diff --git a/backend/app/schemas/admin.py b/backend/app/schemas/admin.py
index 438ae387..fdf5eb6a 100644
--- a/backend/app/schemas/admin.py
+++ b/backend/app/schemas/admin.py
@@ -319,7 +319,7 @@ class AdminUserCreate(BaseModel):
     name: str = Field(..., min_length=1, max_length=255)
     account_mode: Literal["existing", "personal"]
     account_display_code: Optional[str] = Field(None, description="Required when account_mode='existing'")
-    account_role: Optional[Literal["engineer", "viewer"]] = Field(None, description="Required when account_mode='existing'")
+    account_role: Optional[Literal["owner", "admin", "engineer", "viewer"]] = Field(None, description="Required when account_mode='existing'")
     send_email: bool = True
 
 
diff --git a/backend/app/schemas/user.py b/backend/app/schemas/user.py
index a48df65b..ea554b0a 100644
--- a/backend/app/schemas/user.py
+++ b/backend/app/schemas/user.py
@@ -68,4 +68,4 @@ class RoleUpdate(BaseModel):
 
 
 class AccountRoleUpdate(BaseModel):
-    account_role: str = Field(..., pattern="^(engineer|viewer)$")
+    account_role: str = Field(..., pattern="^(owner|admin|engineer|viewer)$")
diff --git a/frontend/src/pages/admin/AccountDetailPage.tsx b/frontend/src/pages/admin/AccountDetailPage.tsx
index fef6297e..cf0c2927 100644
--- a/frontend/src/pages/admin/AccountDetailPage.tsx
+++ b/frontend/src/pages/admin/AccountDetailPage.tsx
@@ -44,7 +44,7 @@ export function AccountDetailPage() {
   const [createForm, setCreateForm] = useState({
     email: '',
     name: '',
-    account_role: 'engineer' as 'engineer' | 'viewer',
+    account_role: 'engineer' as 'owner' | 'admin' | 'engineer' | 'viewer',
     send_email: true,
   })
   const [createLoading, setCreateLoading] = useState(false)
@@ -117,7 +117,7 @@ export function AccountDetailPage() {
         send_email: createForm.send_email,
       })
       setShowCreateUserModal(false)
-      setCreateForm({ email: '', name: '', account_role: 'engineer', send_email: true })
+      setCreateForm({ email: '', name: '', account_role: 'engineer' as 'owner' | 'admin' | 'engineer' | 'viewer', send_email: true })
       setTempPassword(result.temporary_password)
       setCopiedPassword(false)
       toast.success(result.email_sent ? 'User created and welcome email sent' : 'User created')
@@ -365,6 +365,8 @@ export function AccountDetailPage() {
                             'focus:outline-hidden focus:border-primary focus:ring-2 focus:ring-primary/20'
                           )}
                         >
+                          <option value="owner">Owner</option>
+                          <option value="admin">Admin</option>
                           <option value="engineer">Engineer</option>
                           <option value="viewer">Viewer</option>
                         </select>
@@ -543,12 +545,14 @@ export function AccountDetailPage() {
             <label className="mb-1 block text-sm font-medium text-foreground">Account Role</label>
             <select
               value={createForm.account_role}
-              onChange={(e) => setCreateForm((f) => ({ ...f, account_role: e.target.value as 'engineer' | 'viewer' }))}
+              onChange={(e) => setCreateForm((f) => ({ ...f, account_role: e.target.value as 'owner' | 'admin' | 'engineer' | 'viewer' }))}
               className={cn(
                 'w-full rounded-md border border-border bg-card px-3 py-2 text-sm text-foreground',
                 'focus:outline-hidden focus:border-primary focus:ring-2 focus:ring-primary/20'
               )}
             >
+              <option value="owner">Owner</option>
+              <option value="admin">Admin</option>
               <option value="engineer">Engineer</option>
               <option value="viewer">Viewer</option>
             </select>
diff --git a/frontend/src/pages/admin/AccountsPage.tsx b/frontend/src/pages/admin/AccountsPage.tsx
index 4baf6fbe..87acb69e 100644
--- a/frontend/src/pages/admin/AccountsPage.tsx
+++ b/frontend/src/pages/admin/AccountsPage.tsx
@@ -74,7 +74,7 @@ export function UsersPage() {
     name: '',
     account_mode: 'personal' as 'existing' | 'personal',
     account_display_code: '',
-    account_role: 'engineer' as 'engineer' | 'viewer',
+    account_role: 'engineer' as 'owner' | 'admin' | 'engineer' | 'viewer',
     send_email: true,
   })
   const [createLoading, setCreateLoading] = useState(false)
@@ -700,12 +700,14 @@ export function UsersPage() {
                 <label className="mb-1 block text-sm font-medium text-foreground">Account Role</label>
                 <select
                   value={createForm.account_role}
-                  onChange={(e) => setCreateForm((form) => ({ ...form, account_role: e.target.value as 'engineer' | 'viewer' }))}
+                  onChange={(e) => setCreateForm((form) => ({ ...form, account_role: e.target.value as 'owner' | 'admin' | 'engineer' | 'viewer' }))}
                   className={cn(
                     'w-full rounded-md border border-border bg-card px-3 py-2 text-sm text-foreground',
                     'focus:outline-hidden focus:border-primary focus:ring-2 focus:ring-primary/20'
                   )}
                 >
+                  <option value="owner">Owner</option>
+                  <option value="admin">Admin</option>
                   <option value="engineer">Engineer</option>
                   <option value="viewer">Viewer</option>
                 </select>
diff --git a/frontend/src/types/admin.ts b/frontend/src/types/admin.ts
index 0110d0a4..d8de4f96 100644
--- a/frontend/src/types/admin.ts
+++ b/frontend/src/types/admin.ts
@@ -266,7 +266,7 @@ export interface AdminUserCreate {
   name: string
   account_mode: 'existing' | 'personal'
   account_display_code?: string
-  account_role?: 'engineer' | 'viewer'
+  account_role?: 'owner' | 'admin' | 'engineer' | 'viewer'
   send_email: boolean
 }