This may better show the problem....look where the horizontal joists meet the house wall, the hatch pattern area is roughly where you would be cutting the joists to install a staircase.
![](https://www.diymyextension.co.uk/wp-content/uploads/2013/09/plans-cross-section-e1379193220442.jpg)
Those cut joists would be the floor of room 19, but when cut, how are you going to support them?
![](https://www.diymyextension.co.uk/wp-content/uploads/2013/09/plans-cross-section-e1379193220442.jpg)
Those cut joists would be the floor of room 19, but when cut, how are you going to support them?
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