Permit-To-Work aka PTW system is a used in a workplace and/or construction site to ensure that any high-risks works are being carried out with the acknowledgement of project manager and safety assessors. Below are the 7 kinds of general building / engineering related works that requires PTW in Singapore;


  1. Demolition work
  2. Excavation and trenching work in tunnel or hole in ground exceed depth of 1.5 metres.
  3. Lifting operations (Mobile Crane, Crawler Crane, Tower Cranes, etc.)
  4. Piling works
  5. Tunneling works
  6. Working on a scaffold where a person could fall more than 2 metres
  7. Working in confined space.

Any person carry out the high-risk work without permit-to-work issue by the project manager shall be guilty of an offence and liable to be fined not exceeding S$ 20,000.

Reference
Workplace Safety & Health (Construction) Regulations