South Stand - lower part (the Leitch stand) bult in 1914, replacing the original Olive Grove stand which had been re-erected at Hillsborough in 1899. Grand Stand and rear facilities built in the mid 90s and new roof added. Technically not a rebuild but redeveloped beyond recognition.
The Kop - banked up gradually since we moved to Hillsborough, the bank reaching its maximum height by 1954. Extended and covered in 1986. Renovated and seated in 1993.
The North Stand - built in 1960/61, replacing the older North Stand which had been built c1900. Only renovations are adding the disabled area, widening the aisles and replacing wooden seats.
The West Stand - built in 1966, replacing an older covered terrace from 1928, which itself replaced an even older, smaller terrace from c1900. The current West Stand was essentially built over the top of the 1928 terrace (with the roof and rear section removed) and yes, the facilities and back wall from that terrace are still what form the concourse for the West Lower today. This is easy to spot and distinguish from the rest of the "new" West Stand if you've ever been on the West Lower. The Front part of the 1928 terrace was retained to form the lower terracing of the West Stand, which was of course closed in 1989 and renovated and reopened in 1991 with the seats.
The North West Corner - very simple, built in 1966 to join up the West and North Stands, replacing an older structure from 1919 which had done the same thing for the older North and Leppings Lane Ends. Renovated and seated in 1993. Mothballed and seats removed in 2021.
So the last new stand which was 100% built from scratch, with no traces of its predecessor, was the North Stand in 1961, 64 years ago.