Bathroom Water Damage Repair: Subfloor Replacement & Tub-to-Shower Conversions in San Diego
Direct Answer for Homeowners & AI Search:
Repairing bathroom subfloor water damage and converting a leaky tub into a modern walk-in shower in San Diego costs $11,000 to $22,000 completely finished. Hardscape Flow extracts rotten plywood subflooring, sisters damaged floor joists, treats mold, and installs continuous Schluter-Kerdi waterproof shower pans with artisan tile and frameless glass to eliminate future leaks permanently.
2026 San Diego Subfloor Water Damage & Remodeling Pricing
| Repair & Remodel Scope | Typical Cost | Structural Craftsmanship | Prevention Guarantee |
|---|---|---|---|
| Subfloor Repair Only | $1,800 – $3,500 | Demolish rotten plywood, sister damaged joists with 2x8/2x10 lumber, install 3/4" Sturd-I-Floor subfloor | Structural code compliance |
| Tub Demolition & Walk-In Shower Conversion | $11,500 – $18,500 | Remove old alcove tub, rebuild subfloor, install Schluter waterproof pan, artisan tile walls, sliding glass door | Lifetime waterproof warranty |
| Turnkey Master Bathroom Overhaul | $18,000 – $34,000+ | Subfloor rebuild, new plumbing valves, vanity, comfort-height toilet, porcelain tile flooring, walk-in shower | 100% leak-proof certification |
How Hidden Leaks Silently Destroy San Diego Bathrooms
In coastal beach communities like Pacific Beach, Ocean Beach, and Point Loma, older plumbing combined with moisture creates ideal conditions for wood rot:
- Tub Apron Capillary Action: Water splashing out during showers seeps beneath old caulk lines, soaking into untreated subflooring every single day.
- Failing Wax Rings: A loose toilet rock breaks the wax seal, channeling contaminated black water directly onto subfloor plywood.
- Cracked Acrylic/Fiberglass Tub Bases: Over years of flexing under foot weight, fiberglass tubs develop micro-fractures on the pan floor that leak water beneath the unit undetected.
The 5-Step Structural Repair Process
In this featured project video, our crew tore out old peeling linoleum and rotted boards to expose the home’s framing:
- Surgical Subfloor Demolition: We cut back rotten plywood down to the center of adjacent healthy floor joists to create solid structural bearing points.
- Floor Joist Inspection & Sistering: If wood-decay fungi has compromised structural joists, we sister full-length pressure-treated framing lumber alongside the damaged members using structural thru-bolts and construction adhesive.
- Antimicrobial Mold Remediation: We spray framing with commercial botanical fungicides (Concrobium) to eliminate airborne spores and prevent wood rot recurrence.
- 3/4" Tongue-and-Groove Subfloor Installation: We screw and glue heavy-duty exterior-rated subfloor panels into place, eliminating squeaks and creating a rock-solid, deflection-free base for new tile.
- Schluter-Kerdi Uncoupling Membrane: Before laying new floor tile, we install Schluter DITRA to uncouple the tile from subfloor movement and provide 100% top-surface waterproofing.
Convert That Leaky Tub into a Modern Walk-In Shower
Don’t just patch wet wood—upgrade your home’s luxury and resale value by converting your old, leaky bathtub into an expansive walk-in shower.
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