Fast, Reliable Bathroom Remodeling Across Los Serranos
Bathroom remodeling in Los Serranos typically runs $18,000 – $34,000 for a full gut-and-replace, with walk-in shower conversions starting around $12,000 – $16,000. Most Los Serranos projects pull permits through San Bernardino County, not Chino Hills, which affects timeline and inspection scheduling. We know that split well, because we work the 91709 ZIP constantly. If you’re planning a bathroom remodel off Los Serranos Road or anywhere in Los Serranos, call (877) 801-4497 to get a free estimate with real numbers, not vague ranges.
Why Fullerton ADU Builders Is Los Serranos’s Preferred Bathroom Remodeling Company
Los Serranos homeowners call us because we already understand what their houses are. Most of the bathroom work here happens inside two-story stucco tract homes built between 1978 and 1995, and those homes have predictable failure points: orangeburg or corroded drain lines, polybutylene water pipes, aluminum branch wiring, and shower pans that were never properly sloped. A contractor who doesn’t know the local housing stock gets surprised when walls open. We plan for it.
Our reputation in the unincorporated parts of San Bernardino County is built on one thing: we pull the correct permit from the correct jurisdiction every single time. That sounds basic, but the county-versus-Chino Hills split trips up a surprising number of remodelers. Homeowners get red-tagged, lose two or three weeks, and then call us anyway. Don’t start there. Start with us.
The team is led by Glen Pacheco, and Glen has worked enough hillside and flat-lot bathrooms in Los Serranos to know which projects will trigger drainage review and which won’t. We respond to Los Serranos quickly, because we’re based just over in Fullerton and we send crews up the 71 corridor constantly. You’ll get a straight answer about your bathroom, your permit path, and your real cost before you sign anything.
Our Bathroom Remodeling Services in Los Serranos
Full Bathroom Remodel (Tub/Shower to Walk-In)
Converting a 1980s tub-shower combo into a curbless or low-threshold walk-in shower is the most common project we do in Los Serranos. Homes here were built with narrow tub surrounds and small wall cavities, so opening one up means reworking the footprint while preserving the slab. We handle framing, pan replacement, and the waterproofing the way San Bernardino County inspectors expect to see it, not the way the original builder skipped.
Waterproofing and Shower Pan Replacement
Failed waterproofing is the single most expensive surprise in Los Serranos bathrooms. Builders in the late 1980s and early 1990s often used cement board with no membrane or greenboard behind tile, and shower pans were frequently installed without a proper pre-slope. By the time tile cracks or grout fails, the subfloor is usually wet. We strip to studs, repair or replace framing, install a sloped pan with a modern membrane, and document everything with photos before closing the wall. If it’s done right, the county inspector signs off without a correction notice.
Permit and Inspection Management
Here’s the part that makes Los Serranos different from Chino, Chino Hills, or Yorba Linda: your bathroom permit comes from San Bernardino County, not a city building department. County plan check has its own forms, its own counter hours, and its own inspector routes. We manage the entire permit file, from drawing submittal to final sign-off. We also schedule inspections so you don’t have to take time off work. One less thing.
General Bathroom Upgrades and Code Compliance
Beyond water and tile, a Los Serranos bathroom remodel often triggers electrical and ventilation upgrades. When walls are opened, we fix what code requires: aluminum wiring pigtailing, GFCI placement, exhaust fans vented to the exterior rather than into the attic, and water-conserving fixtures. Most homes we open need at least two of those. We’ll tell you before we start, not after.
What happens when you call
- 1
A real person answersNo phone trees — you reach a local pro.
- 2
You get an upfront price rangeHonest numbers before anyone is dispatched.
- 3
A background-checked tech heads outLicensed & insured, dispatched right away.
- 4
You approve before work beginsNothing starts until you say go.
Trusted Brands We Service in Los Serranos
We work with the materials and fixtures that hold up in Los Serranos’s hot inland foothill summers and the moisture cycles of aging tract homes. We specify James Hardie backer and exterior products where they make sense because the material resists the heat and humidity swings better than budget alternatives. For larger bathroom-to-ADU combinations, our Bathroom Remodeling team draws on experience with Abodu and Cover where a prefab bath-ready unit makes more sense than a site-built addition. We don’t stock parts, but we spec materials with local suppliers in Chino and Pomona so lead times stay short for Los Serranos customers.
Common Bathroom Remodeling Problems We See in Los Serranos Homes
- Aluminum branch wiring. Homes built in Los Serranos between roughly 1978 and the mid-1980s often have aluminum circuits feeding bathroom outlets and lighting. Opening a wall triggers a requirement to pigtail or replace those circuits, and that cost never shows up in a visual walkthrough estimate.
- Failed shower pan slopes. We routinely find pans that were set flat, not sloped, because the original builder skipped the pre-slope layer. Water pools, the pan membrane eventually fails, and the subfloor rots under the tile. The county inspector will flag it, so we repair it before inspection.
- Improper or missing exhaust ventilation. Many Los Serranos bathrooms vent into the attic rather than outside, which pushes humid air into fiberglass insulation and roof framing. It’s a mold problem waiting to happen. Current code requires exterior venting, and we correct it as part of the remodel.
- Polybutylene water lines. If your house has gray plastic supply lines, they’re polybutylene and they’re a known failure point. We’ve opened Los Serranos bathrooms and found original copper patched with polybutylene, which is a leak waiting to happen. We replace the exposed sections with PEX while the wall is open.
Pricing for Bathroom Remodeling in Los Serranos, CA
Here’s what we actually see in Los Serranos, not what a national website guesses. A standard 5×8 hall bath gut remodel runs $18,000 – $26,000. A primary bath with a walk-in shower conversion, new vanity, flooring, and full waterproofing runs $26,000 – $34,000. Waterproofing-only repairs and shower pan replacement on their own run $4,500 – $8,500, depending on framing damage. If your home sits on a hillside lot near Chino Hills State Park and a bump-out or addition is involved, add drainage and fire-hazard-zone review costs. The best way to get a hard number is to call (877) 801-4497 for a free estimate. We write line-item quotes, and every surprise cost gets priced and approved in writing before work starts.
What Opening Up a Los Serranos Home Actually Turns Up
We want to be direct about this, because it’s the one thing that separates a smooth remodel from a stressful one. The homes in Los Serranos were built fast during the late 1970s through the 1990s, and shortcuts were standard for the era. Uninsulated walls. No waterproofing membrane. Shower drains set without a flange. Electrical runs that don’t meet current code. None of that is visible in a walkthrough, and none of it is the homeowner’s fault, but it all has to be fixed once the walls are open and the county inspector sees it. Homeowners who file with Chino Hills by mistake get red-tagged and lose weeks re-pulling the permit under San Bernardino County. We’ve watched it happen to neighbors. We start with an inspection, write realistic allowances into the contract, and every surprise gets a written change order with photos and pricing before we touch it. No one gets a bill they didn’t approve. That’s how Glen Pacheco runs every Los Serranos project.
A Real Job We Did in Los Serranos
On a 1985 two-story stucco tract home off Los Serranos Road, our crew opened a hall bath and found the original copper supply lines had been patched with polybutylene and the subfloor was soft from a decade of slow leaks around a no-flange shower drain. We wrote a change order with photos, priced the framing and waterproofing repair before touching it, and the homeowner approved it in writing the same day. Final inspection passed with the county on the first try because we had pulled the permit under San Bernardino County, not Chino Hills. That’s the difference local knowledge makes.
We Also Serve Cities Near Los Serranos
We run the same permit-aware remodeling process in Bathroom Remodeling in Los Serranos as we do in Chino, Yorba Linda, Montclair, and Pomona. If you’re just outside the 91709 ZIP or on the edge of the county line, call us and we’ll tell you exactly which jurisdiction your project falls under before you spend a dollar.
Serving Los Serranos, CA — Our Local Coverage Area
We’re based in the Los Serranos 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 Los Serranos
You need a San Bernardino County permit, because Los Serranos is unincorporated county land, not part of the city of Chino Hills. Filing with Chino Hills gets you red-tagged and costs you weeks. We pull the correct San Bernardino County permit on every Los Serranos project, and our inspections are scheduled through the county. Call (877) 801-4497 and we’ll walk you through what your specific scope requires.
Most commonly, aluminum branch wiring, no waterproofing membrane behind tile, improperly sloped shower pans, and sometimes polybutylene water lines. Homes built in Los Serranos during that era share consistent shortcuts, and the county requires most of them to be corrected once walls are open. We budget realistic allowances up front instead of pretending those things don’t exist.
We photograph everything, write a priced change order, and wait for your written approval before we touch the repair. You’ll see exactly what we found, what it costs, and why it has to be fixed. Nobody gets a surprise bill. That’s standard on every Los Serranos job we run.
Yes, if you’re adding square footage or doing a bump-out on a hillside lot, the county can require drainage review and fire-hazard-zone conditions that flat-lot projects never face. But a standard interior bathroom remodel without footprint changes usually avoids those triggers. We’ll tell you early whether your lot is in a review zone.
Because summers at the base of the Chino Hills are significantly hotter than coastal LA, and many 1980s tract homes don’t have HVAC runs reaching the bathroom. Adding a small ductless mini-split costs $3,000 – $5,000 but gives the bathroom its own cooling zone. For larger bathrooms or bathroom-adjacent ADU conversions, it’s the difference between a usable space and a humid box in August. Call (877) 801-4497 for a site-specific recommendation.
Get Your Free Los Serranos Bathroom Remodel Estimate
If you live in the 91709 ZIP and you’re planning a bathroom remodel, the fastest way to get real numbers is a phone call. We’ll ask about your house’s age, your lot, and what you want to change, then give you a line-item estimate that covers permit, demo, waterproofing, finishes, and any likely code corrections. Call (877) 801-4497 to schedule your free estimate. We work the 71 corridor constantly and we know exactly which jurisdiction your project falls under.
Written by Glen Pacheco, Owner at Fullerton ADU Builders, serving Los Serranos and the 91709 ZIP.