What are general rules about front yards over there? Is it illegal to put up 2-3m high wall right at the sidewalk? Additionally you could add roof to extend rai

What are general rules about front yards over there? Is it illegal to put up 2-3m high wall right at the sidewalk? Additionally you could add roof to extend rainproof area. I wonder about this since I come from European country where front yards without fence are rarity, though at least it's not that bad as in China where you can't freely go in path/sidewalk between residential buildings because all are gated and fenced complexes so you are allowed to roam only official streets, it completely kills walkability.