diff --git a/src/js/Control/Zoom.js b/src/js/Control/Zoom.js
index e0df8f6..e845420 100644
--- a/src/js/Control/Zoom.js
+++ b/src/js/Control/Zoom.js
@@ -175,24 +175,18 @@ BKGWebMap.Control.createZoom = function () {
         // Zoom to extent
         function zoomToExtent() {
             var extent = ol.extent.createEmpty();
+            var projection = map.getView().getProjection();
 
             map.getLayers().forEach(function (layer) {
-                if (layer instanceof ol.layer.Group) {
-                    layer.getLayers().forEach(function (groupLayer) {
-                        if (groupLayer instanceof ol.layer.Vector) {
-                            ol.extent.extend(extent, groupLayer.getSource().getExtent());
-                        } else if (layer.extent && layer.extent instanceof Array) {
-                            ol.extent.extend(extent, layer.extent);
-                        }
-                    });
-                } else if (layer instanceof ol.layer.Vector) {
-                    ol.extent.extend(extent, layer.getSource().getExtent());
-                } else if (layer.extent && layer.extent instanceof Array) {
-                    ol.extent.extend(extent, layer.extent);
-                }
+                var layerExtent = BKGWebMap.Util.getLayerExtent(layer, projection);
+                ol.extent.extend(extent, layerExtent);
             });
-            // TODO: doesn't work with different projections
-            map.getView().fit(extent, map.getSize());
+
+            // clip to projection extent?
+            extent = ol.extent.getIntersection(extent, projection.getExtent());
+
+            // TODO: check if configured view extent is respected.
+            map.getView().fit(extent);
         }
 
         // Activate history function
diff --git a/src/js/Util.js b/src/js/Util.js
index 8c9656a..59b3667 100644
--- a/src/js/Util.js
+++ b/src/js/Util.js
@@ -661,3 +661,41 @@ if (!('remove' in Element.prototype)) {
 
     window.CustomEvent = CustomEvent;
 }());
+
+
+/**
+ * Returns the extent of the given layer. Depending on the layer type the
+ * access to the extent may vary.
+ *
+ * @param {ol.layer.Layer} layer - the layer from which to retrieve the extent
+ * @param {ol.proj.Projection} projection - optional target projection for layer
+ * @returns {ol.Extent}
+ */
+BKGWebMap.Util.getLayerExtent = function (layer, projection) {
+    var extent;
+    if (layer instanceof ol.layer.Group) {
+        extent = ol.extent.createEmpty();
+        layer.getLayers().forEach(function (subLayer) {
+            var subLayerExtent = BKGWebMap.Util.getLayerExtent(subLayer, projection);
+            ol.extent.extend(extent, subLayerExtent);
+        });
+        return extent;
+    }
+
+    // layer has no source. e.g. EMPTY
+    if(layer.getSource() == null)
+       return ol.extent.createEmpty();
+
+    if (layer instanceof ol.layer.Vector) {
+        extent = layer.getSource().getExtent();
+    } else if (layer.extent && layer.extent instanceof Array) {
+        extent = layer.extent;
+    }
+
+    var srcProjection = layer.getSource().getProjection();
+    if (projection && srcProjection != null) {
+        extent = ol.proj.transformExtent(extent, srcProjection, projection);
+    }
+
+    return extent;
+};