If the meter socket or the service entrance conductors are still 100-amp or 150-amp equipment, they have to be part of a 200-amp upgrade. A 200-amp-rated panel on a 100-amp meter is the mismatch electricians warn about. Whether your socket must be replaced is a fact about the existing equipment and the utility’s rules, not a universal yes, but you should assume it is in play until the electrician and the utility say otherwise.
Angi’s 2026 panel-upgrade article (updated 29 October 2026) quotes master electrician Salvatore Cutrona on this exact point: a new 200-amp-rated panel does not help if the exterior wire and meter box remain 100- or 150-amp equipment. Fixr also lists meter-box work as a separate cost item in its 2025 guide.
This is utility-coordinated work. Do not treat a panel-only invoice as a finished service upgrade. The calculator should be given the service rating you will actually have after the job, not the rating printed on a cabinet that has not been fully upgraded.
This is not a permit calculation, a utility approval, or a substitute for a licensed electrician, HVAC contractor, or the authority having jurisdiction. Panel Headroom is an independent educational site. It is not a utility, a certification body, or a contractor. Electrical and generator work that is done incorrectly can cause fire, shock, or carbon monoxide poisoning. Use the adopted electrical code and manufacturer instructions; pull permits where required.