<P> The original lead architect for the building, Nigel Whitbread, said in 2016 that the tower had been designed with attention to strength following the Ronan Point partial collapse of 1968 "and from what I can see could last another hundred years ." </P> <P> Grenfell Tower underwent a major renovation which was publicised in 2012 and completed in 2016 . Overseen by Studio E Architects, the £ 8,700,000 refurbishment was undertaken by Rydon Ltd of Forest Row, East Sussex, in conjunction with Artelia for contract administration and Max Fordham as specialist mechanical and electrical consultants . </P> <P> As part of the project, in 2015--2016, the concrete structure received new windows and new aluminium composite rainscreen cladding, in part to improve the appearance of the building . Two types were used: Arconic's Reynobond PE, which consists of two, coil - coated, aluminium sheets that are fusion bonded to both sides of a polyethylene core; and Reynolux aluminium sheets . Beneath these, and fixed to the outside of the walls of the flats, was Celotex RS5000 PIR thermal insulation . The work was carried out by Harley Facades of Crowborough, East Sussex, at a cost of £ 2.6 million . </P> <P> The original contractor, Leadbitter, had been dropped by KCTMO because their price of £ 11.278 million was £ 1.6 million higher than the proposed budget for the refurbishment . The contract was put out to competitive tender . Rydon's bid was £ 2.5 million less than Leadbitter's . An alternative cladding with better fire resistance was refused due to cost . </P>

When was the cladding put on grenfell tower