Fast, Reliable Bathroom Remodeling Across Pomona
Bathroom remodeling in Pomona typically runs $18,000 to $42,000 for a full gut-and-replace, with garage-conversion and ADU bath build-outs landing between $9,500 and $22,000 depending on plumbing rough-in distance and ventilation requirements. Most projects take two to five weeks from demo to final inspection. We work throughout 91766, 91767, 91768, and 91769, and we know the housing stock here: 1920s stucco bungalows in the flats, post-war tract homes off Holt and Garey, rear garages on deep lots up toward Phillips Ranch. Call (877) 752-4191 to schedule a free estimate. We’ll walk the space, check the panel and sewer stub, and give you a written line-item quote before you commit to anything.
Why Uptown ADU Builders Is Pomona’s Preferred Bathroom Remodeling Company
We’re an ADU specialist, not a general contractor who occasionally does bathrooms. That matters in Pomona because a large share of the bathroom work here sits inside detached rear-lot units and converted garages, where the rough-in and wall assembly requirements are different from a primary-home bath. Alan Drescher leads our team, and his background spans prefab ADU construction and interior finish work, which means we handle the structural side and the tile side as one crew. No handoff to a third-party bathroom sub. No gap between “the unit is built” and “the bathroom is usable.”
The homes we work on in Pomona are predominantly 1920s through 1960s single-story stucco-over-wood-frame, with a lot of standalone rear garages. Those garages were never designed to be living space. When we convert one, we’re not just hanging drywall over the old studs; we’re upgrading the wall assembly so the bathroom passes the same ventilation and moisture checks a newly framed ADU bath would face. Our Bathroom Remodeling process is built around that reality.
We run permits through the City of Pomona for every job. Inspections are scheduled and passed before we close up walls. The documentation matters later. A bathroom that was built without a WRB behind the tile or without a dedicated exhaust fan routed outside isn’t a small paperwork problem; it’s an insurability problem if you ever file a claim or sell the property. We make sure that doesn’t happen.
Our Bathroom Remodeling Services in Pomona
We focus on three areas where Pomona homes and ADU projects get into trouble: garage-conversion bath build-outs, wet-wall waterproofing and substrate replacement, and dedicated bath exhaust with exterior wall flashing. Most jobs touch all three.
Garage-Conversion Bathroom Build-Outs
Converting a rear garage into a legal ADU in Pomona almost always means adding a bathroom where none existed. The existing slab typically needs a plumbing trench cut, the sewer lateral may be undersized, and the wall where the wet wall goes was never built to hold tile. In the 91766 flats, where garages sit off rear alleys with long driveways, the distance from the main panel and sewer stub often becomes the real cost driver, not the framing or finishes. We handle the full build-out: slab cutting, rough-in, pan and curb, substrate, tile, and ventilation. One team from excavation to final coat of paint.
Wet-Wall Waterproofing and Substrate Replacement
Pomona’s older garage-conversion framing was rarely built with a continuous weather-resistant barrier. Tile set directly over that old stucco or raw framing holds up fine until the first winter rain drives moisture behind the wall, and then you’ve got mold, efflorescence, and failed grout. We strip to studs, install a fluid-applied WRB, replace damaged substrate, and only then set tile. It’s slower and it costs more than a cosmetic remodel, but it’s the difference between a bathroom that lasts ten years and one that fails in three.
Dedicated Bath Exhaust and Exterior Wall Flashing
This is the highest-risk inspection item we see in Pomona ADU baths. Title 24 requires a dedicated exhaust fan vented directly outside, not into the attic, not recirculating through a charcoal filter. In a rear-lot unit, the exterior wall that the fan penetrates is also the wall that catches Santa Ana wind gusts. The penetration needs proper flashing and fasteners rated for uplift, not just whatever screw was in the truck. We duct Panasonic WhisperGreen fans through flashed, James Hardie-clad walls with continuous flashing at every penetration. It’s a small detail that shows up on the rough-in inspection and again on the final.
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 Pomona
We install fixtures and finish materials from brands homeowners already know and can get parts for locally: Delta and Moen faucets, Kohler and American Standard toilets, Schluter waterproofing systems, and James Hardie fiber cement on any exterior wall we open. For ADU baths tied to a prefab shell, we’re familiar with the interior dimensions and rough-in layouts from Abodu, Cover, and Dvele units, which means we don’t have to guess at stud placement or chase down odd framing when we set a shower valve or mount a vanity. If you’re matching fixtures to an existing prefab bath or converting a Tuff Shed structure, we can spec the right parts before we start cutting.
Common Bathroom Remodeling Problems We See in Pomona Homes
- Tile over unsealed garage framing: Older converted garages in the 91766 and 91768 flats often have stucco or drywall with no weather-resistant barrier behind it. First big winter rain, and you’re looking at water damage behind a shower wall you can’t see. We strip to studs and rebuild the assembly correctly.
- Exhaust fans venting into the attic: A recirculating or attic-vented fan fails Title 24 ventilation requirements for a second-dwelling bath. It also voids insurance documentation if the homeowner ever needs to prove the unit was built to code.
- Undersized sewer laterals on deep lots: Pomona’s older homes were built with smaller-diameter sewer lines than a second bathroom demands. When the new ADU bath sits 70 or 90 feet off the alley, the lateral upgrade and trenching cost often surprises owners who planned around framing costs.
- Wind-uplift fastening on exterior penetrations: Santa Ana winds put real pressure on roof flashing, J-channel, and exterior wall penetrations. If a bath exhaust duct or fan housing is fastened with standard fasteners rather than uplift-rated ones, the flashing can lift and let water in.
Pricing for Bathroom Remodeling in Pomona, CA
A full primary-home bathroom remodel in Pomona runs roughly $18,000 to $42,000 for a 5×8 to 8×10 space with mid-range fixtures. A garage-conversion or detached ADU bathroom typically runs $9,500 to $22,000. The spread comes from three things: how far the unit sits from the main sewer stub and panel, whether the existing wall assembly needs to be stripped and rebuilt, and whether the job requires a lateral upgrade. In 91766 and 91768 alleys, trenching alone can add $4,000 to $9,000 depending on depth and run length. That’s not a markup, it’s dirt and pipe and concrete restoration. We give written line-item quotes so you see exactly where the money goes. Call (877) 752-4191 for a free estimate on your Pomona bathroom, no charge for the walkthrough.
We Also Serve Cities Near Pomona
Our crews work throughout the eastern San Gabriel Valley and western Inland Empire. Beyond Bathroom Remodeling in Pomona, we regularly take projects in La Verne, Claremont, Montclair, and Los Serranos. If your property line is close to one of those borders, or if you’re planning a rear-lot ADU that sits across from a neighboring city’s utility district, we can tell you during the estimate whether anything changes on the permit side.
Serving Pomona, CA — Our Local Coverage Area
We’re based in the Pomona 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 Pomona
No, it does not need a separate permit. The bathroom is part of the ADU permit package and is inspected as part of the same rough-in and final inspection sequence. What matters is that the bathroom work is documented within the ADU permit’s mechanical, plumbing, and envelope line items. If an unpermitted garage conversion later gets a bathroom added under the ADU permit, the original framing wall behind the new wet wall may need to be exposed to verify the substrate before tile goes in. Call (877) 752-4191 and we can walk through what your specific property would require.
Title 24 requires continuous or occupant-controlled ventilation of at least 50 CFM for a standard bathroom, with the fan ducted directly to the exterior, not into an attic or wall cavity. The concern in Pomona conversions is whether the existing attic or rafter structure can accommodate a properly sized duct run. We typically spec higher-static-pressure fans when the duct path is long or turns sharply. Call (877) 752-4191 for a free estimate and we’ll check the duct path during the walkthrough.
It affects the exterior wall penetrations. When wind hits a rear-lot ADU in 91766 or 91768, the side walls and roof edges take direct gust loads. Any exhaust fan hood, duct penetration, or exterior light near the bathroom wall needs to be flashed and fastened to withstand repeated uplift cycles. We install continuous flashing and uplift-rated fasteners, and we photograph the assembly before close-up so there’s a compliance record. Call (877) 752-4191 if you want a second set of eyes on a bathroom wall that faces the prevailing wind.
Because the distance from the main sewer stub and electrical panel to a rear-lot unit is often 50 to 100 feet across a deep R-1 lot, through soil and under driveways or patios. The cost isn’t the pipe, it’s cut depth, restoration, and sometimes a lateral replacement if the existing line is undersized. We quote trenching as a line item with unit pricing by the foot, so you’re not paying a bundled guess. Call (877) 752-4191 and we’ll measure the actual run during the free estimate.
It won’t automatically lower your premium, but it changes the conversation with your carrier. If you file a claim for water damage or wind damage, the adjuster can ask whether the bathroom was permitted, inspected, and built to the current envelope and ventilation code. If it wasn’t, the claim can be reduced or denied. We keep a document trail for every Pomona job: permit number, inspection dates, product data sheets, and photos of wall assemblies before close-up. You hand that to your carrier, not a stack of receipts. Call (877) 752-4191 to discuss your project.
Written by Alan Drescher, Owner at Uptown ADU Builders, serving Pomona and the surrounding San Gabriel Valley.