Mold remediation costs $1,223 to $3,757 for most projects, a $2,368 national average per Angi – priced at $10 to $30 per square foot of affected area across the three major references.1,2,3 Location swings the total more than size: a bathroom runs $500 to $1,000 while an HVAC system hits $3,000 to $10,000.1*
$2,368
national average, Angi
$1,223 – $3,757
typical project, Angi
$10 – $30
per sq ft across sources
$10,000 – $30,000
whole house, Angi
Quick math: mold is priced per affected square foot, not per room. A 100 sq ft patch costs $1,000 to $2,500 at Angi’s $10 to $25 rate and $1,500 to $3,000 at HomeGuide’s $15 to $30 (our math) – Fixr’s table independently lands at $1,000 to $3,000. Budget testing on top: $250 to $350 per Angi.
Published prices at a glance
Three references, all fetched and read October 2026:
| Measure | Angi1 | HomeGuide2 | Fixr3 |
|---|---|---|---|
| Typical project | $1,223 – $3,757 (avg $2,368) | $1,500 – $6,000 | $1,500 – $9,000 (avg $3,500) |
| Per sq ft | $10 – $25 | $15 – $30 | $10 – $30 |
| Bathroom | $500 – $1,000 | $500 – $2,000 | $500 (low end) |
| Crawl space | $500 – $2,000 | $1,500 – $4,000 | – |
| Basement | $500 – $3,000 | $1,500 – $6,000 (full to $15,000) | – |
| Attic | $1,000 – $4,000 | $1,500 – $6,000 (full to $15,000) | $3,500 (average basis) |
| Walls | $1,000 – $20,000 | – | – |
| HVAC system | $3,000 – $10,000 | $2,000 – $10,000 | – |
| Whole house | $10,000 – $30,000 | $15,000 – $30,000 | $30,000 (high end) |
| Testing / inspection | $250 – $350 | – | – |
Where they disagree: per-square-foot rates cluster tightly ($10 to $30), but location tables do not – an attic is $1,000 to $4,000 at Angi versus $1,500 to $6,000 partial at HomeGuide, and a crawl space doubles from $500 to $2,000 to $1,500 to $4,000. One caution inside a single source: Angi quotes testing at $250 to $350 in one section and $450 to $800 in another, so treat testing as a few hundred dollars and ask for the fee up front. Whole-house work is the one true consensus: $10,000 to $30,000+ everywhere.1,2,3
What pushes the price up
Location: accessible surface mold in a bathroom is the cheapest job; mold inside walls ($1,000 to $20,000) or HVAC systems ($3,000 to $10,000) needs demolition or specialized cleaning per Angi.1
Affected area: pricing follows the contaminated square footage – $10 to $30 per sq ft – so catching growth early is the single biggest cost lever.1,2,3
Mold type: black mold requires extra protective equipment and commands higher rates, per Angi.1
The moisture source: remediation without fixing the cause means repeat growth – roof repair ($350 to $1,250) or foundation sealing ($2,250 to $7,100) often belongs in the same budget per Angi.1
Three worked examples (we did the math)
| Project | Cost basis | Total |
|---|---|---|
| 100 sq ft patch, three rates | Angi $10 – $25, HomeGuide $15 – $30, Fixr $10 – $30 – our math | $1,000 – $3,000 (matches Fixr table) |
| Testing plus typical remediation | $250 – $350 + $1,223 – $3,757 (Angi) – our math | $1,473 – $4,107 all-in |
| Bathroom vs HVAC system | published ranges (Angi) – our comparison | same mold, up to 10x the price by location |
These are example projects, not quotes – location, affected area, mold type and the moisture source set the real number.
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Drywall Repair Cost
FAQ
How much does mold remediation cost? $1,223 to $3,757 for most projects ($2,368 average) per Angi, priced at $10 to $30 per affected square foot across all three sources.1,2,3
Can I remove mold myself? Angi says small patches can be DIY only if you are certain it is not toxic – for almost every discovery, a professional is the recommended course.1
Does location really matter that much? Yes – the same contamination costs $500 to $1,000 in a bathroom and $3,000 to $10,000 inside an HVAC system per Angi, because access and specialized cleaning drive labor.1
Do I need mold testing first? Testing runs $250 to $350 per Angi and identifies the type and extent; visible mold on an obvious moisture problem can sometimes skip straight to remediation quotes.1
Sources
- Angi – How Much Does Mold Remediation Cost
- HomeGuide – How Much Does Mold Removal and Remediation Cost
- Fixr – Mold Remediation Cost
*Prices are 2025-2026 national averages from the cited sources and vary by location, affected area, mold type and region. Get at least three itemized quotes.