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Schluter Home Additions & ADU: The Riverside Owner’s Guide
If you’re planning a Schluter home addition or ADU in Riverside, you’re looking at an installed project cost between $90,000 and $220,000 for an accessory dwelling unit, or $45,000 to $130,000 for a standard home addition. Those are the numbers we see across Riverside, from the Wood Streets to Canyon Crest, and they include the Schluter waterproofing and uncoupling systems that keep tile, shower bases, and flooring from failing inside that new square footage.
Most Riverside homeowners don’t discover a Schluter problem until the tile cracks, the shower pan leaks, or the floor feels soft underfoot. By then, the failed part is buried under finished work. That’s why we treat Schluter installation as a structural commitment, not a flooring afterthought. The membrane under your tile is the part nobody sees, and it’s the part that determines whether your addition holds up for fifteen years or starts failing in five.
Key takeaways:
- Schluter home additions and ADUs in Riverside run $45,000 – $220,000 depending on scope
- Schluter membranes fail most often from improper substrate prep, wrong thinset, or skipped expansion joints
- Bradford Remodeling is an independent Riverside contractor, not a Schluter dealer or affiliate, and we install Schluter systems to manufacturer spec
- Every project gets a written price before work starts and the 365-Day Done Right Promise in writing
Which Schluter Models This Applies To
Schluter makes a full line of uncoupling membranes, waterproofing boards, and shower systems. The ones we install most in Riverside additions and ADUs are DITRA and DITRA-HEAT for floors, KERDI and KERDI-BOARD for showers and wet areas, and Schluter shower trays and curbs for tub-to-shower conversions. Each one has specific thin-set requirements, and that’s where we see failed installations from other crews. DITRA needs unmodified thinset between the membrane and the tile. Modified thinset traps moisture and never cures properly. That’s a compatibility gotcha that shows up as cracked or loose tile within two to three years.
If you’re checking an existing Schluter install, the product name is printed right on the orange membrane. KERDI-BOARD is a foam panel with a fleece face. DITRA has the distinctive grid pattern. If you’re replacing a section, don’t just match the product name. Match the thickness. KERDI-BOARD comes in 3/16″ to 2″ panels, and using the wrong thickness for a shower bench or niche backing changes the tile plane.
For Schluter specifically, we recommend OEM membranes and boards. Aftermarket uncoupling products exist, but Schluter’s warranty only applies when the full Schluter system is used, and in a Riverside ADU where the shower base sits over living space, the only safe call is manufacturer-spec materials. KraftMaid, Cambria, and Silestone are three other brands we work with on these projects, so the cabinetry, countertops, and surfaces all line up under one scope.
Styles & brands we work with
Signs Your Schluter Home Additions & ADU Is Failing
- Soft spots in the tile floor. This means the plywood substrate underneath the DITRA has swelled or rotted from moisture, usually water getting in at the edges or through a plumbing leak. The membrane itself may still be intact, but the structure under it is failing.
- Cracked grout or tile in a straight line. Straight-line cracks mean movement. Either the subfloor was underbuilt for the tile span, or an expansion joint was skipped. Riverside’s temperature swings between summer and winter put real stress on tile assemblies, and areas near large glass doors are the first to show it.
- Damp or musty smell near the shower base. That’s water wicking under the tile and into the mortar bed. KERDI waterproofing only works if the seams are lapped correctly and the drain flange is sealed. If the smell is in the wall behind the shower, the waterproofing there was never done right.
- Hollow-sounding tile when tapped. Tile that rings hollow has lost its bond. With Schluter systems, this is almost always a thin-set problem, either the wrong type for the membrane or the mortar skinned over before the tile was set.
- Standing water in the shower pan that won’t drain. Schluter drains have a specific fleece collar that bonds to the KERDI membrane. If the pan wasn’t sloped correctly or the collar was installed backwards, water pools and sits. In a Riverside ADU with a compact bath, that standing water eventually finds its way through the grout and into the framing.
Replacement Cost & What’s Included
For a full Schluter home addition or ADU in Riverside, you’re looking at $45,000 – $130,000 for an addition or $90,000 – $220,000 for an ADU, and that’s the lead number on this page. Now, what does that actually cover? The framing, electrical, plumbing, drywall, and finishes, plus the Schluter waterproofing and uncoupling systems installed to manufacturer spec. We don’t give a price and then move the number at the door. Your written price includes everything we’ve scoped, and if we find something the walls are hiding, we document it and bring it to you before we touch it. No surprises at the final walk.
Here’s how the line items break down in Riverside:
| Work | Installed Price Range |
|---|---|
| Home Addition (full scope) | $45,000 – $130,000 |
| ADU Construction | $90,000 – $220,000 |
| Garage Conversion | $30,000 – $80,000 |
| Walk-In Shower (Schluter system) | $4,500 – $12,000 |
| Kitchen Remodel (within the addition) | $14,000 – $45,000 |
Every completed project carries the 365-Day Done Right Promise in writing. If the Schluter system or any other part of our work fails within that year, we come back and correct it at no charge. That’s the guarantee, stated exactly, every time.
See the difference
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AfterDIY or Call Us?
Full disclosure from Curtis Lane, who’s been running crews across Southern California for the better part of three decades: a home addition or ADU is not a DIY project. The Schluter part of it lives inside the walls and under the floors, and the failure mode is silent. You won’t know the waterproofing seam failed until your subfloor rots and your tiles start moving.
If you’re just trying to diagnose a problem, there are a few things you can safely check. Pop a vent cover and look for water staining on the subfloor. Listen for hollow spotstapping tile with a wooden spoon. That’s about as far as I’d want a homeowner to go. Once you’re lifting tile or cutting into a shower pan, you’re in licensed contractor territory, and Riverside code requires permits and inspections on any addition or ADU work. We handle the permitting, the inspections, and the sequencing. Concrete doesn’t care what you budgeted, and framing doesn’t care how busy you are. The job runs in order or it doesn’t run right.
If you’re seeing signs of a failing Schluter system, call (424) 567-8472 and we’ll come take a look. The estimate is free. The written price is the written price.
Not sure if it’s the Schluter membrane or the substrate?
We’ll figure that out on site. Most failed Schluter installs in Riverside are substrate problems hiding under the orange membrane, not the membrane itself. We identify the root cause before we give you a number.
FAQs
A properly installed Schluter KERDI shower system should last 20 years or more, even with Riverside’s hard water and temperature swings. The catch is “properly installed.” The membrane itself won’t fail. The installation will. That’s why we pull the current California Building Code off the seat of the truck when a number needs backing up.
Sometimes. If the failure is isolated to a single seam or corner, a targeted KERDI patch can work. But if water has been sitting in the substrate, the rot determines the scope. In Riverside, we’ve seen small corner failures turn into full pan replacements because the water had months to do its work. Our repair estimates are itemized so you see exactly what we found and what must be replaced.
No. You get a written price before any work starts. The only way a number changes is if you change the scope or we open the walls and find something that changes the scope. In that case, we stop, document it, and bring you a change order in writing before we do anything else. No numbers move at the door.
We stock common Schluter membranes, corners, and drain flanges on our Riverside trucks, and we order project-specific pieces like shower trays and niches before we start. That sequencing is part of how we run. Subs show up when they’re supposed to, materials are on site before the crew is, and the punch list gets closed before we call the project done.
A full Schluter shower or wet-bath install takes three to six days, including cure times for the thin-set and waterproofing. The full ADU project timeline moves on a schedule we write into the scope, with dates and dependencies spelled out. You’ll know what’s happening and when, in writing.
Get a Straight Number for Your Schluter Addition or ADU
If you’re planning a home addition or ADU in Riverside, or your current Schluter install is showing cracks, moisture, or soft tile, call us at (424) 567-8472. We’ll walk the project, give you a written estimate, and put the 365-Day Done Right Promise in writing before a single tool comes out. A live person answers the phone 24 hours a day, seven days a week. Straight number, real scope, no surprises at the final walk.
Written by Curtis Lane, Owner, Bradford Remodeling Co Riverside at Bradford Remodeling Co Riverside, serving Riverside and nearby areas.
