Houses in fachwerk style are very common in eastern Germany:
I saw a lot of them when I used to visit with my ex-wife's family in Saxony. I have been reading that Gubaidulina tends to create a formal framework for her pieces using numerical proportions such as are found in the Fibonacci sequence so the title might refer to some sort of framework like that underlying the piece.
Here is the piece, written in 2009:
This piece is rather more tranquil than most of her other music.