Mold fungus and mildew image

For many homeowners, the big question is: What is the cost of mold remediation? 

The average cost for a 100 square foot room can range from $1,500 to $3,200 ($15 to $32 per square foot).

A small-scale mold remediation cost can range from $500 to $1,000, whereas large-scale jobs could cost a staggering $3,500 to $6,000. 

However, the truth is that many homeowners with less than 10 square feet of mold contamination can perform DIY mold remediation with about $50 to $100.

Whether you’re hiring professionals or buying DIY kits to remediate mold, the final cost often depends on the severity of the contamination.

It’s safe to say that many homeowners across North America have spent thousands of dollars dealing with mold problems. 

Early detection and treatment drives down cost

Early detection and treatment can significantly lower the cost of mold remediation. Note that if mold is left untreated for a long while, it does more damage to lumber, drywall, siding, subflooring, and spreading other parts of your home.

Breaking down the cost of hiring a professional

Mold remediation professionals may charge an hourly rate of $75 to $110. Hourly rates are oven dependent on the local prices. If you are hiring a professional for the job, mold remediation cost may involve:

  1. Testing cost—to identify the type and location of the mold. This cost is subject to the professional’s quote. 
  2. Containment cost—containing the contaminated area (with polythene sheeting) to enable remediation may cost $0.3 – $0.5 per cubic foot.
  3. Removal cost—
  • Antifungal cleaning: Cost of cleaning or spraying affected area:  $1 – $10 per square feet.
  • Abrading: the area is sanded, brushed, or scraped to remove mold spores: $0.90 – $1.20 per square feet.
  • Dry ice blasting with High-Efficiency Particulate Air (HEPA) vacuum to remove spires:  $0.70 – $0.90 per square feet.
  • Encapsulation: sealing mold residue and stopping future growth. $5 – $80 per square foot
  • 4. Remediation cost in the attic—depending on the severity of the mold problem in the attic, the cost could range from $1,500 to $10,000. Apart from mold remediation cost, you may have to hire a carpenter to replace damaged attic beams, joists, and insulation. Added is also the cost of fixing a leaky roof or damaged plumbing.
  • 5. Remediation cost in the basement—depending on the damage level, basement remediation cost may range from $500 to $5,000. This covers the cost of replacing drywall, wall insulation, wall joists, flooring, fixing leaks, sealing foundation, and installing dehumidifiers.

Before hiring a professional

According to the U.S. Environmental Protection Agency, it is recommended you hire an experienced professional for serious mold problems. 

Remediating mold is dangerous work, so hiring experienced professionals is vital. This means finding EPA-certified mold remediating professionals and checking their reviews and references. The profession must follow the EPA guideline for remediating mold in commercial buildings and schools. 

DIY costs

If you’re looking to take the DIY route, here are cost projections for mold remediation: 

  1. DIY cleaning cost: This involves hand-cleaning surface mold with a cleaning solution and touching-up of drywall surfaces. This also consists of treating flooring, walls, and ceiling.
  • Ceiling and walls:  washing, rinsing, and drying of drywall and ceiling surfaces with a cleaning solution—$0.35 per square feet
  • Flooring: hand washing, rinsing, and drying carpet with a cleaning solution—$0.35 per square feet
  • Paint touch-up:  brushing with waterproof paint—$0.12 per square feet

    2. DIY Removal cost: This is the cost of removing and disposing of all contaminated surfaces of walls and ceiling. This includes cleaning flooring, replacing drywall surfaces, and painting.

  • Removing walls and ceiling: removing contaminated wall and ceiling material and disposal—$0.25 per square feet
  • Replacing walls and ceiling: installing waterproof drywall—$1.03 per square feet
  • Painting: Paint with latex antimicrobial paint, primer coat, and finish coat—$0.20 per square feet
  • Cleaning floor: hand-washing, rinsing, and drying all surfaces using a cleaning solution—$0.35 per square feet
  • Disposal: transporting and dump fees—$45 per cubic yard

Note for DIY remediation: 

  • We make no claims with the costs in these articles, as variations occur from place to place. 
  • These costs don’t make room for special measures like disposal, ventilation, or hazard containment. These additional factors may raise the price.
  • Visual inspection can decide remediation terms, and air testing is not usually necessary.
  • Permit fees and taxes are not included.
  • DIY mold remediation requires no professional license, but you need to protect yourself during the cleaning process. 
  • Installing drywalls or fixing ceilings would often require expert knowledge. 

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