The buildings, on Fulham Road, were reduced to rubble in January 2011 and neighbouring properties sustained serious structural damage.
Ethos Construction Solutions Limited, of Chesham, and sole director Pritish Lad, from Middlesex, were prosecuted by the Health and Safety Executive (HSE) after an investigation revealed a catalogue of serious issues.
Westminster Magistrates' Court heard that Ethos Construction, led by Mr Lad, was the principal contractor for a major project to renovate and refurbish a self-contained block of 14 buildings on Fulham Road to create 56 new apartments and 13 commercial units.
Numbers 270 and 280, adjoining properties, collapsed without warning on Sunday 23 January. The weekend timing meant there was no work activity and nobody was on site.
The fallen rubble and debris took several days to clear and Fulham Road was partially closed for several weeks while neighbouring buildings, some of which were left in a 'dangerous' state, were checked and made safe.
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A Prohibition Notice was put in place to stop the resumption of the renovation project until the site was declared as safe and stable.
HSE inspectors identified a number of safety failings in investigating the collapse. They included:
• Allowing existing structures to become weak and unstable. There was evidence of renovation activity within the collapsed buildings, including work on party walls and the demolition of rear extensions.
• Not assessing whether there was any evidence of a collapse risk.
• No temporary works plan for workers and no checks on whether workers were sufficiently trained and competent to undertake the work.
• The storage of large piles of bricks on several floors of still-standing buildings, which posed a potential over-loading risk.
• The poor installation and positioning of building props.
In addition, HSE also identified further issues elsewhere, including: an unsafe excavation up to three metres deep running the entire length of the development site; risks concerning working at height; fire risks because flammable materials were poorly stored and controlled; a failure to provide suitable emergency exits; insufficient fire detection and fire fighting equipment; and inadequate site security.
Two further Prohibition Notices were served to immediately stop unsafe activity.
Magistrates were told there was overwhelming evidence of dangerous working practices and poor planning and management, for which the principal contractor and director were ultimately responsible as duty holders.
Ethos Construction Solutions Limited, of High Street, Chesham, Bucks, was fined a total of £14,000 and ordered to pay a further £9,000 in costs after pleading guilty to six separate breaches of the Construction (Design and Management) Regulations 2007 and a single breach of Work at Height Regulations 2005.
Pritish Lad, 34, of The Avenue, Hatch End, Pinner, Middlesex, pleaded guilty to five separate breaches of the Construction (Design and Management) Regulations 2007 and the same Work at Height breach. He was fined a total of £9,500 with costs of £6,750.
(CD/MH)
