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Toto Home Additions & ADU: The Miami Owner’s Guide
Planning a home addition or ADU around Toto fixtures in Miami? Sawyer Remodel Miami installs Toto-compatible additions and accessory dwelling units, and the full project typically runs $53,100 to $153,400 depending on square footage, plumbing scope, and finish level. If you’re reading this because an existing Toto setup failed mid-project or you’re pricing an ADU with Toto fixtures from day one, the fix is straightforward: we quote the work in writing, match your Toto models to the right rough-in specs, and pull the permits before a single wall goes up. Most owners discover the issue when the project stalls, the plumbing rough-in doesn’t match the fixture spec, or a previous contractor left the addition half-finished.
Which Toto Models This Applies To
Toto’s lineup splits into two rough-in standards, and that’s where most addition and ADU projects go sideways. The Drake, Drake II, Ultramax II, and most Aquia models use a standard 12-inch rough-in, but Toto’s compact and skirted models, including several Nexus and Aimes lines, demand exact positioning on the drain and supply because there’s no slop in the rough opening. In a Miami ADU where wall depth is tight, a 10-inch rough-in Toto often gets ordered by mistake, and that means moving the flange. We check the spec before framing closes, not after tile goes up. For parts on existing Toto fixtures in an addition, we stock OEM fill valves, flush valves, and trip levers on the truck. Aftermarket equivalents from Fluidmaster and Korky work fine for Drake-class toilets, but skirted models really do want Toto OEM internals. Sawyer Remodel Miami is an independent contractor, not affiliated with Toto directly, so parts we source come from Toto-authorized distributors in South Florida, not a warehouse we control.
Quick rule for identifying what you have: Toto stamps the model number inside the tank or on the underside of the lid, something like CST744SG, MS446124CEMG, or ST743S. That stamp tells us everything about rough-in, flush valve type, and electrical needs if the seat or washlet is involved. Luca Romano has pulled apart enough Toto tanks in Brickell condos and Coral Gables bungalows to know the parts diagram by memory, and he’s the first to say the model number beats a photo every time.
Styles & brands we work with
Signs Your Toto Home Additions & ADU Is Failing
- The addition smells like drywall dust and sewage at the same time. A Toto flange not seated to the finished floor height means the wax ring never compresses, and sewer gas seeps into the new space. The fix means resetting the toilet at the correct height, not another layer of caulk.
- Water pulses in the bowl when the washing machine drains. This is usually a venting problem in the addition’s branch drain, and Toto’s high-efficiency flush makes it obvious because the bowl refill is so quick. In older Miami neighborhoods with cast iron stacks, this shows up fast when a new ADU ties in.
- The Toto washlet seat throws a “water supply” error within months. Hard Miami water eats at the inline filter and the solenoid. Toto’s own filter should be swapped every 6 to 12 months here, and we carry the exact part.
- The addition’s tile floor stays damp around the toilet base. Condensation from Toto’s high-tank models is one thing, but persistent moisture usually means a hairline crack in the bowl from over-tightened tank bolts during the original install.
- The flush starts strong and dies halfway. That’s the fill valve flapper chain binding or the flush valve gasket hardening. In a new addition, it often means the rough plumber used a universal flapper instead of Toto’s 3-inch tower.
See the difference
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After
Before
After
Before
AfterReplacement Cost & What’s Included
Home additions in Miami run $53,100 to $153,400. A detached ADU with kitchenette and full bath lands higher, usually $106,200 to $259,600 on its own. What’s included in our number: drawings, permits, foundation, framing, rough plumbing and electric tied to Toto specs, drywall, finishes, and all fixture installation. What drives cost up is the usual Miami reality: your lot may need soil amendments, your existing panel may not carry an ADU, and touching the old part of the house always reveals something. We write the price before work starts, and the number on our invoice is the number you approved. Every Toto fixture gets installed under our 365-Day Done Right Promise, so if something fails in the first year, we’re back on it without another invoice.
Key Takeaways
- Toto rough-in specs vary by model line; checking before framing closes saves thousands.
- OEM parts for skirted and washlet models, quality aftermarket for standard Drake-class repairs.
- Written price, permits handled, and the 365-Day Done Right Promise on every job.
- Call (850) 801-8046 for a free estimate on a Toto-ready addition or ADU in Miami.
DIY or Call Us?
You can check a few things yourself: confirm the model number inside the tank, listen for a hissing fill valve, and watch whether the bowl water level drops below the Toto water spot line over an hour. If the fill valve is the issue on a standard Drake, a homeowner with a wrench can swap in a replacement in twenty minutes, and we’ll even point you to the right part. The dangerous and expensive work is what sits inside the walls and under the slab: drain sizing, vent routing, and electrical for a washlet seat. A wrong wire gauge behind a Toto washlet is how you get a warm seat that trips the breaker or worse. Call us at (850) 801-8046 before you open a wall on an addition that’s been running Toto fixtures. Good work doesn’t need a sales pitch, but it does need a licensed trade pulling the permit.
FAQs
A properly installed Toto toilet will run 15 to 25 years in Miami, though the fill valve and flapper typically need replacement every 3 to 5 years. The washlet seat components, especially the water filter and solenoid, wear faster in South Florida because of hard water and humidity, and we usually see 5 to 8 years before a major washlet repair. Call (850) 801-8046 and we’ll tell you whether it’s worth fixing or replacing.
Usually yes. Fill valves, flush valves, trip levers, and washlet filters are all repairable, and most repairs land between $300 and $1,200 including parts and our visit. The only time replacement makes sense is a cracked bowl or an obsolete skirted model where the tank internals are no longer produced. For an exact number on your model, call (850) 801-8046 and we’ll price it from the model stamp over the phone.
A standard toilet rough-in and fixture set takes one technician about 2 to 3 hours when the drain and supply are already in the right place. If we’re moving a flange or correcting a rough-in error, plan for a half day to a full day depending on the concrete work involved in a Miami slab-on-grade. We schedule the work when the rough-in is exposed, which keeps the project moving instead of waiting on a callback.
We stock common Toto fill valves, flush valve gaskets, trip levers, and washlet filters on the truck so most repairs happen in one visit. Skirted model internals and less common washlet parts come from Toto-authorized distributors in South Florida, and that usually adds a day or two to the job. Call (850) 801-8046 with your model number and we’ll tell you before you book whether it’s a same-visit fix.
If you’re pricing a Toto-ready home addition or ADU in Miami, or you need a Toto fixture sorted before the project moves forward, call (850) 801-8046 for a free estimate. We’ll figure out what you have, what it needs, and what it costs, in writing, before any work begins. We also handle jobs involving KraftMaid, Cambria, and Silestone, so the whole addition runs on one schedule.
Written by Luca Romano, Owner & Lead Contractor, Sawyer Remodel Miami at Sawyer Remodel Miami, serving Miami and nearby areas.
