diff --git a/config/version.yaml b/config/version.yaml
index bb12e2d..00fb710 100644
--- a/config/version.yaml
+++ b/config/version.yaml
@@ -1,2 +1,2 @@
 parameters:
-    app.version: '0.1.17'
+    app.version: '0.1.18'
diff --git a/frontend/components/hours/HoursDayView.vue b/frontend/components/hours/HoursDayView.vue
index b1c8322..384e49f 100644
--- a/frontend/components/hours/HoursDayView.vue
+++ b/frontend/components/hours/HoursDayView.vue
@@ -26,6 +26,18 @@
             @change="onBulkValidationChange"
           />
         </span>
+        <span v-else-if="isSiteManager" class="inline-flex items-center gap-2">
+          <span>Site</span>
+          <input
+            ref="bulkSiteValidationInput"
+            :checked="isBulkSiteValidationChecked"
+            type="checkbox"
+            class="h-4 w-4"
+            :class="canBulkToggleSiteValidation ? 'cursor-pointer' : 'cursor-not-allowed opacity-50'"
+            :disabled="!canBulkToggleSiteValidation"
+            @change="onBulkSiteValidationChange"
+          />
+        </span>
         <span v-else>Site <Icon name="mdi:check-bold" class="ml-1"/></span>
         <span v-if="!isAdmin">RH  <Icon name="mdi:check-bold" class="ml-1"/></span>
       </div>
@@ -173,6 +185,7 @@ import type { HourRow } from './types'
 
 const rows = defineModel<Record<number, HourRow>>('rows', { required: true })
 const bulkValidationInput = ref<HTMLInputElement | null>(null)
+const bulkSiteValidationInput = ref<HTMLInputElement | null>(null)
 
 const props = defineProps<{
   employees: Employee[]
@@ -193,9 +206,13 @@ const props = defineProps<{
   canToggleSiteValidation: (employeeId: number) => boolean
   isBulkValidationChecked: boolean
   isBulkValidationIndeterminate: boolean
+  isBulkSiteValidationChecked: boolean
+  isBulkSiteValidationIndeterminate: boolean
+  canBulkToggleSiteValidation: boolean
   onToggleValidation: (employeeId: number, checked: boolean) => void
   onToggleSiteValidation: (employeeId: number, checked: boolean) => void
-  onToggleValidationBulk: (checked: boolean) => void
+  onToggleValidationBulk: (checked: boolean) => Promise<void> | void
+  onToggleSiteValidationBulk: (checked: boolean) => Promise<void> | void
   getRowMetrics: (employeeId: number) => { dayMinutes: number; nightMinutes: number; totalMinutes: number }
   getRowAbsenceLabel: (employeeId: number) => string
   getRowAbsenceStyle: (employeeId: number) => { backgroundColor: string } | undefined
@@ -208,6 +225,10 @@ const onBulkValidationChange = (event: Event) => {
   props.onToggleValidationBulk((event.target as HTMLInputElement).checked)
 }
 
+const onBulkSiteValidationChange = (event: Event) => {
+  props.onToggleSiteValidationBulk((event.target as HTMLInputElement).checked)
+}
+
 const onToggleSiteValidation = (employeeId: number, checked: boolean) => {
   props.onToggleSiteValidation(employeeId, checked)
 }
@@ -220,4 +241,13 @@ watch(
   },
   { immediate: true }
 )
+
+watch(
+  () => props.isBulkSiteValidationIndeterminate,
+  (isIndeterminate) => {
+    if (!bulkSiteValidationInput.value) return
+    bulkSiteValidationInput.value.indeterminate = isIndeterminate
+  },
+  { immediate: true }
+)
 </script>
diff --git a/frontend/composables/useHoursPage.ts b/frontend/composables/useHoursPage.ts
index 36ffa21..864291a 100644
--- a/frontend/composables/useHoursPage.ts
+++ b/frontend/composables/useHoursPage.ts
@@ -12,6 +12,8 @@ import { listAbsenceTypes } from '~/services/absence-types'
 import { createAbsence, deleteAbsence, listAbsences, updateAbsence } from '~/services/absences'
 import { listPublicHolidays } from '~/services/public-holidays'
 import {
+  bulkUpdateWorkHourSiteValidation,
+  bulkUpdateWorkHourValidation,
   bulkUpsertWorkHours,
   getWorkHourDayContext,
   getWeeklyWorkHourSummary,
@@ -136,25 +138,61 @@ export const useHoursPage = () => {
     return true
   }
 
-  const validatableEmployeeIds = computed(() => {
-    return employees.value
+  const canCreateValidationRowFromAbsence = (employeeId: number) => {
+    const row = rows.value[employeeId]
+    if (row?.workHourId) return false
+    const dayRow = dayContextByEmployeeId.value.get(employeeId)
+    return !!dayRow?.absenceLabel && hasContractAtSelectedDate(employeeId)
+  }
+
+  const canCreateSiteValidationRowFromAbsence = (employeeId: number) => {
+    const row = rows.value[employeeId]
+    if (row?.workHourId) return false
+    const dayRow = dayContextByEmployeeId.value.get(employeeId)
+    return !!dayRow?.absenceLabel && hasContractAtSelectedDate(employeeId)
+  }
+
+  const bulkValidatableEmployeeIds = computed(() => {
+    return visibleEmployees.value
       .map((employee) => employee.id)
-      .filter((employeeId) => canToggleValidation(employeeId))
+      .filter((employeeId) => canToggleValidation(employeeId) || canCreateValidationRowFromAbsence(employeeId))
   })
 
   const isBulkValidationChecked = computed(() => {
-    const ids = validatableEmployeeIds.value
+    const ids = bulkValidatableEmployeeIds.value
     if (ids.length === 0) return false
     return ids.every((employeeId) => rows.value[employeeId]?.isValid ?? false)
   })
 
   const isBulkValidationIndeterminate = computed(() => {
-    const ids = validatableEmployeeIds.value
+    const ids = bulkValidatableEmployeeIds.value
     if (ids.length === 0) return false
     const checkedCount = ids.filter((employeeId) => rows.value[employeeId]?.isValid ?? false).length
     return checkedCount > 0 && checkedCount < ids.length
   })
 
+  const bulkSiteValidatableEmployeeIds = computed(() => {
+    if (!isSiteManager.value) return []
+    return visibleEmployees.value
+      .map((employee) => employee.id)
+      .filter((employeeId) => canToggleSiteValidation(employeeId) || canCreateSiteValidationRowFromAbsence(employeeId))
+  })
+
+  const isBulkSiteValidationChecked = computed(() => {
+    const ids = bulkSiteValidatableEmployeeIds.value
+    if (ids.length === 0) return false
+    return ids.every((employeeId) => rows.value[employeeId]?.isSiteValid ?? false)
+  })
+
+  const isBulkSiteValidationIndeterminate = computed(() => {
+    const ids = bulkSiteValidatableEmployeeIds.value
+    if (ids.length === 0) return false
+    const checkedCount = ids.filter((employeeId) => rows.value[employeeId]?.isSiteValid ?? false).length
+    return checkedCount > 0 && checkedCount < ids.length
+  })
+
+  const canBulkToggleSiteValidation = computed(() => bulkSiteValidatableEmployeeIds.value.length > 0)
+
   const dayContextByEmployeeId = computed(() => {
     const map = new Map<number, WorkHourDayContext['rows'][number]>()
     for (const row of dayContext.value?.rows ?? []) {
@@ -748,44 +786,169 @@ export const useHoursPage = () => {
   }
 
   const toggleValidationBulk = async (checked: boolean) => {
-    const employeeIds = validatableEmployeeIds.value
+    const employeeIds = bulkValidatableEmployeeIds.value
     if (employeeIds.length === 0) return
 
-    let successCount = 0
-    let failedCount = 0
+    const pendingIds = new Set(validatingRowIds.value)
+    const availableEmployeeIds = employeeIds.filter((employeeId) => !pendingIds.has(employeeId))
+    if (availableEmployeeIds.length === 0) return
 
-    for (const employeeId of employeeIds) {
-      if (isValidationPending(employeeId)) continue
-      try {
-        await toggleValidation(employeeId, checked, { toast: false })
-        successCount += 1
-      } catch {
-        failedCount += 1
+    if (checked) {
+      const toCreateIds = availableEmployeeIds.filter((employeeId) => canCreateValidationRowFromAbsence(employeeId))
+      if (toCreateIds.length > 0) {
+        await bulkUpsertWorkHours({
+          workDate: selectedDate.value,
+          entries: toCreateIds.map((employeeId) => ({
+            employeeId,
+            morningFrom: null,
+            morningTo: null,
+            afternoonFrom: null,
+            afternoonTo: null,
+            eveningFrom: null,
+            eveningTo: null,
+            isPresentMorning: false,
+            isPresentAfternoon: false
+          }))
+        }, { toast: false })
+
+        await loadWorkHours()
       }
     }
 
-    if (failedCount === 0) {
-      toast.success({
-        title: 'Succès',
-        message: checked
-          ? `${successCount} ligne(s) validée(s).`
-          : `${successCount} validation(s) retirée(s).`
+    const targetEmployeeIds = availableEmployeeIds.filter((employeeId) => canToggleValidation(employeeId))
+    if (targetEmployeeIds.length === 0) {
+      toast.error({
+        title: 'Validation impossible',
+        message: 'Aucune ligne ne peut être validée.'
       })
       return
     }
 
-    if (successCount === 0) {
+    validatingRowIds.value = Array.from(new Set([...validatingRowIds.value, ...targetEmployeeIds]))
+
+    try {
+      const result = await bulkUpdateWorkHourValidation({
+        workDate: selectedDate.value,
+        isValid: checked,
+        employeeIds: targetEmployeeIds
+      }, { toast: false })
+
+      await loadWorkHours()
+
+      if (result.updated === 0) {
+        toast.error({
+          title: 'Erreur',
+          message: 'Aucune ligne mise à jour.'
+        })
+        return
+      }
+
+      if (result.skipped > 0) {
+        toast.success({
+          title: 'Succès partiel',
+          message: `${result.updated} mise(s) à jour, ${result.skipped} ignorée(s).`
+        })
+        return
+      }
+
+      toast.success({
+        title: 'Succès',
+        message: checked
+          ? `${result.updated} ligne(s) validée(s).`
+          : `${result.updated} validation(s) retirée(s).`
+      })
+    } catch {
       toast.error({
         title: 'Erreur',
         message: 'Impossible de mettre à jour les validations.'
       })
+    } finally {
+      validatingRowIds.value = validatingRowIds.value.filter((id) => !targetEmployeeIds.includes(id))
+    }
+  }
+
+  const toggleSiteValidationBulk = async (checked: boolean) => {
+    if (!isSiteManager.value) return
+
+    const employeeIds = bulkSiteValidatableEmployeeIds.value
+    if (employeeIds.length === 0) return
+
+    const pendingIds = new Set(siteValidatingRowIds.value)
+    const availableEmployeeIds = employeeIds.filter((employeeId) => !pendingIds.has(employeeId))
+    if (availableEmployeeIds.length === 0) return
+
+    if (checked) {
+      const toCreateIds = availableEmployeeIds.filter((employeeId) => canCreateSiteValidationRowFromAbsence(employeeId))
+      if (toCreateIds.length > 0) {
+        await bulkUpsertWorkHours({
+          workDate: selectedDate.value,
+          entries: toCreateIds.map((employeeId) => ({
+            employeeId,
+            morningFrom: null,
+            morningTo: null,
+            afternoonFrom: null,
+            afternoonTo: null,
+            eveningFrom: null,
+            eveningTo: null,
+            isPresentMorning: false,
+            isPresentAfternoon: false
+          }))
+        }, { toast: false })
+
+        await loadWorkHours()
+      }
+    }
+
+    const targetEmployeeIds = availableEmployeeIds.filter((employeeId) => canToggleSiteValidation(employeeId))
+    if (targetEmployeeIds.length === 0) {
+      toast.error({
+        title: 'Validation impossible',
+        message: 'Aucune ligne ne peut être validée côté site.'
+      })
       return
     }
 
-    toast.error({
-      title: 'Erreur',
-      message: `${successCount} mise(s) à jour, ${failedCount} en échec.`
-    })
+    siteValidatingRowIds.value = Array.from(new Set([...siteValidatingRowIds.value, ...targetEmployeeIds]))
+
+    try {
+      const result = await bulkUpdateWorkHourSiteValidation({
+        workDate: selectedDate.value,
+        isSiteValid: checked,
+        employeeIds: targetEmployeeIds
+      }, { toast: false })
+
+      await loadWorkHours()
+
+      if (result.updated === 0) {
+        toast.error({
+          title: 'Erreur',
+          message: 'Aucune ligne site mise à jour.'
+        })
+        return
+      }
+
+      if (result.skipped > 0) {
+        toast.success({
+          title: 'Succès partiel',
+          message: `${result.updated} mise(s) à jour, ${result.skipped} ignorée(s).`
+        })
+        return
+      }
+
+      toast.success({
+        title: 'Succès',
+        message: checked
+          ? `${result.updated} validation(s) site enregistrée(s).`
+          : `${result.updated} validation(s) site retirée(s).`
+      })
+    } catch {
+      toast.error({
+        title: 'Erreur',
+        message: 'Impossible de mettre à jour les validations site.'
+      })
+    } finally {
+      siteValidatingRowIds.value = siteValidatingRowIds.value.filter((id) => !targetEmployeeIds.includes(id))
+    }
   }
 
   const loadEmployees = async () => {
@@ -965,12 +1128,15 @@ export const useHoursPage = () => {
     isSiteValidationPending,
     canToggleValidation,
     canToggleSiteValidation,
-    validatableEmployeeIds,
     isBulkValidationChecked,
     isBulkValidationIndeterminate,
+    isBulkSiteValidationChecked,
+    isBulkSiteValidationIndeterminate,
+    canBulkToggleSiteValidation,
     toggleValidation,
     toggleSiteValidation,
     toggleValidationBulk,
+    toggleSiteValidationBulk,
     getRowMetrics,
     getRowAbsenceLabel,
     getRowAbsenceStyle,
diff --git a/frontend/pages/hours.vue b/frontend/pages/hours.vue
index b32c2da..9245760 100644
--- a/frontend/pages/hours.vue
+++ b/frontend/pages/hours.vue
@@ -56,9 +56,13 @@
                 :can-toggle-site-validation="canToggleSiteValidation"
                 :is-bulk-validation-checked="isBulkValidationChecked"
                 :is-bulk-validation-indeterminate="isBulkValidationIndeterminate"
+                :is-bulk-site-validation-checked="isBulkSiteValidationChecked"
+                :is-bulk-site-validation-indeterminate="isBulkSiteValidationIndeterminate"
+                :can-bulk-toggle-site-validation="canBulkToggleSiteValidation"
                 :on-toggle-validation="toggleValidation"
                 :on-toggle-site-validation="toggleSiteValidation"
                 :on-toggle-validation-bulk="toggleValidationBulk"
+                :on-toggle-site-validation-bulk="toggleSiteValidationBulk"
                 :get-row-metrics="getRowMetrics"
                 :get-row-absence-label="getRowAbsenceLabel"
                 :get-row-absence-style="getRowAbsenceStyle"
@@ -159,9 +163,13 @@ const {
   canToggleSiteValidation,
   isBulkValidationChecked,
   isBulkValidationIndeterminate,
+  isBulkSiteValidationChecked,
+  isBulkSiteValidationIndeterminate,
+  canBulkToggleSiteValidation,
   toggleValidation,
   toggleSiteValidation,
   toggleValidationBulk,
+  toggleSiteValidationBulk,
   getRowMetrics,
   getRowAbsenceLabel,
   getRowAbsenceStyle,
diff --git a/frontend/services/work-hours.ts b/frontend/services/work-hours.ts
index 32e755b..9f3dbe2 100644
--- a/frontend/services/work-hours.ts
+++ b/frontend/services/work-hours.ts
@@ -58,6 +58,29 @@ export const updateWorkHourValidation = async (
   )
 }
 
+export const bulkUpdateWorkHourValidation = async (payload: {
+  workDate: string
+  isValid: boolean
+  employeeIds: number[]
+}, options?: { toast?: boolean }) => {
+  const api = useApi()
+  return api.post<{
+    requested: number
+    updated: number
+    skipped: number
+    updatedEmployeeIds: number[]
+    skippedEmployeeIds: number[]
+  }>(
+    '/work-hours/bulk-validation',
+    payload,
+    {
+      toast: options?.toast ?? true,
+      toastSuccessMessage: payload.isValid ? 'Validations enregistrées.' : 'Validations retirées.',
+      toastErrorMessage: "Impossible de mettre à jour les validations."
+    }
+  )
+}
+
 export const updateWorkHourSiteValidation = async (
   id: number,
   isSiteValid: boolean,
@@ -75,6 +98,29 @@ export const updateWorkHourSiteValidation = async (
   )
 }
 
+export const bulkUpdateWorkHourSiteValidation = async (payload: {
+  workDate: string
+  isSiteValid: boolean
+  employeeIds: number[]
+}, options?: { toast?: boolean }) => {
+  const api = useApi()
+  return api.post<{
+    requested: number
+    updated: number
+    skipped: number
+    updatedEmployeeIds: number[]
+    skippedEmployeeIds: number[]
+  }>(
+    '/work-hours/site-bulk-validation',
+    payload,
+    {
+      toast: options?.toast ?? true,
+      toastSuccessMessage: payload.isSiteValid ? 'Validations site enregistrées.' : 'Validations site retirées.',
+      toastErrorMessage: "Impossible de mettre à jour les validations site."
+    }
+  )
+}
+
 export const getWeeklyWorkHourSummary = async (weekStart: string) => {
   const api = useApi()
   return api.get<WeeklyWorkHourSummary>(
diff --git a/src/ApiResource/WorkHourBulkSiteValidation.php b/src/ApiResource/WorkHourBulkSiteValidation.php
new file mode 100644
index 0000000..7ccd443
--- /dev/null
+++ b/src/ApiResource/WorkHourBulkSiteValidation.php
@@ -0,0 +1,31 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\ApiResource;
+
+use ApiPlatform\Metadata\ApiResource;
+use ApiPlatform\Metadata\Post;
+use App\State\WorkHourBulkSiteValidationProcessor;
+
+#[ApiResource(
+    operations: [
+        new Post(
+            uriTemplate: '/work-hours/site-bulk-validation',
+            security: "is_granted('ROLE_USER')",
+            output: WorkHourBulkValidationResult::class,
+            processor: WorkHourBulkSiteValidationProcessor::class
+        ),
+    ]
+)]
+final class WorkHourBulkSiteValidation
+{
+    public string $workDate = '';
+
+    public bool $isSiteValid = false;
+
+    /**
+     * @var list<int>
+     */
+    public array $employeeIds = [];
+}
diff --git a/src/ApiResource/WorkHourBulkValidation.php b/src/ApiResource/WorkHourBulkValidation.php
new file mode 100644
index 0000000..6ff6fc2
--- /dev/null
+++ b/src/ApiResource/WorkHourBulkValidation.php
@@ -0,0 +1,31 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\ApiResource;
+
+use ApiPlatform\Metadata\ApiResource;
+use ApiPlatform\Metadata\Post;
+use App\State\WorkHourBulkValidationProcessor;
+
+#[ApiResource(
+    operations: [
+        new Post(
+            uriTemplate: '/work-hours/bulk-validation',
+            security: "is_granted('ROLE_ADMIN')",
+            output: WorkHourBulkValidationResult::class,
+            processor: WorkHourBulkValidationProcessor::class
+        ),
+    ]
+)]
+final class WorkHourBulkValidation
+{
+    public string $workDate = '';
+
+    public bool $isValid = false;
+
+    /**
+     * @var list<int>
+     */
+    public array $employeeIds = [];
+}
diff --git a/src/ApiResource/WorkHourBulkValidationResult.php b/src/ApiResource/WorkHourBulkValidationResult.php
new file mode 100644
index 0000000..196fcf2
--- /dev/null
+++ b/src/ApiResource/WorkHourBulkValidationResult.php
@@ -0,0 +1,22 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\ApiResource;
+
+final class WorkHourBulkValidationResult
+{
+    public int $requested = 0;
+    public int $updated   = 0;
+    public int $skipped   = 0;
+
+    /**
+     * @var list<int>
+     */
+    public array $updatedEmployeeIds = [];
+
+    /**
+     * @var list<int>
+     */
+    public array $skippedEmployeeIds = [];
+}
diff --git a/src/Service/WorkHours/WorkHourBulkValidationExecutor.php b/src/Service/WorkHours/WorkHourBulkValidationExecutor.php
new file mode 100644
index 0000000..fb09f6e
--- /dev/null
+++ b/src/Service/WorkHours/WorkHourBulkValidationExecutor.php
@@ -0,0 +1,103 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Service\WorkHours;
+
+use App\ApiResource\WorkHourBulkValidationResult;
+use App\Entity\User;
+use App\Entity\WorkHour;
+use App\Repository\EmployeeRepository;
+use App\Repository\WorkHourRepository;
+use DateTimeImmutable;
+use Doctrine\ORM\EntityManagerInterface;
+use Symfony\Component\HttpKernel\Exception\AccessDeniedHttpException;
+use Symfony\Component\HttpKernel\Exception\UnprocessableEntityHttpException;
+
+final readonly class WorkHourBulkValidationExecutor
+{
+    public function __construct(
+        private EntityManagerInterface $entityManager,
+        private EmployeeRepository $employeeRepository,
+        private WorkHourRepository $workHourRepository,
+    ) {}
+
+    /**
+     * @param list<mixed>                    $employeeIds
+     * @param callable(?WorkHour, int): bool $shouldSkip
+     * @param callable(WorkHour, int): void  $applyUpdate
+     */
+    public function execute(
+        User $user,
+        string $workDateValue,
+        array $employeeIds,
+        callable $shouldSkip,
+        callable $applyUpdate
+    ): WorkHourBulkValidationResult {
+        $workDate = DateTimeImmutable::createFromFormat('Y-m-d', $workDateValue);
+        if (!$workDate || $workDate->format('Y-m-d') !== $workDateValue) {
+            throw new UnprocessableEntityHttpException('workDate must use Y-m-d format.');
+        }
+
+        $normalizedEmployeeIds = $this->normalizeEmployeeIds($employeeIds);
+        if ([] === $normalizedEmployeeIds) {
+            throw new UnprocessableEntityHttpException('employeeIds must contain at least one employee.');
+        }
+
+        $employeesById = $this->employeeRepository->findAccessibleByIds($normalizedEmployeeIds, $user);
+        if (count($employeesById) !== count($normalizedEmployeeIds)) {
+            throw new AccessDeniedHttpException('At least one employee is unknown or outside your scope.');
+        }
+
+        $existingByEmployeeId = $this->workHourRepository
+            ->findByDateAndEmployeesIndexedByEmployeeId($workDate, array_values($employeesById))
+        ;
+
+        $result            = new WorkHourBulkValidationResult();
+        $result->requested = count($normalizedEmployeeIds);
+
+        foreach ($normalizedEmployeeIds as $employeeId) {
+            $workHour = $existingByEmployeeId[$employeeId] ?? null;
+            if (null === $workHour || $shouldSkip($workHour, $employeeId)) {
+                ++$result->skipped;
+                $result->skippedEmployeeIds[] = $employeeId;
+
+                continue;
+            }
+
+            $applyUpdate($workHour, $employeeId);
+            ++$result->updated;
+            $result->updatedEmployeeIds[] = $employeeId;
+        }
+
+        if ($result->updated > 0) {
+            $this->entityManager->flush();
+        }
+
+        return $result;
+    }
+
+    /**
+     * @param list<mixed> $employeeIds
+     *
+     * @return list<int>
+     */
+    private function normalizeEmployeeIds(array $employeeIds): array
+    {
+        $normalized = [];
+        foreach ($employeeIds as $index => $rawId) {
+            $employeeId = (int) $rawId;
+            if ($employeeId <= 0) {
+                throw new UnprocessableEntityHttpException(sprintf('employeeIds[%d] must be a positive integer.', $index));
+            }
+
+            if (isset($normalized[$employeeId])) {
+                throw new UnprocessableEntityHttpException(sprintf('Employee %d appears multiple times in payload.', $employeeId));
+            }
+
+            $normalized[$employeeId] = $employeeId;
+        }
+
+        return array_values($normalized);
+    }
+}
diff --git a/src/State/WorkHourBulkSiteValidationProcessor.php b/src/State/WorkHourBulkSiteValidationProcessor.php
new file mode 100644
index 0000000..b4a1c79
--- /dev/null
+++ b/src/State/WorkHourBulkSiteValidationProcessor.php
@@ -0,0 +1,54 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\State;
+
+use ApiPlatform\Metadata\Operation;
+use ApiPlatform\State\ProcessorInterface;
+use App\ApiResource\WorkHourBulkSiteValidation;
+use App\ApiResource\WorkHourBulkValidationResult;
+use App\Entity\User;
+use App\Entity\WorkHour;
+use App\Service\WorkHours\WorkHourBulkValidationExecutor;
+use Symfony\Bundle\SecurityBundle\Security;
+use Symfony\Component\HttpKernel\Exception\AccessDeniedHttpException;
+use Symfony\Component\HttpKernel\Exception\BadRequestHttpException;
+
+final readonly class WorkHourBulkSiteValidationProcessor implements ProcessorInterface
+{
+    public function __construct(
+        private Security $security,
+        private WorkHourBulkValidationExecutor $executor,
+    ) {}
+
+    public function process(
+        mixed $data,
+        Operation $operation,
+        array $uriVariables = [],
+        array $context = []
+    ): WorkHourBulkValidationResult {
+        if (!$data instanceof WorkHourBulkSiteValidation) {
+            throw new BadRequestHttpException('Invalid payload.');
+        }
+
+        $user = $this->security->getUser();
+        if (!$user instanceof User) {
+            throw new AccessDeniedHttpException('Authentication required.');
+        }
+
+        if (in_array('ROLE_ADMIN', $user->getRoles(), true) || in_array('ROLE_SELF', $user->getRoles(), true)) {
+            throw new AccessDeniedHttpException('Only site managers can bulk update site validation.');
+        }
+
+        return $this->executor->execute(
+            user: $user,
+            workDateValue: $data->workDate,
+            employeeIds: $data->employeeIds,
+            shouldSkip: static fn (WorkHour $workHour): bool => $workHour->isValid() || $workHour->isSiteValid() === $data->isSiteValid,
+            applyUpdate: static function (WorkHour $workHour) use ($data): void {
+                $workHour->setIsSiteValid($data->isSiteValid);
+            }
+        );
+    }
+}
diff --git a/src/State/WorkHourBulkValidationProcessor.php b/src/State/WorkHourBulkValidationProcessor.php
new file mode 100644
index 0000000..d0d471f
--- /dev/null
+++ b/src/State/WorkHourBulkValidationProcessor.php
@@ -0,0 +1,54 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\State;
+
+use ApiPlatform\Metadata\Operation;
+use ApiPlatform\State\ProcessorInterface;
+use App\ApiResource\WorkHourBulkValidation;
+use App\ApiResource\WorkHourBulkValidationResult;
+use App\Entity\User;
+use App\Entity\WorkHour;
+use App\Service\WorkHours\WorkHourBulkValidationExecutor;
+use Symfony\Bundle\SecurityBundle\Security;
+use Symfony\Component\HttpKernel\Exception\AccessDeniedHttpException;
+use Symfony\Component\HttpKernel\Exception\BadRequestHttpException;
+
+final readonly class WorkHourBulkValidationProcessor implements ProcessorInterface
+{
+    public function __construct(
+        private Security $security,
+        private WorkHourBulkValidationExecutor $executor,
+    ) {}
+
+    public function process(
+        mixed $data,
+        Operation $operation,
+        array $uriVariables = [],
+        array $context = []
+    ): WorkHourBulkValidationResult {
+        if (!$data instanceof WorkHourBulkValidation) {
+            throw new BadRequestHttpException('Invalid payload.');
+        }
+
+        $user = $this->security->getUser();
+        if (!$user instanceof User) {
+            throw new AccessDeniedHttpException('Authentication required.');
+        }
+
+        if (!in_array('ROLE_ADMIN', $user->getRoles(), true)) {
+            throw new AccessDeniedHttpException('Only admins can bulk validate work hours.');
+        }
+
+        return $this->executor->execute(
+            user: $user,
+            workDateValue: $data->workDate,
+            employeeIds: $data->employeeIds,
+            shouldSkip: static fn (WorkHour $workHour): bool => $workHour->isValid() === $data->isValid,
+            applyUpdate: static function (WorkHour $workHour) use ($data): void {
+                $workHour->setIsValid($data->isValid);
+            }
+        );
+    }
+}