diff --git a/src/controllers/bmdashboard/bmInventoryTypeController.js b/src/controllers/bmdashboard/bmInventoryTypeController.js
index d52ce6c77..86182d91d 100644
--- a/src/controllers/bmdashboard/bmInventoryTypeController.js
+++ b/src/controllers/bmdashboard/bmInventoryTypeController.js
@@ -8,7 +8,15 @@ const filepath = path.join(rootPath, filename);
 const { readFile } = fs;
 const { writeFile } = fs;
 
-function bmInventoryTypeController(InvType, MatType, ConsType, ReusType, ToolType, EquipType) {
+function bmInventoryTypeController(
+  InvType,
+  MatType,
+  ConsType,
+  ReusType,
+  ToolType,
+  EquipType,
+  invTypeHistory,
+) {
   async function fetchMaterialTypes(req, res) {
     try {
       MatType.find()
@@ -362,32 +370,95 @@ function bmInventoryTypeController(InvType, MatType, ConsType, ReusType, ToolTyp
   const updateNameAndUnit = async (req, res) => {
     try {
       const { invtypeId } = req.params;
-      const { name, unit } = req.body;
+      const {
+        name,
+        unit,
+        requestor: { requestorId },
+      } = req.body;
 
+      // 1. Fetch existing document
+      const invType = await MatType.findById(invtypeId);
+      if (!invType) {
+        return res.status(404).send('invType Material not found check Id');
+      }
+
+      // 2. Name uniqueness check
+      if (name && name !== invType.name) {
+        const existingInvType = await MatType.findOne({
+          name,
+          _id: { $ne: invtypeId },
+        });
+
+        if (existingInvType) {
+          return res.status(404).send('Material name already exists');
+        }
+      }
+
+      const historyDocs = [];
       const updateData = {};
 
-      if (name) {
+      // 3. Track name change
+      if (name && name !== invType.name) {
+        historyDocs.push({
+          invtypeId,
+          field: 'name',
+          oldValue: invType.name,
+          newValue: name,
+          editedBy: requestorId,
+        });
         updateData.name = name;
       }
 
-      if (unit) {
+      // 4. Track unit change
+      if (unit && unit !== invType.unit) {
+        historyDocs.push({
+          invtypeId,
+          field: 'unit',
+          oldValue: invType.unit,
+          newValue: unit,
+          editedBy: requestorId,
+        });
         updateData.unit = unit;
       }
 
-      const updatedInvType = await InvType.findByIdAndUpdate(invtypeId, updateData, {
+      // 5. Save history (if any)
+      if (historyDocs.length > 0) {
+        await invTypeHistory.insertMany(historyDocs);
+      }
+
+      // 6. Update main document
+      const updatedInvType = await MatType.findByIdAndUpdate(invtypeId, updateData, {
         new: true,
         runValidators: true,
       });
 
-      if (!updatedInvType) {
-        return res.status(404).json({ error: 'invType Material not found check Id' });
-      }
-
       res.status(200).json(updatedInvType);
     } catch (error) {
+      console.error(error);
       res.status(500).send(error);
     }
   };
+
+  const fetchInvTypeHistory = async (req, res) => {
+    try {
+      const { invtypeId } = req.params;
+
+      if (!invtypeId || !invtypeId.match(/^[0-9a-fA-F]{24}$/)) {
+        return res.status(400).json({ message: 'Invalid inventory type id' });
+      }
+
+      const history = await invTypeHistory
+        .find({ invtypeId })
+        .populate('editedBy', '_id firstName lastName email')
+        .sort({ editedAt: -1 })
+        .lean();
+
+      res.status(200).json(history);
+    } catch (error) {
+      console.error('Fetch history error:', error);
+      res.status(500).json({ message: 'Failed to fetch inventory history' });
+    }
+  };
   return {
     fetchMaterialTypes,
     fetchConsumableTypes,
@@ -402,6 +473,7 @@ function bmInventoryTypeController(InvType, MatType, ConsType, ReusType, ToolTyp
     addToolType,
     fetchInvUnitsFromJson,
     fetchInventoryByType,
+    fetchInvTypeHistory,
   };
 }
 
diff --git a/src/models/bmdashboard/buildingInventoryType.js b/src/models/bmdashboard/buildingInventoryType.js
index 7dcaa38dc..ff4a0298c 100644
--- a/src/models/bmdashboard/buildingInventoryType.js
+++ b/src/models/bmdashboard/buildingInventoryType.js
@@ -23,10 +23,13 @@ const invTypeBase = mongoose.model('invTypeBase', invTypeBaseSchema, 'buildingIn
 
 // ex: sand, stone, brick, lumber
 
-const materialType = invTypeBase.discriminator('material_type', new mongoose.Schema({
-  category: { type: String, enum: ['Material'] },
-  unit: { type: String, required: true }, // unit of measurement
-}));
+const materialType = invTypeBase.discriminator(
+  'material_type',
+  new mongoose.Schema({
+    category: { type: String, enum: ['Material'] },
+    unit: { type: String, required: true }, // unit of measurement
+  }),
+);
 
 //---------------------------
 // CONSUMABLE TYPE
@@ -34,11 +37,14 @@ const materialType = invTypeBase.discriminator('material_type', new mongoose.Sch
 
 // ex: screws, nails, staples
 
-const consumableType = invTypeBase.discriminator('consumable_type', new mongoose.Schema({
-  category: { type: String, enum: ['Consumable'] },
-  unit: { type: String, required: true },
-  size: { type: String, required: false },
-}));
+const consumableType = invTypeBase.discriminator(
+  'consumable_type',
+  new mongoose.Schema({
+    category: { type: String, enum: ['Consumable'] },
+    unit: { type: String, required: true },
+    size: { type: String, required: false },
+  }),
+);
 
 //---------------------------
 // REUSABLE TYPE
@@ -46,9 +52,12 @@ const consumableType = invTypeBase.discriminator('consumable_type', new mongoose
 
 // ex: gloves, brushes, hammers, screwdrivers
 
-const reusableType = invTypeBase.discriminator('reusable_type', new mongoose.Schema({
-  category: { type: String, enum: ['Reusable'] },
-}));
+const reusableType = invTypeBase.discriminator(
+  'reusable_type',
+  new mongoose.Schema({
+    category: { type: String, enum: ['Reusable'] },
+  }),
+);
 
 //---------------------------
 // TOOL TYPE
@@ -56,26 +65,29 @@ const reusableType = invTypeBase.discriminator('reusable_type', new mongoose.Sch
 
 // ex: shovels, wheelbarrows, power drills, jackhammers
 
-const toolType = invTypeBase.discriminator('tool_type', new mongoose.Schema({
-  category: { type: String, enum: ['Tool'] },
-  invoice: String,
-  purchaseRental: String,
-  fromDate: Date,
-  toDate:Date,
-  condition: String,
-  phoneNumber: String,
-  quantity: Number,
-  currency: String,
-  unitPrice: Number,
-  shippingFee: Number, 
-  taxes: Number, 
-  totalPriceWithShipping:  Number,
-  images: String,
-  link: String,
-
-  // isPowered: { type: Boolean, required: true },
-  // powerSource: { type: String, required: () => this.isPowered }, // required if isPowered = true (syntax?)
-}));
+const toolType = invTypeBase.discriminator(
+  'tool_type',
+  new mongoose.Schema({
+    category: { type: String, enum: ['Tool'] },
+    invoice: String,
+    purchaseRental: String,
+    fromDate: Date,
+    toDate: Date,
+    condition: String,
+    phoneNumber: String,
+    quantity: Number,
+    currency: String,
+    unitPrice: Number,
+    shippingFee: Number,
+    taxes: Number,
+    totalPriceWithShipping: Number,
+    images: String,
+    link: String,
+
+    // isPowered: { type: Boolean, required: true },
+    // powerSource: { type: String, required: () => this.isPowered }, // required if isPowered = true (syntax?)
+  }),
+);
 
 //---------------------------
 // EQUIPMENT TYPE
@@ -83,10 +95,49 @@ const toolType = invTypeBase.discriminator('tool_type', new mongoose.Schema({
 
 // ex: tractors, excavators
 
-const equipmentType = invTypeBase.discriminator('equipment_type', new mongoose.Schema({
-  category: { type: String, enum: ['Equipment'] },
-  fuelType: { type: String, enum: ['Diesel', 'Biodiesel', 'Gasoline', 'Natural Gas', 'Ethanol'], required: true },
-}));
+const equipmentType = invTypeBase.discriminator(
+  'equipment_type',
+  new mongoose.Schema({
+    category: { type: String, enum: ['Equipment'] },
+    fuelType: {
+      type: String,
+      enum: ['Diesel', 'Biodiesel', 'Gasoline', 'Natural Gas', 'Ethanol'],
+      required: true,
+    },
+  }),
+);
+/* =========================
+   INVENTORY TYPE HISTORY
+========================= */
+
+const invTypeHistorySchema = new Schema({
+  invtypeId: {
+    type: mongoose.Schema.Types.ObjectId,
+    ref: 'invTypeBase',
+    required: true,
+  },
+  field: {
+    type: String,
+    required: true,
+  },
+  oldValue: {
+    type: Schema.Types.Mixed,
+  },
+  newValue: {
+    type: Schema.Types.Mixed,
+  },
+  editedBy: {
+    type: mongoose.Schema.Types.ObjectId,
+    ref: 'userProfile',
+    required: true,
+  },
+  editedAt: {
+    type: Date,
+    default: Date.now,
+  },
+});
+
+const invTypeHistory = mongoose.model('invTypeHistory', invTypeHistorySchema);
 
 module.exports = {
   invTypeBase,
@@ -95,4 +146,5 @@ module.exports = {
   reusableType,
   toolType,
   equipmentType,
+  invTypeHistory,
 };
diff --git a/src/routes/bmdashboard/bmInventoryTypeRouter.js b/src/routes/bmdashboard/bmInventoryTypeRouter.js
index 2f57105e5..0d62c061c 100644
--- a/src/routes/bmdashboard/bmInventoryTypeRouter.js
+++ b/src/routes/bmdashboard/bmInventoryTypeRouter.js
@@ -1,6 +1,14 @@
 const express = require('express');
 
-const routes = function (baseInvType, matType, consType, reusType, toolType, equipType) {
+const routes = function (
+  baseInvType,
+  matType,
+  consType,
+  reusType,
+  toolType,
+  equipType,
+  invTypeHistory,
+) {
   const inventoryTypeRouter = express.Router();
   const controller = require('../../controllers/bmdashboard/bmInventoryTypeController')(
     baseInvType,
@@ -9,6 +17,7 @@ const routes = function (baseInvType, matType, consType, reusType, toolType, equ
     reusType,
     toolType,
     equipType,
+    invTypeHistory,
   );
 
   // Route for fetching all material types
@@ -40,6 +49,7 @@ const routes = function (baseInvType, matType, consType, reusType, toolType, equ
     .put(controller.updateNameAndUnit);
 
   inventoryTypeRouter.route('/inventoryUnits').get(controller.fetchInvUnitsFromJson);
+  inventoryTypeRouter.route('/invtypes/:invtypeId/history').get(controller.fetchInvTypeHistory);
 
   return inventoryTypeRouter;
 };
diff --git a/src/startup/routes.js b/src/startup/routes.js
index 71526e7a1..a78294e6c 100644
--- a/src/startup/routes.js
+++ b/src/startup/routes.js
@@ -73,6 +73,7 @@ const {
   reusableType,
   toolType,
   equipmentType,
+  invTypeHistory,
 } = require('../models/bmdashboard/buildingInventoryType');
 const {
   buildingConsumable,
@@ -211,6 +212,7 @@ const bmInventoryTypeRouter = require('../routes/bmdashboard/bmInventoryTypeRout
   reusableType,
   toolType,
   equipmentType,
+  invTypeHistory,
 );
 
 const toolAvailabilityRoutes = require('../routes/bmdashboard/bmToolAvailabilityRoutes');