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Do you need independent verification that your asbestos works have been completed correctly and it’s safe for you to reoccupy. Find out more below, click to get a 4 stage clearance quote or request a call back.

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Four stage clearances are also known as Certificates for Reoccupation. The key thing you need to know when asbestos removal works have been undertaken in your premises is that the former work area has been assessed to ensure it is thoroughly clean and is fit for reoccupation, prior to the area returning to normal use.

This assessment must be undertaken by an independent company (i.e. not the licensed contractor themselves) which is UKAS accredited in accordance with ISO 17025.

The 4 stage clearance certification process is the most important part of any asbestos removal project and you should ensure that you engage the right company.

  • Fixed price quote

    No nasty hidden extras.

  • National and International coverage

    You only need engage a single company for multiple locations.

  • Free asbestos remediation consultation and advice with every job

    Lets you know your best options for on-going management of any asbestos.

  • Chairing member of ATaC

    (Asbestos Testing and Consultancy Association)


Obligations for 4-stage clearance

Independent of the removal contractor, employ the services of a UKAS accredited agency, in accordance with ISO 17025

Employ qualified and experienced personnel to carry out the work.

The multi-stage certification process is set up to allow the inspection and assessment to be undertaken in a structured, systematic and consistent manner.

The individual stages of 4-stage clearance

As set out in HSG 248 Asbestos: The analysts’ guide for sampling, analysis and clearance procedures:

Stage 1: Preliminary check of site condition
Stage 2: Thorough visual inspection inside the enclosure area
Stage 3: Air monitoring
Stage 4: Final assessment post-enclosure area dismantling
Only when all of stages have been completed satisfactorily can the Certificate of Reoccupation be issued.


Full UK coverage

Acorn Analytical Services have two locations, each equipped with a comprehensive testing laboratory and we so are ideally located to provide our services nationally. Our asbestos analysts undertake asbestos 4 stage clearances anywhere in the UK.

What’s the cost of our asbestos testing services?

To discuss your 4 stage clearance requirements or to obtain a quotation call us using the number at the top of the page, email us or complete our online quotation form.


Since working with Acorn they have exceeded the council’s expectations with their high standards and innovative working methods.
Asbestos 4 Stage Clearance
– Fiona Price (Asbestos Officer)


Reasons to Use Acorn

  • Here to help you become asbestos compliant
  • Here to identify any gaps within your asbestos compliance procedures
  • We are a fully independent UKAS accredited asbestos consultancy
  • We provide impartial, best practise advice no matter what we find

Our Core Values

Quality – Implement excellence in everything we do
Integrity – Be honest and truthful
Respect – Treat others how we wish to be treated
Teamwork – Work together for the benefit of the team
Innovation – Innovate to always be leading our industry

Our Vision

To be the obvious choice for asbestos consultancy services in the UK.

Our Mission

Ensuring safety above profit. Keeping quality within the core of everything we do. Guaranteeing speed in the delivery of our services.