[carpdad]

Double floor joist for the stairwell is load bearing, to a point. It is self supporting for the well/floor and light partition walls around/above it. Not if there is a middle of the house wall that supports the ceiling/floor joists of the space above (living space attic or second floor or roof rafters braced to it). If your house is average design, your metal i beam should be that. I think your plan works except the hole drilled through it for pvc pipe and maybe you can reinforce the spot with metal bracing. It is close to the foundation, but i don't know the rules for the load bearing beams.

S33021 - Jones Stephens S33021 - Single Stud Shoe, 18 Gauge, Box of 50 (Galvanized)

Jones Stephens S33021 - Single Stud Shoe, 18 Gauge, Box of 50 (Galvanized) - Jones Stephens S33 series single stud shoe with 18 ga thickness has 4 nail holes on each side to provide convenience usage to the user. Stud shoe has galvanized finish that provides protection against corrosion and...

www.supplyhouse.com

I'm sure it is sold in singles.

 

[carpdad]

Just fyi, if you raise the landing one riser and add couple more stairs, a turn, more landing space. What the headroom will allow, which is 6'8", i think, verify. I think the opening you have is enough for any small furniture or such. With me, it was the laundry basket, so landing wasn't as convenient as the wider feel turning space. If more stairs, you'll need to extend the handrail that turns down also. The handrail does not have to be one piece. Can be separate pieces but spaced no more than 1/4". In nj and passed the inspection with home made handrail. It just needs to be continuous.