Kolkata warehouse collapse: KMC report blames faulty design, substandard materials
Synopsis
A KMC investigation into the Taratala warehouse collapse has uncovered a cascade of violations — casting started from the third floor instead of the first, substandard materials used, and construction pushed five kathas beyond the sanctioned plan. Nine workers are dead, and the report's admission of chronic staff shortages in KMC's building supervision wing points to a systemic failure, not just a one-off lapse.
Key Takeaways
The KMC building department submitted a report to the KMC Commissioner on Thursday attributing the Taratala warehouse collapse to faulty design, substandard materials, and improper planning.
Iron casting was started from the third floor instead of the first, violating standard construction norms.
Construction was carried out on an extra five kathas of land beyond the sanctioned 43-katha plan.
Nine workers were killed and 20 others injured; two remain in critical condition at SSKM Hospital .
Five people have been arrested; an FIR has been filed under the Bharatiya Nyaya Sanhita (BNS) including culpable homicide charges.
A Special Investigation Team (SIT) has been formed by Kolkata Police to probe the incident.
A Kolkata Municipal Corporation (KMC) report submitted to the KMC Commissioner on Thursday has identified faulty construction design, substandard materials, and improper planning as the primary causes of the roof collapse at an under-construction warehouse in the Taratala area of Kolkata. The disaster claimed nine lives and left 20 workers injured, with two in critical condition.
What the KMC Report Found
According to the KMC building department's findings, the construction design had been approved for 43 out of 54 kathas of land in February 2025, following which a three-storey structure was erected. As per standard building norms, iron casting must begin from the first floor — but in this case, casting work was initiated from the third floor, placing a load the structure could not bear.
The report further noted that the materials used for casting were of low quality, and the base and lower sections of the structure were not adequately reinforced before upper floors were raised. The combination of these violations, according to the report, directly triggered the collapse on Thursday afternoon.
Illegal Construction Beyond Sanctioned Limits
Investigators have found that construction was being carried out on an extra five kathas of land beyond the sanctioned plan — meaning the builders had unlawfully expanded the warehouse beyond approved dimensions. The report clarified that the original construction design itself contained no error; the failures lay in execution and oversight.
The building department also acknowledged a systemic gap: insufficient staffing had hampered adequate supervision of construction activity at such sites, a concern that raises questions about broader enforcement capacity within KMC.
Casualties and Hospital Update
Nine workers were killed in the collapse, while 20 others sustained injuries. All injured workers have been admitted to SSKM Hospital for treatment. The condition of two patients remains critical, according to hospital officials.
Arrests and Police Action
Five individuals have so far been arrested in connection with the incident. The Kolkata Police registered a suo motu FIR under multiple sections of the Bharatiya Nyaya Sanhita (BNS), including culpable homicide and attempt to commit culpable homicide. A Special Investigation Team (SIT) has also been constituted to conduct a thorough probe into the collapse.
What Comes Next
The SIT investigation is expected to examine the roles of individual contractors, supervising engineers, and KMC officials. The acknowledgement of staff shortages in the KMC report may prompt calls for a wider audit of under-construction sites across the city. With five arrests already made and culpable homicide charges invoked, legal proceedings are likely to intensify in the coming weeks.
Point of View
But they target individuals after the fact. The harder question is whether KMC will act on its own finding of systemic supervisory gaps before the next under-construction site gives way. Five kathas of illegal construction proceeding undetected until a collapse is not a one-contractor problem; it is an enforcement problem.
NationPress
25 Jun 2026
Frequently Asked Questions
What caused the Taratala warehouse collapse in Kolkata?
According to a KMC building department report, the collapse was caused by faulty construction design, use of substandard materials, and improper planning. Critically, iron casting was begun from the third floor rather than the first, as required by norms, placing an unsustainable load on the structure.
How many people were killed or injured in the Kolkata warehouse collapse?
Nine workers were killed and 20 others were injured when the roof of the under-construction warehouse in Taratala collapsed on Thursday afternoon. All injured workers were admitted to SSKM Hospital, with two reported to be in critical condition.
Who has been arrested in the Kolkata warehouse collapse case?
Five people have been arrested so far in connection with the incident. Kolkata Police registered a suo motu FIR under multiple sections of the Bharatiya Nyaya Sanhita (BNS), including culpable homicide and attempt to commit culpable homicide.
What is the SIT formed by Kolkata Police investigating?
The Special Investigation Team (SIT) constituted by Kolkata Police is probing the full circumstances of the warehouse collapse, including the roles of contractors, engineers, and supervising officials. The investigation is also examining whether illegal construction beyond the sanctioned land area contributed to the disaster.
Was the original construction design approved by KMC at fault?
The KMC report stated that the original construction design contained no error. However, it flagged serious negligence in supervision by concerned officials and those involved in construction, as well as chronic staff shortages that hampered oversight of such building projects.
