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For a CME to create a large enough electrostatic discharge, that would in turn start a fire, either your household would have to be close to one of the poles and/or the CME event would have to be near Carrington Event (http://cmeresearchinstitute.org/carrington-event/) size. We are fairly protected with our magnetosphere against the normal course of CMEs we see regurgitated by the sun. However, once in a great while, the sun emits a large enough CME that it would penetrate the Earth's magnetosphere (especially closer to the poles) where along conductive materials (i.e. electrical lines) electrostatic discharges would be created. This is why our electrical grid would be in peril, as the many miles of electrical lines would collect and concentrate these charges, causing overloading (and fires) at minor and major transformers. Presumably, the most likely candidate to catch fire inside a home would be one of your appliances, which would now receive too high of a jolt from the incoming electrical line. I would guess a toaster or microwave would be the first item to be set ablaze, since they are among the top five of appliances inciting house fires, when an apocalyptic CME is not involved.