Grandmother's cottage was built towards the end of the 19th century for Rikard Kaarbø's mother, hence the name. It is a smaller house, typical of the Swiss style period. The house is one-and-a-half-storied with a steep pitched roof, and the plan is quadratic with a central chimney - a so-called central chimney house. The roof considerably protrudes from the wall and is supported by the nicely designed tie beams, while the gable boards on the gable ends terminate with saw-tooth mouldings. The entrance veranda that is enclosed with glass is particularly nicely designed - with many Swiss style details - and elsewhere the house has T-post windows.