November 2, 2026
A material is asbestos-containing material (ACM) if it contains more than 1% asbestos. Asbestos was used for decades in floor tile, mastic, drywall and joint compound, insulation, "transite" pipe and panels, stucco, roofing, and more.
There is no safe exemption based on the age of a building — asbestos has turned up in structures of many eras, and it is only dangerous when disturbed and made airborne.
Several authorities apply, often to the same project:
Cal/OSHA Asbestos in Construction (8 CCR §1529): worker protection and work practices. The permissible exposure limit is 0.1 fiber per cubic centimeter (8-hour average), with a short-term excursion limit of 1.0 f/cc over 30 minutes.
Cal/OSHA DOSH Asbestos Contractors' Registration Unit (ACRU): any contractor or employer engaged in asbestos-related work involving 100 square feet or more of ACM must be registered with Cal/OSHA.
CSLB (Contractors State License Board): asbestos abatement requires the C-22 Asbestos Abatement classification. CSLB will not issue a C-22 unless the contractor is registered with Cal/OSHA DOSH (or has an application in process).
Certified Asbestos Consultant (CAC) / Certified Site Surveillance Technician (CSST): surveys, assessments, and oversight on projects involving 100 square feet or more must be done by consultants certified by Cal/OSHA DOSH.
Your regional Air Quality Management District: in Southern California, South Coast AQMD Rule 1403 governs asbestos emissions from demolition and renovation, requiring a survey and advance notification.
Federal: the EPA Asbestos NESHAP (40 CFR 61, Subpart M) and, for schools, AHERA (40 CFR 763).
Before demolition or renovation that may disturb asbestos, a survey by a certified consultant identifies and quantifies ACM. In the South Coast AQMD region, Rule 1403 requires a survey before any demolition (no exceptions) and before renovations that disturb ACM at or above the district threshold (generally 100 square feet / 100 linear feet).
All demolitions require notification to the air district — even if no asbestos is found and even if a city demolition permit is already in hand. Damaged or disturbed asbestos must be handled under a district-approved cleanup plan regardless of size.
The air district requires a notification, not an asbestos permit. Separately, your city or county issues the demolition or building permit for the underlying construction, and building departments often tie that permit to having the asbestos paperwork in place.
Cal/OSHA registration and CSLB licensing are credentials, not project permits. In short: certification plus notification plus the local construction permit — three separate lanes that all have to be satisfied.
Surveys/assessments (100 sq ft or more): a Cal/OSHA-certified CAC or CSST.
Abatement over 100 sq ft: a contractor registered with Cal/OSHA DOSH and holding the CSLB C-22 Asbestos Abatement classification, using trained and certified supervisors and workers.
Smaller jobs under 100 sq ft still carry full asbestos work-practice and worker-protection requirements under Cal/OSHA, even though DOSH registration is triggered at 100 square feet.
Do: assume suspect materials in an older home contain asbestos until tested; hire a certified consultant to survey before any renovation or demolition; use a Cal/OSHA-registered, C-22-licensed abatement contractor for removal; keep everyone out of the work area until it's cleared; contact us for a CERTIFIED CONSULTANT REFERRAL LIST — we do not perform testing ourselves, but we can recommend certified consultants.
Don't: sand, cut, scrape, or demolish suspect materials yourself; sweep or vacuum debris with a household vacuum; assume a newer building is asbestos-free; skip the survey because you "don't think" there's asbestos — the survey is how you find out.
Do: register with Cal/OSHA DOSH and hold the C-22 classification for abatement over 100 square feet; get a certified survey before you disturb anything, and submit the required air-district notification 10 working days (14 calendar days) ahead; follow 8 CCR §1529 for exposure monitoring, containment, wetting, HEPA, PPE, and decontamination; keep ACM wet, bagged in leak-tight containers, and tracked with waste shipment records; keep records (surveys, notifications, approvals, waste records, training) at least three years; contact us for a CERTIFIED CONSULTANT REFERRAL LIST — we do not perform testing ourselves, but we can recommend certified consultants.
Don't: perform asbestos work over 100 square feet without Cal/OSHA registration and the C-22; start before the notification waiting period has run; dry-cut, grind, or use compressed air on ACM; mix up the air-district notification with the city permit — you need both.
Do: survey before any renovation, repair, or demolition that disturbs building materials in older buildings; use only registered, certified contractors and keep their credentials on file; keep survey and notification records available on-site during projects; respond immediately to any damaged or disturbed asbestos by securing the area and calling a certified consultant; contact us for a CERTIFIED CONSULTANT REFERRAL LIST — we do not perform testing ourselves, but we can recommend certified consultants.
Don't: let maintenance staff disturb suspect materials (floor tile, popcorn ceilings, pipe insulation) without a survey; assume a prior "asbestos-free" letter covers new work; ignore the air-district notification requirement for demolitions.
What makes a material "asbestos-containing"? More than 1% asbestos.
Does building age exempt me? No — the requirement is based on the work and the materials disturbed, not the year built.
Who can legally remove asbestos in California? For jobs of 100 square feet or more, a contractor registered with Cal/OSHA DOSH holding the CSLB C-22 classification; surveys require a certified CAC or CSST.
Do I need a permit? The air district requires a notification, not a permit; the city/county issues the demolition or building permit separately.
What are the risks of doing it wrong? Airborne asbestos exposure causes asbestosis, lung cancer, and mesothelioma, and violations carry significant penalties and stop-work exposure.
All Clear Environmental is a licensed asbestos abatement contractor serving Los Angeles County (CSLB #824771, DOSH #897). We do not perform testing or surveys. The survey is the client's responsibility: you contact and pay the certified consultant, then provide us the testing report and survey so we know exactly what materials are identified.
Once the materials are identified, we handle the air-district notification and perform the removal under the procedures the law requires — so your renovation or demolition stays safe, compliant, and on schedule. If you need a consultant, contact us for a CERTIFIED CONSULTANT REFERRAL LIST.
Book a free job walk at https://allclearenvironmental.com/free-estimate or call 818-762-2030. This article is informational and not legal advice.
