Index: src/structures/ConstructionYardClass.cpp
===================================================================
--- src/structures/ConstructionYardClass.cpp	(wersja 113)
+++ src/structures/ConstructionYardClass.cpp	(kopia robocza)
@@ -43,7 +43,10 @@
 void ConstructionYardClass::checkSelectionList()
 {	//needed so selection list will have things in the right order when changed
 	BuilderClass::checkSelectionList();
-	
+
+	if(settings.techLevel>=2)
+		allowedToUpgrade = true;
+		
 	insertItem(Structure_Slab1);
 	if (settings.techLevel >= 4 && curUpgradeLev >= 1)
 		insertItem(Structure_Slab4);