Upside down roller blind.

If it's normally going to be deployed, a simpler solution would be to mount it the normal orientation, but half way up the window. If it's normally going to be open you might find that intrusive.

-- Richard

Ah. Yes stairwells have tall bits...

Ok...

I am sure if you cant find the right bits, it will. Other options would include Venetian blinds - Assume the issue is to not frighten the horses when you stagger down butt naked for your 3.a.m cornflakes....

A normal roller blind with an extended pole at the free end and a couple of U shaped curtain pole supports would be simple enough

My biggest worry is the spring retraction. But that should be OK with

Talk it over with a blind making company.

Window film?

I've used some in the above-door lights - fake stained glass. Sounds a bit naff, well, it is, but look a lot nicer than what was there to my eye.

I'd disable the little ratchet things that lock the blind down when pulled down, so the blind is always under tension when installed upside down... Might be tricky to get the ratchet to unlock otherwise. Don't see why it shouldn't work!

Thomas Prufer

Remove any ratchet, fix blind at bottom of window, put a string from the centre up to a pulley (or use 2 and have the pull cord at one side) at the top of the window so you can raise/lower the blind. Use a small boat cleat

Instead of the boat cleat you could attach a weight to the string to simulate gravity pulling up, with the ratchet still in place.