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Have a look at slide and fold. They have standard sizes which are a bit cheaper, or fully custom. Mine were 2.2k for 3m.
Floor won't have any framing or joists as I have a concrete slab. I'm most likely going to be 50mm pir insulation directly onto the slab, then 18mm t&g chipboard and finally laminate or engineered oak.
I have more recently been thinking of ditching the insulation and screeding instead based on what some people say about the slab being a good temperature regulator.
Hovis
I'm pricing up bifolds for my office just now.
Ouch.
I'm looking at 3 panel, 2.2m wide x 2m high, with light reactive glass, coming in at ~2k (without cills and trickle vents at ~250 on top).