CDM 2015 Explained: What Small Contractors Actually Need to Know
Pro Site Docs · Guide
The Construction (Design and Management) Regulations 2015 — CDM 2015 — apply to virtually every construction project in the UK, however small. Yet a lot of contractors and tradespeople aren't fully sure what their duties are, who's responsible for what, or what paperwork they actually need.
Here's a plain-English breakdown of CDM 2015 aimed at the people who usually get least guidance on it: small contractors and sole traders.
What is CDM 2015?
CDM 2015 is the main set of regulations covering health, safety and welfare in construction. Its purpose is simple: to make sure risks are managed sensibly throughout a project, from design through to completion. It applies to all building and construction work — new build, refurbishment, maintenance, demolition, and more.
A common myth is that CDM only applies to big projects. It doesn't. Even a small domestic job falls under CDM 2015; the difference is how much paperwork and formality is needed.
The key duty holders
CDM defines several roles. On a small job, one person or company might wear several hats:
- Client — the person the work is being done for. They have duties even on domestic jobs (though on domestic work some duties pass to the contractor).
- Principal Designer — manages health and safety during the design/planning phase (required when there's more than one contractor).
- Principal Contractor — manages health and safety during the construction phase (again, required with more than one contractor).
- Designers — anyone preparing designs, who must consider health and safety in what they design.
- Contractors — anyone carrying out the actual construction work.
If you're a sole trader doing a small job, you may effectively be the contractor and be picking up duties that would otherwise sit with a principal contractor.
What paperwork does CDM require?
Depending on the project, CDM-related documents can include:
- A construction phase plan — required for every project (even small ones need a proportionate version). It sets out how health and safety will be managed during the work.
- Risk assessments and method statements (RAMS) — showing how specific risks are controlled.
- A health and safety file — for projects with more than one contractor, handed over at the end.
- Notification to the HSE (F10) — only required for larger/longer projects that meet certain thresholds.
The most common gap for small contractors is the construction phase plan — many don't realise even a modest job needs one.
What small contractors get wrong
- Assuming CDM doesn't apply to small or domestic jobs — it does.
- No construction phase plan — thinking it's only for big sites.
- Unclear roles — not knowing which duties they've picked up.
- Generic paperwork — using documents that don't reflect the actual project.
Keeping it proportionate
The good news: CDM is meant to be proportionate. A small, low-risk job doesn't need the same mountain of paperwork as a major development. The regulations expect sensible, proportionate management of risk — not box-ticking for its own sake. The trick is having the right documents for the size and risk of the job, properly filled in.
The bottom line
CDM 2015 applies to your work whether the job is big or small. Know which duties you're holding, make sure you've got a proportionate construction phase plan and proper RAMS in place, and keep everything specific to the actual project. Get the paperwork right and CDM becomes routine rather than a worry.
Get compliant fast with our CDM 2015 document templates and construction phase plans, or see the Principal Contractor CDM Pack.