>>844 Reasonable expectation of privacy applies in specific areas of your house, including bedrooms, bathrooms, changing rooms, etc. The rule of thumb is: it’s illegal to record a private conversation or a conversation you’re not a party to. This is called wiretapping in legalese.
However, this rule poses challenges regarding shared spaces or areas under surveillance. For instance, people sharing a house under surveillance cannot claim a reasonable expectation of privacy in court.