Free written scope consultation - allowances, timeline, and change-order rules on paper before a single trade is scheduled
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After
Before
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Before
AfterFast, Reliable Bathroom Remodeling Across Ontario
A full bathroom remodel in Ontario typically costs $9,000-$28,000, with most projects quoted within 48 hours of inspection and work starting only after you have a written, line-item price in hand. Our crews serve Ontario from our Inland Empire office, carrying the same documentation discipline - written scope, signed change orders, photo records - that has kept 4,000-plus projects within a few percent of their original quote since 2007. Call (909) 373-9612 to schedule your free estimate.
Ontario’s housing stock is layered and particular. Pre-WWII bungalows cluster near historic downtown, postwar concrete-block and wood-frame tracts fill the 1950s-70s rings, and large stucco-on-wood subdivisions spread inland from the 1980s boom forward. Each era carries its own bathroom problems: galvanized plumbing, aluminum wiring, no waterproofing membrane, slab cracks from the Chino Valley clay beneath. We have opened walls in all of them. The surprises are predictable once you know what to look for, and we look before we quote.
Why Rowan Construction Group Rancho Cucamonga Is Ontario’s Preferred Bathroom Remodeling Company
Our Bathroom Remodeling team has delivered hundreds of projects across the Inland Empire, and Ontario’s mix of aging slab homes and expanding families keeps us regular visitors to neighborhoods from the Grove Avenue historic district north to the newer tracts near Ontario Ranch. Customers here tend to research hard - they read the three-star reviews, compare material specs, and want the price range on the page before they call. We build for that customer.
Under The Haven Standard, Clause 1 is the written price before any work starts. No exceptions. Our 365-Day Done Right Promise is printed on every contract, backed by a terms page, not an asterisk. Crews are background-checked and uniformed; a live person answers calls 24/7; and every visit produces a documented photo record included as standard. The Free Second Opinion on any written estimate means you can bring a competitor’s quote and we will review it line by line at no charge.
Dispatch and scheduling are coordinated from our Inland Empire office, with crews serving Ontario locally. We do not subcontract to out-of-area teams who get surprised by SCAQMD dust-control requirements or Ontario’s expansive-soil conditions. That local fluency matters when your slab is heaving.
Our Bathroom Remodeling Services in Ontario
Full Bathroom Remodeling
A full bathroom remodel in Ontario strips the room to substrate and rebuilds it - new layout if needed, new plumbing rough-in, waterproofing, tile, fixtures, and finish. In Ontario’s 1950s-70s concrete-block and wood-frame tracts, this almost always reveals galvanized supply lines, ungrounded or aluminum wiring, and no pan liner under original tile. We inspect before we quote, price those conditions in writing, and only demo after you sign the scope. A typical full remodel in Ontario runs $9,000-$28,000.
Walk-In Showers & Shower Remodeling
Walk-in shower installation in Ontario runs $4,500-$12,000, depending on whether we are converting a tub footprint or expanding into adjacent space. The frameless glass enclosures we install - sourced through Kohler and Moen dealers - need plumb walls and a properly sloped pan, both of which become complicated when Ontario’s clay soil has shifted the slab. We flood-test every pan before tile goes down, with inspection sign-off, because a failed pan in a slab home means cutting concrete, not just replacing drywall.
Tub-to-Shower Conversion
Tub-to-shower conversion in Ontario costs $3,500-$10,000 and is one of the most common requests we see in the 1960s-80s tracts near Montclair and Upland borders. The tub rough-in is rarely positioned for a modern walk-in shower drain, and the original galvanized drain line is often corroded at the slab penetration. We opened a 1968 slab-on-grade hall bath off Grove Avenue near historic downtown and found the tub drain rough-in weeping into a hairline slab crack, with galvanized supply lines and no pan liner under the original tile. After inspection we priced a new PVC pan with a pre-slope, PEX re-pipe of the wet wall, and a self-leveler pour over the cracked slab - all documented as a change order before we set a single tile, then Kohler and Moen fixtures and a frameless glass enclosure to close out.
Vanities, Tile & Fixtures
Vanity installation in Ontario runs $800-$3,000, with tile and fixture packages scaled to the room size and your material selection. We source through fifty-plus vetted brands including Silestone and Caesarstone for countertops, Kohler and Moen for fixtures, giving the written quote honest numbers rather than inflated allowances. In Ontario’s heat-island climate - summer temperatures regularly exceeding 100°F amplified by the surrounding warehouse district - we schedule finish work to avoid rapid moisture loss in grout and caulk, which can cause premature cracking.
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.
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AfterTrusted Brands We Service in Ontario
We maintain supplier relationships that let us quote real numbers, not placeholders. For Ontario bathroom remodels, that means Kohler and Moen fixtures with local dealer support for warranty claims and replacement parts; Silestone and Caesarstone countertops with slab-yard selection in the Inland Empire; and tile sourced through distributors who stock California Title 24-compliant materials. Fast turnaround on parts matters when your bathroom is out of commission. We do not quote brands we cannot source promptly - that is how projects stall, and we do not let projects stall.
Common Bathroom Remodeling Problems We See in Ontario Homes
- Cracked or heaved slab subfloors once tile is demoed. Because most of Ontario’s residential grid sits on expansive Chino Valley clay, slab-on-grade bathroom remodels here routinely reveal cracked or heaved subfloor slabs once tile is demoed - a foundation condition that shows up far less in equivalent Pomona tracts west of town. We inspect for this, price the self-leveler or repair in the original quote, and document it before demolition starts.
- Galvanized supply lines and corroded drain rough-ins in pre-1980 homes. The 1950s-70s concrete-block and wood-frame tracts across Ontario still run galvanized steel for water supply and cast-iron or galvanized drains. Once walls are open, the corrosion is visible - but only if you looked before quoting. We include a wet-wall inspection in our standard scope.
- No waterproofing membrane under original tile. Ontario’s postwar builders often set tile directly on concrete or mortar beds with no liquid-applied or sheet membrane. In a climate with Santa Ana wind events that drive rapid moisture changes, that missing membrane means substrate failure within years, not decades. We install proper waterproofing on every job, inspected and signed off.
- Outdated wiring that triggers full electrical upgrades once walls are open. Ungrounded outlets, aluminum branch circuits, or insufficient amperage to support modern GFCI requirements - all common in Ontario’s older stock - must be addressed when the permit is pulled. We coordinate electrical inspection as part of the rough-in sequence, not as a surprise add-on after close-up.
Pricing for Bathroom Remodeling in Ontario, CA
These are the ranges we write into Ontario contracts after inspection and before any work starts. Every price is flat, with a written scope and written warranty. No change proceeds without a signed change order.
| Service | Price Range in Ontario |
|---|---|
| Bathroom Remodel | $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 moves the number: room size, material grade, plumbing relocation, electrical upgrade needs, and slab condition. A tub-to-shower conversion stays at the lower end when drain location works and the slab is sound; it moves toward $10,000 when we are cutting concrete, re-piping the wet wall, and leveling a heaved floor. We do not quote off a visual walkthrough. We inspect, photograph, and write the price. Call (909) 373-9612 for your free estimate - bring a competitor’s written quote and we will review it line by line at no charge.
We Also Serve Cities Near Ontario
Our crews work across the Inland Empire corridor, with regular projects in Ontario and neighboring Montclair, Claremont, Upland, and Rancho Cucamonga. Each city carries its own soil conditions, housing eras, and permit timelines; we adjust our inspection checklist and scheduling accordingly. If you are near the Ontario border in any of these cities, the same written-price discipline and documented photo record apply.
Serving Ontario, CA - Our Local Coverage Area
We’re based in the Ontario 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 Ontario
The first quote was likely a visual walkthrough with no inspection, and it will grow once walls are open. Ontario’s older homes - especially the concrete-block and slab-on-grade tracts from the 1950s-80s - routinely hide galvanized plumbing, aluminum wiring, no waterproofing membrane, and cracked slabs from Chino Valley clay expansion. We price those conditions after inspection, in writing, before demo. A lower opening number that doubles after start is not a better deal. Call (909) 373-9612 for an exact quote - estimates are free.
Yes. Ontario falls under San Bernardino County permitting for unincorporated areas and the City of Ontario’s Building & Safety Division for incorporated zones, with inspections required on rough plumbing, electrical, and pan flood-testing before close-up. We pull permits as standard, schedule inspection sign-offs, and include that coordination in our flat price. Skipping permit inspection to save time risks re-demo at your cost if the inspector demands access after walls are closed. Call (909) 373-9612 and we will confirm permit requirements for your specific address.
Almost certainly. Ontario sits on expansive Chino Valley clay that swells when wet and shrinks when dry, cycling seasonally and stressing slab-on-grade foundations. Hairline cracks are common; differential heave that affects drainage slope is the problem we address. We inspect slab condition during our pre-quote walkthrough, price self-leveling or repair if needed, and document it in the written scope before tile goes down. Setting tile over an active crack without remediation guarantees callback. Call (909) 373-9612 for an inspection.
It starts with removing the tub and assessing the drain location, which is rarely optimal for a modern walk-in shower. In 1960s Ontario tracts, we typically find galvanized drain lines corroded at the slab penetration, undersized framing around the wet wall, and no pan liner. Our scope includes relocating the drain to center if needed, replacing galvanized with PVC, reinforcing framing for grab bars and glass, pouring a pre-sloped pan with waterproofing membrane, and finishing with tile and a frameless enclosure. A typical conversion runs $3,500-$10,000 in Ontario. Call (909) 373-9612 to schedule an inspection and written quote.
Inspection first, written price second, signed change order for anything unexpected. Under The Haven Standard, Clause 1 requires the price in writing before work starts; our administrative discipline requires a signed change order before any additional work proceeds. We have kept projects within a few percent of their agreed cost across 4,000-plus jobs since 2007 by documenting what we find, pricing it, and getting approval - not by absorbing surprises into margin or surprising the customer later. The photo record on every visit shows you exactly what we found and what we did. Call (909) 373-9612 to start with a free estimate.
Written by Grant Rowan, Owner at Rowan Construction Group, serving Ontario since 2007.