Fast, Reliable Bathroom Remodeling Across Montclair
Bathroom remodeling in Montclair typically runs $14,000 to $38,000 for a full gut-and-rebuild, with smaller refreshes starting around $9,000 and master baths with structural work reaching $55,000 or more. The price moves most often because Montclair’s mid-century homes hide plumbing and electrical conditions that surface work never touches until the walls are open. If you’re weighing a remodel on a 1960s ranch near Monte Vista Avenue or a tract home off Holt Boulevard, call us at (866) 251-7857. We’ll walk the project with you before any number goes on paper.
Why Foundry ADU Builders Is Montclair’s Preferred Bathroom Remodeling Company
Foundry ADU Builders approaches Bathroom Remodeling from a builder’s perspective, not a surface-finish perspective. That matters in Montclair, where the homes are 50 to 70 years old and the real work is usually behind the tile. Our team has remodeled baths across the 91763 zip code, from the ranch neighborhoods north of the 10 to the compact tracts east of Central Avenue, and the pattern is consistent: the framing and waterproofing need as much attention as the fixtures.
Rob Cafferty runs our operation out of Brea, twenty minutes from Montclair, and he has built the company around one contractor relationship from shell to finished interior. When a Montclair homeowner calls with a bathroom that has a soft spot in front of the tub or a shower that has been leaking into the subfloor, we send a crew that knows what they are looking at before they pry the first tile. That is the difference between a quote that holds and one that doubles mid-job.
We pull permits, write line-item allowances into every contract, and put surprise findings in front of you with photos and a fixed number before any extra work begins. If you are in Montclair and want a contractor who treats your 1962 ranch as something to be opened up carefully, not demoed blindly, call (866) 251-7857 for a free estimate.
Our Bathroom Remodeling Services in Montclair
Full Bathroom Gut Remodel and Re-Tile
A full gut in a Montclair home means removing everything to the studs, repairing or replacing framing, and rebuilding the waterproofing system before tile goes back. In these mid-century bathrooms, the original mud-set tile bed is often the only thing holding a water-damaged subfloor together. We rebuild with modern cement board, membrane waterproofing, and a slope-corrected shower pan, then finish with the tile and fixtures you have actually selected. This is the right scope for any Montclair bathroom where the shower has been in use for 30 or more years.
Wet-Wall Plumbing and Drain Stack Replacement
The wet wall is the vertical plumbing chase behind your tub, shower, and vanity. In Montclair’s 1950s through 1970s homes, that wall usually contains galvanized supply lines and a cast-iron drain stack that are at or past their service life. A permit-triggered remodel in Montclair often requires replacing that entire assembly, because corroded galvanized stubs will not pass a pressure test and split cast-iron hubs will not pass a leak test. We open the wet wall, repipe with PEX, replace the stack with ABS, and get it inspected before any tile work proceeds. Skipping this step means tiling over plumbing that will fail inside your new walls.
Permit-Driven Electrical and Exhaust Fan Upgrades
Montclair’s original 100-amp panels were sized for a single-family home with minimal bathroom load. The code requires GFCI protection on bathroom receptacles and a dedicated circuit for the exhaust fan, and once the inspector sees what is there, the electrical scope grows. We plan for this in the estimate rather than discovering it mid-demolition. Upgrading the bathroom circuit, adding the fan on its own breaker, and ensuring the panel has capacity for the new load is standard scope on most of our Montclair bathroom remodels. This is not an upsell. It is what the permit requires.
Accessible and Aging-in-Place Bathroom Retrofits
Many Montclair homeowners are remodeling with the intent to age in place, particularly the quarter of residents over 55. A curbless shower, a 36-inch door, blocking in the walls for grab bars, and a handheld shower slide bar can all be built into the original scope without changing the look of the room. We do these retrofits often, because the wide lots and single-story layouts that make Montclair ADU-friendly also make it a sensible place to stay. The plumbing and framing upgrades we already handle become the foundation for accessibility work.
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 Montclair
We work with the materials that hold up in Montclair’s heat and dry air. James Hardie fiber cement is a standard for our exterior ADU cladding, and we use the same standard of durability when selecting bathroom backer board and waterproofing systems. For ADU projects that include a bathroom, we match the build method to your lot and budget, including Tuff Shed conversions and Plant Prefab units, and we carry the interior finish work from rough plumbing to final trim. You get one contractor who understands both the shell and the shower.
Common Bathroom Remodeling Problems We See in Montclair Homes
- Failed shower pans hiding rot: A shower pan from the 1960s or 1970s is often a lead or copper liner that has been leaking for years. The subfloor under it is usually spongy, and the framing below shows water staining. Re-tiling over that without replacing the pan and the damaged framing is a short-term fix that a permit inspection will catch.
- Galvanized supply lines that fail under pressure: Montclair’s mid-century homes were plumbed with galvanized steel that corrodes from the inside out. Once a wall is open, the existing supply stubs often will not hold a cap or a new valve, which forces a repipe of at least that bathroom’s supply run. We budget for this as a written allowance rather than surprising you later.
- Cast-iron drain stacks with split hubs: The vertical stack behind the tub in a 1960s Montclair ranch is typically original cast iron with leaded joints. Age, ground movement, and the dry summers have taken a toll. A leak test after rough-in frequently reveals a split hub or a cracked section that must be replaced before inspection.
- 100-amp panels with no bathroom capacity: A 1963 ranch on a wide Montclair lot might have a two-bedroom, one-bath electrical layout that was never designed for a modern bathroom. Adding a dedicated fan circuit, GFCI outlets, and vanity lighting can push an original 100-amp panel past its limit, triggering a panel upgrade as part of the permit.
Pricing for Bathroom Remodeling in Montclair, CA
Here is what we see across Montclair as of 2026. A guest or hall bath refresh with new vanity, toilet, fixtures, and surface-level tile runs $9,000 to $16,000. A full gut remodel of a standard 5×8 hall bath, including wet-wall plumbing replacement, new waterproofing, tile, and electrical, lands between $18,000 and $30,000. Master baths with larger footprints, custom tile, a curbless shower, or framing repairs run $32,000 to $55,000. The single biggest driver in Montclair is the wet-wall and drain-stack condition, because mid-century plumbing is usually at end of life. The moment a permit is pulled, that work becomes mandatory rather than optional.
We write every quote with allowances for hidden plumbing and framing so the number on the contract is the number you can plan around. Call (866) 251-7857 for a free estimate on your Montclair bathroom remodel. We will look at the space, discuss scope, and give you a written line-item quote before you commit to anything.
We Also Serve Cities Near Montclair
Foundry ADU Builders regularly works in Claremont, Ontario, Upland, and La Verne, with the same permit-first, inspection-heavy approach we bring to Montclair jobs. If your home is in one of those cities and shares the same mid-century construction profile, call (866) 251-7857 and ask about Bathroom Remodeling options for your specific house.
Serving Montclair, CA — Our Local Coverage Area
We’re based in the Montclair area and know this community well, and we offer Cover service in Montclair. Use the map below to see our service coverage — if you’re nearby, we can almost certainly help.
FAQs – Bathroom Remodeling in Montclair
Because Montclair’s housing stock is predominantly 1950s to 1970s construction, and the plumbing and framing inside those walls are usually at or past their service life. Galvanized supply lines, cast-iron drain stacks, and water-damaged subfloor are the most common discoveries. A surface-level quote never accounts for them. We include written allowances in every contract so the final number is a known range, not a surprise. Call (866) 251-7857 for a quote that anticipates what is actually behind your tile.
Yes. Any remodel that moves plumbing, changes the electrical layout, or alters structural framing requires a city permit. In Montclair, pulling that permit triggers inspection of the existing wet wall, the electrical circuit, and the waterproofing system. If the original plumbing does not pass pressure testing or the electrical does not meet current GFCI and dedicated-circuit requirements, those items must be corrected as part of the permitted scope. We pull all permits, schedule inspections, and bring the work to passing condition.
Not if you are pulling a permit. The galvanized supply lines and cast-iron drain stacks in a mid-century Montclair ranch are typically at end of life, and the moment the inspector requires a pressure test, the existing materials fail. You can choose a surface-level refresh without a permit, but you are tiling over plumbing that will leak inside your new walls. Our recommendation is to plan for the wet-wall replacement in the original budget. Call (866) 251-7857 and we will explain what your specific home likely needs.
We stop work, document the condition with photos, and give you a written change order with a fixed price before any additional work begins. That is how we handled a 1960s ranch off Holt Boulevard near the Montclair Plaza side of town, where our crew opened a hall bathroom and found galvanized supply stubs corroded shut, a cast-iron stack with a split hub, and framing softened by a failed shower pan. We wrote up the findings, got written approval for a PEX repipe, a new ABS stack section, and sistered framing, and then continued on schedule. The approval process takes a day, not a week.
Plan on $18,000 to $30,000 for a full gut remodel of a standard hall bath in Montclair, including the wet-wall plumbing replacement that most mid-century homes require. A master bath with custom tile and framing repairs runs $32,000 to $55,000. A surface-level refresh without opening walls starts around $9,000. The permit-driven plumbing and electrical upgrades are the biggest single variable, and they are predictable if the contractor looks at the house before quoting. Call (866) 251-7857 for a free estimate with real line items.
Written by Rob Cafferty, Owner at Foundry ADU Builders, serving Montclair and the surrounding Inland Empire.