4S Application Guide

Complete guide for Smart Site Safety System Labelling Scheme

4S System Overview

Smart Site Safety System requirements for public works contracts exceeding HK$30 million

Identify if project is public works contract exceeding HK$30 million requiring 4S adoption

Determine appropriate 4S package (A-P) based on construction work type

Follow 4S Audit Checklist to assess compliance with technical circular requirements

4S Package Requirements Matrix

Recommended 4S packages by construction work type (R = Required, O = Optional)

Package	Work Type	Centralised	Digitalised	Digitalised	Hazardous	Mobile	Tower	Smart	AI	Confined	VR
A	Single-tower Building (superstructure construction)	O	R	R	R	O	R	O	-	-	-
B	Multiple-tower Building (superstructure construction)	O	O	R	R	R	R	R	R	O	O
C	Minor works /Repair (RMAA)	-	R	R	O	-	-	-	-	-	R
D	Ground Investigation	-	R	R	O	-	-	-	-	-	R
E	Building Demolition	-	R	R	R	R	-	-	-	-	O
F	Foundation	-	R	R	O	-	-	-	-	-	R
G	Site Formation	-	R	R	-	-	-	-	-	-	R
H	Site Formation, Large Scale	R	O	R	R	R	R	R	-	-	O
I	Flyover/ Carriageway/ Road Widening	R	O	R	R	R	R	-	-	-	O
J	Footbridge system (including lift installation)	-	O	R	R	-	-	-	-	-	O
K	Sewage/Water Treatment Works/ Stormwater Tank	R	O	R	R	R	O	R	R	R	O
L	Drainage/ Sewage Laying/ Utilities works	-	O	R	R	R	R	-	-	-	O
M	Port Works/ Pier/ Reclamation	-	O	O	R	R	R	R	-	-	O
N	Tunnelling	R	O	R	R	R	R	R	R	-	O
O	Landslip Prevention and Mitigation (LPM)	-	O	O	R	-	-	-	-	-	-
P	Confined Space	-	O	R	R	R	R	R	-	-	-

Required

Optional

-Not Applicable

Key Requirements

Important compliance requirements for 4S implementation