When do subpanels solve cost and code issues better than a 200‑A service upgrade?
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If you need more circuits but your main panel still has room, a subpanel can save you money and the hassle of upgrading your whole electrical service.
Subpanels can be a cost-effective solution when you need to add new circuits: Subpanels allow you to add new circuits without overloading your main panel.
Sub panels are better when:
You need localized capacity without full service upgrade.
Existing service is near code max but load can be split.
Adding circuits to distant areas where long feeders would otherwise exceed breaker limits.
Cost of a full 200 A upgrade is high versus installing a sub panel and extending feeders.
Essentially: sub panels handle expansion cheaper and compliant, as long as total load stays within the main service rating.
Subpanels are best when total load is within limits but you need more circuits, better distribution, or remote panel placement avoiding a costly 200 A upgrade.
When load is modest but circuit space is short, or when adding circuits in a distant area avoids full 200-A upgrade cost and permits.
Subpanels can be a more cost-effective solution than a full 200-amp service upgrade in situations where only a specific area of a home needs additional power or when existing wiring is already sufficient for most of the house. If the existing 100-amp service can handle the majority of the house’s electrical needs, adding a subpanel to address a localized issue like a new workshop or addition can be significantly cheaper than upgrading the entire service