Mold Remediation Cost Estimator
Cost data last checked October 5, 2026.
Removing mold from 20 sq ft of drywall or plaster in a bathroom typically costs $500 to $1,570, with these lines included: Material replacement: drywall or plaster (20 sq ft).
Typical cost for this job$500 - $1,570From published national cost guides, checked on the date above the calculator. Sources are listed below it.
1. Where the mold is, and how much
A roughly 3-by-3-foot patch is about 10 sq ft, the EPA's do-it-yourself size guidance.
2. What caused it
What caused the moisture?
- Containment and removal, bathroom (20 sq ft)$200 - $1,500
- Material replacement: drywall or plaster (20 sq ft)$30 - $70
HomeGuide also prices mold removal by size: its small tier (10 - 100 sq ft) runs $500 - $1,500. That does not always line up with the per-square-foot rates ($10 to $25 per sq ft from Angi, $15 to $30 from HomeGuide), so the removal line covers both.
The low end of the total is raised to $500: HomeGuide puts the smallest jobs at a $500 minimum (its Small tier is $500-$1,500).
HomeGuide says the visible surface mold that commonly grows in bathrooms is the easiest type to remove, and that small, localized growth in a bathroom typically costs the least of any location.
Drywall is porous. EPA guidance is that absorbent or porous materials with mold growth may have to be thrown away, so a material-replacement line is added below at HomeGuide's published drywall rate.
Estimate only, based on published national cost guides (see sources below). Local labor rates and what a crew actually finds once containment goes up (mold spreads inside walls more often than it looks from outside) can change the final price. Always get a written, itemized quote.
At 20 sq ft, this is past the EPA's roughly 10-square-foot do-it-yourself guidance. For anything past a small patch, or after a lot of water damage, the EPA points you to its mold remediation guidance for professionals. Containment (keeping spores from spreading to the rest of the house while you work) gets hard to do reliably by hand once the area grows.
3. Have a quote already? Check it
4. National reference by growth size
HomeGuide prices jobs in tiers by how much visible area is affected. For bathroom, basement, attic and behind-wall jobs, the estimate above already covers the tier that matches your area.
| Size | Area | Typical total | Looks like |
|---|---|---|---|
| Small | 10 - 100 sq ft | $500 - $1,500 | A small section of drywall or an isolated spot on a floor or ceiling |
| Medium | 100 - 300 sq ft | $1,500 - $6,000 | A large section of one wall, or a partial attic or basement |
| Large | 300 - 1,000 sq ft | $6,000 - $15,000 | An entire room, attic or basement |
| Very large / whole home | Over 1,000 sq ft | $15,000 - $30,000 | Contamination spread across multiple rooms |
Enter where the mold is, how much visible area it covers, and what it's growing on to see the typical cost of removal and any material replacement, whether the EPA's own size guidance points to doing it yourself, and how a quote you already have compares.
How this is calculated
The estimate starts with a per-square-foot removal rate of $10 to $30 for visible growth. The two national guides disagree here: HomeGuide says $15 to $30 per square foot and Angi says most professionals charge $10 to $25, so the calculator shows the full span. HomeGuide also prices jobs in size tiers (the table in the calculator), and those do not always match the per-square-foot math, so the removal line covers both the rate and the tier for your area. It never goes above $30,000, the most either guide publishes even for whole-house remediation. HomeGuide also notes that some companies charge extra hazardous-waste disposal fees, and that equipment such as air scrubbers may be needed for extensive mold problems, which raises the cost of larger jobs. On top of that, a material-replacement line is added only for porous surfaces: drywall at $1.50 to $3.50 per square foot or insulation at $1.00 to $4.50 per square foot, both HomeGuide figures, because the EPA says porous material that has gone moldy may have to be thrown away rather than cleaned. Non-porous surfaces (tile, glass, metal) get no replacement line at all, since EPA guidance is to scrub them clean with detergent and water instead, and that cleaning is already covered by the removal rate. Wood framing gets no replacement line either: lightly moldy studs are typically sanded, HEPA-vacuumed and treated rather than torn out; framing that is soft or structurally compromised needs an on-site carpenter's quote, since board footage varies too much for a per-square-foot figure to mean anything. If lab testing is selected, air sampling ($100 to $300 per test) and surface sampling ($50 to $200 per test) are added both before removal and again after, for clearance. No total starts below $500, since HomeGuide puts the smallest jobs at a $500 minimum (its Small tier is $500-$1,500). Crawl space and HVAC jobs use the published range for that location at any area, since both guides price those as whole jobs: a crawl space runs $500 to $4,000 (Angi's low end to HomeGuide's high end) and an HVAC system $2,000 to $10,000 (HomeGuide; Angi says $3,000 to $10,000). None of these rates are invented; every one comes from a published cost guide or the EPA, cited below.
Why a local quote can differ from the national range
Every rate above is a national figure, and local labor cost moves the total. Angi's city data shows the size of that swing: mold remediation averages about $2,573 in Los Angeles (most jobs $1,590 to $3,850) and about $1,479 in Kansas City (most jobs $721 to $2,267), against a national average of about $2,370 (Angi, updated Jul 9, 2026). In a high cost-of-living coastal metro, expect quotes toward the upper part of the range this calculator shows, and in lower-cost areas such as much of the Midwest and rural markets, toward the lower part. The calculator does not apply a ZIP-code multiplier; the city figures show the direction and rough size of the difference, not a precise local factor.
Worked example
A homeowner notices mold along the bottom of a bathroom wall after a slow leak behind the toilet. The leak has been fixed. The visible growth covers about 25 square feet of drywall, and they want it tested to confirm what it is before anyone starts cutting into the wall.
| Line item | Typical range |
|---|---|
| Containment and removal, bathroom (25 sq ft) | $250 - $1,500 |
| Material replacement: drywall (25 sq ft) | $38 - $88 |
| Testing before removal: 1 air sample | $100 - $300 |
| Testing before removal: 1 surface sample | $50 - $200 |
| Post-remediation clearance testing: 1 air sample | $100 - $300 |
| Total | $500 - $2,388 |
The removal line runs from $250 (25 sq ft at Angi's $10 per square foot) to $1,500 (the top of HomeGuide's small tier for 10 to 100 sq ft), since the two guides price this size differently. The itemized low end comes to $538, but the total starts at $500, the bottom of HomeGuide's small tier, so a quote HomeGuide calls typical for a job this size is not marked as below range. Because the area is 25 sq ft, past the EPA's roughly 10-square-foot do-it-yourself guidance, the calculator's verdict is "call a pro" rather than "DIY may be reasonable." Skip the three testing line items and the same job comes to $288-$1,588 in itemized removal and material cost. HomeGuide puts the smallest jobs at a $500 minimum (its Small tier is $500-$1,500), so the calculator shows $500-$1,588. A visibly obvious leak-and-mold case like this one often does not need lab confirmation before a remediation crew starts.
What this estimate leaves out
- Your house: the calculator cannot see how far the mold has spread, so hidden growth behind walls or under floors can raise the real job well above the visible area you enter.
- Local prices: every rate is a national figure from the cited guides, and the calculator applies no ZIP-code multiplier.
- Fixing the moisture source, such as a leak, flood damage or poor ventilation: the cause options change the advice shown, not the price.
- Rebuilding beyond the material-replacement line, such as framing that has to be replaced, and any insurance payout.
For a final price, get a written quote from a remediation company after an on-site inspection.
When the EPA says you can do it yourself
The EPA's own guidance gives a specific, checkable size cutoff instead of a feeling: a moldy area smaller than about 10 square feet, roughly a 3-by-3-foot patch, can in most cases be handled without a professional. Above that size, or after a lot of water damage, the EPA points you to its remediation guidance for professionals. For suspected HVAC mold it says to consult its air-duct guide before taking further action, and for sewage or other contaminated water it says to call a professional. This calculator runs your own inputs through that exact cutoff and tells you which side of it you are on, rather than leaving "is this a DIY job?" as a guess.
Location changes the price more than square footage alone
The location tables from HomeGuide and Angi show why. HomeGuide puts a bathroom at $500 to $2,000 and Angi at $500 to $1,000; HomeGuide says the visible surface mold common in bathrooms is the easiest type to remove, and small, localized growth there typically costs the least. Removing mold from an HVAC system costs $2,000 to $10,000 according to HomeGuide ($3,000 to $10,000 according to Angi), depending on the system type and whether the mold has spread into the ductwork. If it has not, HomeGuide's separate figures for air duct cleaning ($200 to $1,000) plus sanitizing ($70 to $150) add up to $270 to $1,150, and Angi puts removing mold from air ducts at $600 to $2,000, so the quote checker treats a quote from $270 to $2,000 as within range on that condition. A crawl space runs $1,500 to $4,000 according to HomeGuide and $500 to $2,000 according to Angi, so the calculator shows $500 to $4,000. To prevent further mold in a crawl space, HomeGuide suggests a dehumidifier or a vapor barrier ($2 to $4 per sq ft installed) afterward; full encapsulation runs $3 to $10 per sq ft.
Before you sign: what to ask a remediation company for
- Their IICRC certification, which you can look up in the IICRC's public Global Locator.
- Whether the quote covers containment and disposal, or only the visible cleanup.
- Whether post-remediation clearance testing is included or billed separately.
- An itemized invoice that separates removal, material replacement, and testing.
- What they found (and fixed) about the moisture source, not just the mold itself. The EPA is direct about this: the key to mold control is moisture control, so a quote that skips the cause is only solving half the problem.
If the quote checker above puts your quote above the typical range, these five items usually show where the difference comes from.
What insurance usually does, and does not, cover
Homeowners insurance usually does not cover mold on its own. HomeGuide notes that it typically does not cover mold remediation unless a natural disaster or a plumbing accident caused the water damage that led to the mold, and that many companies only cover mold removal if you have flood insurance. If a claim is on the table, document the mold and its likely cause with photos before any cleanup starts, and ask your adjuster in writing whether your specific policy carries mold coverage or a mold sub-limit.
If the cause was water damage or a flood
The EPA says that in most cases mold will not grow on materials dried within 24 to 48 hours, so mold after standing water usually means that drying window was missed. This calculator prices the mold cleanup itself; it does not price the water extraction, drying or structural repair that usually comes with it. If that is your situation, thewater damage restoration cost calculatorcovers that side of the job and shows how many hours of standing water it takes before mold becomes a real risk. If the mold is in a crawl space and tied to ongoing ground moisture rather than a one-time event, HomeGuide suggests a dehumidifier or a vapor barrier to prevent further mold (see the location note above).
Questions people ask
How much does mold remediation cost?
HomeGuide puts mold remediation at $15 to $30 per square foot, or $1,500 to $6,000 on average for a typical job; Angi puts most professionals at $10 to $25 per square foot. The full range runs from about $500 for a small, localized patch (10 to 100 sq ft, such as a corner of one wall) up to $15,000 to $30,000 for whole-home contamination spread across multiple rooms (Angi says $10,000 to $30,000). Location changes the number too: HomeGuide puts a bathroom at $500 to $2,000 (Angi: $500 to $1,000), a crawl space at $1,500 to $4,000 (Angi: $500 to $2,000), and an HVAC system at $2,000 to $10,000 (Angi: $3,000 to $10,000), depending on the system type and whether the mold has spread into the ductwork.
When can I remove mold myself instead of hiring a company?
The EPA says a moldy area smaller than about 10 square feet (roughly a 3-by-3-foot patch) can, in most cases, be handled yourself: scrub non-porous surfaces (tile, glass, hard plastic) with detergent and water and dry completely, and know that porous materials such as ceiling tile and carpet may have to be thrown away if they get moldy. The protective gear the EPA lists is an N-95 respirator, goggles without vent holes and long gloves; ventilate the room too. Past that size, or after a lot of water damage, the EPA points you to its remediation guidance for professionals; for suspected HVAC mold it says to consult its air-duct guide first and not run the system; for sewage or other contaminated water it says to call a professional.
What does a mold inspection or testing cost, separate from removal?
HomeGuide prices a full mold inspection at $300 to $650 on average, as little as $200 and up to $1,000 for a large home with widespread growth, covering a visual walkthrough and moisture readings. If you want lab-confirmed results on top of that, air sampling runs $100 to $300 per test and surface sampling (a swab or tape lift) runs $50 to $200 per test. A DIY test kit costs $10 to $100 but is generally less reliable than a professional sample sent to a lab. Testing is optional for a straightforward, visible problem; it becomes worth paying for when you cannot see the mold directly (a musty smell with no visible source) or you need documented proof for a home sale, an insurance claim, or a landlord dispute.
Why does the same square footage cost more in some rooms than others?
It's the surface, not just the room. HomeGuide's repair rates only apply once the mold itself is gone: drywall runs $1.50 to $3.50 per square foot to replace and insulation runs $1.00 to $4.50 per square foot, both because they are porous and the EPA says porous materials that get moldy may have to be thrown away rather than cleaned. A non-porous surface, tile or metal, generally gets scrubbed clean instead, so there is no material-replacement line at all. Two identical-looking mold patches, one on drywall and one on a tile shower wall, can land at very different totals for that reason alone.
Is mold remediation covered by homeowners insurance?
Usually not on its own. HomeGuide notes that homeowners insurance typically does not cover mold remediation unless a natural disaster or a plumbing accident caused the water damage that led to the mold, and that many companies only cover mold removal if you have flood insurance. If you are filing a claim, get the mold documented (photos, and testing if the source is not obvious) before cleanup starts, and ask your adjuster in writing whether your specific policy has any mold coverage or sub-limit.
Is black mold more expensive to remove than other mold?
Not because of the species. The CDC says it is not necessary to determine what type of mold is growing in a home, and that all molds should be treated the same with respect to health risks and removal. The EPA adds that when mold growth is visible, sampling to identify it is, in most cases, unnecessary. So the removal method, and the per-square-foot rate this calculator uses, does not change with the color. Some cost guides still list "black mold" jobs separately: Bob Vila puts them at $800 to $7,000 and attributes the higher cost to protective gear and stronger chemicals for the crew and to growth that spreads into drywall, paper and fiberboard, where it is hard to find. Those are job conditions (how much is growing, and on what), which the area and surface inputs above already capture. If a company adds a surcharge only because the mold looks dark, ask in writing what extra work that charge pays for.
I rent. Who pays for mold removal?
That depends on your lease and on state and local landlord-tenant law, which varies from place to place, so treat this as general information, not legal advice. Federal guidance covers the first steps. The EPA tells renters to report plumbing leaks and moisture problems immediately to the building owner, manager or superintendent, and, if persistent water problems are not addressed, to contact local, state or federal health or housing authorities. If you live in HUD-assisted multifamily housing, HUD's resident rights brochure lists the right to decent, safe and sanitary housing and the right to have repairs performed in a timely manner upon request. Make the report in writing and keep dated photos, so there is a record of when the owner was told. For a definite answer on who pays in your situation, ask your state or local housing authority or a tenant legal aid office.
How long does mold remediation take?
HomeGuide reports 1 to 3 days for small to medium jobs and up to 7 days for large or severe growth, plus longer if drywall, flooring or insulation has to be replaced afterward. You may need to stay elsewhere for a large job; for a single small, contained area, crews can often work while you stay in another part of the house.
What is the difference between mold remediation and mold removal?
They describe the same job. "Remediation" fits better because the goal is not total elimination: the EPA says it is impossible to get rid of all mold and mold spores indoors, and that indoor mold growth is prevented or controlled by controlling moisture. So the work is removing the growth and fixing the moisture that feeds it. HomeGuide suggests hiring a company certified in mold remediation by a group such as the IICRC, which you can check in the IICRC Global Locator.
Where these numbers come from
- US EPA: A Brief Guide to Mold, Moisture and Your Home (10 sq ft DIY threshold; hard vs. porous surface cleanup guidance; checked Sep 28, 2026)
- HomeGuide: Mold Removal Cost (per-sq-ft rate, size tiers, location table, repair rates; checked Sep 28, 2026)
- HomeGuide: Mold Inspection Cost (inspection and air/surface sample testing rates; checked Sep 28, 2026)
- CDC: Facts About Stachybotrys chartarum (no need to identify mold type; all molds treated the same for removal; checked Sep 28, 2026)
- US EPA: Mold Testing or Sampling (sampling usually unnecessary when mold is visible; checked Sep 28, 2026)
- Bob Vila: Mold Remediation Cost (black mold job range and why those jobs are priced higher; checked Sep 28, 2026)
- Angi: Mold Remediation Cost (national average, per-sq-ft rate and location ranges; updated Jul 9, 2026, checked Oct 5, 2026)
- Angi: Mold Remediation Cost in Los Angeles, CA (city average and typical range; checked Sep 28, 2026)
- Angi: Mold Remediation Cost in Kansas City, MO (city average and typical range; checked Sep 28, 2026)
- HUD Office of Multifamily Housing: Resident Rights and Responsibilities (decent, safe and sanitary housing; timely repairs; checked Sep 28, 2026)
- IICRC: Global Locator, for verifying a remediation firm's IICRC certification
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