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	75.5 ft	-4°	246°	60.4 ft	Glass balustrade

The smallest thing that closes it

Add 0.4 ft 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.

Privacy 5 → 5View 46 → 24your land

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

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	Privacy after	View kept	Still sees in	Whose land
Add 0.4 ft 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.	63.1 ft	—	—	5	24	nobody	your land

No 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.