Mold remediation cost per square foot
| Job | Installed price | Good to know |
|---|---|---|
| Remediation per square foot of affected area | $10–$30 | The affected surface, not the size of the room |
Remediation is priced by the area of mold, not by the size of the house. Angi, HomeGuide and Fixr all quote about $10 to $30 per square foot. Forbes Home also mentions a lower estimate of $2.50 per square foot for cleaning surface mold with HEPA vacuuming and an antimicrobial wash, which is far below every other guide and does not cover removing damaged materials, so it is not used here.
Cost by room
| Location | Typical total |
|---|---|
| Bathroom | $500-$1,000 |
| Basement | $500-$3,000 |
| Crawl space | $500-$2,000 |
| Attic | $1,000-$4,000 |
| HVAC systems | $3,000-$10,000 |
| Whole house | $10,000-$30,000 |
Cost by affected area
| Affected area | Total |
|---|---|
| 25 sq ft | $250–$750 |
| 50 sq ft | $500–$1,500 |
| 100 sq ft | $1,000–$3,000 |
| 200 sq ft | $2,000–$6,000 |
| 500 sq ft | $5,000–$15,000 |
| 1,000 sq ft | $10,000–$30,000 |
What changes the price
- Size of the area. The price is mostly per square foot of mold, and a small job hits the company's minimum.
- Where it is. Mold behind walls, in ductwork or in a crawl space takes more work than mold on an open surface.
- The source of moisture. The leak that caused the mold has to be fixed first, or it comes back. That repair is not part of the remediation price.
- Materials that must be removed. Drywall, insulation and carpet that are soaked are cut out and replaced, which is billed separately.
- Testing. Inspection before and clearance testing after add to the bill.
- Where you live. The calculator adjusts the labor share for your state's wages for hazardous materials workers.
Extras to expect
| Item | Typical cost | When it applies |
|---|---|---|
| Mold inspection and testing | $250–$800 | Before and after the work |
| Replace cut-out drywall | $1.50-$3.50 per sq ft | See drywall repair cost |
| Repaint the repaired walls | $1-$3 per sq ft | See interior painting cost |
Questions to ask before you hire
- Does the quote include containment, air filtration and a clearance test?
- Who finds and fixes the moisture source?
- What is removed and what is cleaned, and who replaces what is removed?
- Is there a minimum charge, and is the price by the square foot or a flat fee?
- Is testing done by someone independent from the company doing the removal?
Methodology and sources
We price the work per square foot from three published guides, take the middle of their lows, midpoints and highs, and adjust the labor share for your state's wages. This Old House and Bob Vila repeat Angi's numbers, so they are not counted twice. Read how we estimate costs.
- Angi: mold remediation cost — price per square foot, cost by area, testing
- HomeGuide: mold removal cost — price per square foot, inspection, black mold, repairs
- Fixr: mold remediation cost — price per square foot, inspection
- Bob Vila: mold remediation cost — labor share
- Forbes Home: mold remediation and removal costs — used as an independent cross-check
- BLS OEWS May 2025, State (SOC 47-4041, Hazardous Materials Removal Workers) — state labor index
What each source reports
Our estimate does not rely on any single page. This table lists each page we used and the figures it reports, so you can see where the ranges come from.
| Source | What it reports |
|---|---|
| Angi |
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| HomeGuide |
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| Fixr |
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| Bob Vila | about 60 percent of mold removal cost is labor (updated Apr 2024) |
Common questions about mold remediation costs
How much does mold remediation cost?
A typical job (100 sq ft) comes to about $2,000 nationally, within a range of $1,000 to $3,000. Use the calculator above to adjust for your state, the options you choose and any extras.
How much does mold remediation cost per square foot?
About $10–$30 per square foot of affected area, labor and materials included. A 100 sq ft area is $1,000–$3,000.
How much does it cost to remove a small patch of mold?
A 25 sq ft area costs about $250–$750 by the square foot, but most companies set a minimum charge of around $500, so a single corner is often billed at the minimum.
How much does it cost to remove mold from a bathroom, basement or attic?
Angi lists the bathroom at $500 to $1,000, a basement at $500 to $3,000, an attic at $1,000 to $4,000 and a crawl space at $500 to $2,000. Mold that has spread behind tile or a vanity costs far more because the wall has to come open.
How much does whole-house mold remediation cost?
Angi puts a whole house at $10,000 to $30,000. A 1,000 sq ft area costs $10,000–$30,000 by the square foot.
How much does a mold inspection or test cost?
Inspection and testing cost about $250–$800, before and after the work. The three guides we read differ: Angi gives $250 to $350 and also $450 to $800 on the same page, HomeGuide $300 to $650, and Fixr $450 to $800.
How much does black mold removal cost?
HomeGuide puts black mold removal at $2,000 to $10,000 on average. The price follows the size of the affected area, so use the square-foot figure for your job as a starting point.
Does the price include repairs?
Usually not. Replacing drywall that was cut out costs $1.50 to $3.50 per square foot and repainting $1 to $3 per square foot on top, according to HomeGuide. See the drywall repair cost page.
How much of the cost is labor?
About 60%, according to Bob Vila, which is why the price changes with your state's wages.
Where do these prices come from?
They come from 4 published cost pages from 4 publishers, last checked Oct 8, 2026. We report what those pages say and do not invent figures; the table above shows each source.
How does my state change the estimate?
The labor part of the price is scaled by the average wage for the relevant trade in your state, using Bureau of Labor Statistics data. Materials and equipment are not adjusted.
Why might a contractor's quote differ from this estimate?
A quote reflects your specific scope, access, local demand and what the contractor includes. Ask for line items rather than a single total so you can compare bids on the same basis.
All 4 sources behind these prices
Every figure in the calculator comes from one or more of these pages, with the number each one supports in the link text.