I seem to have 3 phases coming all the way to my board and then just a single phase meter. I’ve been quoted 1500 to upgrade my supply and a new meter. This means I could run a cable out to the garage and use 3 phase. The advantage I can see is that I already have a 3 (2)phase spot welder wrongly sold to me as single phase. And it seems like it gives me more options for compressors and welders. Is there a downside apart from the installation cost?