Refurbishment and Demolition Asbestos Survey Process: Scope, Sampling Density and Analyst Accreditation

Summary

There are two types of asbestos survey in common use under CAR 2012: the management survey and the refurbishment and demolition (R&D) survey. This article covers the R&D survey — the more comprehensive of the two. The distinction matters because the consequences of missing an ACM in a management survey are different from missing one in an R&D survey. A management survey is about managing in-situ ACMs that are not going to be disturbed. An R&D survey is about finding every ACM in areas that are about to be physically disturbed, so that a plan for safe removal or management can be implemented before work starts.

The HSE surveying guidance document (HSG264) defines an R&D survey as intrusive, destructive, and comprehensive. The surveyor must lift floorboards, open ceilings, remove boxing, drill into structural elements, and access roof spaces, service voids, and plant rooms. Areas that cannot be accessed must be noted as unconfirmed and treated as presumed to contain asbestos until confirmed otherwise. The report must include a plan of all sampled and presumed ACM locations, condition assessments, and risk priority scores for each identified material.

For tradespeople, the practical implication is straightforward: if you are quoting or planning work that will disturb the fabric of a pre-2000 building — a bathroom strip-out, a kitchen refurb, removing a partition wall, replacing a boiler, fitting a new heating system, or partial demolition — the client needs an R&D survey first. If they do not have one, do not start the structural work. This is not an optional extra; it is a legal requirement under Regulation 4 and Regulation 7 of CAR 2012 (the duty to manage and the duty to identify before work starts).

Key Facts

• Regulation requiring survey — Regulation 7, CAR 2012: "Every employer shall ensure that before any work which is liable to disturb asbestos is commenced, the area in which work is to take place is assessed..."
• Survey types — management survey (in-use buildings, periodic inspection of accessible areas) vs. R&D survey (before refurbishment or demolition)
• R&D survey scope — must cover all areas to be disturbed; must be intrusive; must include physical sampling
• Presumed ACMs — where access is not possible, the surveyor must presume the presence of asbestos and note this in the report; presumed ACMs must be managed as if confirmed positive
• Sampling density — HSG264 recommends bulk sampling of all suspect materials; homogeneous areas (same material, same application) can be sampled as a single material but multiple samples improve confidence
• Minimum samples per material — HSG264 guidance is typically 3 samples per homogeneous ACM material in large areas; smaller areas or isolated materials may be confirmed by a single sample; the surveyor's professional judgment applies [verify]
• Laboratory analysis — samples must be tested by a UKAS-accredited laboratory using polarised light microscopy (PLM) or dispersion staining techniques; the laboratory must be accredited under ISO 17025
• Surveyor competence — surveyors should be UKAS-accredited under ISO 17020 (inspection body accreditation for asbestos surveying) or hold equivalent individual certification (e.g. BOHS P402 certificate of competence for buildings surveyors)
• BOHS P402 — British Occupational Hygiene Society qualification for surveying buildings for asbestos; widely regarded as the minimum individual competence benchmark
• Report contents — ACM location, description, extent, condition, risk priority rating, recommendations (remove, encapsulate, manage), photographs, laboratory results
• Risk priority score — calculated from material score (type and condition) + priority score (location, use, accessibility, maintenance activity); used to prioritise management actions
• CDM 2015 — on notifiable construction projects, the principal designer must ensure pre-construction information (including asbestos survey results) is gathered and communicated to contractors
• Cost — R&D surveys range from a few hundred pounds for a small domestic property up to several thousand for large commercial buildings; cost varies significantly by location, building type, and scope
• Duration — a small domestic R&D survey may take half a day; a large commercial building may take several days to survey and a week or more for laboratory results

Quick Reference Table

Detailed Guidance

When is an R&D Survey Required?

The trigger is work that will disturb the fabric of a pre-2000 building. The HSE takes a broad view of what constitutes "disturbing the fabric." This includes:

• Removing or replacing floor coverings (vinyl tiles, sheet vinyl, carpet over old adhesive)
• Strip-out of kitchens or bathrooms, including removal of wall and floor tiles, floor screeds, and ceilings
• Removing or altering partition walls (especially older dry-lining or timber-framed partitions)
• Replacing boilers, radiators, or other heating components — particularly where lagged pipework is present
• Opening ceilings or floor voids for services installation
• Roof replacement or repair involving removal of existing roofing materials
• Structural alterations including new openings, lintels, and extensions to older structures
• Full or partial demolition

A management survey is not sufficient for any of the above. If a client presents you with a management survey and asks you to begin refurbishment work, check whether the survey covers the specific areas and materials that will be disturbed. If it does not, a further R&D survey is required for those areas.

The Surveying Process: Step by Step

Stage 1: Pre-survey preparation

The surveyor begins by reviewing available information about the building: planning records, building regulations applications, any existing asbestos surveys, construction dates, and known occupational history. This context informs which materials are likely to be present. An office block from 1965 has a different suspect ACM profile from a 1930s terraced house or a 1980s agricultural building.

The client must ensure the surveyor has unrestricted access to all areas to be included in the survey scope. Areas that cannot be accessed must be agreed in advance and noted in the report as unconfirmed.

Stage 2: Site survey — visual inspection and sampling

The surveyor systematically works through the building, recording all materials that could be ACMs. In an R&D survey, the surveyor will physically disturb finishes to inspect substrates: drilling through ceiling tiles to check above, lifting sections of flooring, opening service risers, removing screwed inspection panels. This is necessarily destructive in some areas.

For each suspect material, the surveyor assesses:

• Material type (lagging, floor tile, ceiling tile, textured coating, soffit board, etc.)
• Extent (measured area or linear metres for pipe work)
• Condition (good, fair, poor — with specific damage categories per HSG264)
• Location and accessibility (important for risk scoring)

Stage 3: Bulk sampling

Physical samples are collected from each identified suspect material. Sampling protocol:

• Sample from the least deteriorated part of the material where possible (to get a representative sample)
• Use a damp cloth to suppress dust at the sampling point
• Take a sample of sufficient size for laboratory analysis — typically a 1cm square section for tiles; a pinch (not a handful) for friable materials
• Place the sample immediately in a sealed, labelled polythene bag
• Record the sample reference against the location plan

Homogeneous materials (the same material from the same area of application) can be grouped as a single material type with multiple samples. The surveyor uses professional judgement on whether materials are truly homogeneous — a ceiling tile in a ground-floor office and a ceiling tile in the basement may look identical but be from different manufacture runs.

Stage 4: Laboratory analysis

Samples are sent to a UKAS-accredited laboratory for analysis. The standard method is polarised light microscopy (PLM), which allows identification of asbestos fibre type. Results are typically returned within three to five working days for a standard service, or within one to two days for an express service (at higher cost).

The laboratory report identifies:

• Whether asbestos fibres were found
• The fibre type (chrysotile, amosite, crocidolite, or others)
• An estimate of fibre content (percentage by area under the microscope)

A result of "no asbestos detected" does not mean the sample is guaranteed asbestos-free — it means no asbestos was found in the sample analysed. Homogeneous area assessments can reduce this risk by taking multiple samples from the same material.

Stage 5: Report production

The completed R&D survey report includes:

• A plan or floor plan identifying the location and extent of each ACM or presumed ACM
• A schedule of ACMs with condition ratings, risk priority scores, and recommendations
• Photographs of each ACM (standard in accredited surveys)
• Laboratory results appended as certificates of analysis
• A list of areas where access was not possible and presumptions made

Understanding the Risk Priority Score

HSG264 provides a risk priority scoring system for ACMs in buildings. The score combines two elements:

Material score — based on asbestos type and physical form:

• Sprayed coatings and thermal insulation (lagging): highest score
• Asbestos insulation board (AIB): high score
• Asbestos cement, textured coatings, floor tiles: lower score

Priority score — based on:

• Location (accessibility, likelihood of disturbance)
• Use of the area (high-traffic vs. rarely accessed)
• Maintenance activity level in the vicinity
• Occupancy level

High risk priority scores indicate materials that should be removed or robustly encapsulated. Low scores indicate materials that can be managed in situ with periodic reinspection. The risk priority system is a tool for the asbestos management plan, not a pass/fail test for work commencement.

UKAS Accreditation and Surveyor Competence

UKAS accreditation for asbestos surveying is issued under ISO 17020 (inspection bodies). An accredited surveying organisation has been independently assessed against technical and quality standards covering: competence of personnel, sampling procedures, equipment calibration, quality management, and report format.

In practice, there are two levels at which to check competence:

1. Organisation level — is the surveying company UKAS-accredited under ISO 17020? The UKAS public register lists accredited organisations and their scope of accreditation. Check that the scope includes asbestos surveying.
2. Individual level — does the surveyor hold a relevant individual qualification? The BOHS P402 (Buildings Surveys and Bulk Sampling for Asbestos) is the benchmark. Some surveyors also hold the RSPH Award in Asbestos and P402 is the entry-level certificate for building surveyors.

For small domestic jobs, an unaccredited sole trader surveyor with P402 may be acceptable and significantly cheaper than a large accredited firm. For commercial, industrial, or public sector clients, UKAS accreditation at organisational level is typically required by the client's own procurement standards or insurer.

What the Survey Report Does Not Tell You

An R&D survey report identifies where ACMs are and their condition. It does not:

• Authorise any work to proceed — that requires a risk assessment and method statement from the contractor
• Specify the removal method — that is for the specialist asbestos contractor to determine
• Guarantee that all ACMs have been found — the surveyor can only sample what they can access

Any area that was not fully accessible at survey stage must be treated as containing asbestos until confirmed otherwise by further sampling or visual inspection when that area becomes accessible during the work.

Frequently Asked Questions

The client has an old management survey from 2015. Is that sufficient before I start work?

Probably not — it depends on the scope and age of the survey. A management survey is not designed for pre-refurbishment work. If the scope did not include intrusive inspection of the areas you will be disturbing, the survey does not meet the Regulation 7 requirement. The client needs an R&D survey for the specific areas and materials to be disturbed. Additionally, the 2015 survey may not reflect changes in building condition since then.

Can I carry out an R&D survey myself as the contractor?

Only if you are competent to do so — which in practice means holding BOHS P402 or equivalent certification and having the equipment and procedures to take and submit bulk samples. Most contractors subcontract survey work to a specialist. Carrying out a survey on your own project creates a potential conflict of interest; UKAS-accredited firms are required to manage conflicts of interest under their accreditation conditions.

What happens if ACMs are found during the R&D survey?

The survey report will include recommendations: remove before work, encapsulate, or manage in situ. For each ACM in the work zone, the client must arrange appropriate action before the refurbishment contractor begins work on that area. Licensed ACMs (lagging, AIB) require a licensed removal contractor. Non-licensed ACMs can be handled by a non-licensed contractor with appropriate controls. The asbestos work must be completed and cleared before the main refurbishment work proceeds in that area.

How much does an R&D survey cost?

Costs vary significantly. A small domestic extension or kitchen strip-out survey might cost £250–£600. A medium commercial office strip-out survey might be £800–£2,000. A large industrial building or full demolition survey can run to several thousand pounds. Laboratory testing is usually included in the surveyor's quote but confirm this. Always use a UKAS-accredited or P402-qualified surveyor — the false economy of using an unqualified surveyor is rarely worth the liability risk.

Do I need an R&D survey for a property built after 2000?

Generally no — asbestos products were banned in new construction in the UK in November 1999. A building with a demonstrated construction date of 2000 or later using contemporary materials does not require an asbestos survey. However, exercise caution where: the building incorporates older structure (e.g. a Victorian house with a 2002 extension — the original fabric still needs assessment); the construction date is uncertain; or there is evidence of earlier materials being reused in the newer build.

Regulations & Standards

• Control of Asbestos Regulations 2012 (SI 2012/632) — Regulation 7: assessment of asbestos before work commences; Regulation 4: duty to manage

• HSG264 — Asbestos: The Survey Guide — HSE guidance document; the definitive reference for management and R&D survey methodology, sampling, and reporting

• HSE L143 — Managing and Working with Asbestos (ACOP) — Approved Code of Practice; survey requirements in the context of work planning

• ISO 17020 — general criteria for the operation of various types of bodies performing inspection; used for UKAS accreditation of asbestos surveying organisations

• ISO 17025 — general requirements for the competence of testing and calibration laboratories; used for UKAS accreditation of asbestos analysis laboratories

• BOHS P402 — British Occupational Hygiene Society Certificate of Competence in Surveying Buildings for Asbestos; the UK individual benchmark for building surveyors

• Construction (Design and Management) Regulations 2015 (CDM 2015) — Regulation 4: client duty to provide pre-construction information including asbestos survey results; principal designer duty to ensure hazard information is gathered

• HSG264 — Asbestos: The Survey Guide — definitive HSE guidance on survey types, sampling, and reporting

• HSE — Asbestos surveys: what you need to know — overview for duty holders and contractors

• UKAS — Find an accredited body — search for ISO 17020-accredited asbestos surveying organisations

• UKAS — Find an accredited laboratory — search for ISO 17025-accredited asbestos analysis laboratories

• BOHS — P402 qualification — information on the P402 certificate of competence for surveying buildings

• asbestos awareness training — training required for workers following survey and before asbestos work

• asbestos in pipe lagging — high-risk ACM commonly identified in R&D surveys of older buildings

• asbestos cement products — lower-risk ACM commonly found in R&D surveys of pre-1990 outbuildings

• asbestos floor tiles — common ACM identified in floor surveys; management vs removal decisions