CDM 2015 client duties
- Applies to
- All construction work, any size
- F10 threshold
- Over 30 working days with more than 20 workers at once, or over 500 person-days
- Enforced by
- HSE
The Construction (Design and Management) Regulations 2015 apply to every building project, including a weekend office refresh. A business or public body that commissions the work is a commercial client, and carries legal duties of its own that cannot be handed to the contractor.
This page sets out those duties in plain terms. It is general guidance based on HSE's published material, not legal advice for a particular project.
The client's duties, in short
- Make suitable arrangements
- Allow enough time and money for the work to be done safely, and make sure the people you appoint have the skills, knowledge and experience for it.
- Appoint in writing
- Where more than one contractor will work on the project, appoint a principal designer and a principal contractor in writing, as early as you can.
- Provide information
- Give designers and contractors the pre-construction information you hold or can reasonably get: drawings, asbestos surveys, services records, how the building is used.
- Check before and after
- Make sure a construction phase plan exists before work starts, welfare facilities are provided, and a health and safety file is prepared and kept.
Register of client duties
| Item | Scope | Guide cost |
|---|---|---|
| Appoint principal designer | Where more than one contractor is involved; in writing | Before design starts |
| Appoint principal contractor | Where more than one contractor is involved; in writing | Before construction starts |
| Pre-construction information | Including asbestos, services and structure | As early as possible |
| Construction phase plan | Drawn up by the principal contractor or contractor | Before work starts |
| F10 notification to HSE | Only if the project crosses the threshold | As soon as practicable before work |
| Health and safety file | Prepared by the principal designer; kept by the client | At handover, kept for the building's life |
Summarised from HSE guidance on CDM 2015 and the Regulations themselves. If you do not make the appointments where they are needed, the client must carry out those roles. A guide, not a quote. Build a budget in the cost plan.
What the duties mean on a refurbishment
You are the client even if a fit-out firm "does everything"
A design and build contractor can be appointed as principal designer and principal contractor, which is common on fit-outs. That does not remove the client's own duties: you still have to make suitable arrangements, provide information and check that the plan and file exist. Where a client fails to appoint a principal designer or principal contractor on a project that needs them, the Regulations say the client must fulfil those roles.
Asbestos is the information most often missing
For refurbishment, the single most important piece of pre-construction information is usually the refurbishment and demolition asbestos survey of the areas to be disturbed. A management survey alone is not enough. HSE's HSG264 explains the difference. Commission it before the work is priced.
Notification is about size, not risk
A project is notifiable to HSE (using form F10) if construction work will last longer than 30 working days and have more than 20 workers working at the same time at any point, or will exceed 500 person-days. The client is responsible for notifying, though the principal designer or contractor often does it on the client's behalf. Most single-floor refurbishments with a sizeable team cross the 500 person-day line.
Occupied buildings need extra thought
When staff, pupils, patients or customers stay in the building, the client knows things the contractor does not: who is where and when, fire evacuation routes, deliveries, vulnerable people. Share that early and agree how the site will be separated from the occupied areas.
Building regulations dutyholders
Since October 2023, the Building Regulations in England also give clients, principal designers and principal contractors dutyholder and competence duties for building regulations compliance. They sit alongside CDM, with the same role names but a different purpose. Your contractor should be able to explain how both are covered.
Where our information comes from
- HSE, CDM 2015: commercial clients, roles and responsibilities
- HSE, CDM 2015: notifying a construction project (F10)
- HSE, L153 Managing health and safety in construction (CDM 2015 guidance)
- The Construction (Design and Management) Regulations 2015, legislation.gov.uk
- HSE, HSG264 Asbestos: the survey guide
- GOV.UK, Design and building work: meeting building requirements (dutyholders and competence)
Cost ranges are typical figures from published UK cost guides and price guides, read November 2026, given before VAT. Firms that publish them are not named.
A contractor used to CDM will tell you what they need from you on day one.
Brief a contractorHow the work gets done
Where the client's CDM duties fall in a refurbishment.
Before design
Decide the budget and time, gather drawings and surveys, commission the asbestos survey, appoint a principal designer.
Before tender
Issue pre-construction information to everyone pricing, and check the competence of those you shortlist.
Before work starts
Appoint the principal contractor, see the construction phase plan, confirm welfare facilities, notify HSE if needed.
At handover
Receive the health and safety file, keep it with the building, and pass it on if you sell or let.
CDM questions
Do the CDM Regulations apply to small refurbishments?
When must a project be notified to HSE?
What is a principal designer?
What is a principal contractor?
What happens if we do not appoint them?
Does CDM apply to schools and NHS buildings?
Keep reading
- F10 notification
When it is needed and who sends it.
- Pre-construction information
What to gather before anyone prices.
- Office refurbishment
Scopes and costs.
- School refurbishment
Working around pupils and holidays.
Brief a contractor who works to CDM
Three short steps: where the building is, what the scope is, and who to speak to. Rough answers are fine; a contractor firms them up on a site visit.
Your brief stays with us until you approve the independent commercial refurbishment contractor we name for your building.
Received. This is what happens next.
- We find an independent commercial refurbishment contractor working in your part of the country on projects of this scale and sector, and contact you with the firm's name.
- Nothing goes to them until you say yes.
- Once you approve, the firm books a visit and follows up with a written proposal. You won't hear from us again unless you ask.