Guides
Guides and explainers
Kodifly's guides explain the circulars, systems and site practices behind Hong Kong public works supervision, one question per page.
Guides and explainers
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Digital Works Supervision System (DWSS)
DEVB TC(W) No. 8/2025 explained
DEVB TC(W) No. 8/2025 in plain terms. Who must adopt the DWSS, the HK$30 million threshold, 1 April 2026, changes from TC(W) No. 2/2023, cost ceiling, EDMS and audit.
4 min read
Digital Works Supervision System (DWSS)
How to choose a DWSS
How to choose a DWSS for Hong Kong public works. Nine criteria from TC(W) No. 8/2025 Annex A, questions to ask any vendor, red flags, and how Kodifly answers each.
4 min read
Smart Site Safety (4S)
4S and DWSS integration: one hub for site safety data
How the 4S centralised management platform joins the DWSS Smart Construction Management hub under DEVB TC(W) Nos. 3/2023 and 8/2025, and what flows into it.
5 min read
Digital Works Supervision System (DWSS)
Digital Works Supervision System (DWSS) for HK$30m+ public works. All six Annex A modules, a 24-hour iCWP API and a tender checklist. Kodifly delivers it complete.
DEVB TC(W) No. 8/2025
DWSS cleansing inspection checklists module
What the DWSS Cleansing Inspection Checklists module must do under TC(W) No. 8/2025 Annex A: daily and weekly checklists, records, workflow, statistics and SpatialSense.
3 min readLast updated
DEVB TC(W) No. 8/2025
DWSS contract management module: NEC and Health Check data
What the DWSS Contract Management module must do under TC(W) No. 8/2025 Annex A: compensation events, early warnings, payment, programme, NEC Health Check data.
4 min readLast updated
DEVB TC(W) No. 8/2025
DWSS glossary: terms in TC(W) No. 8/2025
A sourced glossary of DWSS terms in Hong Kong public works: DWSS, iCWP, DSR, RISC, SCM, SDM, EDMS, SSSS or 4S, CSP, NEC and PTE, with the circular paragraph for each.
4 min readLast updated
DEVB TC(W) No. 8/2025
How to choose a DWSS
How to choose a DWSS for Hong Kong public works. Nine criteria from TC(W) No. 8/2025 Annex A, questions to ask any vendor, red flags, and how Kodifly answers each.
4 min readLast updated
DEVB TC(W) No. 8/2025
DWSS iCWP integration and the iCWP data standard
How a DWSS feeds DEVB's iCWP under TC(W) No. 8/2025. The data standardisation rule, the 24-hour API clause, what data flows and how SpatialSense meets it.
4 min readLast updated
DEVB TC(W) No. 8/2025
DWSS Labour Return module: G.F. 527
What the DWSS Labour Return module must do under TC(W) No. 8/2025 Annex A: every G.F. 527 field, retrieval from the Site Diary, workflow, statistics and SpatialSense.
3 min readLast updated
DEVB TC(W) No. 8/2025
DWSS RISC module: Request for Inspection / Survey Check
What the DWSS RISC module must do under TC(W) No. 8/2025 Annex A 7.5: form references, fields, workflow and sign-off, dashboard, and how SpatialSense delivers it.
4 min readLast updated
DEVB TC(W) No. 8/2025
DWSS Site Diary module: G.F. 536 and Site Record Book
What the DWSS Site Diary module must do under TC(W) No. 8/2025 Annex A 7.5: G.F. 536, Site Record Book, content, workflow, statistics, and how SpatialSense delivers it.
3 min readLast updated
DEVB TC(W) No. 8/2025
DWSS site safety inspection records module
What the DWSS Site Safety Inspection Records module must do under TC(W) No. 8/2025 Annex A: safety walks, performance records, workflow, statistics and SpatialSense.
3 min readLast updated
DEVB TC(W) No. 8/2025
DEVB TC(W) No. 8/2025 explained
DEVB TC(W) No. 8/2025 in plain terms. Who must adopt the DWSS, the HK$30 million threshold, 1 April 2026, changes from TC(W) No. 2/2023, cost ceiling, EDMS and audit.
4 min readLast updated
DEVB TC(W) No. 8/2025
DWSS tender requirements checklist
A clause-by-clause checklist of DEVB TC(W) No. 8/2025 Annex A for DWSS tenders: proposal contents, access, security, backup, availability, timeline, handover and AI.
4 min readLast updated
Co-supervision Platform
DEVB TC(W) 1/2026 Co-supervision Platform (SmartEye) for works above HK$400m. Kodifly supplies the 4D LiDAR, cameras and edge units on about 20 contracts.
DEVB TC(W) No. 1/2026
Co-supervision Platform projects in Hong Kong
Kodifly has fitted around 20 Hong Kong public works contracts with LiDAR, cameras and edge units for the Co-supervision Platform. Departments, scope and how we deploy.
4 min readLast updated
DEVB TC(W) No. 1/2026
Fixed-point vs fixed-route LiDAR for the Co-supervision Platform
TC(W) No. 1/2026 allows fixed-point LiDAR on poles or tower cranes and fixed-route LiDAR on drones or robots. When to use each, blind spots, and how Kodifly plans both.
5 min readLast updated
DEVB TC(W) No. 1/2026
Co-supervision Platform functions, and the site data behind each one
The nine Co-supervision Platform functions and four SmartEye technologies in TC(W) No. 1/2026 Annex A, the site data each needs, and how Kodifly supplies it.
6 min readLast updated
DEVB TC(W) No. 1/2026
TC(W) No. 1/2026: who must adopt the Co-supervision Platform, and how scope is vetted
TC(W) No. 1/2026 requires the Co-supervision Platform for capital works above HK$400 million tendered from 1 April 2026. Scope, vetting, exemptions and the DWSS link.
6 min readLast updated
DEVB TC(W) No. 1/2026
SmartEye compatible LiDAR, the capture the Co-supervision Platform reads
What capture data SmartEye, DEVB's Co-supervision Platform, needs under TC(W) No. 1/2026, and how Kodifly's LiDAR, cameras, sensors and edge units deliver it.
5 min readLast updated
Smart Site Safety (4S)
Smart Site Safety System (4S) for HK$30m+ public works, DEVB TC(W) 3/2023, the 4S labelling scheme, and one dashboard for wearables, AI cameras and permits.
DEVB TC(W) Nos. 3/2023 and 8/2025
4S and DWSS integration: one hub for site safety data
How the 4S centralised management platform joins the DWSS Smart Construction Management hub under DEVB TC(W) Nos. 3/2023 and 8/2025, and what flows into it.
5 min readLast updated
DEVB TC(W) No. 3/2023
AI cameras: the Safety Monitoring System using Artificial Intelligence
DEVB TC(W) No. 3/2023 clause 5(12)(g): the unsafe scenarios an AI camera must detect, the 80% test and 90% average accuracy, 1 second alarms and video records.
4 min readLast updated
DEVB TC(W) No. 3/2023
Centralised management platform (CMP) for the Smart Site Safety System
What DEVB TC(W) No. 3/2023 requires of the 4S centralised management platform (CMP): 30 users, 3 months of data, security, and the alerts every device sends it.
4 min readLast updated
DEVB TC(W) No. 3/2023
4S components: what a Smart Site Safety System must include
The twelve 4S components in DEVB TC(W) No. 3/2023 Annex A, what each must do, and the rules that apply to every device. Kodifly delivers the set complete.
5 min readLast updated
DEVB TC(W) No. 3/2023
Confined space monitoring system for the Smart Site Safety System
DEVB TC(W) No. 3/2023 clause 5(12)(h): worker counting, PPE checks and oxygen, gas and temperature monitoring for confined spaces under Cap. 59AE.
3 min readLast updated
DEVB TC(W) No. 3/2023
4S Labelling Scheme (4SLS): how a site earns a 4S label
How the CIC and DEVB 4S Labelling Scheme works: who applies, what CIC assesses, the site inspection, one-year validity, renewal and confiscation.
4 min readLast updated
DEVB TC(W) No. 3/2023
Mobile plant anti-collision: danger zone alert for excavators and cranes
DEVB TC(W) No. 3/2023 clause 5(12)(e): 360 degree sensors on excavators and cranes, a 2 m danger zone, 100 dB siren, and the BD mandatory rules for private works.
4 min readLast updated
DEVB TC(W) No. 3/2023
Digitised permit-to-work system for high-risk activities
What DEVB TC(W) No. 3/2023 clause 5(12)(c) requires of a digitised permit-to-work system: the high-risk activities, live mobile status and expiry alerts.
4 min readLast updated
DEVB TC(W) No. 3/2023
Digitised tracking of site plant, lifting gear and powered tools
DEVB TC(W) No. 3/2023 clause 5(12)(b): a unique digital ID on every plant, MEWP, lifting gear and powered tool, with scan checks and overdue alerts.
4 min readLast updated
DEVB TC(W) No. 3/2023
Smart locks for hazardous areas: electronic lock and key access control
DEVB TC(W) No. 3/2023 clause 5(12)(d): electronic locks and keys on electrical cabinets, floor openings, lift shafts and confined spaces, with siren and alerts.
4 min readLast updated
DEVB TC(W) No. 3/2023
Tower crane monitoring: lifting zone alert for people under the hook
DEVB TC(W) No. 3/2023 clause 5(12)(e): the tower crane loading and unloading danger zone of at least 7 m from the hook, 3 m clearance, 100 dB siren and alerts.
4 min readLast updated
DEVB TC(W) No. 3/2023
VR safety training for workers in high-risk activities
DEVB TC(W) No. 3/2023 clause 6: half-yearly VR safety training for workers in eight high-risk activities, accepted content, hardware and training records.
4 min readLast updated
DEVB TC(W) No. 3/2023
Smart monitoring devices for workers and frontline site personnel
DEVB TC(W) No. 3/2023 clause 5(12)(f): wearables for every worker with location, standstill, temperature and heart rate alerts, and privacy limits.
3 min readLast updated
Body-worn cameras (BWVC)
DEVB requires body-worn video cameras (BWVC) on public works inspections, announced 24 June 2026. Who wears them, plus Kodifly's 360 helmet camera and dated record.
Contract clause
BWVC contract specification: the items to check in your clause
DEVB publishes no body-worn camera specification. The items contracts commonly set, to check in your clause, and how the Kodifly helmet camera answers each.
4 min readLast updated
Personal Data (Privacy) Ordinance
Body-worn camera footage and the PDPO: the privacy rules for site inspections
Body-worn camera footage of identifiable people is personal data under the PDPO. PCPD guidance applied to site footage, with a policy checklist.
5 min readLast updated
DEVB body-worn camera requirement
Site inspection video record workflow: from start of shift to a retained record
A step-by-step site inspection video record workflow, from start of shift to retention. Footage is dated, placed on the floor plan and linked to DWSS records.
3 min readLast updated
LC Paper CB(1)749/2026(02)
Body-worn camera requirement on Hong Kong public works: who wears it, from when and why
DEVB has required body-worn video cameras on public works site inspections since June 2026. Who wears them, from when, why, and what your contract adds.
4 min readLast updated
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