diff --git a/src/components/estimate/Estimate.jsx b/src/components/estimate/Estimate.jsx
index 7c7d4926..f3630069 100644
--- a/src/components/estimate/Estimate.jsx
+++ b/src/components/estimate/Estimate.jsx
@@ -1426,6 +1426,7 @@ export default function Estimate({}) {
                           <input
                             type="text"
                             className="input-light"
+                            maxLength={50 - 1 - (estimateContextState?.objectNameOmit?.length ?? 0)}
                             value={estimateContextState?.objectName || ''}
                             onBlur={handleBlurObjectName}
                             onChange={handleBlurObjectName}
diff --git a/src/components/estimate/popup/EstimateCopyPop.jsx b/src/components/estimate/popup/EstimateCopyPop.jsx
index 8a21f5c6..734b95da 100644
--- a/src/components/estimate/popup/EstimateCopyPop.jsx
+++ b/src/components/estimate/popup/EstimateCopyPop.jsx
@@ -127,7 +127,8 @@ export default function EstimateCopyPop({ planNo, setEstimateCopyPopupOpen }) {
 
   useEffect(() => {
     if (estimateContextState?.charger) {
-      setCopyReceiveUser(session?.userNm)
+      // [RECEIVEUSER-CLIP20 2026-05-18] T_PLAN.CHARGER nvarchar(20) — 21자+ session 값 클립
+      setCopyReceiveUser(session?.userNm?.slice(0, 20))
     }
   }, [estimateContextState?.charger])
 
@@ -311,7 +312,8 @@ export default function EstimateCopyPop({ planNo, setEstimateCopyPopupOpen }) {
                       type="text"
                       className="input-light"
                       required
-                      defaultValue={session?.userNm}
+                      maxLength={20}
+                      defaultValue={session?.userNm?.slice(0, 20)}
                       onChange={(e) => {
                         setCopyReceiveUser(e.target.value)
                       }}
diff --git a/src/components/management/StuffDetail.jsx b/src/components/management/StuffDetail.jsx
index e647cfb7..f5f906d5 100644
--- a/src/components/management/StuffDetail.jsx
+++ b/src/components/management/StuffDetail.jsx
@@ -64,7 +64,7 @@ export default function StuffDetail() {
   const formInitValue = {
     // 물건번호 T...(임시) S...(진짜)
     planReqNo: '', //설계의뢰No
-    receiveUser: session?.userNm, //담당자 로그인사용자명 디폴트
+    receiveUser: session?.userNm?.slice(0, 20), //담당자 로그인사용자명 디폴트 // [RECEIVEUSER-CLIP20 2026-05-18] DDL nvarchar(20) — 21자+ session 값 클립
     objectStatusId: '0', //물건구분(신축:0 기축 : 1)
     objectName: '', //물건명
     objectNameOmit: '', //경칭선택
@@ -637,7 +637,8 @@ export default function StuffDetail() {
           //설계의뢰No.
           form.setValue('planReqNo', managementState.planReqNo)
           //담당자
-          form.setValue('receiveUser', managementState.receiveUser)
+          // [RECEIVEUSER-CLIP20 2026-05-18] DDL nvarchar(20) — 기 저장된 21자+ 값 클립
+          form.setValue('receiveUser', managementState.receiveUser?.slice(0, 20))
 
           //물건구분objectStatusId
           setSelectObjectStatusId(managementState.objectStatusId)
@@ -1123,6 +1124,9 @@ export default function StuffDetail() {
   const _receiveUser = watch('receiveUser')
   //objectName: '', //물건명
   const _objectName = watch('objectName')
+  // [NVARCHAR50-GUARD 2026-05-18] ADDRESSEE_COMPANY_NAME(nvarchar(50)) = objectName + ' ' + objectNameOmit 합산 maxLength
+  const _objectNameOmit = watch('objectNameOmit')
+  const objectNameMaxLength = Math.max(0, 50 - 1 - (_objectNameOmit?.length ?? 0))
   // saleStoreId: '', //1차 판매점ID
   const _saleStoreId = watch('saleStoreId')
   // 2차 판매점명
@@ -1359,6 +1363,11 @@ export default function StuffDetail() {
       return swalFire({ text: getMessage('stuff.detail.save.valierror3', [errors]), type: 'alert', icon: 'warning' })
     }
 
+    // [NVARCHAR50-GUARD 2026-05-18] ADDRESSEE_COMPANY_NAME = objectName + ' ' + objectNameOmit (nvarchar(50)) 합산 가드
+    if (formData.objectName && (formData.objectName + ' ' + (formData.objectNameOmit ?? '')).length > 50) {
+      return swalFire({ text: getMessage('stuff.detail.save.objectNameTooLong'), type: 'alert', icon: 'warning' })
+    }
+
     const apiUrl = '/api/object/save-object'
 
     const params = {
@@ -1595,6 +1604,11 @@ export default function StuffDetail() {
       }
     }
 
+    // [NVARCHAR50-GUARD 2026-05-18] ADDRESSEE_COMPANY_NAME = objectName + ' ' + objectNameOmit (nvarchar(50)) 합산 가드
+    if (params.objectName && (params.objectName + ' ' + (params.objectNameOmit ?? '')).length > 50) {
+      return swalFire({ text: getMessage('stuff.detail.save.objectNameTooLong'), type: 'alert', icon: 'warning' })
+    }
+
     const apiUrl = '/api/object/save-object'
     if (objectNo) {
       setIsGlobalLoading(true)
@@ -1866,7 +1880,7 @@ export default function StuffDetail() {
                     </th>
                     <td>
                       <div className="input-wrap" style={{ width: '500px' }}>
-                        <input type="text" className="input-light" {...form.register('receiveUser')} />
+                        <input type="text" className="input-light" maxLength={20} {...form.register('receiveUser')} />
                       </div>
                     </td>
                   </tr>
@@ -1895,7 +1909,7 @@ export default function StuffDetail() {
                         })}
                         {/* 라디오끝 */}
                         <div className="input-wrap mr5" style={{ width: '545px' }}>
-                          <input type="text" className="input-light" maxLength={50} {...form.register('objectName')} />
+                          <input type="text" className="input-light" maxLength={objectNameMaxLength} {...form.register('objectName')} />
                         </div>
                         <div className="select-wrap" style={{ width: '120px' }}>
                           <Select
@@ -1923,7 +1937,7 @@ export default function StuffDetail() {
                     <th>{getMessage('stuff.detail.objectNameKana')}</th>
                     <td>
                       <div className="input-wrap" style={{ width: '789px' }}>
-                        <input type="text" className="input-light" {...form.register('objectNameKana')} />
+                        <input type="text" className="input-light" maxLength={50} {...form.register('objectNameKana')} />
                       </div>
                     </td>
                   </tr>
@@ -2136,7 +2150,7 @@ export default function StuffDetail() {
                           )}
                         </div>
                         <div className="input-wrap mr5" style={{ width: '580px' }}>
-                          <input type="text" className="input-light" value={form.watch('address') || ''} {...form.register('address')} />
+                          <input type="text" className="input-light" maxLength={255} value={form.watch('address') || ''} {...form.register('address')} />
                         </div>
                       </div>
                     </td>
@@ -2323,7 +2337,7 @@ export default function StuffDetail() {
                     <th>{getMessage('stuff.detail.remarks')}</th>
                     <td>
                       <div className="input-wrap">
-                        <input type="text" className="input-light" {...form.register('remarks')} />
+                        <input type="text" className="input-light" maxLength={500} {...form.register('remarks')} />
                       </div>
                     </td>
                   </tr>
@@ -2458,7 +2472,7 @@ export default function StuffDetail() {
                         </th>
                         <td>
                           <div className="input-wrap" style={{ width: '500px' }}>
-                            <input type="text" className="input-light" {...form.register('receiveUser')} value={form.watch('receiveUser') || ''} />
+                            <input type="text" className="input-light" maxLength={20} {...form.register('receiveUser')} value={form.watch('receiveUser') || ''} />
                           </div>
                         </td>
                       </tr>
@@ -2487,7 +2501,7 @@ export default function StuffDetail() {
                             })}
                             {/* 상세라디오끝 */}
                             <div className="input-wrap mr5" style={{ width: '545px' }}>
-                              <input type="text" className="input-light" maxLength={50} {...form.register('objectName')} />
+                              <input type="text" className="input-light" maxLength={objectNameMaxLength} {...form.register('objectName')} />
                             </div>
                             <div className="select-wrap" style={{ width: '120px' }}>
                               <Select
@@ -2515,7 +2529,7 @@ export default function StuffDetail() {
                         <th>{getMessage('stuff.detail.objectNameKana')}</th>
                         <td>
                           <div className="input-wrap" style={{ width: '789px' }}>
-                            <input type="text" className="input-light" {...form.register('objectNameKana')} />
+                            <input type="text" className="input-light" maxLength={50} {...form.register('objectNameKana')} />
                           </div>
                         </td>
                       </tr>
@@ -2737,7 +2751,7 @@ export default function StuffDetail() {
                               )}
                             </div>
                             <div className="input-wrap mr5" style={{ width: '580px' }}>
-                              <input type="text" className="input-light" value={form.watch('address') || ''} {...form.register('address')} />
+                              <input type="text" className="input-light" maxLength={255} value={form.watch('address') || ''} {...form.register('address')} />
                             </div>
                           </div>
                         </td>
@@ -2938,7 +2952,7 @@ export default function StuffDetail() {
                         <th>{getMessage('stuff.detail.remarks')}</th>
                         <td>
                           <div className="input-wrap">
-                            <input type="text" className="input-light" {...form.register('remarks')} value={form.watch('remarks') || ''} />
+                            <input type="text" className="input-light" maxLength={500} {...form.register('remarks')} value={form.watch('remarks') || ''} />
                           </div>
                         </td>
                       </tr>
diff --git a/src/hooks/floorPlan/estimate/useEstimateController.js b/src/hooks/floorPlan/estimate/useEstimateController.js
index b46d21ed..3f7120d8 100644
--- a/src/hooks/floorPlan/estimate/useEstimateController.js
+++ b/src/hooks/floorPlan/estimate/useEstimateController.js
@@ -207,6 +207,13 @@ export const useEstimateController = (planNo, flag) => {
       return swalFire({ text: getMessage('estimate.detail.save.requiredObjectName'), type: 'alert', icon: 'warning' })
     }
 
+    // [NVARCHAR50-GUARD 2026-05-18] ADDRESSEE_COMPANY_NAME = objectName + ' ' + objectNameOmit (nvarchar(50)) 합산 가드
+    if ((estimateData.objectName + ' ' + (estimateData.objectNameOmit ?? '')).length > 50) {
+      flag = false
+      setIsGlobalLoading(false)
+      return swalFire({ text: getMessage('estimate.detail.save.objectNameTooLong'), type: 'alert', icon: 'warning' })
+    }
+
     if (isNaN(Date.parse(estimateData.estimateDate))) {
       flag = false
       setIsGlobalLoading(false)
diff --git a/src/locales/ja.json b/src/locales/ja.json
index 2bc8f273..ba535999 100644
--- a/src/locales/ja.json
+++ b/src/locales/ja.json
@@ -801,6 +801,7 @@
   "stuff.detail.save.valierror2": "設置高さ0より大きい値を入力してください",
   "stuff.detail.save.valierror3": "{0} 必須入力項目です。",
   "stuff.detail.save.valierror4": "二次販売店名は必須オプションです。",
+  "stuff.detail.save.objectNameTooLong": "物件名（敬称含む）は50文字以内で入力してください。",
   "stuff.detail.move.confirmMsg": "商品情報画面に移動します。 [保存]していない図面情報は削除されます。商品情報画面に移動しますか？",
   "stuff.planReqPopup.popTitle": "設計依頼検索",
   "stuff.planReqPopup.btn1": "検索",
@@ -1051,6 +1052,7 @@
   "estimate.detail.save.requiredItem": "製品は1つ以上登録する必要があります。",
   "estimate.detail.save.requiredCharger": "担当者は必須です。",
   "estimate.detail.save.requiredObjectName": "案件名は必須です。",
+  "estimate.detail.save.objectNameTooLong": "案件名（敬称含む）は50文字以内で入力してください。",
   "estimate.detail.save.requiredPkgAsp": "住宅PKG単価は0より大きい値を入力してください。",
   "estimate.detail.save.requiredEstimateDate": "見積日は必須です。",
   "estimate.detail.save.requiredItemId": "製品を選択してください。",
diff --git a/src/locales/ko.json b/src/locales/ko.json
index 5d9a5474..a596bffe 100644
--- a/src/locales/ko.json
+++ b/src/locales/ko.json
@@ -801,6 +801,7 @@
   "stuff.detail.save.valierror2": "설치높이는 0보다 큰 값을 입력하세요",
   "stuff.detail.save.valierror3": "{0} 필수 입력 항목입니다.",
   "stuff.detail.save.valierror4": "2차 판매점명은 필수 선택사항입니다.",
+  "stuff.detail.save.objectNameTooLong": "물건명과 경칭을 합쳐 50자 이내로 입력해주세요.",
   "stuff.detail.move.confirmMsg": "물건정보 화면으로 이동합니다. [저장]하지 않은 도면정보는 삭제됩니다. 물건정보 화면으로 이동하시겠습니까?",
   "stuff.planReqPopup.popTitle": "설계 의뢰 검색",
   "stuff.planReqPopup.btn1": "검색",
@@ -1051,6 +1052,7 @@
   "estimate.detail.save.requiredItem": "제품은 1개이상 등록해야 됩니다.",
   "estimate.detail.save.requiredCharger": "담당자는 필수값 입니다.",
   "estimate.detail.save.requiredObjectName": "안건명은 필수값 입니다.",
+  "estimate.detail.save.objectNameTooLong": "안건명과 경칭을 합쳐 50자 이내로 입력해주세요.",
   "estimate.detail.save.requiredPkgAsp": "주택pkg 단가는 0보다 큰 값을 입력하세요.",
   "estimate.detail.save.requiredEstimateDate": "견적일은 필수값 입니다.",
   "estimate.detail.save.requiredItemId": "제품을 선택해주세요.",