It's different depending on the line that runs to your home and the transformer serving your street. If the line to your home has enough diameter to carry 200A and the transformer and the main line have enough spare capacity, all it needs is to exchange the main fuses/circuit breakers on the utility side. Most new constructions these days are severely overbuilt to accomodate the rise in electric car chargers.

For older constructions however, it can be more involved - the line from the main line to your home might need an upgrade, the main line might need an upgrade or in the worst case the transformer might need an upgrade. The further up in the grid you go, the more expensive it gets for the utility - and some measures might even require significant work involving construction permits.