Fast, Reliable Bathroom Remodeling Across Muscoy
A bathroom remodel in Muscoy typically runs $18,000 to $42,000 for a full gut renovation, with shower and tub replacements landing between $7,500 and $14,000. Most projects take three to five weeks once permits clear San Bernardino County. If you’re planning a bathroom update in the 92405 ZIP code, the first thing to understand is that Muscoy is unincorporated county territory, not city of San Bernardino, so your permit runs through a different office with different inspection triggers. We’ve remodeled bathrooms throughout Muscoy’s older housing stock and we know exactly what those county inspectors look for. Call us at (855) 676-6807 to schedule a free estimate and we’ll walk your property before you commit to anything.

Why Sunburst ADU Builders Is Muscoy’s Preferred Bathroom Remodeling Company
Muscoy homeowners call us because we already understand the unincorporated-building reality here, and that saves real money and weeks of delay. Our team has pulled county permits for bathroom remodels on properties along Cajon Boulevard, State Street, and the residential streets branching west toward the foothills. We know which county inspectors work this corridor and what they flag on mid-century homes. That familiarity means our remodels pass inspection the first time more often than not, and you’re not paying for rework caused by a contractor learning county code on your dime.
Noel Carrasco founded Sunburst ADU Builders with a focus on accessory dwelling units, but bathroom remodeling became a core service because every ADU we build needs a finished bath, and most Muscoy primary homes need theirs upgraded too. Our Bathroom Remodeling team brings the same full-scope discipline to your existing home that we bring to a new ADU: one contract, written line-item allowances for hidden conditions, and documentation at every inspection point. Muscoy customers consistently tell us the thing they valued most was not getting surprised by a change order they never saw coming.
Because we’re based in nearby Highland, we can typically be in Muscoy for a site visit within a day or two of your call. We carry fixtures and waterproofing materials from suppliers who serve the Inland Empire, so we’re not waiting on shipments from Los Angeles or Phoenix when your tile is backordered. That local supply chain matters in a community like Muscoy where the nearest showroom isn’t around the corner.
Our Bathroom Remodeling Services in Muscoy
We focus on three bathroom remodels types in Muscoy, but every project starts with the same step: a pre-demolition inspection that tells us what’s behind the walls before we swing a hammer. That’s the difference between a quote that holds and one that doubles by week two.
Full Bathroom Remodel
A full bathroom remodel in Muscoy usually means gutting a 1950s or 1960s bath down to the studs. We remove the old tub, tile, vanity, and flooring, then rebuild with new waterproofing, plumbing, electrical, and finishes. On homes along Muscoy’s older streets, we regularly find cast-iron drain lines and cloth-wrapped wiring that have to be brought to current code once the walls are open. We write those allowances into your contract on day one, so the cost is priced, not discovered.

Shower & Tub Replacement
Replacing a shower or tub in Muscoy often triggers more than a simple swap-out. County code requires the existing waterproofing system to be evaluated, and on older homes, the pan and drain assembly frequently fails inspection. We install code-compliant shower pans with pre-sloped mortar beds and liquid-applied waterproofing membranes rated for the Inland Empire’s dry-then-flashy climate. If your existing drain has corroded beyond reuse, we’ll document it, price it, and get your written approval before touching the plumbing.

Vanity & Fixture Upgrades
Sometimes a Muscoy bathroom doesn’t need a gut job, just smarter storage and working fixtures. We replace vanities, faucets, toilets, and lighting, and we’ll open the wall only where necessary. But even a vanity swap on an older Muscoy home can reveal water damage behind the cabinet or supply lines that aren’t up to current code. We handle those repairs as written change orders, so you’re never approving work you haven’t seen priced in writing.

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 Muscoy
We install and service fixtures from the major brands Muscoy homeowners already trust, and we keep common replacement parts in our Highland shop for faster turnaround. When we build or remodel a bathroom, we often specify James Hardie fiber-cement backing in wet zones because it holds up to the valley’s temperature swings better than standard gypsum board. For ADU bathrooms and primary home remodels alike, our work spans the same manufacturers we use across our ADU practice, including Plant Prefab and Mighty Buildings where a bathroom is part of a larger modular or prefab unit. If you’re planning a Tuff Shed conversion with a bathroom, we manage that scope too, tying the bathroom rough-in to the shed’s framing before finishes go in.
Common Bathroom Remodeling Problems We See in Muscoy Homes
Muscoy’s housing stock is predominantly mid-century single-family homes, and the failures we see repeat like a pattern. Here’s what we encounter most:

- Failed waterproofing behind old tile. The original builders of many Muscoy homes used green board or even plain drywall behind shower tile. Decades of steam and the valley’s temperature swings have broken down the substrate. We find soft, crumbling wall board behind tile that looked fine from the outside.
- Corroded cast-iron drain lines. On homes built before the 1970s, cast-iron drains have often rusted to the point of collapse. Opening a bathroom wall or pulling a toilet reveals pipe that crumbles at a touch. This is a code upgrade you don’t want to skip, and it’s one of the most common reasons a Muscoy remodel quote moves.
- Undersized framing from decades of notching. Plumbers and electricians from past decades hacked through floor joists and wall studs to run pipes and wires. Once walls are open, county inspectors require that compromised framing to be reinforced or sistered. We price that work as part of the structural allowance, never as a surprise.
- Septic and well-system conflicts. Many Muscoy properties are on septic rather than sewer, and some rely on well water. Adding a second bathroom or moving a toilet can trigger a septic capacity review under county code. We flag this during the estimate, before any permitting starts, so you know whether your remodel includes a septic evaluation.
Pricing for Bathroom Remodeling in Muscoy, CA
Here’s what Muscoy homeowners should expect to budget, based on real project scope:
- Vanity and fixture upgrade: $3,500 to $8,000
- Shower or tub replacement: $7,500 to $14,000
- Full bathroom remodel: $18,000 to $42,000
- Structural framing repair (sistered joists or reinforced studs): $1,200 to $4,500 depending on scope
- Cast-iron drain line replacement: $2,000 to $6,000 depending on footage and access
- Septic capacity review (when triggered): $500 to $1,500, plus any remediation the county requires
Your price in Muscoy depends on the age of your plumbing, the condition of your subfloor, and whether your property is on septic or sewer. We write allowances for every likely condition into the contract, and any work beyond those allowances is priced and approved by you in writing before we proceed. That’s not a promise, it’s how our contracts are structured. Call (855) 676-6807 for a free estimate and a walkthrough of what your specific bathroom needs.
On a mid-century home off Cajon Boulevard, our crew opened up a hall bathroom and found cast-iron drain lines corroded to the point of collapse, plus a subfloor that had been soaked by a failed wax ring for years. We documented everything with photos, added the drain replacement and subfloor repair to the contract as written change orders, and kept the project moving with a temporary shower pan so the family wasn’t without a bathroom. The finished remodel passed county inspection on the first try.
We Also Serve Cities Near Muscoy
Our Bathroom Remodeling in Muscoy service area extends to neighboring communities across the San Bernardino Valley. We handle bathroom remodels in San Bernardino, Rialto, Highland, and Crestline, where the permitting and building conditions change almost street by street. Whether you’re on city sewer in Rialto or a septic system in the county pocket near Muscoy, we know which code applies and what it means for your remodel budget.
Serving Muscoy, CA — Our Local Coverage Area
We’re based in the Muscoy 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 Muscoy
Yes, Muscoy is unincorporated San Bernardino County, so bathroom remodels that move plumbing or alter framing require a county building permit, not a city of San Bernardino permit. The county inspector will check waterproofing, drain connections, and any structural work you’re doing. Call (855) 676-6807 and we’ll tell you exactly which scope on your property triggers a permit.
The most common hidden problems are corroded cast-iron drains, failed waterproofing behind old tile, and undersized floor framing that prior plumbers notched through. On properties with septic systems, moving or adding fixtures can surface septic capacity issues the county requires you to address. We walk every Muscoy remodel with a pre-demolition inspection so these conditions are priced in the contract, not discovered mid-project.
We document the issue with photos, write a line-item change order with a firm price, and get your written approval before doing the work. Nothing gets touched that you haven’t seen priced. Call (855) 676-6807 if you want to see a sample contract before you commit.
Yes, and we do it regularly. Adding or relocating fixtures on a septic property often triggers a county septic capacity review, which may require a perc test or tank inspection. We coordinate that review as part of your permit package so you’re not waiting on it later. Estimates are free.
We use liquid-applied waterproofing membranes and pre-sloped mortar shower pans that meet current county building code. For wet-zone substrates, we specify James Hardie fiber-cement backing because it holds up to the Inland Empire’s heat and the moisture swings that come with flashy winter rain off the San Bernardino foothills. Call (855) 676-6807 for a free estimate and we’ll walk you through the exact waterproofing assembly we’d use in your home.
Written by Noel Carrasco, Owner at Sunburst ADU Builders, serving Muscoy and the San Bernardino Valley.