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The space between flights of stairs that is kinda like a tunnel of sorts. Or a shaft. Does it have a name? It needs a name. Maybe this should be posted on a architecture page.

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  • Lightwell if there is a roof window above,
    – Ian
    Commented Dec 1, 2018 at 17:05

2 Answers 2

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I think you are referring to stairwell:

a long, vertical passage through a building around which a set of stairs is built.

enter image description here

(Cambridge Dictionary)

The idea of “shaft” has been commonly referred to as “well” referring to stairs from about mid-1800.

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    This is not quite correct. A stairwell is bounded by the exterior of the stairs, not the interior; it includes the space taken by the stairs themselves. If there's another word for the interior space, I haven't been able to find it.
    – Xerxes
    Commented Dec 1, 2018 at 15:35
  • @Xerxes - it is still a stairwell. If you fall down a stairwell, that’s the shaft you are falling in.
    – user 66974
    Commented Dec 1, 2018 at 16:03
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    Not all stairwells have an open space like this. Sometimes there are flights in alternating directions with a very narrow gap between them, and sometimes that gap is filled by a wall. Still, I would probably use the word "stairwell" when describing the middle part of this picture.
    – David K
    Commented Dec 1, 2018 at 17:43
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The gap in the middle is called a "Well-hole".

a. An opening through a floor or series of floors, esp. one into which a staircase, chimney stack, etc., may be installed, or one which admits light
b. A central open space forming the vertical core around which the stairs of a winding or spiral staircase may be set.

OED

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    Your answer could be improved with additional supporting information. Please edit to add further details, such as citations or documentation, so that others can confirm that your answer is correct. You can find more information on how to write good answers in the help center.
    – Community Bot
    Commented Jan 12, 2023 at 16:07
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    I've added corroboration here. Richard: welcome to ELU. Please take a note of the help on good answers. It doesn't have to be OED: any reputable corroboration should be acceptable.
    – Andrew Leach
    Commented Jan 12, 2023 at 16:10

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