Most Seattle homes built before 1985 are on original 100-amp service. That's fine for the appliance load of the 1970s — fridge, lights, gas furnace, gas range, gas dryer. It's NOT fine for a modern electrification stack: heat pump (40A), EV charger (50A), induction range (50A), heat pump water heater (30A). Add those up and you need 200A minimum.
The upgrade itself is a 1-day project. We pull the permit, coordinate Seattle City Light or PSE for the meter cut, swap the panel + meter base + main breaker, re-feed all the existing branch circuits, and schedule the city inspection for the same week.
Power is back the same day. You'll be without service for 4 to 6 hours during the active swap. We schedule the meter cut for early morning so you're back up by lunch.