The balcony nobody uses

Who can see me, and what would stop them?

Privacy is a geometry problem with a view cost. The useful answer is the smallest thing that interrupts the specific line that bothers you.

The line

Every marked line into this seat is already interrupted. Privacy reads 5 out of 100 here, and nothing needs building.

Every marked observer and how open their line is.
Who	Line	Distance	Above the seat	Bearing	Barrier halfway	Interrupted by
The flat opposite	Blocked	75 ft	-4°	246°	60 ft	Glass balustrade

From the flat opposite, from the side

The line, from the side

To scale · to the measurements givenPlaced by the model

Eye to eye, at true scale. A screen near the seat can be short because the line is still low there; near the window it has to be tall.

The section, in a table

From the one chair, the line to the flat opposite is cut by glass balustrade.

Everything along the sightline, from the protected spot to the observer.
What	From the one chair	Height	The line
The one chair (eye)	0 in	63 ft	Starts here
Glass balustrade	7 ft 9 in	63 ft	Cuts it
Screen A	18 ft 10 in	62 ft	Just closes it
Screen B	38 ft	60 ft	Just closes it
Screen C	57 ft	59 ft	Just closes it
The flat opposite (eye)	75 ft	57 ft	Ends here

The smallest thing that closes it

Add 5 in to glass balustrade

Glass balustrade already sits on this line at 63 feet. Taking it to 63 feet closes the sightline without introducing a new object into the garden.

Line into the seat: 5% open → 5% openMarked view: 46% → 24% open · costs viewyour land

Sized against every marked observer. Nobody of any weight is left with a view in.

Line open: how much of each line of sight into the seat nothing blocks, weighted by how much you said each observer matters; 0% is unseen. Marked view open: how much of the view you marked is still clear from the seat. Both are read off the plan, so they are as good as the heights on it.

Test it before anybody builds it

The test: Hang a sheet or hold up a board about 63 ft high where the plan puts the screen, for two evenings at the hour that bothers you.
If it worked: Sitting at the one chair, you cannot see the flat opposite over it or round its ends.
If it didn’t: If you can still see the flat opposite over the top, it sits higher than the plan says; if you see it round an end, the zone is wider than drawn. Either way, nothing should be built to these numbers yet.
Next evidence: Photograph the view from the one chair with the sheet up, from the same spot both evenings, and measure how high the flat opposite actually is.

Buy nothing yetA sheet held where this would stand, for two evenings, before a single panel is bought.

Every position tested

Close to the seat means short and wide. Close to them means tall and narrow, and usually not your land.

What	Height	Width	Material	Line still open	Marked view open	Still sees in	Whose land
Add 5 in to glass balustrade Glass balustrade already sits on this line at 63 feet. Taking it to 63 feet closes the sightline without introducing a new object into the garden. A trellis or topper changes the wind load on a fence that was not designed for it.	63 ft	—	—	5%	24%	nobody	your land

NoteNo screen position along the line from The flat opposite works: every position that interrupts it needs more height or width than a screen has. The moves left on that side are distance, an overhead, or planting.