diff --git a/backend/src/app.module.ts b/backend/src/app.module.ts
index 6d702176..1864f8e4 100644
--- a/backend/src/app.module.ts
+++ b/backend/src/app.module.ts
@@ -11,6 +11,7 @@ import { AppController } from './app.controller';
 import { AppService } from './app.service';
 import { UsersModule } from './users/users.module';
 import { AuthModule } from './auth/auth.module';
+import { AssetsExtendedModule } from './assets/assets-extended.module';
 import { AssetsOpsModule } from './assets/assets-ops.module';
 import { CheckinModule } from './checkin/checkin.module';
 import { AssetsModule } from './assets/assets.module';
@@ -64,6 +65,7 @@ import { CacheService } from './cache/cache.service';
       },
     }),
 
+    AssetsExtendedModule,
     AssetsOpsModule,
     CheckinModule,
     AssetsModule,
diff --git a/backend/src/assets/assets-extended.controller.ts b/backend/src/assets/assets-extended.controller.ts
new file mode 100644
index 00000000..e0ca0a47
--- /dev/null
+++ b/backend/src/assets/assets-extended.controller.ts
@@ -0,0 +1,56 @@
+import { Controller, Post, Get, Patch, Delete, Param, Body, Query, Req, UseGuards, UseInterceptors, UploadedFile } from '@nestjs/common';
+import { AuthGuard } from '@nestjs/passport';
+import { FileInterceptor } from '@nestjs/platform-express';
+import { AssetsExtendedService } from './assets-extended.service';
+import { TransferAssetDto } from './dtos/transfer-asset.dto';
+import { CreateMaintenanceDto } from './dtos/create-maintenance.dto';
+import { UpdateMaintenanceDto } from './dtos/update-maintenance.dto';
+import { HistoryQueryDto } from './dtos/history-query.dto';
+
+@Controller('assets')
+@UseGuards(AuthGuard('jwt'))
+export class AssetsExtendedController {
+  constructor(private readonly assetsExtendedService: AssetsExtendedService) {}
+
+  @Post(':id/transfer')
+  async transfer(@Param('id') id: string, @Body() dto: TransferAssetDto, @Req() req: any) {
+    return this.assetsExtendedService.transfer(id, dto, req.user?.id);
+  }
+
+  @Get(':id/history')
+  async getHistory(@Param('id') id: string, @Query() query: HistoryQueryDto) {
+    return this.assetsExtendedService.getHistory(id, query);
+  }
+
+  @Post(':id/documents')
+  @UseInterceptors(FileInterceptor('file'))
+  async uploadDocument(@Param('id') id: string, @UploadedFile() file: Express.Multer.File, @Req() req: any) {
+    return this.assetsExtendedService.addDocument(id, file, req.user?.id);
+  }
+
+  @Get(':id/documents')
+  async listDocuments(@Param('id') id: string) {
+    return this.assetsExtendedService.listDocuments(id);
+  }
+
+  @Delete(':id/documents/:documentId')
+  async deleteDocument(@Param('id') id: string, @Param('documentId') documentId: string) {
+    await this.assetsExtendedService.deleteDocument(id, documentId);
+    return { message: 'Document deleted' };
+  }
+
+  @Post(':id/maintenance')
+  async createMaintenance(@Param('id') id: string, @Body() dto: CreateMaintenanceDto, @Req() req: any) {
+    return this.assetsExtendedService.createMaintenance(id, dto, req.user?.id);
+  }
+
+  @Get(':id/maintenance')
+  async getMaintenanceRecords(@Param('id') id: string) {
+    return this.assetsExtendedService.getMaintenanceRecords(id);
+  }
+
+  @Patch(':id/maintenance/:recordId')
+  async updateMaintenance(@Param('id') id: string, @Param('recordId') recordId: string, @Body() dto: UpdateMaintenanceDto) {
+    return this.assetsExtendedService.updateMaintenance(id, recordId, dto);
+  }
+}
diff --git a/backend/src/assets/assets-extended.module.ts b/backend/src/assets/assets-extended.module.ts
new file mode 100644
index 00000000..a96f3fe4
--- /dev/null
+++ b/backend/src/assets/assets-extended.module.ts
@@ -0,0 +1,16 @@
+import { Module } from '@nestjs/common';
+import { TypeOrmModule } from '@nestjs/typeorm';
+import { Asset } from './entities/asset.entity';
+import { AssetHistory } from './entities/asset-history.entity';
+import { AssetDocument } from './entities/asset-document.entity';
+import { MaintenanceRecord } from './entities/maintenance-record.entity';
+import { AssetsExtendedService } from './assets-extended.service';
+import { AssetsExtendedController } from './assets-extended.controller';
+
+@Module({
+  imports: [TypeOrmModule.forFeature([Asset, AssetHistory, AssetDocument, MaintenanceRecord])],
+  controllers: [AssetsExtendedController],
+  providers: [AssetsExtendedService],
+  exports: [AssetsExtendedService],
+})
+export class AssetsExtendedModule {}
diff --git a/backend/src/assets/assets-extended.service.ts b/backend/src/assets/assets-extended.service.ts
new file mode 100644
index 00000000..4b5851b2
--- /dev/null
+++ b/backend/src/assets/assets-extended.service.ts
@@ -0,0 +1,147 @@
+import { Injectable, NotFoundException } from '@nestjs/common';
+import { InjectRepository } from '@nestjs/typeorm';
+import { Repository } from 'typeorm';
+import { Asset } from './entities/asset.entity';
+import { AssetHistory } from './entities/asset-history.entity';
+import { AssetDocument } from './entities/asset-document.entity';
+import { MaintenanceRecord } from './entities/maintenance-record.entity';
+import { TransferAssetDto } from './dtos/transfer-asset.dto';
+import { CreateMaintenanceDto } from './dtos/create-maintenance.dto';
+import { UpdateMaintenanceDto } from './dtos/update-maintenance.dto';
+import { HistoryQueryDto } from './dtos/history-query.dto';
+
+@Injectable()
+export class AssetsExtendedService {
+  constructor(
+    @InjectRepository(Asset)
+    private readonly assetRepository: Repository<Asset>,
+    @InjectRepository(AssetHistory)
+    private readonly historyRepository: Repository<AssetHistory>,
+    @InjectRepository(AssetDocument)
+    private readonly documentRepository: Repository<AssetDocument>,
+    @InjectRepository(MaintenanceRecord)
+    private readonly maintenanceRepository: Repository<MaintenanceRecord>,
+  ) {}
+
+  async transfer(id: string, dto: TransferAssetDto, userId?: string): Promise<Asset> {
+    const asset = await this.assetRepository.findOne({ where: { id }, relations: ['assignedTo'] });
+    if (!asset) throw new NotFoundException('Asset not found');
+
+    const previousValue: Record<string, unknown> = {
+      assignedToId: asset.assignedToId,
+      departmentId: asset.departmentId,
+      location: asset.location,
+    };
+    const newValue: Record<string, unknown> = { ...dto };
+
+    Object.assign(asset, dto);
+    asset.updatedById = userId;
+    await this.assetRepository.save(asset);
+
+    await this.historyRepository.save(
+      this.historyRepository.create({
+        assetId: id,
+        action: 'TRANSFERRED',
+        description: dto.notes || 'Asset transferred',
+        previousValue: previousValue as Record<string, unknown>,
+        newValue: newValue as Record<string, unknown>,
+        performedById: userId,
+      }),
+    );
+
+    return asset;
+  }
+
+  async getHistory(assetId: string, query: HistoryQueryDto) {
+    const qb = this.historyRepository.createQueryBuilder('h')
+      .leftJoinAndSelect('h.performedBy', 'performedBy')
+      .where('h.assetId = :assetId', { assetId })
+      .orderBy('h.createdAt', 'DESC');
+
+    if (query.action) qb.andWhere('h.action = :action', { action: query.action });
+    if (query.startDate) qb.andWhere('h.createdAt >= :startDate', { startDate: query.startDate });
+    if (query.endDate) qb.andWhere('h.createdAt <= :endDate', { endDate: query.endDate });
+    if (query.search) qb.andWhere('h.description ILIKE :search', { search: `%${query.search}%` });
+
+    return qb.getMany();
+  }
+
+  async addDocument(assetId: string, file: Express.Multer.File, userId?: string): Promise<AssetDocument> {
+    const asset = await this.assetRepository.findOne({ where: { id: assetId } });
+    if (!asset) throw new NotFoundException('Asset not found');
+
+    const doc = this.documentRepository.create({
+      assetId,
+      name: file.originalname,
+      type: file.mimetype,
+      url: '', // Will be set after S3 upload
+      s3Key: `${assetId}/${Date.now()}-${file.originalname}`,
+      size: file.size,
+      uploadedById: userId,
+    });
+    await this.documentRepository.save(doc);
+
+    await this.historyRepository.save(
+      this.historyRepository.create({
+        assetId,
+        action: 'DOCUMENT_UPLOADED',
+        description: `Document "${file.originalname}" uploaded`,
+        performedById: userId,
+      }),
+    );
+
+    return doc;
+  }
+
+  async listDocuments(assetId: string) {
+    return this.documentRepository.find({
+      where: { assetId },
+      relations: ['uploadedBy'],
+      order: { createdAt: 'DESC' },
+    });
+  }
+
+  async deleteDocument(assetId: string, documentId: string): Promise<void> {
+    const doc = await this.documentRepository.findOne({ where: { id: documentId, assetId } });
+    if (!doc) throw new NotFoundException('Document not found');
+    await this.documentRepository.remove(doc);
+  }
+
+  async createMaintenance(assetId: string, dto: CreateMaintenanceDto, userId?: string): Promise<MaintenanceRecord> {
+    const asset = await this.assetRepository.findOne({ where: { id: assetId } });
+    if (!asset) throw new NotFoundException('Asset not found');
+
+    const record = this.maintenanceRepository.create({
+      assetId,
+      ...dto,
+      performedById: userId,
+    });
+    await this.maintenanceRepository.save(record);
+
+    await this.historyRepository.save(
+      this.historyRepository.create({
+        assetId,
+        action: 'MAINTENANCE',
+        description: `Maintenance scheduled: ${dto.description}`,
+        performedById: userId,
+      }),
+    );
+
+    return record;
+  }
+
+  async getMaintenanceRecords(assetId: string) {
+    return this.maintenanceRepository.find({
+      where: { assetId },
+      relations: ['performedBy'],
+      order: { scheduledDate: 'DESC' },
+    });
+  }
+
+  async updateMaintenance(assetId: string, recordId: string, dto: UpdateMaintenanceDto): Promise<MaintenanceRecord> {
+    const record = await this.maintenanceRepository.findOne({ where: { id: recordId, assetId } });
+    if (!record) throw new NotFoundException('Maintenance record not found');
+    Object.assign(record, dto);
+    return this.maintenanceRepository.save(record);
+  }
+}
diff --git a/backend/src/assets/dtos/create-maintenance.dto.ts b/backend/src/assets/dtos/create-maintenance.dto.ts
new file mode 100644
index 00000000..561e2d34
--- /dev/null
+++ b/backend/src/assets/dtos/create-maintenance.dto.ts
@@ -0,0 +1,16 @@
+import { IsString, IsOptional, IsNumber } from 'class-validator';
+
+export class CreateMaintenanceDto {
+  @IsString()
+  type: string;
+
+  @IsString()
+  description: string;
+
+  @IsString()
+  scheduledDate: string;
+
+  @IsOptional()
+  @IsString()
+  notes?: string;
+}
diff --git a/backend/src/assets/dtos/history-query.dto.ts b/backend/src/assets/dtos/history-query.dto.ts
new file mode 100644
index 00000000..a281e7a7
--- /dev/null
+++ b/backend/src/assets/dtos/history-query.dto.ts
@@ -0,0 +1,19 @@
+import { IsOptional, IsString } from 'class-validator';
+
+export class HistoryQueryDto {
+  @IsOptional()
+  @IsString()
+  action?: string;
+
+  @IsOptional()
+  @IsString()
+  startDate?: string;
+
+  @IsOptional()
+  @IsString()
+  endDate?: string;
+
+  @IsOptional()
+  @IsString()
+  search?: string;
+}
diff --git a/backend/src/assets/dtos/transfer-asset.dto.ts b/backend/src/assets/dtos/transfer-asset.dto.ts
new file mode 100644
index 00000000..0e8b5c3a
--- /dev/null
+++ b/backend/src/assets/dtos/transfer-asset.dto.ts
@@ -0,0 +1,19 @@
+import { IsOptional, IsString } from 'class-validator';
+
+export class TransferAssetDto {
+  @IsOptional()
+  @IsString()
+  assignedToId?: string;
+
+  @IsOptional()
+  @IsString()
+  departmentId?: string;
+
+  @IsOptional()
+  @IsString()
+  location?: string;
+
+  @IsOptional()
+  @IsString()
+  notes?: string;
+}
diff --git a/backend/src/assets/dtos/update-maintenance.dto.ts b/backend/src/assets/dtos/update-maintenance.dto.ts
new file mode 100644
index 00000000..72b26d08
--- /dev/null
+++ b/backend/src/assets/dtos/update-maintenance.dto.ts
@@ -0,0 +1,23 @@
+import { IsOptional, IsString, IsNumber } from 'class-validator';
+
+export class UpdateMaintenanceDto {
+  @IsOptional()
+  @IsString()
+  status?: string;
+
+  @IsOptional()
+  @IsString()
+  completedDate?: string;
+
+  @IsOptional()
+  @IsNumber()
+  cost?: number;
+
+  @IsOptional()
+  @IsString()
+  notes?: string;
+
+  @IsOptional()
+  @IsString()
+  performedById?: string;
+}
diff --git a/backend/src/assets/entities/asset-document.entity.ts b/backend/src/assets/entities/asset-document.entity.ts
new file mode 100644
index 00000000..bed40bfd
--- /dev/null
+++ b/backend/src/assets/entities/asset-document.entity.ts
@@ -0,0 +1,41 @@
+import { Entity, PrimaryGeneratedColumn, Column, CreateDateColumn, ManyToOne, JoinColumn } from 'typeorm';
+import { Asset } from './asset.entity';
+import { User } from '../../users/entities/user.entity';
+
+@Entity('asset_documents')
+export class AssetDocument {
+  @PrimaryGeneratedColumn('uuid')
+  id: string;
+
+  @Column()
+  assetId: string;
+
+  @ManyToOne(() => Asset, { onDelete: 'CASCADE' })
+  @JoinColumn({ name: 'assetId' })
+  asset: Asset;
+
+  @Column()
+  name: string;
+
+  @Column()
+  type: string;
+
+  @Column()
+  url: string;
+
+  @Column({ nullable: true })
+  s3Key: string;
+
+  @Column({ type: 'int', nullable: true })
+  size: number;
+
+  @Column({ nullable: true })
+  uploadedById: string;
+
+  @ManyToOne(() => User, { nullable: true })
+  @JoinColumn({ name: 'uploadedById' })
+  uploadedBy: User;
+
+  @CreateDateColumn()
+  createdAt: Date;
+}
diff --git a/backend/src/assets/entities/asset-history.entity.ts b/backend/src/assets/entities/asset-history.entity.ts
new file mode 100644
index 00000000..4b2b53a6
--- /dev/null
+++ b/backend/src/assets/entities/asset-history.entity.ts
@@ -0,0 +1,38 @@
+import { Entity, PrimaryGeneratedColumn, Column, CreateDateColumn, ManyToOne, JoinColumn } from 'typeorm';
+import { Asset } from './asset.entity';
+import { User } from '../../users/entities/user.entity';
+
+@Entity('asset_history')
+export class AssetHistory {
+  @PrimaryGeneratedColumn('uuid')
+  id: string;
+
+  @Column()
+  assetId: string;
+
+  @ManyToOne(() => Asset, { onDelete: 'CASCADE' })
+  @JoinColumn({ name: 'assetId' })
+  asset: Asset;
+
+  @Column()
+  action: string;
+
+  @Column({ nullable: true, type: 'text' })
+  description: string;
+
+  @Column({ nullable: true, type: 'jsonb' })
+  previousValue: Record<string, unknown>;
+
+  @Column({ nullable: true, type: 'jsonb' })
+  newValue: Record<string, unknown>;
+
+  @Column({ nullable: true })
+  performedById: string;
+
+  @ManyToOne(() => User, { nullable: true })
+  @JoinColumn({ name: 'performedById' })
+  performedBy: User;
+
+  @CreateDateColumn()
+  createdAt: Date;
+}
diff --git a/backend/src/assets/entities/asset.entity.ts b/backend/src/assets/entities/asset.entity.ts
index e02f4c74..fd47905f 100644
--- a/backend/src/assets/entities/asset.entity.ts
+++ b/backend/src/assets/entities/asset.entity.ts
@@ -21,6 +21,18 @@ export class Asset {
   @Column({ nullable: true })
   serialNumber: string;
 
+  @Column({ nullable: true, type: 'date' })
+  purchaseDate: string;
+
+  @Column({ nullable: true, type: 'decimal', precision: 12, scale: 2 })
+  purchasePrice: number;
+
+  @Column({ nullable: true, type: 'decimal', precision: 12, scale: 2 })
+  currentValue: number;
+
+  @Column({ nullable: true, type: 'date' })
+  warrantyExpiration: string;
+
   @Column({ default: 'ACTIVE' })
   status: string;
 
@@ -36,6 +48,25 @@ export class Asset {
   @Column({ nullable: true })
   assignedToId: string;
 
+  @ManyToOne(() => User, { nullable: true })
+  @JoinColumn({ name: 'assignedToId' })
+  assignedTo: User;
+
+  @Column({ nullable: true, type: 'jsonb' })
+  imageUrls: string[];
+
+  @Column({ nullable: true, type: 'jsonb' })
+  customFields: Record<string, unknown>;
+
+  @Column({ nullable: true, type: 'jsonb' })
+  tags: string[];
+
+  @Column({ nullable: true })
+  manufacturer: string;
+
+  @Column({ nullable: true })
+  model: string;
+
   @Column({ nullable: true })
   barcode: string;
 
diff --git a/backend/src/assets/entities/maintenance-record.entity.ts b/backend/src/assets/entities/maintenance-record.entity.ts
new file mode 100644
index 00000000..1b552393
--- /dev/null
+++ b/backend/src/assets/entities/maintenance-record.entity.ts
@@ -0,0 +1,50 @@
+import { Entity, PrimaryGeneratedColumn, Column, CreateDateColumn, UpdateDateColumn, ManyToOne, JoinColumn } from 'typeorm';
+import { Asset } from './asset.entity';
+import { User } from '../../users/entities/user.entity';
+
+@Entity('maintenance_records')
+export class MaintenanceRecord {
+  @PrimaryGeneratedColumn('uuid')
+  id: string;
+
+  @Column()
+  assetId: string;
+
+  @ManyToOne(() => Asset, { onDelete: 'CASCADE' })
+  @JoinColumn({ name: 'assetId' })
+  asset: Asset;
+
+  @Column()
+  type: string;
+
+  @Column({ type: 'text' })
+  description: string;
+
+  @Column({ type: 'date' })
+  scheduledDate: string;
+
+  @Column({ type: 'date', nullable: true })
+  completedDate: string;
+
+  @Column({ type: 'decimal', precision: 12, scale: 2, nullable: true })
+  cost: number;
+
+  @Column({ nullable: true })
+  performedById: string;
+
+  @ManyToOne(() => User, { nullable: true })
+  @JoinColumn({ name: 'performedById' })
+  performedBy: User;
+
+  @Column({ nullable: true, type: 'text' })
+  notes: string;
+
+  @Column({ default: 'SCHEDULED' })
+  status: string;
+
+  @CreateDateColumn()
+  createdAt: Date;
+
+  @UpdateDateColumn()
+  updatedAt: Date;
+}