Methodology
Last updated November 9, 2026
Every number on this site is either sourced or labelled as an estimate. This page explains the difference, and how a claim gets from a source document to a published page.
1. Primary sources first
Regulatory claims come from the primary text: EPA NESHAP (40 CFR Part 61, Subpart M) for renovation and demolition, and the OSHA asbestos standards (29 CFR 1926.1101 for construction, 29 CFR 1910.1001 for general industry). State notification periods, licensing categories and fees come from the state asbestos program page, named and linked. Laboratory accreditation is checked against the NVLAP directory rather than a lab's own marketing.
2. Cost models show their inputs
Installed cost is modelled from visible inputs: the material or equipment price, the labour and access scope (excavation, drain, electrical, permit), consumables, and a reserve for service or repair. We do not present a single "average cost" as if it were a quote; the range and what it includes are stated on the page.
3. How options are compared
We compare methods on what they physically do to the material, how long the result is expected to last, what testing closes the job, and what the disposal and notification paperwork requires. A method earns a recommendation for a stated material and condition; no contractor can buy a place in a comparison.
4. What we have not tested
We do not run a laboratory or a crew, and we do not carry out every job we write about. When a claim comes from a manufacturer document, an adopted code, a certification listing or a contractor report, we say which. We do not imply first-hand testing we did not perform.
5. Sources we work from
| Source type | What it decides | How it is cited |
|---|---|---|
| EPA NESHAP, 40 CFR Part 61 Subpart M | Which renovations are regulated and how waste must be handled | Section cited |
| OSHA 29 CFR 1926.1101 / 1910.1001 | Worker protection, exposure limits, competent-person duties | Standard cited |
| State asbestos program pages | Licensing, notification periods and fees | Agency named, with its link |
| NVLAP accreditation directory | Whether a laboratory's bulk-sample result is accredited | Lab and accreditation named |
| Published US price guides | Abatement cost bands | Band with the month it was checked |
When two sources disagree, the page says which one it followed and why. A figure that cannot be traced to a document is labelled an estimate, and an estimate is never presented as the price of a specific job.
6. Listings and directory data
The service-area directory is compiled from public business records: the firm's own website, its published address and phone number, and the state asbestos-program licence register named on the city page. A record is marked verified only when the name, address, phone and licence have been checked against those sources and the date of the check recorded; everything else is labelled. A licence number is a starting point, not proof that a firm carries current liability insurance or the right category for your job.
7. Corrections
If a code, a specification or a listing changes, we update the article and its "last updated" date. Emailcontact@asbestosremovallab.com with the page and the correction.