The duties of a summer house sitter involve caring for a home or property while the homeowner is away for the summer season. Your responsibilities as a summer house sitter vary depending on the needs of the client, but in general, you stay in the home and perform tasks like collecting the mail, paying utility bills, caring for the lawn, and ensuring that the residence is secure. The homeowner gives the sitter accommodation on the property, and you live there full time during the summer. Additionally, you may care for pets who live at the house, but this is not as common.