diff --git a/src/main/java/com/interplug/qcast/biz/estimate/EstimateService.java b/src/main/java/com/interplug/qcast/biz/estimate/EstimateService.java
index 98b84969..0dd73a40 100644
--- a/src/main/java/com/interplug/qcast/biz/estimate/EstimateService.java
+++ b/src/main/java/com/interplug/qcast/biz/estimate/EstimateService.java
@@ -1747,32 +1747,39 @@ public class EstimateService {
         // SchDrawingFlg (1 : 견적서,2 : 발전시뮬레이션, 3 : 도면, 4 : 가대)
         // ex) 1|2|3|4
         if (!StringUtils.isEmpty(estimateRequest.getSchDrawingFlg())) {
+
           if (estimateRequest.getSchDrawingFlg().indexOf("1") < 0) {
-            workbook.removeSheetAt(workbook.getSheetIndex("見積書"));
-            workbook.removeSheetAt(workbook.getSheetIndex("特異事項"));
+            safeRemoveSheet(workbook, "見積書");
+            safeRemoveSheet(workbook, "特異事項");
+
           }
 
           if (estimateRequest.getSchDrawingFlg().indexOf("2") < 0) {
-            workbook.removeSheetAt(workbook.getSheetIndex("発電シミュレーション"));
+            safeRemoveSheet(workbook, "発電シミュレーション");
+
           }
 
           if (estimateRequest.getSchDrawingFlg().indexOf("3") < 0) {
-            workbook.removeSheetAt(workbook.getSheetIndex("割付図・系統図"));
-            workbook.removeSheetAt(workbook.getSheetIndex("架台図"));
+            safeRemoveSheet(workbook, "割付図・系統図");
+            safeRemoveSheet(workbook, "架台図");
+
           }
         }
 
         // 추후 개발 (가대중량표)
         if (estimateRequest.getSchDrawingFlg().indexOf("4") < 0) {
-          workbook.removeSheetAt(workbook.getSheetIndex("重量算"));
+          safeRemoveSheet(workbook, "重量算");
         }
 
         if ("EXCEL2".equals(estimateRequest.getSchDownload())) {
-          workbook.removeSheetAt(workbook.getSheetIndex("特異事項"));
-          workbook.removeSheetAt(workbook.getSheetIndex("発電シミュレーション"));
-          workbook.removeSheetAt(workbook.getSheetIndex("割付図・系統図"));
-          workbook.removeSheetAt(workbook.getSheetIndex("架台図"));
-          workbook.removeSheetAt(workbook.getSheetIndex("重量算"));
+          safeRemoveSheet(workbook, "見積書");
+          safeRemoveSheet(workbook, "特異事項");
+          safeRemoveSheet(workbook, "発電シミュレーション");
+          safeRemoveSheet(workbook, "割付図・系統図");
+          safeRemoveSheet(workbook, "架台図");
+          safeRemoveSheet(workbook, "重量算");
+        }else{
+          safeRemoveSheet(workbook,"見積書.");
         }
 
         ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
@@ -2573,4 +2580,18 @@ public class EstimateService {
 
 
   }
+
+  /**
+   * 워크북에서 시트를 안전하게 제거하는 헬퍼 메소드
+   * 시트가 존재하지 않으면 무시함
+   *
+   * @param workbook 워크북
+   * @param sheetName 제거할 시트명
+   */
+  private void safeRemoveSheet(Workbook workbook, String sheetName) {
+    int sheetIndex = workbook.getSheetIndex(sheetName);
+    if (sheetIndex >= 0) {
+      workbook.removeSheetAt(sheetIndex);
+    }
+  }
 }
diff --git a/src/main/resources/template/excel/excel_download_quotation_detail_template.xlsx b/src/main/resources/template/excel/excel_download_quotation_detail_template.xlsx
index 4e1ce477..76d3d2e4 100644
Binary files a/src/main/resources/template/excel/excel_download_quotation_detail_template.xlsx and b/src/main/resources/template/excel/excel_download_quotation_detail_template.xlsx differ