Fast, Reliable Bathroom Remodeling Across Montclair
Bathroom remodeling in Montclair typically runs $18,000 to $42,000 for a full gut-and-replace, with compact ADU baths landing between $14,000 and $22,000. Most Montclair projects take 3 to 5 weeks once permits clear, and the surprise factor here almost always traces back to what’s hiding behind 1950s and 60s drywall. We’re local to the Pomona Valley and we know exactly what Montclair’s housing stock turns up when walls open: galvanized drain lines, maxed 100-amp panels, and single-drain stacks that weren’t built for a second bathroom. Call (877) 265-9846 for a free estimate, and we’ll walk the job with you before you commit to anything.
Why Colonial ADU Builders Is Montclair’s Preferred Bathroom Remodeling Company
Montclair homeowners call us because we know this city’s houses. The post-war tracts near Ramona Avenue, the cul-de-sac pockets around Kingsley Street, the blocks running west toward the 91763 border with Pomona, they all share the same bones: single-story framing, tight lot lines, and plumbing that was state of the art in 1962. Our Bathroom Remodeling team has opened enough Montclair walls to know what’s coming before the demo hammer lands.
Noel Carrasco leads every Montclair job with a simple rule: inspect first, price in writing, get approval, then touch the work. That’s not a slogan. It’s how we keep a remodel from stalling when the drain line turns out to be corroded through at the trap arm. Montclair customers stay with us because the number we quote is the number they approve, and any change gets priced and signed before we move.
We carry our own crews for electrical, plumbing, framing, tile, and waterproofing. No sub hand-offs, no “the plumber will call you back.” One contract, one accountable team, one point of contact from demo to final caulk line.
Our Bathroom Remodeling Services in Montclair
Bathroom Remodeling
A full Montclair bath remodel means taking the room to studs and rebuilding it right. For most 1950s – 70s tract houses in 91763, that starts with an inspection of the drain stack and the breaker panel. We price the visible work up front and write the invisible work into a contract allowance, so when we open a wall and find early copper that’s paper-thin at the joints, you’re not blindsided. The finished product is a bath that actually functions for the next 40 years, not just one that photographs well.
Garage Conversion Bathroom
Montclair’s alley-loaded rear garages are the natural ADU play, and an ADU bath brings its own set of rules. The new drain and vent runs have to tie into the existing single-drain stack from the main house, routed within the lot’s tight easement, not redesigned from scratch. We’ve done this across Montclair’s rear-alley lots, including a garage-conversion ADU off a lane near the Pomona border where the original galvanized drain line had rotted through at the trap arm. We stopped, documented, priced the fix as an allowance change, and got approval before touching anything. That’s the discipline these jobs require.
Electrical & Plumbing Upgrades
Opening a Montclair bath wall almost always surfaces a 100-amp panel running at capacity, and adding a mini-split or an electric tankless heater pushes it over. We handle panel swaps, sub-panel additions, GFCI/AFCI circuits, and full drain re-routes in-house. Permits, inspection scheduling, utility coordination, all of it is ours. You’re not calling three trades; you’re calling one team that already knows Montclair’s code inspectors and what they’ll flag on a 60-year-old house.
Waterproofing & Shower Systems
Compact bathrooms live or die on waterproofing. Montclair’s hot inland summers mean more shower use, more humidity, and more stress on a failed pan. We build with full Schluter or equivalent surface-applied waterproofing membrane on every shower, not just a green board and hope. For ADU baths, where the whole footprint is tight, a failed pan doesn’t just ruin the tile, it triggers re-inspection and rework that kills the project budget.
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 spec and work with products from Cover, Dvele in Montclair, and Boxabl on ADU projects, and for standalone bath remodels we lean on the same standard we bring to any structure: materials that hold up to Montclair’s heat and hard water. Delta and Moen for fixtures, Schluter for waterproofing, James Hardie for any exterior wall work tied to a garage conversion. We keep lead times honest and we order for Montclair jobs early, because a backordered niche fixture is what turns a 4-week remodel into an 8-week one.
Common Bathroom Remodeling Problems We See in Montclair Homes
- Corroded galvanized or early-copper drain lines. Montclair’s 1950s – 70s stock was plumbed on a single-drain system, and the horizontal runs are often the first to rot. You won’t see it until the wall is open, and you won’t pass inspection if you leave it.
- Maxed 100-amp electrical panels. Adding a second bath, a vent fan, heated floor, or an electric water heater pushes an already-loaded panel past its rating. Montclair’s older homes rarely have spare breakers to give.
- Failed waterproofing from previous quick-flip remodels. A tile shower installed without a proper membrane might last five years in a mild climate. In Montclair’s summer heat and hard water, it fails faster, and the damage hides until the grout starts cracking.
- Permit-triggered code upgrades nobody budgeted for. Once you open the walls, the inspector will look at framing, wiring, and venting. If the original work doesn’t meet current code, you’re upgrading it whether you planned to or not. We price that reality into the allowance on day one.
Pricing for Bathroom Remodeling in Montclair, CA
Here’s the honest picture. A full hall-bath remodel in Montclair runs $18,000 to $30,000 for standard finishes, with a primary-bath or larger layout pushing $28,000 to $42,000. A compact ADU bath, the kind tied to a garage conversion, lands between $14,000 and $22,000. If the project triggers a panel upgrade, add $3,500 to $6,500. If the drain stack needs re-routing through an easement, that’s another $2,000 to $5,000. We don’t bid teaser numbers and then discover the truth after demo. Our contract includes a written allowance for walls-open surprises, and every allowance change gets priced and signed before we proceed. Call (877) 265-9846 for a free estimate and a line-item quote you can actually plan around.
We Also Serve Cities Near Montclair
Beyond Montclair, our crews cover Bathroom Remodeling in Montclair‘s neighboring communities including Claremont, Ontario, Upland, and La Verne. Same inspection-first process, same in-house crews, same written-allowance contract. If you’re close to the 91763 line, we’re likely already working nearby.
Serving Montclair, CA — Our Local Coverage Area
We’re based in the Montclair 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 Montclair
A Montclair bath remodel often costs more than the original quote because opening a 1950s – 70s wall surfaces problems no visual walk-through can catch: corroded galvanized drain lines, maxed 100-amp panels, and framing that doesn’t meet current code. We handle this by writing a contract allowance for walls-open surprises, and any change gets priced and approved in writing before work continues. Call (877) 265-9846 and we’ll show you exactly how the allowance works in your quote.
If your Montclair home still has a 100-amp panel and you’re adding a second bathroom, heated floor, or an electric water heater, there’s a strong chance you’ll need a panel upgrade to pass inspection. Montclair’s older tract homes were built when one bath and a few appliances were the norm. We check panel load during the initial inspection and price any upgrade into the allowance up front. Call (877) 265-9846 for a free load check and estimate.
Converting a Montclair garage into an ADU bath means tying the new drain and vent runs into the main house’s existing single-drain stack, then routing everything within the tight easement on your lot. We inspect the stack first, because Montclair’s original galvanized lines often fail at the trap arm. If the line is bad, we price the re-route as a written change before any work. Call (877) 265-9846 to have your garage and stack evaluated.
A bathroom permit in Montclair triggers upgrades to anything the inspector can see once walls are open: GFCI/AFCI circuit protection, venting that meets current standards, proper shower waterproofing, and framing corrections if the original work was undersized. Older single-drain systems will need to show proper slope and venting before the city signs off. We schedule and manage every inspection, so you’re not stuck interpreting a correction notice on your own. Call (877) 265-9846 with questions about your specific house.
We waterproof a compact ADU bathroom with full surface-applied membrane on every shower and wet area, not just cement board and hope. Small ADU baths are unforgiving: one failed pan ruins the entire conversion and triggers re-inspection. Schluter membrane or equivalent, full seam coverage, and flood-tested pans before tile goes in. Call (877) 265-9846 for an estimate that includes waterproofing done right, not skipped to save a few hundred dollars.
Written by Noel Carrasco, Owner at Colonial ADU Builders, serving Montclair and the Pomona Valley.