First of all, this is a term used and regulated by the TTB, the Alcohol and Tobacco Tax and Trade Bureau. Estate-bottled means that 100% of the wine came from grapes grown on land owned or controlled by the winery. Also, the vineyard must be located in a AVA desginated area, and both land and winery be on the same AVA area, as well.
Therefore, the winery must grow, crush, ferment, age, finish and bottle the wine in a continuous process on the same winery's premise.
In the Walla Walla area, a few estate-bottled wines to look for would be those from Leonetti, Woodward Canyon, L'Ecole #41, Pepper Bridge, Spring Valley, Tero Estates, Cadaretta, Dumas Station ... to name a few.
Besides, doesn't everyone that works in the Walla Walla wine industry live in an humble little home like the one in the photo?