There are 11 different models, one and two story structures, and like all of my models, they are resin castings and come unpainted. The smallest, a stone shed measures about 5/8 of an inch square and just over a half inch tall. The largest house is just over 1 1/4 inches tall by an inch deep, and not quite 1 1/2inches tall.
Here are some pics of some painted buildings, raw resin, and with a with a Panther and Char B1-bis from C in C miniatures.
With C in C's 1/285 scale Panther and Char B1-bis for a bit of scale.