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Schluter Home Additions & ADU: The Fresno Owner’s Guide
Home additions and ADUs built with Schluter waterproofing and uncoupling systems in Fresno typically run $45,000 to $130,000 installed, depending on square footage, foundation work, and whether you’re adding a bedroom suite or a full detached unit. We stock the Schluter profiles, KERDI-band, DITRA membranes, and shower systems that most Fresno addition projects call for, and we can match existing Schluter work so the new section ties in clean. If your Schluter-related concern is a failed waterproofing layer, cracked tile at a transition, or a shower pan that’s letting water through, you’ve found the page that explains what it costs to make it right.
Most Fresno homeowners discover a Schluter failure the hard way: a soft spot in the subfloor near a tub, dark staining at the base of a newly tiled shower, or grout that keeps cracking no matter how many times it’s touched up. The part itself rarely fails in isolation. What fails first is usually the installation detail around it: the seam, the corner, the drain collar, the transition between old framing and new. We’ll walk through what that means for your project.
Which Schluter Models This Applies To
Schluter makes a defined family of waterproofing and uncoupling products, and the model matters more than most homeowners assume. The DITRA and DITRA-HEAT membranes are the uncoupling layers under tile. KERDI and KERDI-DS are the sheet waterproofing membranes for showers and steam rooms. KERDI-BOARD is the foam backer board that replaces cement board in wet areas. The shower systems, from the KERDI-SHOWER-LT to the KERDI-SHOWER-TT, are pre-sloped foam trays with matching drain assemblies. Home additions in Fresno that attach a new bathroom or expand a kitchen onto a slab will typically use DITRA over the new concrete, KERDI-BAND at every seam, and KERDI profiles at any floor-to-wall transition.
Here’s the compatibility gotcha that trips people up: KERDI and KERDI-DS are not interchangeable without checking the vapor transmission rating first. KERDI-DS is the thicker product for steam showers and continuous-use wet areas, and swapping one for the other in a Fresno ADU with a steam unit will void the Schluter assembly warranty and likely fail inside five years. If you’re not sure which membrane is behind your existing tile, the seam overlap pattern and the corner details usually give it away. We identify it on site before writing a single number.
On OEM versus aftermarket: Schluter’s own profiles and corners are precision-formed to match the membrane thickness, so generic off-brand corners rarely seal correctly. For Home Additions & ADU work, we install genuine Schluter. The membrane, the band, the corners, the drain collar: all Schluter, all from the same supplier run. That’s how the warranty holds. We also stock replacement Schluter parts for projects originally built with KraftMaid cabinets, Cambria or Silestone tops, and the other brands we service, so a new section doesn’t look like it was bolted on by a stranger.
Styles & brands we work with
Signs Your Schluter Home Additions & ADU Is Failing
- Efflorescence or dark staining at tile edges near the shower curb or exterior door. Water is wicking through an unsealed seam or a failed corner. In Fresno’s hot, dry summers, the water evaporates fast, leaving mineral deposits that signal the leak before the framing rots.
- Cracked or loose tile in a straight line across the floor. That line is usually a seam between two substrate panels. If the Schluter membrane wasn’t lapped correctly at that seam, movement from slab settlement transfers right through the tile.
- Musty odor in an addition or ADU that won’t clear, even with dry air. The smell is the insulation and framing holding moisture behind the tile or under the floor. By the time you smell it, the water has been there a while.
- Floor feels spongy or has visible deflection near the transition between old house and new addition. The two foundations move differently, and the Schluter layer is the one taking the stress. If the DITRA wasn’t set in the right thinset for Fresno’s slab conditions, it can delaminate.
- Caulk at the tub, shower, or vanity keeps pulling away from the wall. Caulk failure isn’t the disease; it’s the symptom. The wall assembly behind it is moving or holding moisture, and no amount of recaulking fixes the real problem.
See the difference
Before
After
Before
After
Before
AfterReplacement Cost & What’s Included
In Fresno, a full Schluter-based home addition runs $45,000 to $130,000 depending on whether you’re tying into an existing slab or pouring fresh footings, and whether the scope is a bump-out suite or a detached ADU with its own kitchen and bath. If the job is a targeted repair, say a failed shower pan or a compromised waterproofing membrane under an existing bathroom floor, the number is materially lower and we’ll give you a written line-item price before any work starts.
What drives the cost: the condition of the substrate underneath, the square footage of membrane being replaced, the number of seams and corners that need re-waterproofing, and whether we’re matching existing Schluter profiles or transitioning to a different finish. Parts are priced separately from labor on every estimate, so you see exactly what the membrane, band, corners, and thinset cost. That’s The Garrison Standard: a written price before work begins, with no numbers that move at the door.
| Project Type | Fresno Installed Range |
|---|---|
| Home Addition (with Schluter waterproofing) | $45,000 – $130,000 |
| ADU Construction (detached, full bath + kitchen) | $90,000 – $220,000 |
| Garage Conversion (Schluter shower + flooring) | $30,000 – $80,000 |
| Schluter Shower Pan Replacement (repair) | $4,500 – $12,000 |
Every completed addition or ADU carries our 365-Day Done Right Promise in writing. If the waterproofing fails, if the tile cracks at a seam, if water gets where it shouldn’t, we come back and correct it at no charge. You get the signed guarantee in your hand at close, along with the documented scope of what we built.
DIY or Call Us?
You can safely check the visible things: run water along the shower floor and watch where it pools, look for cracked grout lines that follow a straight path, check for soft drywall at the base of the shower curb. What you should not do is pull up tile to inspect the membrane yourself. Once you break the tile, you’ve broken the waterproofing assembly, and a partial fix on Schluter is worse than no fix because the seams you can’t see are the ones that leak.
Schluter systems are unforgiving about prep and sequence. The right thinset, the right trowel notch, the right seam overlap, the right cure time before tile goes down. Get one of those wrong and the failure shows up months later, after the tile is grouted and the job is “finished.” That’s why we stock the gear and do the work ourselves. If you’re staring at a water stain and wondering whether it’s time to call, it’s time. Call (559) 785-2712 and we’ll send someone who can tell you what’s actually failing.
FAQs
A properly installed Schluter assembly should last 30 to 50 years, but the lifespan depends on prep and seam work more than the membrane itself. In Fresno’s hot, dry climate, the main threat is slab movement and thermal expansion between conditioned and unconditioned spaces, which stresses seams over time. Call (559) 785-2712 if you suspect a seam is letting go; we’ll diagnose it before it spreads.
Most failed shower pans need replacement rather than repair because the waterproofing is a continuous membrane, and a patch creates a new seam that will fail next. If the failure is isolated to a single corner or drain collar and we can verify the rest of the assembly is sound, a targeted repair is possible. The estimate says what we build, and we build what the estimate says. Call (559) 785-2712 for an on-site assessment.
A shower pan replacement typically takes 5 to 7 working days including demolition, subfloor prep, membrane installation, flood test, and tile. A full home addition runs 3 to 6 months from permits to close. We pull the permits, we schedule the inspections, and you get a written timeline before we start. Call (559) 785-2712 to get a real schedule, not a guess.
We keep DITRA, KERDI-BAND, corners, drain collars, and profile pieces on the truck for common repair and addition work in Fresno. If your project calls for a specific profile finish or a larger membrane roll than we carry, we’ll have it from our supplier within a couple of business days and we’ll tell you that before you sign anything. Call (559) 785-2712 and we’ll confirm what’s in stock for your project.
Bradford Remodeling Co Fresno is an independent remodeling contractor, not affiliated with Schluter Systems. We install and service Schluter products alongside the other premium brands we work with, including KraftMaid, Cambria, and Silestone.
If your Schluter addition or ADU isn’t holding up, don’t wait for the water to find the next weak spot. Call Curtis Lane and the crew at (559) 785-2712 to schedule a free estimate. We’ll put the price in writing, tell you exactly what failed and why, and stand behind the fix for a full year.
Written by Curtis Lane, Owner, Bradford Remodeling Co Fresno at Bradford Remodeling Co Fresno, serving Fresno and nearby areas.
