Why CDM Regulations Are Your First Line of Defence Against Asbestos on Construction Sites
Asbestos remains the single biggest cause of work-related deaths in the UK. For anyone managing or commissioning construction work, addressing asbestos risks through CDM regulations is not optional — it is a legal duty with serious consequences if ignored.
Understanding how the Construction Design and Management (CDM) Regulations interact with asbestos legislation is essential for every client, principal designer, and contractor working on UK building projects. Whether you are refurbishing a Victorian office block or demolishing a post-war industrial unit, the rules are clear: asbestos must be identified, assessed, and managed before work begins.
Here is what you need to know to stay compliant and keep your workers safe.
What the CDM Regulations Actually Require
The Construction Design and Management Regulations set out a framework of duties for everyone involved in construction projects — from the client who commissions the work to the contractors who carry it out. CDM 2015 replaced earlier versions of the regulations and applies to all construction work in Great Britain, regardless of scale.
This means a small domestic extension falls under these rules just as much as a major commercial redevelopment. There is no minimum project size that exempts you from the duty to manage health and safety risks, including asbestos.
The Core Duty Holders
CDM 2015 identifies specific duty holders, each with defined responsibilities:
- Clients — those who commission construction work and are responsible for ensuring the right people are appointed and the right information is provided
- Principal designers — responsible for planning, managing, and coordinating health and safety during the pre-construction phase
- Principal contractors — responsible for planning and managing the construction phase, including controlling site risks
- Designers — must eliminate or reduce foreseeable risks, including asbestos hazards, through their design choices
- Contractors and workers — must follow the construction phase plan and report any hazards they encounter
Every one of these roles carries a direct responsibility when it comes to asbestos. The regulations do not allow any duty holder to pass the problem entirely to someone else.
Addressing Asbestos Risks Through CDM Regulations: The Legal Framework
CDM regulations work alongside the Control of Asbestos Regulations, which govern how asbestos must be managed in non-domestic premises and during construction work. Together, these two sets of regulations create a robust legal framework that construction teams must navigate carefully.
The Control of Asbestos Regulations require duty holders to manage asbestos in non-domestic buildings. Regulation 4 specifically places a duty to manage asbestos on those responsible for premises. When a construction project begins, the CDM framework ensures this duty is carried through into the design and construction phases.
Where HSG264 Fits In
HSG264 is the HSE’s guidance document on asbestos surveying. It defines the two main types of asbestos survey used in construction contexts:
- Management surveys — used to locate and assess asbestos-containing materials (ACMs) that could be disturbed during normal occupancy and low-risk maintenance work
- Refurbishment and demolition surveys — required before any intrusive work begins; these are more thorough and involve destructive inspection to locate all ACMs that might be disturbed
For any construction project involving an existing building, a refurbishment and demolition survey is typically required before work starts. This is not a recommendation — it is a legal expectation under the combined framework of CDM and the Control of Asbestos Regulations.
The Role of Asbestos Surveys in Construction Planning
Getting an asbestos survey completed early in the project lifecycle is one of the most effective steps a project team can take. Discovering asbestos mid-project is costly, disruptive, and dangerous. Discovering it before work begins allows the team to plan around it properly.
The survey results feed directly into the pre-construction information pack that clients must provide under CDM 2015. Principal designers then use this information to make design decisions that reduce the risk of disturbing asbestos during construction. Principal contractors incorporate the findings into the construction phase plan.
What Survey Results Must Cover
A compliant asbestos survey for a construction project should identify:
- The location of all suspected or confirmed ACMs within the scope of the works
- The condition of each material and its likelihood of releasing fibres
- The type of asbestos present, confirmed through laboratory asbestos testing
- A risk assessment for each ACM, informing decisions about removal, encapsulation, or management in place
- Recommendations for how the construction team should proceed safely
These findings must be shared with all relevant duty holders and incorporated into the project’s safety documentation. Keeping this information locked in a site manager’s drawer is not compliance.
Air Monitoring During Construction Work
Where asbestos work is being carried out on site, air monitoring is required to ensure fibre concentrations remain within safe limits. The control limit under the Control of Asbestos Regulations is 0.1 fibres per cubic centimetre of air, averaged over a four-hour period. A short-term limit of 0.6 fibres per cubic centimetre applies over a ten-minute period.
These limits apply to licensed asbestos work. Non-licensed work still requires appropriate controls, and air monitoring should be used to verify that those controls are effective.
Responsibilities of Each Duty Holder in Asbestos Management
What Clients Must Do
Clients carry more responsibility under CDM than many realise. Before appointing a principal designer or principal contractor, a client must ensure they have the skills, knowledge, and experience to manage asbestos risks appropriately. Appointing an unqualified team to save money is not a defence if something goes wrong.
Clients must also provide pre-construction information to the project team. If an asbestos management survey or previous survey exists for the building, this must be shared. If no survey exists, the client should commission one before work begins — or ensure the principal designer does so as part of the pre-construction phase.
Clients must approve the construction phase plan before work starts. If that plan does not adequately address asbestos risks, the client has grounds to reject it and require revisions.
What Principal Designers Must Do
Principal designers are responsible for coordinating health and safety during the design phase. In practice, this means reviewing the asbestos survey findings and using them to influence design decisions. If a structural wall contains asbestos insulating board, a good principal designer will explore whether the design can avoid disturbing it — or ensure the plan for managing it is robust.
The principal designer must also ensure that the pre-construction information pack is complete and accurate before passing it to the principal contractor. Gaps in asbestos information at this stage create serious risks during construction.
What Principal Contractors Must Do
Principal contractors take on responsibility for asbestos management once the construction phase begins. The construction phase plan must include:
- Details of any ACMs within the scope of works
- Procedures for how asbestos will be managed or removed
- Emergency procedures if unexpected asbestos is discovered
- Details of licensed contractors appointed for notifiable asbestos work
- Arrangements for air monitoring and personal protective equipment
Principal contractors must also notify the HSE of notifiable asbestos work before it begins. Health records for workers exposed to asbestos must be retained for 40 years — a requirement that reflects the long latency period of asbestos-related diseases.
What Happens When Unexpected Asbestos Is Found
Even with thorough pre-construction surveys, unexpected asbestos is sometimes discovered during work. Every construction phase plan should include a clear procedure for this scenario.
Work in the affected area must stop immediately. The area should be isolated, and a licensed surveyor should be called to assess the material before any decision is made about how to proceed. Carrying on regardless is one of the most serious mistakes a contractor can make — and one that courts and the HSE take an extremely dim view of.
If you are unsure whether a material contains asbestos, treat it as though it does. Arrange for asbestos testing of a sample before any further disturbance takes place. This is the only way to make an informed decision about how to proceed safely.
Coordination Between Stakeholders: Making Asbestos Management Work in Practice
The CDM framework is built on the principle that safety is a shared responsibility. For asbestos management specifically, this means regular, structured communication between all parties throughout the project lifecycle.
Practical steps that make a real difference include:
- Pre-construction briefings — ensuring all contractors and subcontractors are briefed on asbestos findings before they set foot on site
- Regular site safety meetings — keeping asbestos risks on the agenda throughout the project, not just at the start
- Clear signage — marking areas where ACMs are present or where asbestos work is being carried out
- Written records — documenting every asbestos-related decision, inspection, and action taken during the project
- Training — ensuring all site workers have completed asbestos awareness training appropriate to their role
Asbestos awareness training is a legal requirement for anyone whose work could disturb asbestos-containing materials. This is not limited to those doing licensed asbestos work — it applies to electricians, plumbers, joiners, and any other trade working in buildings that may contain ACMs.
Compliance and Enforcement: The Consequences of Getting It Wrong
The HSE takes asbestos breaches seriously. Enforcement action can range from improvement notices and prohibition notices to prosecution. Fines for asbestos-related offences are unlimited in the Crown Court, and custodial sentences are possible for the most serious breaches.
Beyond the legal consequences, the human cost is devastating. Mesothelioma, asbestosis, and asbestos-related lung cancer are fatal diseases. Workers exposed to asbestos today may not develop symptoms for 15 to 60 years — by which time the damage is irreversible.
Directors and senior managers can be held personally liable for failures in asbestos management. The CDM framework is designed to ensure accountability sits with named individuals, not just with companies as abstract entities.
The Health and Safety File
At the end of a project, the principal designer is responsible for preparing or updating the health and safety file. Where asbestos has been found, removed, or left in place and managed, this must be documented in the file.
Future building owners and duty holders rely on this information to manage asbestos safely during subsequent works. An incomplete or inaccurate health and safety file is not just a paperwork failure — it is a hazard for everyone who works in or on that building in the future.
Regional Asbestos Survey Support for Construction Projects
Construction projects are happening across the UK every day, and the need for timely, accurate asbestos surveys is constant. Supernova Asbestos Surveys provides refurbishment and demolition surveys, management surveys, and asbestos testing services to construction teams nationwide.
For projects in the capital, our asbestos survey London service covers the full range of survey types required under CDM and the Control of Asbestos Regulations, with fast turnaround times to keep your project on schedule.
In the North West, our asbestos survey Manchester team works closely with principal contractors and principal designers to integrate survey findings into construction phase plans from day one.
For projects in the Midlands, our asbestos survey Birmingham team delivers thorough refurbishment and demolition surveys that meet the requirements of both CDM and the Control of Asbestos Regulations — giving your project the solid foundation it needs before a single wall is touched.
Frequently Asked Questions
Do CDM regulations apply to small construction projects?
Yes. CDM 2015 applies to all construction work in Great Britain, regardless of project size or duration. There is no minimum threshold that exempts a project from the duty to manage health and safety risks, including asbestos. Even a modest refurbishment of a pre-2000 building can involve asbestos-containing materials, and the legal duties apply in full.
What type of asbestos survey is required before construction or refurbishment work?
Under HSG264 and the combined framework of CDM and the Control of Asbestos Regulations, a refurbishment and demolition survey is required before any intrusive or structural work begins on an existing building. This is a more thorough survey than a standard management survey and involves destructive inspection to locate all ACMs that might be disturbed during the works.
Who is responsible for commissioning an asbestos survey under CDM?
Ultimately, the client holds responsibility for ensuring pre-construction information — including asbestos survey data — is gathered and shared with the project team. In practice, the principal designer often coordinates this during the pre-construction phase. However, if no survey exists and the client fails to commission one, that failure rests with the client under CDM 2015.
What should happen if asbestos is discovered unexpectedly during construction work?
Work in the affected area must stop immediately. The area should be isolated and clearly marked. A licensed asbestos surveyor should be called to assess the material before any further disturbance takes place. The construction phase plan should already contain a procedure for this scenario — if it does not, that is itself a compliance failure that the principal contractor must address.
How long must health records for asbestos-exposed workers be kept?
Under the Control of Asbestos Regulations, health records for workers who have been exposed to asbestos must be retained for 40 years. This lengthy retention period reflects the fact that asbestos-related diseases such as mesothelioma can take several decades to develop after initial exposure.
Get Expert Asbestos Survey Support for Your Construction Project
Addressing asbestos risks through CDM regulations requires the right surveys, the right documentation, and the right expertise at every stage of your project. Supernova Asbestos Surveys has completed over 50,000 surveys nationwide and works with clients, principal designers, and principal contractors across the UK to deliver the compliant, timely survey services that construction projects demand.
Call us on 020 4586 0680 or visit asbestos-surveys.org.uk to discuss your project requirements and book a survey.