It can be one circuit
A new appliance on an old run. A shared bathroom circuit. That is a repair or a new circuit, not a new box.
Panels / Tripping breakers
Why breakers trip after a kitchen or a garage.
The house did not suddenly get worse. You added load. The box stayed the same size.
A kitchen with more appliances, a garage with tools, or a charger on a panel that already felt tight will show up as a breaker that will not stay on. Sometimes that is one circuit. Sometimes the panel is out of spaces or out of amp. I look before we call it a replacement.
It can be the panel
No spaces left. The main is the size of a smaller house than the one you have now. That is when we talk 100-amp replacement or 200-amp.
Text the town, a photo of the panel door open, and what you added. I will tell you which conversation it is.
What the visit looks like · 100 vs 200 · Circuits and repairs
Text what started tripping.
Send the town, a photo of the panel door open, and a time that works.