diff --git a/src/c3nav/editor/static/editor/js/editor.js b/src/c3nav/editor/static/editor/js/editor.js
index 04497cc7..6f61cd97 100644
--- a/src/c3nav/editor/static/editor/js/editor.js
+++ b/src/c3nav/editor/static/editor/js/editor.js
@@ -158,7 +158,8 @@ editor = {
         'outside': '#EEFFEE',
         'obstacle': '#999999',
         'door': '#FF00FF',
-        'elevatorlevel': '#9EF8FB'
+        'hole': '#66CC66',
+        'elevatorlevel': '#9EF8FB',
     },
     _get_geometry_style: function (feature) {
         // style callback for GeoJSON loader
diff --git a/src/c3nav/mapdata/migrations/0008_hole.py b/src/c3nav/mapdata/migrations/0008_hole.py
new file mode 100644
index 00000000..b4c64962
--- /dev/null
+++ b/src/c3nav/mapdata/migrations/0008_hole.py
@@ -0,0 +1,32 @@
+# -*- coding: utf-8 -*-
+# Generated by Django 1.10.2 on 2016-11-28 22:05
+from __future__ import unicode_literals
+
+import c3nav.mapdata.fields
+from django.db import migrations, models
+import django.db.models.deletion
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('mapdata', '0007_auto_20161128_1903'),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='Hole',
+            fields=[
+                ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('name', models.SlugField(unique=True, verbose_name='Name')),
+                ('geometry', c3nav.mapdata.fields.GeometryField()),
+                ('level', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, related_name='holes', to='mapdata.Level', verbose_name='level')),
+                ('package', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, related_name='holes', to='mapdata.Package', verbose_name='map package')),
+            ],
+            options={
+                'default_related_name': 'holes',
+                'verbose_name': 'Hole',
+                'verbose_name_plural': 'Holes',
+            },
+        ),
+    ]
diff --git a/src/c3nav/mapdata/models/geometry.py b/src/c3nav/mapdata/models/geometry.py
index e1b3db68..5cf031a5 100644
--- a/src/c3nav/mapdata/models/geometry.py
+++ b/src/c3nav/mapdata/models/geometry.py
@@ -165,6 +165,18 @@ class Door(GeometryMapItem):
         default_related_name = 'doors'
 
 
+class Hole(GeometryMapItem):
+    """
+    A hole in the ground of a room, e.g. for stairs.
+    """
+    geomtype = 'polygon'
+
+    class Meta:
+        verbose_name = _('Hole')
+        verbose_name_plural = _('Holes')
+        default_related_name = 'holes'
+
+
 class ElevatorLevel(GeometryMapItem):
     """
     An elevator Level
diff --git a/src/c3nav/mapdata/models/level.py b/src/c3nav/mapdata/models/level.py
index f37e181f..63fc7396 100644
--- a/src/c3nav/mapdata/models/level.py
+++ b/src/c3nav/mapdata/models/level.py
@@ -57,7 +57,7 @@ class LevelGeometries():
 
     @cached_property
     def rooms(self):
-        return cascaded_union([room.geometry for room in self.level.rooms.all()])
+        return cascaded_union([room.geometry for room in self.level.rooms.all()]).intersection(self.buildings)
 
     @cached_property
     def outsides(self):
@@ -81,7 +81,15 @@ class LevelGeometries():
 
     @cached_property
     def areas(self):
-        return cascaded_union([self.rooms, self.outsides, self.elevatorlevels]).intersection(self.buildings)
+        return cascaded_union([self.rooms, self.outsides, self.elevatorlevels])
+
+    @cached_property
+    def holes(self):
+        return cascaded_union([holes.geometry for holes in self.level.holes.all()]).intersection(self.areas)
+
+    @cached_property
+    def buildings_with_holes(self):
+        return self.buildings.difference(self.holes)
 
     @cached_property
     def areas_and_doors(self):
@@ -89,15 +97,11 @@ class LevelGeometries():
 
     @cached_property
     def walls(self):
-        return self.buildings.difference(self.areas)
-
-    @cached_property
-    def walls_without_doors(self):
-        return self.walls.difference(self.areas_and_doors)
+        return self.buildings.difference(self.areas_and_doors)
 
     @cached_property
     def walls_shadow(self):
-        return self.walls_without_doors.buffer(0.2, join_style=JOIN_STYLE.mitre).intersection(self.buildings)
+        return self.walls.buffer(0.2, join_style=JOIN_STYLE.mitre).intersection(self.buildings_with_holes)
 
     @cached_property
     def doors(self):
diff --git a/src/c3nav/mapdata/packageio/const.py b/src/c3nav/mapdata/packageio/const.py
index 05297dee..13a779cb 100644
--- a/src/c3nav/mapdata/packageio/const.py
+++ b/src/c3nav/mapdata/packageio/const.py
@@ -1,6 +1,6 @@
 from c3nav.mapdata.models import Level, Package, Source
 from c3nav.mapdata.models.collections import Elevator
-from c3nav.mapdata.models.geometry import Building, Door, ElevatorLevel, Obstacle, Outside, Room
+from c3nav.mapdata.models.geometry import Building, Door, ElevatorLevel, Hole, Obstacle, Outside, Room
 
-ordered_models = (Package, Level, Source, Building, Room, Outside, Door, Obstacle)
+ordered_models = (Package, Level, Source, Building, Room, Outside, Door, Obstacle, Hole)
 ordered_models += (Elevator, ElevatorLevel)
diff --git a/src/c3nav/mapdata/render/renderer.py b/src/c3nav/mapdata/render/renderer.py
index 07f2172e..bfaf3bca 100644
--- a/src/c3nav/mapdata/render/renderer.py
+++ b/src/c3nav/mapdata/render/renderer.py
@@ -67,7 +67,7 @@ class LevelRenderer():
 
         contents.append(self.polygon_svg(box(0, 0, width, height), fill_color='#000000'))
 
-        contents.append(self.polygon_svg(self.level.geometries.buildings,
+        contents.append(self.polygon_svg(self.level.geometries.buildings_with_holes,
                                          fill_color='#D5D5D5'))
 
         contents.append(self.polygon_svg(self.level.geometries.outsides,
@@ -90,7 +90,7 @@ class LevelRenderer():
         contents.append(self.polygon_svg(self.level.geometries.elevatorlevels,
                                          fill_color='#9EF8FB'))
 
-        contents.append(self.polygon_svg(self.level.geometries.walls_without_doors,
+        contents.append(self.polygon_svg(self.level.geometries.walls,
                                          fill_color='#949494',
                                          stroke_color='#757575',
                                          stroke_width=3))