The scale of the building is 1/24. That is 1/2 inch equalling 1 foot. The dimensions are:-
Width - 11 inches
Depth - 10 inches
Height - 11 inches (up to the eves)
The Warhammer figures are built to 28mm scale which is smaller than 1/24 but as the House is already part built I have to keep to that scale.
Luckily my daughter is doing undead figures such as Vampires and Skeletons to go with it and they are a good size. The building would NOT work with the smaller figures such as gnomes.
Warhammers scale of 28mm is arbitrary and confusing as "28mm" could mean up to the eyes of the figure or to the top of any headwear - it is not explained. It is also not explained which figures are the 28mm "norm" from which the others are scaled. In consequence some of the figures do not even scale properly to each other or the commercial terrain and buildings. Just take a look at some of the Gametables in Games Workshop to see the mismatches.
So, in future, I will just have to adjust scale depending on which figures are going to be occupying the diorama.
Right - Off to bed to read some of my latest Simon Scarrow book and relax before putting in a few hours on the model tomorrow.
Mind those sharps objects and dont sniff the glue!