When must a construction project be notified to the HSE?
Under CDM 2015, the client gives the HSE notice of a notifiable project as soon as is practicable before the construction phase begins. A project is notifiable above a working day and worker threshold, or a person day threshold. The HSE takes the notice through its online form F10, and the notice is displayed in the site office.
The thresholds, the notice and the display
A project is notifiable if the construction work on a site is scheduled to last longer than 30 working days and have more than 20 workers working at the same time at any point, or to exceed 500 person days (reg 6(1)); a working day is any day on which construction work takes place (reg 2(1)).
These are the thresholds for the duty, not its window: 'as soon as is practicable before the construction phase begins' has no day count, so no window is recorded. These Regulations name no form; the HSE takes the notice only through its online form F10 and no longer accepts paper, email or post (hse.gov.uk/forms/notification/f10.htm, read 2026-10-09).
| Duty | Window and section | If missed |
|---|---|---|
| Where the project is notifiable, give the HSE written notice with the Schedule 1 particulars as soon as is practicable before the construction phase begins | none setThese are the thresholds for the duty, not its window: 'as soon as is practicable before the construction phase begins' has no day count, so no window is recorded.reg 6(1)-(5); Sch 1 | an offenceLapsed compliance |
| Display the notification clearly in the construction site office, where any worker can read it, and update it when needed | none setA standing duty for as long as the site office exists, with no day count, so no window is recorded.reg 6(3)(b), 6(3)(c) | an offenceLapsed compliance |
What the library notes on each duty
Quoted a whole sentence at a time from the library's note on each row.
Where the project is notifiable, give the HSE written notice with the Schedule 1 particulars as soon as is practicable before the construction phase begins
reg 6(1)-(5); Sch 1 · none set · an offence
- Binds the client (the contractor or principal contractor where the client is domestic, reg 7(1)).
- A project is notifiable if the construction work on a site is scheduled to last longer than 30 working days and have more than 20 workers working at the same time at any point, or to exceed 500 person days (reg 6(1)); a working day is any day on which construction work takes place (reg 2(1)).
- These are the thresholds for the duty, not its window: 'as soon as is practicable before the construction phase begins' has no day count, so no window is recorded.
- Schedule 1 lists 15 particulars, among them the site address, the local authority, the client, principal designer and principal contractor, the planned start date and duration of the construction phase, the estimated maximum number of people on site, and a declaration signed for the client that it is aware of its duties.
- Notice goes to the Office of Rail and Road instead for railway and guided transport work it enforces (reg 6(4)), and to the Office for Nuclear Regulation for a nuclear, authorised defence or new nuclear build site (reg 6(5)).
- These Regulations name no form; the HSE takes the notice only through its online form F10 and no longer accepts paper, email or post (hse.gov.uk/forms/notification/f10.htm, read 2026-10-09).
Display the notification clearly in the construction site office, where any worker can read it, and update it when needed
reg 6(3)(b), 6(3)(c) · none set · an offence
- A requirement of the reg 6 notice itself, so it binds the client that gives the notice; the regulation does not name who puts it up on site.
- It must be in a comprehensible form and periodically updated if necessary.
Before the notice
The notice names the principal designer and principal contractor, so the appointments come first. Where the client is domestic, the contractor gives the notice.
What this page is, and is not
It is the section text this library holds for England, from The Construction (Design and Management) Regulations 2015 (Great Britain), Housing Grants, Construction and Regeneration Act 1996, Part II (Construction Contracts) and The Scheme for Construction Contracts (England and Wales) Regulations 1998, as amended for England, with the window and the consequence. It is not legal advice, and it is not a substitute for reading the Regulations, the Act, the Scheme and the contract you signed.
Demiton does not yet track English projects. These pages set out the duties; the product does not run these checks on an English job today.
No library of law is complete, and Demiton never says this one is. An obligation the library does not hold, and you did not add, is not protected. You can add your own to any job.