diff --git a/src/services/guildService.ts b/src/services/guildService.ts
index 9c26c268..f258257e 100644
--- a/src/services/guildService.ts
+++ b/src/services/guildService.ts
@@ -170,7 +170,7 @@ export const getDojoClient = async (
                     }
                     if (newTier) {
                         logger.debug(`clan finished building barracks, updating to tier ${newTier}`);
-                        guild.Tier = newTier;
+                        setGuildTier(guild, newTier);
                         needSave = true;
                     }
                 }
@@ -248,16 +248,16 @@ export const removeDojoRoom = (guild: TGuildDatabaseDocument, componentId: Types
 
     switch (component.pf) {
         case "/Lotus/Levels/ClanDojo/ClanDojoBarracksShadow.level":
-            guild.Tier = 1;
+            setGuildTier(guild, 1);
             break;
         case "/Lotus/Levels/ClanDojo/ClanDojoBarracksStorm.level":
-            guild.Tier = 2;
+            setGuildTier(guild, 2);
             break;
         case "/Lotus/Levels/ClanDojo/ClanDojoBarracksMountain.level":
-            guild.Tier = 3;
+            setGuildTier(guild, 3);
             break;
         case "/Lotus/Levels/ClanDojo/ClanDojoBarracksMoon.level":
-            guild.Tier = 4;
+            setGuildTier(guild, 4);
             break;
     }
 };
@@ -402,3 +402,35 @@ export const removePigmentsFromGuildMembers = async (guildId: string | Types.Obj
         }
     }
 };
+
+const setGuildTier = (guild: TGuildDatabaseDocument, newTier: number): void => {
+    const oldTier = guild.Tier;
+    guild.Tier = newTier;
+    if (guild.TechProjects) {
+        for (const project of guild.TechProjects) {
+            const meta = ExportDojoRecipes.research[project.ItemType];
+
+            {
+                const numContributed = scaleRequiredCount(oldTier, meta.price) - project.ReqCredits;
+                project.ReqCredits = scaleRequiredCount(newTier, meta.price) - numContributed;
+                if (project.ReqCredits < 0) {
+                    guild.VaultRegularCredits ??= 0;
+                    guild.VaultRegularCredits += project.ReqCredits * -1;
+                    project.ReqCredits = 0;
+                }
+            }
+
+            for (let i = 0; i != project.ReqItems.length; ++i) {
+                const numContributed =
+                    scaleRequiredCount(oldTier, meta.ingredients[i].ItemCount) - project.ReqItems[i].ItemCount;
+                project.ReqItems[i].ItemCount =
+                    scaleRequiredCount(newTier, meta.ingredients[i].ItemCount) - numContributed;
+                if (project.ReqItems[i].ItemCount < 0) {
+                    project.ReqItems[i].ItemCount *= -1;
+                    addVaultMiscItems(guild, [project.ReqItems[i]]);
+                    project.ReqItems[i].ItemCount = 0;
+                }
+            }
+        }
+    }
+};