Mold Remediation Cost (2026)
Mold remediation costs $1,500 to $9,000, with most jobs landing near $3,500. The figure is driven by affected square footage, where in the house it is, and whether porous material — drywall, insulation, subfloor — has to come out. Crawl spaces and basements sit at the lower end; whole-house HVAC contamination sits well above it.
- How much does mold remediation cost?
- Mold remediation costs $1,500 to $9,000 for most jobs, with a national average near $3,500. Small contained areas under 10 square feet run $500 to $1,800. Crawl space remediation is $1,500 to $6,000, and whole-house remediation with full containment reaches $10,000 to $30,000.
- What is mold remediation cost per square foot?
- Remediation runs $15 to $30 per square foot of affected area. The rate is higher for small jobs, because containment setup, equipment and disposal are largely fixed costs that get spread over more area on a bigger job.
- Why is remediation more expensive than cleaning?
- Remediation includes containment barriers and negative air pressure so spores do not migrate through the house during the work, protective equipment, HEPA filtration, removal and regulated disposal of porous materials, and antimicrobial treatment of what remains. Cleaning is none of that, which is why it is a third of the price and inappropriate for anything beyond a small surface patch.
- Do I need remediation or just a cleanout?
- Under 10 square feet on a hard, non-porous surface is generally a cleaning job. Anything larger, anything on drywall, insulation or subfloor, and anything where the source of moisture is still active is remediation. The distinction is about containment and material removal, not about how visible the growth is.
- Does the price include fixing the leak?
- Almost never. Remediation quotes cover removal and treatment; the plumbing repair, roof repair or drainage work that stopped the water is separate, and so is rebuilding whatever was torn out. Budget for all three or the remediation will need doing again.
| What you're pricing | Low | Typical | High |
|---|---|---|---|
| Small contained areaUnder 10 sq ft, single surface | $500 | $1,000 | $1,800 |
| Crawl space remediationTypical 1,500 sq ft crawl space | $1,500 | $3,500 | $6,000 |
| Basement remediationIncludes affected drywall removal | $2,000 | $4,500 | $8,000 |
| Bathroom remediationBehind tile or under flooring | $800 | $2,200 | $4,500 |
| Attic remediationSheathing treatment, often ventilation work too | $1,500 | $3,500 | $7,000 |
| HVAC / ductwork remediationCleaning and sealing the distribution system | $2,000 | $4,000 | $8,000 |
| Whole-house remediationMultiple rooms, full containment | $10,000 | $18,000 | $30,000 |
What drives the price
- Affected square footage
- The primary variable, at $15 to $30 per square foot. Ask for the measured area on the quote rather than a description like "significant growth".
- Porous or non-porous
- Mold on a concrete wall is treated in place. Mold in drywall, insulation, carpet or subfloor means that material is removed and replaced, which is both remediation cost and reconstruction cost.
- Containment requirements
- Sealed barriers, negative air machines and HEPA filtration are what separate a remediation from a cleaning, and they carry a largely fixed cost of $500 to $1,500 regardless of area.
- Access
- Crawl spaces, attics and wall cavities all add labour. A crawl space job is done lying down; an in-wall job means opening and closing the wall.
- Whether the HVAC is involved
- Contamination in ductwork means the system distributed spores through the house, which widens the scope from one room to the whole building.
What a remediation quote should itemise
Measured affected area in square feet. Containment method. Which materials are being removed versus treated in place. Whether HEPA air scrubbing is included and for how long. Disposal. And post-remediation verification — an independent clearance test — which is the only evidence that the work succeeded.
A quote that gives a total and a paragraph of description is not comparable to anything. Two remediation quotes on the same house frequently differ by a factor of two, and almost always because they are scoping different amounts of material removal rather than because one company is expensive.
Where the moisture came from decides the real budget
Remediation removes what has grown. It does nothing about the condition that let it grow. In a crawl space that is usually ground moisture or drainage, which means encapsulation at $3,000 to $8,000 or an interior drain at $3,000 to $8,000 on top of the remediation figure.
This is why the honest total for a mold problem is usually two to three times the remediation quote alone. A contractor who quotes remediation without asking where the water came from has priced a symptom.
Common questions
- How much does mold remediation cost?
- Mold remediation costs $1,500 to $9,000 for most jobs, with a national average near $3,500. Small contained areas under 10 square feet run $500 to $1,800. Crawl space remediation is $1,500 to $6,000, and whole-house remediation with full containment reaches $10,000 to $30,000.
- What is mold remediation cost per square foot?
- Remediation runs $15 to $30 per square foot of affected area. The rate is higher for small jobs, because containment setup, equipment and disposal are largely fixed costs that get spread over more area on a bigger job.
- Why is remediation more expensive than cleaning?
- Remediation includes containment barriers and negative air pressure so spores do not migrate through the house during the work, protective equipment, HEPA filtration, removal and regulated disposal of porous materials, and antimicrobial treatment of what remains. Cleaning is none of that, which is why it is a third of the price and inappropriate for anything beyond a small surface patch.
- Do I need remediation or just a cleanout?
- Under 10 square feet on a hard, non-porous surface is generally a cleaning job. Anything larger, anything on drywall, insulation or subfloor, and anything where the source of moisture is still active is remediation. The distinction is about containment and material removal, not about how visible the growth is.
- Does the price include fixing the leak?
- Almost never. Remediation quotes cover removal and treatment; the plumbing repair, roof repair or drainage work that stopped the water is separate, and so is rebuilding whatever was torn out. Budget for all three or the remediation will need doing again.
How we price this. Figures are national 2026 estimates built from contractor quote ranges, material pricing and regional labour rates, then cross-checked against published industry cost data. Reckon Home does not sell, broker or perform this work. Use these numbers to judge whether a quote is reasonable — not as a quote.