Plot for detached houses

In the real estate price statistics plots for detached houses or unbuilt plots for detached houses are defined on the basis of the land register with the following conditions: The purpose of use of the real estate is a residential building plot and it has no buildings. The real estate must neither be situated in a shore plan area. If the real estate is in a building plan or town plan area it is also required that the quality of the plan is residential detached area, the register has information about the permitted building volume and the building efficiency coefficient is under 0.5. In sparsely-populated areas the last condition cannot be checked because the quality of the plan and the permitted building volume have not been defined in the plan areas in question.