bobble-
How was the external temp when you visited? That space looks difficult/impossible to heat with it open to the back unless they have done a lot of insulation, underfloor requires pretty low levels of heat loss to work, is my understanding, so maybe the glass is very good, but there is a lot of it. I'd be looking to reinstate the doors personally.
@damitamit guess they wanted a view out from the sink, but were too cheap to pony up for a new partition/window.
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Yep, not necessarily "full planning" permission if size and shape falls within permitted development rights. These are just rights that an owner has and you don't actually need a piece of paper although a certificate of lawful development confirms what had been built (or is proposed) meets the criteria - many don't bother.
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Polygon
Sheppz
If it's a "conservatory" it needs to be on a separate heating "loop" or whatever - and have doors to isolate it from the main house - this is to circumvent the heat/energy loss requirements of the building regs - but it needs to meet the building regs for glazing Uvalues and electrics.
If it's an "extension" with a glass roof and doors you need sap calcs to confirm the heat loss is within the regs and you need to meet all other building regs.
The size and scale of it probably is within permitted development rights tho