Stage 1 — Notification and project approval
Before any removal work can begin, the contractor must notify the relevant national or regional authority. In the UK, notifiable non-licensed work (NNLW) and fully licensed work both require advance notification to the HSE. In France, the employer must send a plan de retrait to the DIRECCTE and the CARSAT at least one month before work starts. In Spain, the RERA-registered contractor must submit a plan de trabajo to the autoridad laboral and wait for approval before starting. These are not formalities — they are legal prerequisites, and removal work carried out without approval is subject to criminal penalties in most jurisdictions.
As a client, ask for and read a copy of the notification or plan. It should describe the scope of the work, the methods to be used, the personal protective equipment, the containment strategy, the waste route and the clearance procedure. If the contractor cannot show you a notification number or a stamped approval, they are not ready to start work.
Stage 2 — Risk assessment and method statement
For every removal project, the contractor must produce a written risk assessment and method statement (RAMS) specific to the site and the scope of work. This document is the operational plan. It identifies the ACMs to be removed (referencing the survey report), describes the step-by-step procedure, defines the exclusion zones, specifies the respiratory protection (RPE) and personal protective equipment (PPE) for each task, lists the air monitoring requirements, and sets the emergency procedures.
The RAMS should be signed by a competent person — typically the project manager or licensed supervisor — and it should be reviewed with the site team before work starts. Clients are entitled to ask for a copy and to see how it will be monitored during the work.
Stage 3 — Site preparation and isolation
Before a single fiber of asbestos is disturbed, the work area must be prepared and isolated from the rest of the building. The steps are always the same, in some version:
- Power, water, gas and ventilation services in the work area are isolated and locked off.
- Furniture and fixtures that cannot be removed are wrapped and sealed.
- A physical barrier — plastic sheeting on a timber or scaffold frame — is built around the work area to create an enclosure.
- The enclosure is sealed at all joints with tape and checked for leaks.
- A dedicated entry and exit point is set up, usually with a 3-stage decontamination unit (clean room, shower, dirty room).
- Negative pressure units (NPUs) with HEPA filtration are installed to pull air from the enclosure to a sealed extract, so any released fibers travel away from the rest of the building.
- Smoke testing is performed to verify enclosure integrity and correct airflow direction.
The test for a compliant enclosure is that air flows only in one direction: from the surrounding building into the enclosure. If smoke sent through a suspected leak point flows out of the enclosure, it is not compliant and work cannot begin.
Stage 4 — The decontamination unit
Every compliant licensed removal project has a decontamination unit (DCU). It is either attached directly to the enclosure or positioned nearby with a sealed transit route. A 3-stage DCU has three separate chambers: a clean room for storing PPE and clean clothing, a shower room with hot water, and a dirty room at the enclosure side where contaminated PPE is bagged before showering.
Every worker entering or leaving the enclosure must pass through the DCU in the correct direction. They must shower between exits — not just rinse. They must change out of contaminated overalls and respirators before entering the clean room. This procedure is what prevents fibers from traveling home on workers' clothes and bodies, and it is the single most important protection against secondary household exposure.
Stage 5 — The actual removal
With the enclosure built, the DCU operational, the NPU running, and the risk assessment approved, the actual removal can begin. The technique depends on the ACM:
- Sprayed coatings and friable insulation — Wet stripping with a controlled fine water spray, hand-held scrapers and bags for immediate double-bagging.
- Insulation board (AIB) — Whole-panel removal where possible, avoiding breaking. Screws and fixings are cut rather than unscrewed to avoid vibration.
- Textured coatings — Softening with chemical gel or water, then gentle scraping. Dry sanding is never permitted.
- Fibercement products — Whole-sheet removal where possible, avoiding breaking. Cutting is done with hand saws, never power tools.
- Pipe lagging — Careful wet stripping section by section, with the exposed pipe wrapped for containment.
- Floor tiles and vinyl with asbestos backing — Cold lifting after adhesive softening; shot-blasting and sanding are prohibited.
Stage 6 — In-process air monitoring
Throughout active removal, the contractor must carry out leak testing outside the enclosure to verify that the containment is holding. This is done by an independent analyst (not the contractor), and results are typically expected within hours of sampling. If leak testing shows fibers outside the enclosure, work must stop immediately, the source of the leak must be found and repaired, and the surrounding area must be cleaned before work resumes.
At the same time, personal exposure monitoring is done inside the breathing zone of the workers to verify that their respiratory protection is adequate. The RPE is selected based on the expected fiber concentration, and if the measured concentration is higher than expected, a stronger mask with a higher assigned protection factor is required.
Stage 7 — Cleaning and visual inspection
Once the ACM has been removed and bagged, the enclosure must be cleaned to a visually clean standard. Loose debris is collected, surfaces are wet-wiped with dampened cloths (disposed of as contaminated waste), and HEPA vacuuming is performed on every accessible surface. Dust is removed from ledges, beams, corners, tops of doors and behind radiators — everywhere that might catch settled fiber.
A thorough visual inspection is then carried out by the analyst. The enclosure must pass a "fine dust" standard — no visible dust anywhere. If the analyst finds any dust, cleaning is repeated and the inspection is redone. This step is not optional and not a formality; it is the precondition for clearance sampling.
Stage 8 — Clearance sampling
With the enclosure visually clean, clearance sampling begins. The independent analyst sets up sampling pumps inside the enclosure at defined positions (usually including corners, voids and previously heavily contaminated areas). While pumps run, the analyst or a contractor creates gentle air disturbance with a leaf blower or fans to resuspend any remaining fibers. The samples are then analyzed — by PCM for most European jurisdictions, by TEM in higher-specification contexts — and compared against the clearance threshold (typically 0.01 f/ml in Europe).
If clearance passes, the analyst issues a Certificate of Reoccupation. If it fails, cleaning is repeated and sampling is done again. The certificate is the document that legally permits the enclosure to be dismantled and the area to be handed back to the building owner.
Stage 9 — Enclosure dismantling and waste handover
After clearance, the enclosure sheeting, tape, fixtures and NPU filters are all treated as contaminated waste, double-bagged, sealed with asbestos warning tape and removed to an authorized waste consignment point. The decontamination unit is also cleaned and dismantled. The site is restored to a state that allows normal reoccupation.
All waste leaves the site under a formal consignment note (in the UK), bordereau de suivi des déchets amiante (BSDA, in France), documento de identificación de residuos (in Spain) or equivalent national waste tracking document. A copy of the signed consignment note must be provided to the client as proof of correct disposal.
Stage 10 — The handover pack
At the end of the project, the contractor should deliver a complete handover pack to the client. This is the legal record of the removal and will be needed for any future building sale, insurance claim or regulatory inspection. A compliant handover pack includes:
- The original asbestos survey that identified the ACMs.
- The notification or plan de travail and its regulatory approval reference.
- The risk assessment and method statement.
- All air monitoring results from before, during and after work.
- The Certificate of Reoccupation from the independent analyst.
- Signed waste consignment notes for every load of asbestos waste removed.
- Photographs documenting the removal and clearance.
- An updated asbestos register showing the removed materials.
Red flags and warning signs
A compliant removal project looks professional, slow and procedural. The warning signs of a non-compliant project are familiar to anyone who has seen them before:
- No visible enclosure, or the enclosure has open doors or broken seals.
- Workers without respirators, or respirators hanging loose around the neck.
- Dry removal techniques such as sanding, grinding or power cutting.
- No negative pressure unit running.
- No decontamination unit, or workers skipping it on the way out.
- No independent air monitoring, or the "analyst" is clearly employed by the contractor.
- Bags of asbestos waste stored openly on a public skip or transported in an unmarked van.
- No notification paperwork on site when requested.
If you observe any of these at a site where asbestos is being removed, stop work and contact the national regulator (HSE, DIRECCTE, ITSS, etc.). You are not being difficult — non-compliant removal is a public health risk that exposes you, workers and neighbors to an incurable disease.