On 25 April 2004, the first and second respondents (Mr Russell James Brown and Mr Joseph Sloep) were injured when a balcony collapsed at a birthday party at the house of the first appellant (Mr Pieter Andries Pienaar) in Green Point, Cape Town. Pienaar had employed Classen as the main building contractor. Classen, lacking expertise in steel construction, sub-contracted the design, manufacture and installation of the balcony to Lamberts. The balcony was a cantilevered half-moon shaped steel-framed structure approximately 3 metres long and over 1.5 metres wide. It was attached to the wall using coach screws 110 mm long that penetrated the wall to approximately 70 mm depth. At Pienaar's insistence, vertical support posts originally intended in the design were not installed, and a knee brace was used instead. No plans were submitted to or approved by the local authority as required by section 4(1) of the National Building Regulations and Building Standards Act 103 of 1977. The balcony collapsed when the screws fixing it to the wall pulled out, causing the plaintiffs to fall forward and sustain serious injuries.