Free written scope consultation - allowances, timeline, and change-order rules on paper before a single trade is scheduled
Toto Construction in Bonita, CA | Rowan Construction Group Chula Vista
We provide independent Toto installation and repair across Bonita’s unincorporated hillside properties, with one difference that matters: we pull county permits through San Diego DPLU and know the GFCI and inspection requirements that city-accustomed crews miss. If you’re adding a Washlet to a 1970s ranch bathroom or rebuilding around a Neorest after slab settlement, call (619) 536-0571 for a written estimate before any work starts.
Why Bonita Residents Choose Us for Toto Service
We’ve worked Toto fixtures into enough Bonita bathrooms to know where the surprises hide. The clay-heavy soils off Willow Glen Drive shift closet flanges. The canyon rims near the Sweetwater River valley throw power surges that fry Washlet control boards. County inspectors check GFCI protection on washlet circuits with a specificity that city crews rarely see. That familiarity comes from years of Bonita service area work, not from a certificate on the wall.
Grant Rowan trained in construction technology at West Los Angeles College, then spent two decades in residential and light commercial work before founding this operation in 2007. He still shows up in boots on day one of every project because, as he puts it, “Measure twice, document once, build it so you never have to come back.” Our crews are background-checked and uniformed; a live person answers calls 24/7; and every visit produces a documented photo record included as standard. We quote flat written prices with written scopes before any tool comes out of the truck. No change proceeds without a signed change order. That’s the discipline that has kept our projects within a few percent of the agreed number across 4,000-plus jobs.
We are not a Toto-authorized dealer. We are an independent construction firm that sources genuine Toto OEM fill valves, flappers, and washlet seat assemblies when the unit warrants it, and quality aftermarket parts when that is the smarter spend. Our Toto sales & service depth covers the full product line, from Drake and Ultramax II toilets to Neorest integrated units and Washlet retrofit seats.
Common Toto Construction Problems We Solve in Bonita

- Washlet control board failure from power surges. Bonita’s canyon-rim properties, especially near the High Fire Hazard Severity Zone perimeters, experience voltage spikes that city grids don’t. We’ve replaced S550e and K300 control boards that simply stopped responding, then installed whole-home surge protection at the subpanel so it doesn’t happen again.
- Corroded fill and flush valves in flood-zone humidity. The Sweetwater River valley’s humid microclimate accelerates corrosion on Drake and Ultramax II proprietary valves. Toilets ghost-run or flush weak. We replace with OEM valves on newer units, aftermarket spec-matched valves on older ones.
- Wax-ring and flange leaks from slab settlement. Bonita’s 1960s-1980s ranch homes sit on original slabs over clay-heavy hillside soils. The ground moves. The closet flange shifts. Neorest and Washlet toilets, with their heavier integrated seats, stress the wax ring harder than standard units. We pull the toilet, reset the flange, and document the repair with photos.
- Mineral scaling on rim jets and washlet nozzles. Large-lot Bonita properties often run on blended or well water with higher mineral content. Toto’s ceramic rim jets and Washlet spray nozzles clog gradually, reducing rinse pressure below what the product was designed to deliver. We descale with methods that won’t damage the ceramic or the electronic components.
- GFCI non-compliance on washlet circuits flagged at county inspection. This is the one that stops projects cold. Bonita’s unincorporated status means county DPLU inspectors, not city inspectors, sign off on plumbing permits. They check for dedicated GFCI protection on every washlet outlet. Crews accustomed to Chula Vista’s city process often skip this. We don’t.
Before
AfterToto Service in Bonita: What Local Conditions Mean for Your Equipment
Here’s the fact that reshapes how Toto work gets done in Bonita: this community is unincorporated San Diego County, not a city. That means no Chula Vista building department, no city plumbing inspector, no city fire marshal. Every permit, every inspection, every fire-overlay review runs through the county’s Department of Planning & Development Services. Contractors who cross from Chula Vista or National City expecting familiar timelines and familiar faces hit a wall.
For Toto owners, this matters in specific ways. A bathroom remodel that relocates a toilet drain or adds a 120V Washlet circuit needs a county DPLU plumbing permit, not a city permit. County inspectors specifically verify GFCI protection on washlet outlets, a step that city-accustomed crews routinely omit and that fails inspection. The county grading ordinance applies to Bonita’s hilly terrain, so any bathroom addition on a slope may trigger geotechnical review that a flatland project wouldn’t face. And if your property includes equestrian structures, county Agriculture gets involved too, adding weeks most contractors don’t budget for. We’ve navigated this enough times that we build county coordination into our project timelines from the first written quote.
Toto Models & Products We Service in Bonita

We work with the full Toto line currently installed in Bonita homes:
- Washlet integrated and retrofit seats: S550e, C5, and K300 models. We stock common seat assemblies and control boards for fast turnaround on the Bonita side of the county.
- Drake and Ultramax II toilets: One-piece and two-piece configurations. We carry OEM fill valves and flappers, plus aftermarket alternatives that meet the same flush-volume spec at lower cost for units past their fifth year.
- Neorest integrated toilets: AH, RH, and dual-flush models. These are complex units, electronic and plumbing in one ceramic shell. We diagnose control board failures, seat-heating faults, and auto-flush sensor issues, then source parts or advise when replacement is the better spend.
- Aquia dual-flush toilets: Popular in water-conscious Bonita remodels. We handle valve replacements, flush-button repairs, and integration into new bathroom layouts.
Our parts stance is straightforward: genuine Toto OEM when the unit is under five years old and worth the investment; quality aftermarket when age makes OEM spending irrational. If a Neorest control board fails out of warranty and the replacement approaches half the cost of a new unit, we tell you straight.
Toto Service Pricing in Bonita
These are the ranges we quote in writing before work begins on bathroom projects involving Toto fixtures in the Bonita market:
| Service | Price Range |
|---|---|
| Bathroom Remodel (with Toto toilet integration) | $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 |
| Bathroom Vanity Installation | $800-$3,000 |
What drives the number: whether we’re working within existing walls or moving drains, the condition of the subfloor and closet flange after years of clay-soil settlement, whether county DPLU requires geotechnical or fire-overlay review, and whether the Toto unit is a simple Drake swap or a full Neorest rough-in with dedicated electrical. Every quote is flat-priced with a written scope and a written warranty. No change proceeds without a signed change order. For an exact number on your specific Bonita property, call (619) 536-0571 - estimates are free, and we offer a free second opinion on any competitor’s written quote.
Serving Bonita, CA - Our Local Coverage Area

We’re based in the Bonita 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 Bonita
Yes, but it must be upgraded to a GFCI-protected dedicated circuit to pass county DPLU inspection. We handle the electrical rough-in as part of the bathroom scope. Call (619) 536-0571 and we’ll assess your existing wiring during the free estimate.
It depends on age and which board failed. If the unit is under five years old, OEM control board replacement usually makes sense. If it’s older and the replacement part approaches half the cost of a new Neorest, we recommend replacement. We diagnosed exactly this on a Willow Glen Drive property - fried board from canyon-rim surges, slab-shifted flange, both fixable, and the homeowner kept the unit. Call (619) 536-0571 for an exact diagnosis.
Yes. Bonita is unincorporated San Diego County, so DPLU issues all plumbing permits. A straight swap of an existing toilet on the same flange may not require permitting, but moving the drain or adding a washlet circuit always does. County inspectors specifically check GFCI protection. We pull permits and schedule inspections as standard on every job that requires them.
Two common causes in Bonita’s 1960s-1980s ranch homes: corroded fill valve from the Sweetwater valley’s humid microclimate, or low incoming pressure due to galvanized supply lines in the original construction. We test pressure at the valve and inspect the fill mechanism. The fix is usually straightforward once we know which it is. Call (619) 536-0571 to schedule a look.
Yes, if the flange is sound and the finish coordinates with the new design. We often retain Aquia units in Bonita remodels - they’re water-efficient and the dual-flush mechanism is durable. We verify the closet flange for settlement, check valve function, and design the new layout around the existing rough-in if the homeowner prefers. Call (619) 536-0571 to discuss keeping your Aquia in the new bathroom.
Service Areas Near Bonita

We handle Toto service throughout the unincorporated Bonita hillside and into surrounding communities: Toto service in Chula Vista, where city permitting applies and we coordinate differently; Toto service in National City; plus Imperial Beach, Spring Valley, and Lemon Grove. Each jurisdiction has its own permit pathway, and we know which is which.
Book Your Toto Service in Bonita Today
Call (619) 536-0571 to schedule your free estimate. We’ll assess your Toto unit, check the Bonita-specific conditions that affect it, and deliver a written flat price with a written scope before any work begins. The 365-Day Done Right Promise applies to every job: if it’s not done right, we make it right, backed by The Haven Standard, not a handshake.
Written by Grant Rowan, Owner at Rowan Construction Group Chula Vista, serving Bonita since 2007.







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