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diff --git a/bundles/org.simantics.simulator.toolkit.db/src/org/simantics/simulator/toolkit/db/StandardVariableManagerVariableBuilder.java b/bundles/org.simantics.simulator.toolkit.db/src/org/simantics/simulator/toolkit/db/StandardVariableManagerVariableBuilder.java
new file mode 100644
index 000000000..7699a24fe
--- /dev/null
+++ b/bundles/org.simantics.simulator.toolkit.db/src/org/simantics/simulator/toolkit/db/StandardVariableManagerVariableBuilder.java
@@ -0,0 +1,29 @@
+package org.simantics.simulator.toolkit.db;
+
+import org.simantics.db.ReadGraph;
+import org.simantics.db.exception.DatabaseException;
+import org.simantics.db.layer0.variable.NodeManagerVariableBuilder;
+import org.simantics.db.layer0.variable.NodeSupport;
+import org.simantics.simulator.toolkit.StandardNodeManager;
+
+public abstract class StandardVariableManagerVariableBuilder extends NodeManagerVariableBuilder {
+
+    @Override
+    protected Object getRoot(ReadGraph graph, NodeSupport<?> support, String sessionName) {
+        StandardNodeManager manager = (StandardNodeManager)support.manager;
+        return manager.getRoot();
+    }
+    
+    /*
+     * For compatibility reasons. Existing implementations implement getNodeSupport directly and in that case this is not needed.
+     * New implementations should not implement getNodeSupport but rather implement this.
+     */
+    protected StandardVariableSessionManager getSessionManager() {
+        throw new UnsupportedOperationException();
+    }
+    
+    protected NodeSupport<?> getNodeSupport(ReadGraph graph, String sessionName) throws DatabaseException {
+        return getSessionManager().getOrCreateNodeSupport(graph, sessionName);
+    }
+
+}