Check our Ontario service area page for full ZIP coverage and scheduling details.
Book Your Toto Service in Ontario Today
If you’re in Ontario and your Toto fixture is leaking, rocking, or throwing codes, call us. We’ll schedule a service visit, diagnose the real problem, and give you a written quote before any work starts. Reach Sundance Contractors at (877) 752-3951.
Written by Noel Carranza, Owner at Sundance Contractors, serving Ontario and the surrounding Inland Empire since 2005.