Bathroom Mold Removal Bay Shore, Suffolk County Feb 24
Master bath — mold behind vanity and under tub. Removed, treated framing, installed closed-cell foam, new cement board. Homeowner insurance covered 80%.
Remediation Service
Bathroom Mold Removal on Long Island
Hidden behind tile, under vanities, and inside wall cavities — most bathroom mold comes from pinhole leaks that have been wet for years.
NYLMB Licensed
IICRC Certified
Same-week scheduling
Free Inspection Request
Get a same-week callback.
NYLMB Licensed · MA00534 / MR00612
IICRC CMR & AMRT Certified
4.9★ · 187+ Google Reviews
EPA RRP Lead-Safe
Since 2012 · 2,800+ Homes
Overview
Bathroom Mold Removal: what we actually do.
Visible bathroom mold (the stuff on caulk lines, grout, and behind toilets) is mostly a cleaning problem, not a remediation one. Real bathroom remediation starts when we open the wall behind a tub and find Stachybotrys growing on studs. The most common cause: a pinhole leak at a shower valve that's been dripping inside the wall for a year. We find it, fix it, and handle the mold.
When to call us
- Soft or discolored drywall around tub, shower, or toilet
- Peeling or bubbling paint on bathroom walls
- Black mold growth visible through grout or caulk gaps
- Musty smell in the bathroom that persists after cleaning
- Water stain on the ceiling of the room below
Our process
01
Diagnostic inspection
Moisture meter on all bathroom walls and floor. Thermal imaging to find cold (wet) spots. Visual inspection behind access panels, around tub valves, under vanities.
02
Expose + stabilize
Open the smallest access window needed — usually a 2×2 ft cut behind the tub or under the vanity. Stop the leak (we refer to a plumber if a plumbing repair is needed).
03
Remediate the cavity
Remove affected drywall, insulation, and any soft framing. HEPA-sand studs. Antimicrobial + encapsulation. Install backer board, closed-cell foam, new drywall with mold-resistant board on the wet side.
04
Water-management rebuild
New waterproof backer, new caulking with mildewcide, new tile or fiberglass if needed. We can handle the rebuild or coordinate with your tile guy.
05
Verification
Post-remediation verification air samples on request. Follow-up moisture-meter check 30 days later to confirm dryness.
The real causes we see in Long Island homes
Pinhole leaks at shower valves
The #1 cause we see. A hairline split at a soldered joint behind the wall drips 2 drops an hour for 18 months. Drywall stays wet. Stud colonizes. Owner notices when paint bubbles.
Failed tub or shower surround
Micro-cracks in grout or caulk let water migrate into the substrate. Cement board stays wet. Organic dust on top becomes food for mold.
Toilet flange leaks
Wax-ring failures that leak slowly under the toilet. Subfloor stays damp. Mold starts under the toilet and spreads.
Pricing
Small cavity repair with local demo: $800–$2,000. Full wall behind tub with structural work and rebuild: $2,500–$5,500. Master-bath gut + mold remediation: $5,000–$9,000.
Every quote is fixed after inspection — no hourly billing, no change orders unless the substrate reveals hidden contamination.See full pricing guide →
Field Log
Recent Bathroom Mold Jobs
Real jobs. Real towns. Actual scope and scale from our last 90 days of field work.
Bathroom Mold Removal
Bathroom Mold Removal Ronkonkoma, Suffolk County Nov 5
Second-floor bath, water-damaged subfloor, mold under vinyl. Removed finish, treated subfloor, reinforced joists, installed cement board.
FAQ
Questions homeowners ask about bathroom mold
Usually no. We can access the wet wall cavity through a small rear cut or by removing 1–2 tile courses around the affected area. Full tub removal only for severe structural damage.
Proper ventilation (bath fan vented through the roof, not into the attic), 20-minute fan runs after showers, yearly re-caulking of tub/shower perimeter, and fixing plumbing leaks immediately.
If there's a sudden plumbing failure that caused the mold, usually yes. If it's long-term leak-related 'maintenance' mold, usually no. We document either way.
We coordinate with licensed tile contractors we've worked with for years. Or you can use your own. We hand off a dry, level, remediated substrate ready to tile.
Small cavity repairs with localized demo run $800–$2,000. Full wall-behind-tub remediation with structural work and rebuild is $2,500–$5,500. A complete master-bath gut with mold remediation ranges $5,000–$9,000. We provide a firm written quote after inspection — no surprises.
Most bathroom mold jobs are completed in 2–4 days. Day one is demo and containment. Days two to three are treatment, drying, and encapsulation. Day four is final inspection and clearance testing. Tile rebuild by our tile partners adds 3–5 additional days depending on scope.
Black mold behind bathroom walls (often Stachybotrys or Aspergillus) produces mycotoxins that can trigger respiratory issues, allergic reactions, and chronic sinus problems — especially in children, elderly, and immunocompromised individuals. If you see soft, discolored drywall or smell persistent mustiness, don't delay inspection.
Not if the moisture source is fixed. We identify and eliminate the root cause (usually a plumbing leak), install mold-resistant materials (greenboard, closed-cell foam, mildewcide caulk), and verify dryness at 30-day follow-up. Proper ventilation and regular re-caulking prevent future growth.
More services
Related work we do.
Mold Remediation
Full IICRC S520 remediation — containment, HEPA filtration, removal, and clearance. Our core service. Long Island's housing stock — 1950s–70s construction with limited vapor barriers, poor attic ventilation, and South Shore flood exposure — creates persistent mold conditions that require professional remediation, not surface cleaning. We follow Category 3 containment protocol on every job: negative-air machines with HEPA filtration, zipper-door decontamination chambers, full PPE, and independent post-remediation verification (PRV) clearance before we close out. South Shore towns like Freeport, Merrick, and Valley Stream carry elevated mold risk from storm surge flooding. Nassau County Health Dept guidelines for mold remediation in occupied buildings require written scope, proper containment, and clearance testing on jobs over 10 sqft — we document every step for insurance and compliance purposes. Most residential remediation projects in Nassau and Suffolk run $2,000–$8,000. Post-flood jobs in South Shore towns can run $3,000–$12,000 depending on scope.
Read more →
Black Mold Removal
Emergency Stachybotrys removal with negative-air containment, respirator-grade crew, and PRV clearance testing.
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Attic Mold Removal
The #1 mold problem in Long Island homes — sheathing mold from blocked bath fans and under-vented roofs. We treat the wood and fix the ventilation.
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Basement Mold Removal
From crawl-space dampness to finished-basement flood damage. South Shore specialty — Sandy legacy and nor'easter water events.
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Crawl Space Mold Remediation
Vapor barriers, joist treatment, dehumidification — the three-step fix for chronic crawl-space mold in older LI homes.
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Post-Flood Mold Remediation
Category 3 water protocol — Sandy legacy cleanup, storm floods, basement nor'easter events. Insurance-documented from day one.
Read more →
Ready to breathe easier?
Same-week scheduling. Crew on-site in days, not weeks.
Free visual inspection, same-day estimate. Licensed assessor handles the test separately from remediation — NY Article 32 compliant from the first call.
Mon–Sun 7am–8pm · 24/7 emergency line