Last updated October 10, 2026
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The short answer
Angi reports Boston-market mold remediation averages about $2,454. Most jobs fall between about $1,381 and $3,563 (2026 data). That is a Boston figure, not a quote for a Dunstable home. A small patch can cost far less. A leak that spread through walls or a finished basement can cost far more.
Published prices by location
| Where | Range | Guide |
|---|---|---|
| Attic | $3,000 – $6,000 | Attic mold removal |
| Basement | $2,500 – $5,000 | Basement mold removal |
| Crawl space | $500 – $2,000 | Crawl space mold removal |
| Wall | $1,000 – $20,000 | Black mold removal |
| HVAC system | $2,000 – $6,000 | n/a |
| Bathroom | $500 – $1,000 | n/a |
Testing costs
Clever Real Estate analyzed 343,231 quotes: the average mold inspection is about $687 nationally ($165 to $2,967) and about $725 in Massachusetts. Lab fees run about $50 to $350 per sample. You often do not need a test. See mold testing.
What moves the price
- Size. The EPA's 10 sq ft line separates DIY from pro work.
- Materials. Mold on framing is cleaned. Mold in drywall, insulation or carpet is replaced.
- Access. Crawl spaces, tight attics and finished walls cost more.
- Containment. Sealing and HEPA air scrubbers add equipment and time.
- The moisture source. Fixing the leak is a separate cost.
- Rebuilding. New drywall, paint and flooring are usually separate.
- Time. Mold caught inside 24 to 48 hours reaches less material.
Check what a quote includes
- Removal and disposal of affected materials.
- Containment and air filtration.
- Drying until readings are normal.
- How the result is verified.
- Rebuilding. Included or not?
- Fixing the source. Plumbing, roofing, drainage, ventilation.
Warning signs
- A firm price by phone with nobody having seen the house.
- Spraying or fogging as the whole job.
- No containment plan beyond a small patch.
- No plan for the moisture source.
- Pressure to sign or pay a big deposit up front.
- No written scope.
Massachusetts DPH suggests references, a written scope, installment payments and holding back the final payment. No license is required to remove mold in Massachusetts. You can check registration on Mass.gov.
Insurance
Many policies cover mold from a sudden event like a burst pipe, and exclude slow seepage. Read your policy and ask your agent first. See does homeowners insurance cover mold. After a leak, see mold removal after water damage.
Want to talk through your situation?
Call and describe what you found.
Nearby towns
Prices differ by building. See Lowell, Westford, Chelmsford, Tyngsborough and Groton. The mold removal in Dunstable homepage covers the whole process.
Frequently asked questions
How much per square foot?
Per-foot figures vary too much to rely on. Containment, access and rebuilding dominate. Use the location table above and get a written scope.
Why do quotes differ so much?
They often cover different things. Compare what each includes: containment, drying, verification, rebuilding.
Should I pick the lowest quote?
Not automatically. The highest is not automatically better either. Compare what is included.
Does the price include rebuilding?
Often not. Drywall, insulation, paint and flooring are frequently separate. Ask who will do it.
Do I need to pay for testing too?
Usually not. The EPA says sampling is usually unnecessary if mold is visible.
