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It's going to cost you more than a couple of grand - crane hire + road closure = pricey. Hammersmith and Fulham charge £2127, for example. Half decent bi-fold doors aren't cheap either. Our good quality but relatively budget bi-folds cost £2500.
I'm with you on the recycling bit. I don't actually think the neighbours would mind if it was done properly and fairly quickly, just don't think they'd be keen on an old shipping container rusting away at the bottom of the garden!
Angle grinder/plasma cutter, bi-fold doors, cover it in ivy and bob's yer uncle.
Genuine recyling and therefore more ecologically sound. As long as you give your neighbours plenty of warning, they won't moan.
All in for a couple of grand leaving more for bikes!