Can house improvement play a significant role in reducing malaria?

In many ways, this is what elininated malaria from the Tennessee Valley in the US, before the use of DDT or chloroquine, and in the midst of mosquito hordes generated by the TVA hydroelectric reservoirs. An advantage of making permanent improvements to a house - like closing the eaves and putting on screens - is that this increases the value of the house for the owner, whereas spraying or bednets have no lasting value.