Toto Home Additions & ADU Nationwide

Toto Home Additions & ADU: The Sherman Oaks Owner’s Guide

We stock and install Toto-compatible fixtures and rough-in components for home additions and ADU projects in Sherman Oaks, with typical installed pricing for Toto-equipped spaces running $45,000-$130,000 for full additions and $90,000-$220,000 for standalone ADUs. Most Toto spec orders arrive within 3-5 business days, and we coordinate delivery so fixtures hit the job site exactly when rough-in and finish phases need them. Homeowners usually discover a Toto compatibility issue mid-project, when the Drake II or Ultramax II they specified doesn’t align with the 10-inch rough-in left by a previous owner, or when the Washlet+ connection they assumed was standard turns out to need a dedicated 120V GFCI circuit that wasn’t in the original electrical scope.

Call (213) 221-0788

Which Toto Models This Applies To

Toto’s residential line breaks into rough-in-dependent and rough-in-independent categories, and getting this wrong in a Sherman Oaks addition or ADU means either moving a toilet flange or eating a restocking fee. The Drake CST744E and Drake II CST454CEFG use a standard 12-inch rough-in, but Toto also manufactures 10-inch and 14-inch variants (CST744EF.10 and CST744EL.14) that ship with the same bowl profile and different tank footprints. The Ultramax II MS604114CEFG integrates tank and bowl as a one-piece, so rough-in flexibility is zero - measure the bolt-to-wall distance before ordering, not after demolition.

Washlet+ models (MW6042044CEFG, MW4742044CEFG) add another layer: the concealed supply and electrical chase requires Toto’s Uni-Fit adapter or a compatible skirted bowl, and the GFCI outlet must sit within 3 feet of the fixture centerline per California Electrical Code. We verify this during pre-construction walkthroughs in Sherman Oaks, not during trim week. For ADUs specifically, Toto’s commercial-grade EcoPower flush valves (TEU1UA12#CP, TEU1GN12#CP) sometimes get specified by architects chasing LEED points, but these require 1-inch water supply lines and 80 PSI minimum static pressure - rare in older Sherman Oaks mains without a booster pump. OEM Toto parts carry a one-year manufacturer defect warranty; the quality aftermarket equivalents we source from Korky and Fluidmaster fit identically and carry comparable coverage, though we note the substitution on every written quote under Clause 1 of the Haven Standard.

Signs Your Toto Home Additions & ADU Is Failing

• Phantom flushes or tank refilling at odd hours. The Toto flapper or flush valve seal is degrading, often from chlorine or mineral content in Valley municipal water. In Sherman Oaks, we see this accelerate on homes fed by older galvanized mains where sediment scours the silicone seal surface.
• Weak swirl despite full tank. The Tornado Flush rim jets are clogging with calcium buildup. On skirted bowls like the Carlyle II, these jets are molded into the ceramic and nearly impossible to clear without pulling the fixture - a point we flag during scope review.
• Washlet+ seat intermittent or completely dead. The inline strainer behind the seat is clogged, or the GFCI has tripped. Toto’s S550e and S500e draw 1,270W peak during water heating; shared circuits with hair dryers or space heaters in an ADU will trip a 15A breaker predictably.
• Rocking or seal failure at the base. The closet flange is sitting above the finished floor, or the wax ring compressed unevenly during a DIY install. On heated-floor additions we specify extra-thick reinforced wax or silicone foam rings to accommodate thermal expansion.
• Consistent double-flush needed. The fill valve (TSU99A.X) is set below the marked waterline, or the original 1.6 GPF tank was paired with a 1.28 GPF bowl in a mismatched replacement. Toto bowls and tanks are not universally interchangeable across generations.

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Replacement Cost & What’s Included

What drives the range: floor type (concrete slab vs. raised subfloor in Sherman Oaks hills homes), distance to nearest electrical panel, and whether we’re matching existing vintage Toto color (Sedona Beige, Bone) that runs 30-40% premium over Cotton White. Every quote is flat-priced with line-item breakdown - the Toto MSRP, our labor rate, permit fees if applicable, and the 365-Day Done Right Promise printed on the same page. No work starts until the price is signed. Change orders, when they arise, require a second signature before any crew touches the new scope. That’s the discipline that has kept our projects within a few percent of the agreed number across 4,000-plus jobs since 2007.

DIY or Call Us?

What you can safely check: verify the model number stamped on the tank lid interior (four-digit CST or MS prefix), measure rough-in from the wall to the bolt centers, and confirm your water pressure with a $10 gauge from any Sherman Oaks hardware store - Toto flush valves need 20 PSI minimum, and Tornado Flush performs poorly below 35 PSI.

Where DIY goes wrong: moving a closet flange on a concrete slab requires a hammer drill, diamond core bit, and proper anchoring into undisturbed concrete - we’ve seen homeowners crack the slab trying to chip-set a new flange. Washlet+ electrical work is GFCI-protected dedicated circuit territory, and California code requires a permit for any new bathroom circuit. The 120V seat heater draws enough current that an extension cord or shared outlet is a fire risk, not a workaround.

We’re not affiliated with Toto; we’re independent contractors who specify and install their products correctly the first time. If you’ve got a model number and a photo of the problem, call (213) 221-0788 - we’ll tell you whether it’s a parts swap or a scope revision, and the estimate is free either way.

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