diff --git a/squirrelbattle/interfaces.py b/squirrelbattle/interfaces.py
index 4e5f9ff..ad0e3b3 100644
--- a/squirrelbattle/interfaces.py
+++ b/squirrelbattle/interfaces.py
@@ -194,7 +194,7 @@ class Map:
             self.add_entity(dictclasses[entisave["type"]](**entisave))
 
     @staticmethod
-    def neighbourhood(grid, y, x, large=False):
+    def neighbourhood(grid, y, x, large=False, oob=False):
         """
         Returns up to 8 nearby coordinates, in a 3x3 square around the input coordinate if large is
         set to True, or in a 5-square cross by default. Does not return coordinates if they are out
@@ -203,12 +203,12 @@ class Map:
         height, width = len(grid), len(grid[0])
         neighbours = []
         if large:
-            dyxs = product([-1, 0, 1], [-1, 0, 1])
+            dyxs = [[dy, dx] for dy, dx in product([-1, 0, 1], [-1, 0, 1])]
             dyxs = dyxs[:5] + dyxs[6:]
         else:
             dyxs = [[0, -1], [0, 1], [-1, 0], [1, 0]]
         for dy, dx in dyxs:
-            if 0 <= y+dy < height and 0 <= x+dx < width:
+            if oob or (0 <= y+dy < height and 0 <= x+dx < width):
                 neighbours.append([y+dy, x+dx])
         return neighbours
 
diff --git a/squirrelbattle/mapgeneration/broguelike.py b/squirrelbattle/mapgeneration/broguelike.py
index b986b8f..96c7153 100644
--- a/squirrelbattle/mapgeneration/broguelike.py
+++ b/squirrelbattle/mapgeneration/broguelike.py
@@ -39,9 +39,16 @@ class Generator:
             for rx in range(rw):
                 if room[ry][rx] == Tile.FLOOR:
                     ly, lx = y + ry - door_y, x + rx - door_x
+                    # tile must be in bounds and empty
                     if not(0 <= ly < lh and 0 <= lx < lw) or \
                             level[ly][lx] == Tile.FLOOR:
                         return False
+                    # so do all neighbouring tiles bc we may
+                    # need to place walls there eventually
+                    for ny, nx in Map.neighbourhood(level, ly, lx, large=True, oob=True):
+                        if not(0 <= ny < lh and 0 <= nx < lw) or \
+                                level[ny][nx] != Tile.EMPTY:
+                            return False
         return True
 
     @staticmethod