6 min read · Cost
Some California homes built before 1980 still wear asbestos-cement siding — a durable, fire-resistant cladding that was popular for decades and is entirely different from modern non-asbestos fiber cement like Hardie. Replacing it is not an ordinary re-side: it carries specific testing, legal, and safety obligations that have to be handled before any new cladding goes up. This guide explains how to identify it, what California law requires, and how the abatement and re-side fit together.
Why pre-1980 California homes carry it
Asbestos-cement siding was installed widely from roughly the 1940s through the 1970s because it was cheap, tough, and naturally fire-resistant — genuinely attractive qualities at the time. New asbestos products were banned for this use in 1989, but the existing installations didn't go anywhere; they remain on a meaningful slice of older California housing stock. You'll most often find it on original cladding from that construction era, frequently with a distinctive cement-shingle pattern. It's worth being clear that this is a fundamentally different material from the fiber cement we install today: modern boards contain no asbestos. The presence of the old product is a hazard-management question, not a reflection on the performance of contemporary cement-based siding.
Identifying it — and why you must test
Visual clues point you toward asbestos but never confirm it. The flags are a cement-board shingle pattern, sometimes with a distinctive corrugation or manufacturer markings, on original cladding of a pre-1980 home. None of that is definitive. The only reliable identification comes from a sample collected by a licensed asbestos consultant and analyzed in a laboratory. The reason testing matters so much is that the entire legal and safety pathway downstream depends on the answer — abatement rules, disposal, and even insurance treatment all hinge on confirmed content. Don't assume one way or the other based on appearance, and don't break or sand a suspect board to 'check,' because disturbing it is exactly what releases fibers. Test first; decide second.
What California law requires for removal
California regulates asbestos removal tightly, and the requirements depend on whether the material is friable. Asbestos siding is typically non-friable when intact, but removal still generally triggers notification to your local air district, contained removal procedures, sealed handling, and disposal at a licensed facility. Friable or damaged material raises the bar further and requires a licensed asbestos abatement contractor. The throughline is that this work is licensed, regulated, and documented — it is not a homeowner DIY project. Before you hire anyone for the abatement or the subsequent re-side, verify their licensing through the CSLB; abatement specialists carry specific certifications beyond a standard contractor's license, and confirming credentials up front protects both your household and your liability.
How the project actually sequences
A combined abatement-and-re-side runs in a fixed order. First, testing confirms asbestos content. Second, a licensed abatement contractor builds an abatement plan and files the required notification with the local air district. Third, the crew sets up containment and removes the old cladding under controlled conditions, with sealed disposal at a licensed facility. Fourth — and this is the step homeowners forget — the exposed substrate gets inspected, because asbestos siding sometimes covered sound wood and sometimes covered framing that needs repair. Only then does the standard re-side begin, typically with modern fiber cement siding. The two phases are genuinely separate trades; abatement finishes and is cleared before new cladding work starts, which is why timeline planning matters as much as scope.
Insurance, disposal, and who pays
Homeowners are usually surprised that insurance offers little help here. California homeowners policies typically exclude asbestos abatement, treating it as a pollution issue or a pre-existing condition, so the cost generally lands on the owner rather than a carrier. Disposal is part of the abatement scope and must go to a licensed facility — there's no legitimate shortcut, and using an unlicensed disposal route creates liability that dwarfs any savings. In a sale context, abatement is sometimes negotiated into the transaction between buyer and seller, but absent that it's simply a project cost to plan for. Because the financials don't get rescued by insurance, the honest move is to budget for the full combined scope from the outset rather than hoping a policy absorbs part of it.
Why DIY removal is the wrong call
Beyond the legal problem, DIY asbestos removal is a real health gamble. Cutting, snapping, or sanding asbestos-cement releases airborne fibers, and meaningful exposure is linked to mesothelioma and lung cancer — these are not theoretical risks. Without professional containment, those fibers spread through the home and contaminate the work area. Add the liability of improper disposal and the picture is clear: the money saved by skipping licensed abatement is trivial against what's at stake. Intact, undisturbed asbestos siding that you're simply leaving in place is generally low-risk, which is part of why the decision to remove should be deliberate. But once you've decided to remove it, that work belongs to licensed professionals, full stop.
Where Sierra Siding fits
We are direct about our lane: we don't perform asbestos abatement, because it requires specialized licensing we don't hold. What we do is coordinate the overall project. We work with licensed abatement contractors so the removal happens first and is cleared, then we handle the substrate assessment and the new cladding install once the wall is safe to work on. For most of these homes that means a clean switch to modern James Hardie fiber cement and a properly detailed weather-resistant exterior. We'll help you sequence the trades, set a realistic timeline, and keep the scope transparent. We scope on site, your written estimate governs, and our what to expect during a siding replacement guide walks the re-side half of the project.
Asbestos siding replacement scope and cost
| Step | Cost |
|---|---|
| Asbestos testing | $500-$1,500 |
| Abatement (typical home) | $5,000-$20,000 |
| Standard re-side after abatement | $25,000-$70,000+ |
| Total project (typical home) | $30,000-$90,000+ |
Key takeaways
- Asbestos-cement siding shows up on some pre-1980 California homes and is unrelated to modern asbestos-free fiber cement
- Visual clues suggest it; only a lab-analyzed sample from a licensed consultant confirms it
- Removal is licensed and regulated — air-district notification, containment, sealed disposal at a licensed facility
- Intact, undisturbed asbestos siding is generally low-risk; the hazard comes from disturbing it
- Insurance typically excludes abatement, so plan to fund the combined abatement-and-re-side yourself
- Sierra Siding coordinates with licensed abatement contractors, then handles substrate work and the new install
FAQ
Quick Answers
Often, yes. Undamaged, undisturbed asbestos-cement siding is generally low-risk to leave in place. The hazard arises when it's broken, sanded, or removed, which is why replacement requires proper abatement.
No. Abatement requires specialized licensing we don't hold. We coordinate with licensed asbestos abatement contractors who remove and dispose of the old cladding, then we handle the substrate assessment and re-side.
Have a licensed asbestos consultant collect a sample for laboratory analysis. Appearance and construction era are suggestive but never definitive, and you shouldn't disturb a suspect board to inspect it yourself.
Usually not. California policies commonly exclude asbestos work as a pollution or pre-existing-condition matter, so the cost typically falls to the homeowner unless it's negotiated into a property sale.
No — they're sequential. The abatement crew removes and clears the old material first, the exposed substrate is inspected, and only then does standard re-side work begin.
Sources
Authoritative references
- Contractors State License Board (CSLB) — verify a California contractor
- James Hardie — official product & installation resources
External links to government, code, and manufacturer sources. Sierra Siding is not affiliated with these organizations; references are provided for verification.