Stone Mansion Series Rear Extension Lean-to Double
Part of a set of components which may be assembled in all sorts of ways to create a wide variety of stone buildings ranging from simple farmhouses through posher urban terraces to more complex villas, hotels and even palatial manors. but without putting undue strain on system resources because the same basic units may be used again and again in various combinations.
Here's a lean-to for use with the double rear extension, shown in situ on the left and by itself in the foreground on the right.