The Short Answer: What Mold Remediation Costs in New York

Professional mold remediation in New York State typically runs between $10 and $25 per square foot, depending on the scope, severity, location, and materials involved. At Post Trauma Scene Decon, our standard rate for mold remediation is $12 per square foot — a flat rate that covers assessment, containment, HEPA filtration, removal, treatment, and preventive coating.

The total cost on a typical residential job ranges from approximately $2,500 for a small contained area to $12,000 or more for whole-room or multi-room remediation. Large commercial or multi-family jobs are scoped individually.

Typical mold remediation cost ranges in New York

Job Type	Typical Area	Estimated Cost
Small area (bathroom, closet)	25–75 sq ft	$1,500–$3,500
Single room (basement, bedroom)	100–250 sq ft	$2,500–$6,000
Multi-room or whole-floor	300–600 sq ft	$5,000–$12,000
Crawl space remediation	Varies	$3,000–$8,000
Attic remediation	Varies	$2,500–$9,000
HVAC/ductwork treatment	Per system	$2,000–$5,000+

These are estimates for North Country, NY. Actual pricing requires an on-site assessment.

What the Per-Square-Foot Rate Actually Covers

When a certified remediation company quotes a per-square-foot rate, that number should be all-inclusive for the core scope of work. At $12 per square foot, our rate covers:

On-site assessment and scope documentation
Containment setup with plastic sheeting and negative air pressure
HEPA air filtration units running throughout the job
Full PPE for all crew members
Physical removal of all contaminated material
HEPA vacuuming of all affected surfaces
Antimicrobial treatment using RMR products
Preventive coating application to treated surfaces
Photographic documentation — before, during, and after
Written scope of work and completion documentation

Disposal fees for contaminated material are calculated separately based on volume and weight, in accordance with current St. Lawrence County and regional disposal rates. We disclose these upfront before any work begins.

What Drives the Cost Up

Not all mold jobs are the same. Several factors push the total cost beyond the base per-square-foot rate. Understanding these helps you interpret quotes accurately.

Location within the structure

Mold inside walls, under flooring, in attics, or in crawl spaces requires more time and material to access than surface mold. Contained spaces with limited airflow also require more intensive HEPA filtration. Attic and crawl space jobs often cost more per square foot than open basement work.

Severity and depth of contamination

Surface mold on a non-porous material can often be treated without removal. But mold that has penetrated drywall, wood framing, or subflooring requires physical removal of those materials — adding both material cost and disposal cost to the job.

Structural repair after remediation

When contaminated drywall or framing must come out, the space needs to be rebuilt. Remediation handles the contamination — reconstruction is typically a separate scope of work. We can recommend contractors, but the rebuild cost is not included in the remediation rate.

Scope creep discovered during the job

Mold often spreads further than it appears on initial inspection. When we open walls or remove flooring, we may find contamination that wasn't visible in the assessment. This is disclosed immediately with a revised scope before additional work proceeds.

Moisture source remediation

Mold cannot be permanently resolved without fixing the water intrusion that caused it. If the underlying leak, condensation issue, or flooding hasn't been addressed, mold will return. The moisture source fix is typically outside the scope of mold remediation — it falls under plumbing, roofing, waterproofing, or HVAC repair.

After-hours or emergency response

Mold jobs that require immediate response — following a flood or major water event, for example — may include a surcharge for emergency scheduling, especially on weekends or holidays. We itemize any such surcharges transparently on every estimate.

What Drives the Cost Down

Just as some factors push cost up, others work in your favor:

Early intervention — catching a mold problem before it spreads beyond the original area dramatically reduces scope and cost
Non-porous surfaces — mold on tile, concrete, or metal is less costly to treat than on drywall or wood because removal is not required
Single-room containment — a contained area without HVAC integration is simpler to remediate than a problem that has spread to air systems
Insurance coverage — qualifying jobs that are covered by homeowner's insurance significantly reduce your out-of-pocket cost

Does Homeowner's Insurance Cover Mold Remediation?

The most important variable in total out-of-pocket cost is insurance coverage. In New York, homeowner's insurance policies may cover mold remediation under certain conditions — specifically when the mold resulted from a sudden, accidental covered water event.

Generally covered by insurance:

✓Mold from a burst pipe or accidental appliance leak
✓Mold resulting from storm damage (broken window, roof damage, etc.)
✓Mold discovered during a covered claim for another type of damage

Generally NOT covered:

✗Mold from gradual moisture intrusion or deferred maintenance
✗Mold resulting from flooding (requires separate flood insurance)
✗Mold from chronic high humidity not tied to a specific covered event

We work directly with insurance adjusters and bill insurers for qualifying jobs. If you are unsure whether your situation is covered, call us first — we can help you determine whether to file a claim before we begin work. For a broader overview of how insurance works for remediation, see our article on what insurance covers for cleanup and remediation.

Why DIY Mold Cleanup Is Not a Cost-Effective Alternative

Store-bought mold sprays and bleach-based products are widely marketed as mold solutions. They are not. Here is why DIY treatment typically fails — and sometimes makes the problem worse:

Bleach kills surface mold but does not penetrate porous materials — the root structure (hyphae) remains inside drywall and wood
Disturbing mold without proper containment releases spores into the air and spreads contamination to adjacent areas
Consumer respirators and household gloves do not meet OSHA requirements for bloodborne pathogen or mold exposure
Without HEPA filtration, airborne spore concentration during cleanup can exceed what was present before you started
If treated mold returns within weeks, it signals that the root structure was never addressed — and the total remediation cost increases significantly

The EPA recommends professional remediation for any mold growth exceeding 10 square feet. For reference, that is roughly a 2-by-5-foot section of wall — smaller than most people imagine. For a full discussion of the DIY vs. professional question, read our article on our mold remediation process.

Getting an Accurate Quote: What to Expect

A legitimate mold remediation company should never quote a job sight-unseen over the phone. The right process is an in-person on-site assessment, after which you receive a written estimate before any work begins.

At Post Trauma Scene Decon, every job starts with a thorough assessment. We will:

✓Visit the property and inspect all affected and suspected areas
✓Identify the moisture source (or recommend appropriate specialists if it involves plumbing, roofing, or HVAC)
✓Assess whether porous materials require removal
✓Provide a written estimate itemizing all scope, materials, and disposal
✓Advise on insurance claim eligibility before you commit to anything
✓Answer all your questions — no pressure to proceed until you're ready

We serve all of North Country, NY — including St. Lawrence, Franklin, Essex, Clinton, Lewis, and Jefferson counties. Towns served include Malone, Plattsburgh, Watertown, Massena, Potsdam, Canton, and surrounding areas. We are available 24/7 and respond within 24 hours.

St. Lawrence CountyFranklin CountyEssex CountyClinton CountyLewis CountyJefferson County

How Much Does Mold Remediation Cost Per Square Foot in New York?