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 b616d094..897b999f 100644
--- a/src/main/java/com/interplug/qcast/biz/estimate/EstimateService.java
+++ b/src/main/java/com/interplug/qcast/biz/estimate/EstimateService.java
@@ -20,6 +20,12 @@ import com.interplug.qcast.biz.canvaspopupstatus.dto.CanvasPopupStatus;
 import com.interplug.qcast.biz.pwrGnrSimulation.dto.PwrGnrSimRoofResponse;
 import org.apache.commons.lang3.StringEscapeUtils;
 import org.apache.commons.lang3.StringUtils;
+import org.apache.poi.ss.usermodel.Cell;
+import org.apache.poi.ss.usermodel.CellStyle;
+import org.apache.poi.ss.usermodel.CellType;
+import org.apache.poi.ss.usermodel.DataFormat;
+import org.apache.poi.ss.usermodel.Row;
+import org.apache.poi.ss.usermodel.Sheet;
 import org.apache.poi.ss.usermodel.Workbook;
 import org.apache.poi.ss.usermodel.WorkbookFactory;
 import org.jsoup.nodes.Document;
@@ -1470,6 +1476,7 @@ public class EstimateService {
       this.selectTotalPriceInfo(estimateResponse, estimateItemList,
               estimateRequest.getSchUnitPriceFlg());
 
+      boolean isPdfDownload = "PDF".equals(estimateRequest.getSchDownload());
       int j = 1;
       for (ItemResponse itemResponse : estimateItemList) {
         itemResponse.setNo(String.valueOf(j++));
@@ -1499,13 +1506,15 @@ public class EstimateService {
           }
         }
 
-        // 문자열 통화로 변환 처리
-        itemResponse.setSalePrice(
-                String.format("%1$,.0f", Double.parseDouble(itemResponse.getSalePrice())));
-        itemResponse
-                .setAmount(String.format("%1$,.0f", Double.parseDouble(itemResponse.getAmount())));
-        itemResponse.setSaleTotPrice(
-                String.format("%1$,.0f", Double.parseDouble(itemResponse.getSaleTotPrice())));
+        // 문자열 통화로 변환 처리 (PDF 전용)
+        if (isPdfDownload) {
+          itemResponse.setSalePrice(
+                  String.format("%1$,.0f", Double.parseDouble(itemResponse.getSalePrice())));
+          itemResponse.setAmount(
+                  String.format("%1$,.0f", Double.parseDouble(itemResponse.getAmount())));
+          itemResponse.setSaleTotPrice(
+                  String.format("%1$,.0f", Double.parseDouble(itemResponse.getSaleTotPrice())));
+        }
 
         if ("YJSS".equals(estimateResponse.getEstimateType())
                 && (!StringUtils.isEmpty(itemResponse.getPaDispOrder())
@@ -1533,20 +1542,22 @@ public class EstimateService {
       estimateResponse.setPkgYn("YJSS".equals(estimateResponse.getEstimateType()) ? "Y" : "N");
       estimateResponse
               .setPkgNo("YJSS".equals(estimateResponse.getEstimateType()) ? String.valueOf(j++) : "");
-      if ("YJSS".equals(estimateResponse.getEstimateType())) {
-        estimateResponse
-                .setPkgAsp(String.format("%1$,.0f", Double.parseDouble(estimateResponse.getPkgAsp())));
+      if (isPdfDownload) {
+        if ("YJSS".equals(estimateResponse.getEstimateType())) {
+          estimateResponse.setPkgAsp(
+                  String.format("%1$,.0f", Double.parseDouble(estimateResponse.getPkgAsp())));
+        }
+        estimateResponse.setTotVol(
+                String.format("%1$,.0f", Double.parseDouble(estimateResponse.getTotVol())));
+        estimateResponse.setPkgTotPrice(
+                String.format("%1$,.0f", Double.parseDouble(estimateResponse.getPkgTotPrice())));
+        estimateResponse.setSupplyPrice(
+                String.format("%1$,.0f", Double.parseDouble(estimateResponse.getSupplyPrice())));
+        estimateResponse.setVatPrice(
+                String.format("%1$,.0f", Double.parseDouble(estimateResponse.getVatPrice())));
+        estimateResponse.setTotPrice(
+                String.format("%1$,.0f", Double.parseDouble(estimateResponse.getTotPrice())));
       }
-      estimateResponse
-              .setTotVol(String.format("%1$,.0f", Double.parseDouble(estimateResponse.getTotVol())));
-      estimateResponse.setPkgTotPrice(
-              String.format("%1$,.0f", Double.parseDouble(estimateResponse.getPkgTotPrice())));
-      estimateResponse.setSupplyPrice(
-              String.format("%1$,.0f", Double.parseDouble(estimateResponse.getSupplyPrice())));
-      estimateResponse.setVatPrice(
-              String.format("%1$,.0f", Double.parseDouble(estimateResponse.getVatPrice())));
-      estimateResponse.setTotPrice(
-              String.format("%1$,.0f", Double.parseDouble(estimateResponse.getTotPrice())));
 
       // 발전시뮬레이션 계산
       PwrGnrSimRequest pwrGnrSimRequest = new PwrGnrSimRequest();
@@ -1592,24 +1603,16 @@ public class EstimateService {
       String baseDrawingImgName = estimateRequest.getObjectNo() + "_" + estimateRequest.getPlanNo();
 
       URL url = new URL(drawingDirPath + File.separator + baseDrawingImgName + "_1.png");
-      URLConnection con = url.openConnection();
-      HttpURLConnection exitCode = (HttpURLConnection)con;
-      if (exitCode.getResponseCode() == 200) {
-        InputStream imageInputStream =
-                new URL(drawingDirPath + File.separator + baseDrawingImgName + "_1.png").openStream();
-        byte[] drawingImg1 = Util.toByteArray(imageInputStream);
+      byte[] drawingImg1 = loadDrawingImage(url);
+      if (drawingImg1 != null) {
         estimateResponse.setDrawingImg1(drawingImg1);
       }
       log.debug("url1 ::: {}", url);
 
       String baseDrawingImgName2 = estimateRequest.getObjectNo() + "_" + estimateRequest.getPlanNo();
       URL url2 = new URL(drawingDirPath + File.separator + baseDrawingImgName2 + "_2.png");
-      URLConnection con2 = url2.openConnection();
-      HttpURLConnection exitCode2 = (HttpURLConnection)con2;
-      if (exitCode2.getResponseCode() == 200) {
-        InputStream imageInputStream2 =
-                new URL(drawingDirPath + File.separator + baseDrawingImgName2 + "_2.png").openStream();
-        byte[] drawingImg2 = Util.toByteArray(imageInputStream2);
+      byte[] drawingImg2 = loadDrawingImage(url2);
+      if (drawingImg2 != null) {
         estimateResponse.setDrawingImg2(drawingImg2);
       }
       log.debug("url2 ::: {}", url2);
@@ -1807,9 +1810,18 @@ public class EstimateService {
       estimateResponse.setPcsList3(pcsList3);
 
         excelUtil = new ExcelUtil();
+        Map<String, Object> excelData = excelUtil.convertVoToMap(estimateResponse);
+        List<Map<String, Object>> excelList = excelUtil.convertListToMap(estimateItemList);
+        coerceExcelDataNumberFields(excelData);
+        coerceExcelItemNumberFields(excelList);
+        putExcelItemList(excelData, "itemList", estimateResponse.getItemList());
+        putExcelItemList(excelData, "estimateItemList15", estimateResponse.getEstimateItemList15());
+        putExcelItemList(excelData, "estimateItemListS15", estimateResponse.getEstimateItemListS15());
+        putExcelItemList(excelData, "circuitItemList11", estimateResponse.getCircuitItemList11());
+        putExcelRoofList(excelData, "roofModuleList8", estimateResponse.getRoofModuleList8());
+        putExcelRoofList(excelData, "pcsList3", estimateResponse.getPcsList3());
         byte[] excelBytes =
-                excelUtil.download(request, response, excelUtil.convertVoToMap(estimateResponse),
-                        excelUtil.convertListToMap(estimateItemList), excelTemplateNam);
+                excelUtil.download(request, response, excelData, excelList, excelTemplateNam);
 
         InputStream in = new ByteArrayInputStream(excelBytes);
         workbook = WorkbookFactory.create(in); // JXLS POI 엑셀로 재변환
@@ -1856,6 +1868,8 @@ public class EstimateService {
           safeRemoveSheet(workbook, "特異事項");
         }
 
+        applyExcelNumberFormat(workbook);
+
         ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
         workbook.write(byteArrayOutputStream);
         excelBytes = byteArrayOutputStream.toByteArray();
@@ -1964,6 +1978,150 @@ public class EstimateService {
     estimateResponse.setTotPrice(String.valueOf(totPrice.setScale(0, BigDecimal.ROUND_HALF_UP)));
   }
 
+  private static final Set<String> EXCEL_ITEM_NUMBER_FIELDS = new HashSet<>(
+          Arrays.asList("amount", "bomAmount", "salePrice", "unitPrice", "saleTotPrice", "grossWt", "pnowW"));
+
+  private static final Set<String> EXCEL_DATA_NUMBER_FIELDS = new HashSet<>(
+          Arrays.asList("pkgAsp", "totAmount", "totVol", "totVolKw", "pkgTotPrice",
+                  "supplyPrice", "vatPrice", "totPrice"));
+
+  private static final Set<String> EXCEL_ROOF_NUMBER_FIELDS = new HashSet<>(
+          Arrays.asList("amount", "totSpecification", "specification", "cnvEff",
+                  "amp", "tempLoss", "tempCoeff"));
+
+  private static void coerceExcelItemNumberFields(List<Map<String, Object>> list) {
+    if (list == null) {
+      return;
+    }
+    for (Map<String, Object> row : list) {
+      coerceExcelNumberFields(row, EXCEL_ITEM_NUMBER_FIELDS);
+    }
+  }
+
+  private static void coerceExcelDataNumberFields(Map<String, Object> map) {
+    coerceExcelNumberFields(map, EXCEL_DATA_NUMBER_FIELDS);
+  }
+
+  private static void coerceExcelRoofNumberFields(List<Map<String, Object>> list) {
+    if (list == null) {
+      return;
+    }
+    for (Map<String, Object> row : list) {
+      coerceExcelNumberFields(row, EXCEL_ROOF_NUMBER_FIELDS);
+    }
+  }
+
+  private static void coerceExcelNumberFields(Map<String, Object> map, Set<String> fields) {
+    if (map == null || fields == null) {
+      return;
+    }
+    for (String key : fields) {
+      if (!map.containsKey(key)) {
+        continue;
+      }
+      Object value = map.get(key);
+      Object parsed = parseExcelNumber(value);
+      map.put(key, parsed);
+    }
+  }
+
+  private static Object parseExcelNumber(Object value) {
+    if (value == null) {
+      return null;
+    }
+    if (value instanceof Number) {
+      return value;
+    }
+    if (!(value instanceof String)) {
+      return value;
+    }
+    String raw = ((String) value).trim();
+    if (raw.isEmpty()) {
+      return value;
+    }
+    String normalized = raw.replace(",", "");
+    if (!normalized.matches("[-+]?\\d+(\\.\\d+)?")) {
+      return value;
+    }
+    try {
+      return new BigDecimal(normalized);
+    } catch (NumberFormatException e) {
+      return value;
+    }
+  }
+
+  private static void putExcelItemList(Map<String, Object> excelData, String key,
+                                       List<ItemResponse> items) {
+    if (excelData == null || items == null) {
+      return;
+    }
+    List<Map<String, Object>> list = ExcelUtil.convertListToMap(items);
+    coerceExcelItemNumberFields(list);
+    excelData.put(key, list);
+  }
+
+  private static void putExcelRoofList(Map<String, Object> excelData, String key,
+                                       List<PwrGnrSimRoofResponse> items) {
+    if (excelData == null || items == null) {
+      return;
+    }
+    List<Map<String, Object>> list = ExcelUtil.convertListToMap(items);
+    coerceExcelRoofNumberFields(list);
+    excelData.put(key, list);
+  }
+
+  private static void applyExcelNumberFormat(Workbook workbook) {
+    if (workbook == null) {
+      return;
+    }
+    DataFormat dataFormat = workbook.createDataFormat();
+    short numberFormat = dataFormat.getFormat("#,##0.###");
+    Map<Short, CellStyle> styleCache = new HashMap<>();
+
+    for (int s = 0; s < workbook.getNumberOfSheets(); s++) {
+      Sheet sheet = workbook.getSheetAt(s);
+      if (sheet == null) {
+        continue;
+      }
+      for (Row row : sheet) {
+        for (Cell cell : row) {
+          CellType cellType = cell.getCellType();
+          CellStyle style = cell.getCellStyle();
+          boolean isTextFormat = style != null && "@".equals(style.getDataFormatString());
+
+          if (cellType == CellType.STRING) {
+            Object parsed = parseExcelNumber(cell.getStringCellValue());
+            if (parsed instanceof Number) {
+              cell.setCellValue(((Number) parsed).doubleValue());
+              cellType = CellType.NUMERIC;
+            } else {
+              continue;
+            }
+          }
+
+          if (cellType != CellType.NUMERIC) {
+            continue;
+          }
+
+          if (!isTextFormat) {
+            continue;
+          }
+
+          short styleIdx = style.getIndex();
+          CellStyle cached = styleCache.get(styleIdx);
+          if (cached == null) {
+            CellStyle newStyle = workbook.createCellStyle();
+            newStyle.cloneStyleFrom(style);
+            newStyle.setDataFormat(numberFormat);
+            styleCache.put(styleIdx, newStyle);
+            cached = newStyle;
+          }
+          cell.setCellStyle(cached);
+        }
+      }
+    }
+  }
+
   /**
    * QSP Q.CAST 견적서 전송 API
    *
@@ -2692,4 +2850,22 @@ public class EstimateService {
       workbook.removeSheetAt(sheetIndex);
     }
   }
+
+  private byte[] loadDrawingImage(URL url) {
+    try {
+      URLConnection connection = url.openConnection();
+      if (connection instanceof HttpURLConnection) {
+        HttpURLConnection httpConnection = (HttpURLConnection) connection;
+        if (httpConnection.getResponseCode() != HttpURLConnection.HTTP_OK) {
+          return null;
+        }
+      }
+      try (InputStream imageInputStream = connection.getInputStream()) {
+        return Util.toByteArray(imageInputStream);
+      }
+    } catch (Exception e) {
+      log.warn("Failed to load drawing image. url={}", url, e);
+      return null;
+    }
+  }
 }
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 ba435c89..44c1ae17 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