Home Outdoor Decking Balustrading required?

Balustrading required?

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Hello, I have a deck that is 800mm from the ground – so theoretically does not need balustrading. I want to put a fixed bench seat around the periphery – both for extra seating and as a physical barrier to prevent falling/tipping off deck.

This fixed seating would be 450mm from the deck floor ie 1250mm from ground height. I do not want to have to put a seat back on the bench seating.

Do I now need balustrading behind the bench seating to comply with building laws?

Thank you