Hi Tones, I was thinking more about this.
Other people here can/ have answered your original question better than I can.
As far as council goes, if it’s just the mown strip at front between building and road, and you’re just wanting to plant flowers/ annuals/ smaller herbaceous plants without larger root systems and don’t pose any kind of hazard, Council are unlikely to bother much about it?
Yes, issues could be access to sewer, water and electrical, nbn etc underneath, power lines overhead, or affecting traffic visibility. Also removing any existing trees could be problematic (most councils have tree protection orders).
You can probably check councils land mapping on their website? Zoning and other layers. And talk to someone in the environment unit. Say you want to make a bird/ bee friendly garden , improve visual amenity, streetscape, inctease green space, contribute to cooling the urban environment – that sort of thing will tick boxes 🙂