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diff --git a/opendc-web/opendc-web-ui/src/components/app/map/layers/RoomHoverLayer.js b/opendc-web/opendc-web-ui/src/components/app/map/layers/RoomHoverLayer.js
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+/*
+ * Copyright (c) 2021 AtLarge Research
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+import React from 'react'
+import { useDispatch, useSelector } from 'react-redux'
+import { toggleTileAtLocation } from '../../../../redux/actions/topology/building'
+import RoomHoverLayerComponent from '../../../../components/app/map/layers/RoomHoverLayerComponent'
+import {
+    deriveValidNextTilePositions,
+    findPositionInPositions,
+    findPositionInRooms,
+} from '../../../../util/tile-calculations'
+
+const RoomHoverLayer = (props) => {
+    const dispatch = useDispatch()
+    const onClick = (x, y) => dispatch(toggleTileAtLocation(x, y))
+
+    const state = useSelector((state) => {
+        return {
+            mapPosition: state.map.position,
+            mapScale: state.map.scale,
+            isEnabled: () => state.construction.currentRoomInConstruction !== '-1',
+            isValid: (x, y) => {
+                const newRoom = Object.assign({}, state.objects.room[state.construction.currentRoomInConstruction])
+                const oldRooms = Object.keys(state.objects.room)
+                    .map((id) => Object.assign({}, state.objects.room[id]))
+                    .filter(
+                        (room) =>
+                            state.objects.topology[state.currentTopologyId].rooms.indexOf(room._id) !== -1 &&
+                            room._id !== state.construction.currentRoomInConstruction
+                    )
+
+                ;[...oldRooms, newRoom].forEach((room) => {
+                    room.tiles = room.tiles.map((tileId) => state.objects.tile[tileId])
+                })
+                if (newRoom.tiles.length === 0) {
+                    return findPositionInRooms(oldRooms, x, y) === -1
+                }
+
+                const validNextPositions = deriveValidNextTilePositions(oldRooms, newRoom.tiles)
+                return findPositionInPositions(validNextPositions, x, y) !== -1
+            },
+        }
+    })
+    return <RoomHoverLayerComponent onClick={onClick} {...props} {...state} />
+}
+
+export default RoomHoverLayer