I Want To Plant Quick Growing Tall Shrubs At The Bottom Of The Garden For Privacy And Security From Houses Being Built Behind

Question

The garden has a patio at the bottom ans a 6ft fence.

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Answer 1

You may want to try arborvitae, although they may grow taller and larger than you want.
https://www.gardeningknowhow.com/ornamental/shrubs/shgen/evergreen-shrubs-for-privacy.htm
https://www.gardeningknowhow.com/garden-how-to/gardening-by-zone/zone-8/zone-8-evergreen-trees.htm