These come as one of 4 shapes, all of which will fit together to make more complex buildings - ideal for Italian Wars, etc. All of the buildings come with doors and windows; at first I thought the patterns on the pieces were printed - but they are not, they are laser etched.
With some bits of balsa (chimney and balcony) and some Will's pantiles I knocked this one up as a tester. From memory, the smallest building is £1.50, the largest £3.50. The building below was made of a two storey section (£3.50) and a 'tower' (£2.50). At this price it is not worth the time and effort to cut out the pieces from scratch, especially the windows and shutters.