Fast, Reliable Bathroom Remodeling Across Rialto
A bathroom remodel in Rialto typically costs $9,800 – $27,500 depending on whether you’re updating an existing 5’x8′ hall bath or fully gutting and reconfiguring a larger space. Most full tear-outs run 3 – 6 weeks, with permit review adding a week or two depending on what the inspector flags. If you call (855) 949-1913, we’ll schedule a walkthrough at your Rialto home, open the walls if needed to see what’s really there, and give you a line-item quote before any work starts.
We know the 92376 and 92377 neighborhoods, the post-war tract layouts off Merrill and Baseline, and what happens when a 1960s bathroom meets today’s plumbing code. That local knowledge matters because Rialto’s housing stock has very specific failure patterns, and a contractor who just replaces tile without checking what’s behind it will hand you a remodel that fails within a few years.
Why Sunstone ADU Builders Is Rialto’s Preferred Bathroom Remodeling Company
Most general contractors in the Inland Empire split their week between kitchens, additions, roofing, and whatever else comes through the door. We don’t. Sunstone ADU Builders lives in the space where older homes meet new construction, and our Bathroom Remodeling work comes out of the same discipline we apply to full ADU builds: inspect first, write allowances into the contract, get written approval before any surprise goes on the invoice.
Nate Holloway, our lead, has walked enough 1950s-70s Rialto homes off Riverside Avenue and along the northern stretch of Cactus to know exactly what hides behind those original tile surrounds. Homeowners across Rialto consistently tell us the same thing: the estimate was honest from day one, and when the crew found something, they explained it in plain English and priced it before touching it. That reputation is what keeps our schedule full in Bloomington and keeps referrals coming from Fontana.
When you call about a bathroom in Rialto, you’re not getting routed to a call center. We typically get someone to your property within 2 – 3 business days for an initial look, and we’ll often bring a moisture meter and a boroscope to check what’s behind the walls during that first visit. That pre-demo inspection is where most Rialto remodels are won or lost.
Our Bathroom Remodeling Services in Rialto
Pre-Demo Inspection and Moisture Testing
Before a single tile comes off, we moisture-test the walls around the tub, shower, and toilet flange. Rialto’s original drywall-backed tile surrounds wick shower moisture straight into the wood framing, and after 50+ years that framing is often soft or starting to fail. We document anything questionable, take photos, and put the plan in front of you before demo starts. No surprises after the sledgehammer comes out.
Framing and Rough-Plumbing Allowance Upgrades
Here’s the honest truth about Rialto bathrooms: the original rough plumbing was undersized when it was installed, and it’s only gotten worse. Galvanized supply lines corrode from the inside and choke flow down to a trickle. We write specific allowances into every contract for framing repairs and rough-plumbing replacement, with unit pricing so you know what a new drain run costs, what a venting upgrade costs, and what framing sistering costs. When we find something, you approve the number before we proceed.
Waterproofing and Cement-Board Tile Installs
We will not tile over drywall in a wet area, period. Rialto homes built from the 1950s through the 1970s need cement board and a liquid-applied waterproofing membrane behind every shower and tub surround. That’s not an upsell. It’s the difference between a surround that lasts 7 years and one that lasts 30. We specify James Hardie cement board as our standard because it holds up in Rialto’s dry heat and doesn’t swell or disintegrate when moisture gets past the grout.
Drainage and Venting Corrections
Rialto’s original post-war tract bathrooms were built with small 4-inch drain runs and undersized venting, and perforated galvanized supply lines that corrode shut. When we open a 1950s-70s bath here, it almost always triggers drainage and venting upgrades under current code, not just cosmetic fixes. Our plumbing rough-in team handles those corrections in-house, so the permit inspection doesn’t get put off because a separate subcontractor hasn’t shown up.
What happens when you call
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A real person answersNo phone trees — you reach a local pro.
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You get an upfront price rangeHonest numbers before anyone is dispatched.
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A background-checked tech heads outLicensed & insured, dispatched right away.
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You approve before work beginsNothing starts until you say go.
Trusted Brands We Service in Rialto
We’re authorized builders for Cover, Dvele, and Mighty Buildings prefab systems, and that manufacturing partner network carries over to our bathroom work. When we order a Dvele bathroom module or a Cover interior finish package for a Rialto ADU, the plumbing fixtures, cabinetry, and tile spec arrive already coordinated. That means shorter lead times for homeowners in 92376 and 92377 who are adding a bathroom as part of an ADU build, and it means fewer change orders halfway through. We keep common replacement parts and finish samples at our shop for Rialto clients to review without driving to a showroom in Ontario or Rancho Cucamonga.
Common Bathroom Remodeling Problems We See in Rialto Homes
- Failed waterproofing behind original tile. Most 1950s-70s Rialto homes went up with drywall behind the tile. Decades of shower steam have wicked into that drywall and into the studs. If we just re-tile over it, the new tile fails within a few years. We pull the surround to the studs, check for rot, and rebuild with cement board and membrane.
- Galvanized drain and supply lines that clog and corrode. Rialto’s original plumbing was galvanized steel, and it doesn’t age well in the Inland Empire’s hard water. Supply lines scale shut from the inside, and drain lines develop channel after decades of minerals. Open the wall, and a pressure test often reveals the real condition that a visual inspection can’t.
- Undersized venting that causes gurgling and siphoning. The 4-inch drain runs and unvented or under-vented configurations common in Rialto’s tract homes mean modern toilets and shower valves don’t perform the way they should. Code now requires proper venting, and opening the wall for a remodel is the moment to fix it, not patch around it.
- Slab penetrations and flat, clay-heavy soil drainage issues west of Riverside Avenue. Many Rialto homes sit on expansive, clay-heavy soil. When a bathroom addition or ADU bath goes in on that west side, the drainage plan has to account for slow percolation and potential movement. We design to code with that soil in mind, and we pull permits so inspections happen.
Pricing for Bathroom Remodeling in Rialto, CA
Here are honest Rialto market ranges for the most common scopes. A cosmetic update: new vanity, toilet, lighting, and a re-glazed or replaced tub runs $9,800 – $14,500. A full mid-range gut with new tile surround, cement board, upgraded valve, flooring, and new fixtures: $16,000 – $22,000. A master bath reconfiguration that moves walls, replaces all rough plumbing and venting, and adds a walk-in shower: $24,000 – $32,000+. When the walls come open and the galvanized drain is rotted, that rough-plumbing allowance is what keeps the final number from jumping without your approval. Call (855) 949-1913 for a free, detailed estimate on your specific Rialto bathroom.
We Also Serve Cities Near Rialto
Beyond our work across Rialto, we regularly handle bathroom remodels in Rialto-adjacent communities: Bloomington, Fontana, Muscoy, and San Bernardino. Same inspection-first approach, same written allowances, same crew. If you’re in one of those markets and want the same level of pre-demo diligence, call us at (855) 949-1913.
Serving Rialto, CA — Our Local Coverage Area
We’re based in the Rialto 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 – Bathroom Remodeling in Rialto
Because 1950s-70s Rialto tract homes almost always hide problems that don’t show in the quote stage: rotted framing behind original tile, 1.5-inch galvanized drain lines that fail a pressure test, and undersized venting that won’t pass code. The walls are open, and code says you have to fix it. Our contracts include written allowances with unit pricing for framing and rough plumbing, so the additional cost is reviewed and approved by you in writing before we spend a dollar on it. Call (855) 949-1913 for an exact quote with allowances built in.
Yes. If you’re changing plumbing, moving drain locations, altering the venting, or touching the electrical beyond a fixture swap, Rialto requires a building permit. Our scope includes pulling those permits and scheduling inspections. Skipping the permit on a bathroom remodel in Rialto can be flagged during a future home sale and can invalidate insurance claims. We handle the paperwork.
If you’re adding a bath as part of an ADU or an addition on the west side of Rialto, the drainage plan has to account for slow-percolating, expansive clay soil. We design drainage with proper fall, upsized pipe where the soil demands it, and separation from the slab so soil movement doesn’t crack the line. We also include drainage cleanouts and, where code triggers it, separate metering for an ADU bath with alley access. We pull the permit, and the inspection happens before we cover anything. Call (855) 949-1913 to discuss your west-Riverside site.
We use a liquid-applied waterproofing membrane over James Hardie cement board for every shower and tub surround in Rialto. That system is standard on every project, not an upgrade. Rialto’s original 1950s-70s bathrooms didn’t have any waterproofing beyond the tile and grout, which is exactly why the framing behind so many original surrounds is rotted. The membrane gives you a continuous moisture barrier that handles the Inland Empire’s heat without degrading.
Yes, when you address moisture and ventilation together. Rialto’s summer highs over 100°F mean an unventilated bathroom becomes a humidity chamber after a shower, and that moisture finds its way into drywall, caulk lines, and framing. We install proper exhaust fans that actually vent outside, not into the attic, and we seal and insulate exterior walls during the remodel. That keeps the room cooler, the air drier, and the grout from developing mold in the first place. Call (855) 949-1913 to schedule a look at your Rialto bathroom.
Get an Honest Rialto Bathroom Remodel Estimate
If you want a bathroom remodel done right in Rialto, with inspection before demo, written allowances for framing and plumbing surprises, and one company handling the whole scope, call (855) 949-1913 to schedule your free walkthrough. We’ll check the moisture behind the tile, test the plumbing while the walls are still closed, and give you a line-item quote that tells you exactly what you’re paying for. No vague allowances. No re-tiling over rot.
Written by Nate Holloway, Owner at Sunstone ADU Builders, serving Rialto and the Inland Empire with inspection-first bathroom remodeling and ADU construction.