If you have a glass railing, you can swap out the panels with frosted glass. This will increase privacy without compromising safety or changing the structure of your balcony. You may be able to add frosted window films over your panels, which can help you save money and time. Keep in mind that most frosted films are designed for interior windows. When you are shopping online, look for products that are specifically for exterior-facing patios. Do not adjust your films once you put them on, as many films rely on static cling to stay attached to your glass. 

Installing a balcony privacy fence is one of the most effective methods. You can use many types of fences or screens, and you should look at several products before making your decision. If you want maximum privacy, you should find a screen made of solid panels— mesh fences have openings that let in light and can leave residents feeling too exposed. 

The right curtains can also work as panels and fences. They allow air to circulate through patio or balcony space, while helping to control the temperatures. You can drape curtains around the perimeter of the balcony to enclose it completely for maximum privacy. You can also drape curtains down the centerline which allows you to close off one area and use it as an extra storage space. 

One of the more creative ways to ensure privacy is to strategically place tall and overflowing plants along the edges of your balcony or patio. Certain plants like ivy are extremely popular because they have thick leaves, tall vines, and striking colors. If you want something with flowers, you can grow hollyhocks. Hollyhocks can bring real vibrancy to your patio space, including shades of white, purple, and dark red. The plants are self-seeding perennials, so you can have new ones each year without ever having to replant.