Want to install a door in hallway entrance

My advice would be to forget both - especially the pocket - and to use cafe doors. They would afford privacy without enclosing the area.

buffalo ny: this door idea will encroach on the clearance for furniture and bed moving in/out and buying. it may block safe exiting from whatever pathway you interrupt with a door. if it's drafty, explore weatherstripping alternatives. if it's for noise, explore soundproofing alternatives. i see lots of hard surfaces including the existing doors walls and floors, so i will guess noise. how about some who/what/where/when/why/how, and we'll turn the door and carpenter money into interior wall insulation, carpeting, and sound deadening drapes. or maybe just some noise reducing headphones?

Why?

Privacy? Noise? Demarcation? Security?

I, personally, prefer a hanging-bead curtain like you see in Gypsy movies.

if that wall is a bearing wall. If it is, you would need a header. It also looks like there is some electrical that needs to be moved. Just that alone could be a huge project depending on where the wires run. Then for a 36" door, you have to make a 74" hole. Big project.

For a swing door. It should be hinged on the right side as you look at the photo(because of your light switches) and can either swing into the hall or out. 41" is tight, but a 36" door and trim will JUST BARELY fit. (won't be such an issue if you don't mind ripping your trim down) You should take your level and check for plumb, because if the hallway walls out of plumb by more than say 1/4", you would be better off with a 2'- 8" door.

I don't know about your specific situation, but I would guess that assuming those are bedrooms there, a hall door might be considered a hazard, blocking egress.

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=== A portiere?