diff --git a/loko/inspections/migrations/0011_alter_hotboxinspection_cracking_and_more.py b/loko/inspections/migrations/0011_alter_hotboxinspection_cracking_and_more.py
new file mode 100644
index 0000000..4ab8543
--- /dev/null
+++ b/loko/inspections/migrations/0011_alter_hotboxinspection_cracking_and_more.py
@@ -0,0 +1,33 @@
+# Generated by Django 6.0.7 on 2026-09-18 10:10
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('inspections', '0010_hotboxinspection'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='hotboxinspection',
+            name='cracking',
+            field=models.CharField(blank=True, choices=[('none', 'Aucune fissure'), ('minor', 'Petites fissures / Faïençage'), ('major', 'Grosses fissures / Fissures ouvertes')], default=None, max_length=50, null=True, verbose_name='Fissuration'),
+        ),
+        migrations.AlterField(
+            model_name='hotboxinspection',
+            name='joint_level',
+            field=models.CharField(blank=True, choices=[('flush', 'Bien à niveau / Arasé'), ('slight_bump_hollow', 'Léger décalage / Creux ou bosse'), ('step', 'Ressaut important (> 1-2 cm)')], default=None, max_length=50, null=True, verbose_name='Planéité / Arasement'),
+        ),
+        migrations.AlterField(
+            model_name='hotboxinspection',
+            name='joint_sealing',
+            field=models.CharField(blank=True, choices=[('good', 'Joints bien fermés / scellés'), ('cracked', 'Joints fissurés ou abîmés'), ('open', 'Joints ouverts ou décollés')], default=None, max_length=50, null=True, verbose_name='Joints de raccordement'),
+        ),
+        migrations.AlterField(
+            model_name='hotboxinspection',
+            name='water_drainage',
+            field=models.CharField(blank=True, choices=[('good', 'Bon écoulement / Pas de flaque'), ('stagnation', "Eau stagnante / Flaque d'eau")], default=None, max_length=50, null=True, verbose_name='Évacuation des eaux pluviales'),
+        ),
+    ]
diff --git a/loko/inspections/models.py b/loko/inspections/models.py
index 69c76df..baf7d45 100644
--- a/loko/inspections/models.py
+++ b/loko/inspections/models.py
@@ -586,6 +586,8 @@ class Inspection(models.Model):
     @property
     def detailed_inspection(self):
         """Downcast à la sous-classe spécialisée si disponible (ex: ParkingSpotInspection, GiepInspection, SignPanelInspection, HotBoxInspection)."""
+        if self.__class__ is not Inspection:
+            return self
         if hasattr(self, 'parkingspotinspection'):
             return self.parkingspotinspection
         if hasattr(self, 'giepinspection'):
@@ -1062,7 +1064,7 @@ class HotBoxInspection(Inspection):
     joint_level = models.CharField(
         max_length=50,
         choices=JOINT_LEVEL_CHOICES,
-        default='flush',
+        default=None,
         null=True,
         blank=True,
         verbose_name=_("Planéité / Arasement")
@@ -1076,7 +1078,7 @@ class HotBoxInspection(Inspection):
     joint_sealing = models.CharField(
         max_length=50,
         choices=JOINT_SEALING_CHOICES,
-        default='good',
+        default=None,
         null=True,
         blank=True,
         verbose_name=_("Joints de raccordement")
@@ -1090,7 +1092,7 @@ class HotBoxInspection(Inspection):
     cracking = models.CharField(
         max_length=50,
         choices=CRACKING_CHOICES,
-        default='none',
+        default=None,
         null=True,
         blank=True,
         verbose_name=_("Fissuration")
@@ -1103,7 +1105,7 @@ class HotBoxInspection(Inspection):
     water_drainage = models.CharField(
         max_length=50,
         choices=WATER_DRAINAGE_CHOICES,
-        default='good',
+        default=None,
         null=True,
         blank=True,
         verbose_name=_("Évacuation des eaux pluviales")
@@ -1116,7 +1118,7 @@ class HotBoxInspection(Inspection):
     def compute_status(self):
         """
         Calcule automatiquement le statut de conformité ('compliant', 'non_compliant', 'damaged')
-        selon la sévérité des constats visuels.
+        selon la sévérité des constats visuels, ou None si l'évaluation n'est pas complète.
         """
         if self.joint_level == 'step' or self.joint_sealing == 'open' or self.cracking == 'major':
             return 'damaged'
@@ -1127,7 +1129,14 @@ class HotBoxInspection(Inspection):
             self.water_drainage == 'stagnation'
         ):
             return 'non_compliant'
-        return 'compliant'
+        if self.joint_level and self.joint_sealing and self.cracking and self.water_drainage:
+            return 'compliant'
+        return None
+
+    @property
+    def is_fully_evaluated(self):
+        """Indique si les 4 questions de l'inspection ont été renseignées."""
+        return bool(self.joint_level and self.joint_sealing and self.cracking and self.water_drainage)
 
 
 def inspection_document_upload_path(instance, filename):
diff --git a/loko/inspections/templates/inspections/components/asset_fields/_hotbox.html b/loko/inspections/templates/inspections/components/asset_fields/_hotbox.html
index 6715b47..281541a 100644
--- a/loko/inspections/templates/inspections/components/asset_fields/_hotbox.html
+++ b/loko/inspections/templates/inspections/components/asset_fields/_hotbox.html
@@ -6,25 +6,25 @@
         <span class="small fw-bold text-primary text-uppercase d-flex align-items-center">
             <i class="bi bi-fire text-danger me-2 fs-6"></i>{% translate "Contrôle visuel de réparation Hot Box" %}
         </span>
-        <span id="hotboxRecommendedBadge" class="badge bg-success-subtle text-success border border-success-subtle px-2.5 py-1 rounded-pill small">
-            <i class="bi bi-check-circle-fill me-1"></i>{% translate "Suggéré : Conforme" %}
+        <span id="hotboxRecommendedBadge" class="badge bg-secondary-subtle text-secondary border border-secondary-subtle px-2.5 py-1 rounded-pill small">
+            <i class="bi bi-hourglass-split me-1"></i>{% translate "4 questions à évaluer" %}
         </span>
     </div>
 
     <p class="text-muted small mb-3">
         <i class="bi bi-info-circle me-1"></i>
-        {% translate "Évaluez visuellement la zone réparée sur les 4 critères simples ci-dessous :" %}
+        {% translate "Évaluez visuellement la zone réparée sur les 4 critères ci-dessous (sans valeur par défaut) :" %}
     </p>
 
     <!-- 1. Planéité / Arasement -->
     <div class="mb-3">
         <label class="form-label small fw-bold text-secondary mb-1 d-flex align-items-center">
             <i class="bi bi-distribute-vertical me-1 text-primary"></i>
-            1. {% translate "Planéité / Arasement" %}
+            1. {% translate "Planéité / Arasement" %} <span class="text-danger ms-1">*</span>
         </label>
         <div class="row g-2">
             <div class="col-12 col-md-4">
-                <input type="radio" class="btn-check hotbox-input" name="joint_level" id="hb_level_flush" value="flush" checked>
+                <input type="radio" class="btn-check hotbox-input" name="joint_level" id="hb_level_flush" value="flush">
                 <label class="btn btn-outline-success btn-sm w-100 py-2 d-flex align-items-center justify-content-center gap-1 rounded-3" for="hb_level_flush">
                     <i class="bi bi-check-circle"></i>
                     <span>{% translate "Bien à niveau / Arasé" %}</span>
@@ -51,11 +51,11 @@
     <div class="mb-3">
         <label class="form-label small fw-bold text-secondary mb-1 d-flex align-items-center">
             <i class="bi bi-bounding-box me-1 text-info"></i>
-            2. {% translate "Joints de raccordement" %}
+            2. {% translate "Joints de raccordement" %} <span class="text-danger ms-1">*</span>
         </label>
         <div class="row g-2">
             <div class="col-12 col-md-4">
-                <input type="radio" class="btn-check hotbox-input" name="joint_sealing" id="hb_sealing_good" value="good" checked>
+                <input type="radio" class="btn-check hotbox-input" name="joint_sealing" id="hb_sealing_good" value="good">
                 <label class="btn btn-outline-success btn-sm w-100 py-2 d-flex align-items-center justify-content-center gap-1 rounded-3" for="hb_sealing_good">
                     <i class="bi bi-check-circle"></i>
                     <span>{% translate "Bien fermés / scellés" %}</span>
@@ -82,11 +82,11 @@
     <div class="mb-3">
         <label class="form-label small fw-bold text-secondary mb-1 d-flex align-items-center">
             <i class="bi bi-activity me-1 text-warning"></i>
-            3. {% translate "Fissuration" %}
+            3. {% translate "Fissuration" %} <span class="text-danger ms-1">*</span>
         </label>
         <div class="row g-2">
             <div class="col-12 col-md-4">
-                <input type="radio" class="btn-check hotbox-input" name="cracking" id="hb_cracking_none" value="none" checked>
+                <input type="radio" class="btn-check hotbox-input" name="cracking" id="hb_cracking_none" value="none">
                 <label class="btn btn-outline-success btn-sm w-100 py-2 d-flex align-items-center justify-content-center gap-1 rounded-3" for="hb_cracking_none">
                     <i class="bi bi-check-circle"></i>
                     <span>{% translate "Aucune fissure" %}</span>
@@ -113,11 +113,11 @@
     <div class="mb-2">
         <label class="form-label small fw-bold text-secondary mb-1 d-flex align-items-center">
             <i class="bi bi-droplet-half me-1 text-primary"></i>
-            4. {% translate "Évacuation des eaux pluviales" %}
+            4. {% translate "Évacuation des eaux pluviales" %} <span class="text-danger ms-1">*</span>
         </label>
         <div class="row g-2">
             <div class="col-12 col-md-6">
-                <input type="radio" class="btn-check hotbox-input" name="water_drainage" id="hb_drainage_good" value="good" checked>
+                <input type="radio" class="btn-check hotbox-input" name="water_drainage" id="hb_drainage_good" value="good">
                 <label class="btn btn-outline-success btn-sm w-100 py-2 d-flex align-items-center justify-content-center gap-1 rounded-3" for="hb_drainage_good">
                     <i class="bi bi-check-circle"></i>
                     <span>{% translate "Bon écoulement / Pas de flaque" %}</span>
@@ -137,10 +137,21 @@
 <script>
 (function() {
     function computeHotBoxStatus() {
-        const level = document.querySelector('input[name="joint_level"]:checked')?.value || 'flush';
-        const sealing = document.querySelector('input[name="joint_sealing"]:checked')?.value || 'good';
-        const cracking = document.querySelector('input[name="cracking"]:checked')?.value || 'none';
-        const drainage = document.querySelector('input[name="water_drainage"]:checked')?.value || 'good';
+        const level = document.querySelector('input[name="joint_level"]:checked')?.value;
+        const sealing = document.querySelector('input[name="joint_sealing"]:checked')?.value;
+        const cracking = document.querySelector('input[name="cracking"]:checked')?.value;
+        const drainage = document.querySelector('input[name="water_drainage"]:checked')?.value;
+
+        const count = [level, sealing, cracking, drainage].filter(Boolean).length;
+        const badge = document.getElementById('hotboxRecommendedBadge');
+
+        if (count < 4) {
+            if (badge) {
+                badge.className = 'badge bg-secondary-subtle text-secondary border border-secondary-subtle px-2.5 py-1 rounded-pill small';
+                badge.innerHTML = `<i class="bi bi-hourglass-split me-1"></i>${count}/4 {% translate "questions renseignées" %}`;
+            }
+            return;
+        }
 
         let recommended = 'compliant';
         let badgeText = '{% translate "Suggéré : Conforme" %}';
@@ -159,7 +170,6 @@
             icon = 'bi-exclamation-circle-fill';
         }
 
-        const badge = document.getElementById('hotboxRecommendedBadge');
         if (badge) {
             badge.className = `badge ${badgeClass} px-2.5 py-1 rounded-pill small`;
             badge.innerHTML = `<i class="bi ${icon} me-1"></i>${badgeText}`;
diff --git a/loko/inspections/templates/inspections/components/edit_inspection_modal.html b/loko/inspections/templates/inspections/components/edit_inspection_modal.html
index 91cffa2..c86a801 100644
--- a/loko/inspections/templates/inspections/components/edit_inspection_modal.html
+++ b/loko/inspections/templates/inspections/components/edit_inspection_modal.html
@@ -149,8 +149,8 @@
                             <h6 class="fw-bold small text-primary mb-0">
                                 <i class="bi bi-fire text-danger me-1"></i>{% translate "Contrôles visuels Hot Box" %}
                             </h6>
-                            <span id="editHotboxRecommendedBadge" class="badge bg-success-subtle text-success border border-success-subtle px-2.5 py-1 rounded-pill small">
-                                <i class="bi bi-check-circle-fill me-1"></i>{% translate "Suggéré : Conforme" %}
+                            <span id="editHotboxRecommendedBadge" class="badge bg-secondary-subtle text-secondary border border-secondary-subtle px-2.5 py-1 rounded-pill small">
+                                <i class="bi bi-hourglass-split me-1"></i>{% translate "4 questions à évaluer" %}
                             </span>
                         </div>
 
@@ -158,7 +158,7 @@
                         <div class="mb-3">
                             <label class="form-label small fw-semibold text-secondary mb-1 d-flex align-items-center">
                                 <i class="bi bi-distribute-vertical me-1 text-primary"></i>
-                                1. {% translate "Planéité / Arasement" %}
+                                1. {% translate "Planéité / Arasement" %} <span class="text-danger ms-1">*</span>
                             </label>
                             <div class="row g-2">
                                 <div class="col-12 col-md-4">
@@ -189,7 +189,7 @@
                         <div class="mb-3">
                             <label class="form-label small fw-semibold text-secondary mb-1 d-flex align-items-center">
                                 <i class="bi bi-bounding-box me-1 text-info"></i>
-                                2. {% translate "Joints de raccordement" %}
+                                2. {% translate "Joints de raccordement" %} <span class="text-danger ms-1">*</span>
                             </label>
                             <div class="row g-2">
                                 <div class="col-12 col-md-4">
@@ -220,7 +220,7 @@
                         <div class="mb-3">
                             <label class="form-label small fw-semibold text-secondary mb-1 d-flex align-items-center">
                                 <i class="bi bi-activity me-1 text-warning"></i>
-                                3. {% translate "Fissuration" %}
+                                3. {% translate "Fissuration" %} <span class="text-danger ms-1">*</span>
                             </label>
                             <div class="row g-2">
                                 <div class="col-12 col-md-4">
@@ -251,7 +251,7 @@
                         <div class="mb-2">
                             <label class="form-label small fw-semibold text-secondary mb-1 d-flex align-items-center">
                                 <i class="bi bi-droplet-half me-1 text-primary"></i>
-                                4. {% translate "Évacuation des eaux pluviales" %}
+                                4. {% translate "Évacuation des eaux pluviales" %} <span class="text-danger ms-1">*</span>
                             </label>
                             <div class="row g-2">
                                 <div class="col-12 col-md-6">
@@ -692,18 +692,28 @@ document.addEventListener('DOMContentLoaded', function() {
                     window.toggleEditMissingResultChoice(Boolean(data.is_zone_rwiz));
                 }
 
+                // Reset all result_status radios first
+                document.querySelectorAll('input[name="result_status"]').forEach(r => { r.checked = false; });
+
                 // Pre-check result_status radio
                 let targetRadioCode = data.result_status;
                 if (data.is_scheduled && targetRadioCode === 'pending') {
-                    targetRadioCode = 'compliant';
-                }
-                const rad = document.getElementById('edit_res_' + targetRadioCode);
-                if (rad) {
-                    if (data.is_zone_rwiz && targetRadioCode === 'missing') {
-                        const compRad = document.getElementById('edit_res_compliant');
-                        if (compRad) compRad.checked = true;
+                    // Pour les réparations Hot Box : ne pas présélectionner de résultat par défaut pour obliger l'évaluation
+                    if (data.is_hotbox) {
+                        targetRadioCode = null;
                     } else {
-                        rad.checked = true;
+                        targetRadioCode = 'compliant';
+                    }
+                }
+                if (targetRadioCode) {
+                    const rad = document.getElementById('edit_res_' + targetRadioCode);
+                    if (rad) {
+                        if (data.is_zone_rwiz && targetRadioCode === 'missing') {
+                            const compRad = document.getElementById('edit_res_compliant');
+                            if (compRad) compRad.checked = true;
+                        } else {
+                            rad.checked = true;
+                        }
                     }
                 }
 
@@ -763,22 +773,30 @@ document.addEventListener('DOMContentLoaded', function() {
                 const hotboxFieldsContainer = document.getElementById('editHotBoxSpecificFields');
                 if (data.is_hotbox) {
                     if (hotboxFieldsContainer) hotboxFieldsContainer.classList.remove('d-none');
-                    const jl = data.joint_level || 'flush';
-                    const js = data.joint_sealing || 'good';
-                    const cr = data.cracking || 'none';
-                    const wd = data.water_drainage || 'good';
+                    // Réinitialiser les boutons radio Hot Box (pas de valeur par défaut)
+                    document.querySelectorAll('.edit-hotbox-input').forEach(r => { r.checked = false; });
 
-                    const radLevel = document.getElementById('edit_hb_level_' + (jl === 'slight_bump_hollow' ? 'slight' : jl));
-                    if (radLevel) radLevel.checked = true;
+                    const jl = data.joint_level;
+                    const js = data.joint_sealing;
+                    const cr = data.cracking;
+                    const wd = data.water_drainage;
 
-                    const radSealing = document.getElementById('edit_hb_sealing_' + js);
-                    if (radSealing) radSealing.checked = true;
-
-                    const radCracking = document.getElementById('edit_hb_cracking_' + cr);
-                    if (radCracking) radCracking.checked = true;
-
-                    const radDrainage = document.getElementById('edit_hb_drainage_' + wd);
-                    if (radDrainage) radDrainage.checked = true;
+                    if (jl) {
+                        const radLevel = document.getElementById('edit_hb_level_' + (jl === 'slight_bump_hollow' ? 'slight' : jl));
+                        if (radLevel) radLevel.checked = true;
+                    }
+                    if (js) {
+                        const radSealing = document.getElementById('edit_hb_sealing_' + js);
+                        if (radSealing) radSealing.checked = true;
+                    }
+                    if (cr) {
+                        const radCracking = document.getElementById('edit_hb_cracking_' + cr);
+                        if (radCracking) radCracking.checked = true;
+                    }
+                    if (wd) {
+                        const radDrainage = document.getElementById('edit_hb_drainage_' + wd);
+                        if (radDrainage) radDrainage.checked = true;
+                    }
 
                     if (typeof updateEditHotBoxRecommendation === 'function') {
                         updateEditHotBoxRecommendation(false);
@@ -836,10 +854,21 @@ document.addEventListener('DOMContentLoaded', function() {
     };
 
     function updateEditHotBoxRecommendation(syncRadio = true) {
-        const level = document.querySelector('input[name="joint_level"]:checked')?.value || 'flush';
-        const sealing = document.querySelector('input[name="joint_sealing"]:checked')?.value || 'good';
-        const cracking = document.querySelector('input[name="cracking"]:checked')?.value || 'none';
-        const drainage = document.querySelector('input[name="water_drainage"]:checked')?.value || 'good';
+        const level = document.querySelector('#editHotBoxSpecificFields input[name="joint_level"]:checked')?.value;
+        const sealing = document.querySelector('#editHotBoxSpecificFields input[name="joint_sealing"]:checked')?.value;
+        const cracking = document.querySelector('#editHotBoxSpecificFields input[name="cracking"]:checked')?.value;
+        const drainage = document.querySelector('#editHotBoxSpecificFields input[name="water_drainage"]:checked')?.value;
+
+        const count = [level, sealing, cracking, drainage].filter(Boolean).length;
+        const badge = document.getElementById('editHotboxRecommendedBadge');
+
+        if (count < 4) {
+            if (badge) {
+                badge.className = 'badge bg-secondary-subtle text-secondary border border-secondary-subtle px-2.5 py-1 rounded-pill small';
+                badge.innerHTML = `<i class="bi bi-hourglass-split me-1"></i>${count}/4 {% translate "questions renseignées" %}`;
+            }
+            return;
+        }
 
         let recommended = 'compliant';
         let badgeText = '{% translate "Suggéré : Conforme" %}';
@@ -916,6 +945,34 @@ document.addEventListener('DOMContentLoaded', function() {
 
             alertDiv.classList.add('d-none');
             successDiv.classList.add('d-none');
+
+            // Vérification pour Hot Box : obliger à répondre consciemment aux 4 questions
+            const hotboxContainer = document.getElementById('editHotBoxSpecificFields');
+            if (hotboxContainer && !hotboxContainer.classList.contains('d-none')) {
+                const resSelected = editForm.querySelector('input[name="result_status"]:checked')?.value;
+                if (resSelected !== 'cancelled') {
+                    const level = editForm.querySelector('input[name="joint_level"]:checked')?.value;
+                    const sealing = editForm.querySelector('input[name="joint_sealing"]:checked')?.value;
+                    const cracking = editForm.querySelector('input[name="cracking"]:checked')?.value;
+                    const drainage = editForm.querySelector('input[name="water_drainage"]:checked')?.value;
+
+                    if (!level || !sealing || !cracking || !drainage) {
+                        alertDiv.textContent = "{% translate 'Veuillez répondre à chacun des 4 contrôles de la réparation Hot Box (Planéité, Joints, Fissuration, Évacuation des eaux).' %}";
+                        alertDiv.classList.remove('d-none');
+                        alertDiv.scrollIntoView({ behavior: 'smooth', block: 'center' });
+                        return;
+                    }
+                }
+            }
+
+            const resultStatus = editForm.querySelector('input[name="result_status"]:checked')?.value;
+            if (!resultStatus || resultStatus === 'pending') {
+                alertDiv.textContent = "{% translate 'Veuillez sélectionner le résultat de l’inspection.' %}";
+                alertDiv.classList.remove('d-none');
+                alertDiv.scrollIntoView({ behavior: 'smooth', block: 'center' });
+                return;
+            }
+
             submitBtn.disabled = true;
             spinner.classList.remove('d-none');
             icon.classList.add('d-none');
diff --git a/loko/inspections/tests.py b/loko/inspections/tests.py
index eb267a3..f7ad619 100644
--- a/loko/inspections/tests.py
+++ b/loko/inspections/tests.py
@@ -1850,19 +1850,30 @@ class PostInterventionDurabilityInspectionTestCase(TestCase):
         self.assertContains(resp, "Inspections de terrain")
 
     def test_hotbox_inspection_model_and_compute_status(self):
-        """Vérifie le modèle HotBoxInspection, le calcul de statut automatique et details_summary."""
+        """Vérifie le modèle HotBoxInspection sans valeur par défaut, le calcul de statut et details_summary."""
         intervention = self._create_finished_intervention()
         interv_ct = ContentType.objects.get_for_model(Intervention)
+        
+        # Création sans valeur par défaut
         hb = HotBoxInspection.objects.create(
             asset_content_type=interv_ct,
             asset_object_id=intervention.pk,
             inspector=self.user,
             inspection_date=timezone.now(),
-            joint_level='flush',
-            joint_sealing='good',
-            cracking='none',
-            water_drainage='good',
         )
+        self.assertIsNone(hb.joint_level)
+        self.assertIsNone(hb.joint_sealing)
+        self.assertIsNone(hb.cracking)
+        self.assertIsNone(hb.water_drainage)
+        self.assertFalse(hb.is_fully_evaluated)
+        self.assertIsNone(hb.compute_status())
+
+        # Renseignement complet conforme
+        hb.joint_level = 'flush'
+        hb.joint_sealing = 'good'
+        hb.cracking = 'none'
+        hb.water_drainage = 'good'
+        self.assertTrue(hb.is_fully_evaluated)
         self.assertEqual(hb.compute_status(), 'compliant')
         self.assertTrue(hb.is_hotbox_related)
         self.assertEqual(hb.detailed_inspection, hb)
@@ -1897,8 +1908,22 @@ class PostInterventionDurabilityInspectionTestCase(TestCase):
         intervention = self._create_finished_intervention()
         interv_ct = ContentType.objects.get_for_model(Intervention)
 
-        # 1. Création via create_inspection_api
         create_url = reverse('inspections:create_inspection_api')
+
+        # 1. Tentative de finalisation sans renseigner les 4 questions -> erreur 400
+        invalid_post = {
+            'content_type_id': interv_ct.id,
+            'object_id': intervention.pk,
+            'result_status': 'compliant',
+            'is_hotbox': 'true',
+            'joint_level': 'flush',
+            # joint_sealing, cracking, water_drainage manquants
+        }
+        resp_invalid = self.client.post(create_url, invalid_post)
+        self.assertEqual(resp_invalid.status_code, 400)
+        self.assertIn("Veuillez répondre à chacun des 4 contrôles", resp_invalid.json()['error'])
+
+        # 2. Création réussie avec les 4 réponses
         post_data = {
             'content_type_id': interv_ct.id,
             'object_id': intervention.pk,
@@ -1923,7 +1948,7 @@ class PostInterventionDurabilityInspectionTestCase(TestCase):
         self.assertEqual(hb_obj.cracking, 'minor')
         self.assertEqual(hb_obj.water_drainage, 'good')
 
-        # 2. Détail via get_inspection_detail_api
+        # 3. Détail via get_inspection_detail_api
         detail_url = reverse('inspections:get_inspection_detail_api', kwargs={'inspection_id': insp_id})
         resp_detail = self.client.get(detail_url)
         self.assertEqual(resp_detail.status_code, 200)
@@ -1934,9 +1959,10 @@ class PostInterventionDurabilityInspectionTestCase(TestCase):
         self.assertEqual(detail_data['cracking'], 'minor')
         self.assertIn("Contrôles visuels Hot Box", detail_data.get('details_html', ''))
 
-        # 3. Mise à jour via update_inspection_api
+        # 4. Mise à jour via update_inspection_api
         update_url = reverse('inspections:update_inspection_api', kwargs={'inspection_id': insp_id})
         update_data = {
+            'status': 'completed',
             'result_status': 'non_compliant',
             'joint_level': 'slight_bump_hollow',
             'joint_sealing': 'cracked',
diff --git a/loko/inspections/views.py b/loko/inspections/views.py
index 8a02273..678bc72 100644
--- a/loko/inspections/views.py
+++ b/loko/inspections/views.py
@@ -728,10 +728,16 @@ def create_inspection_api(request):
                 apply_sign_updates_to_asset=apply_changes,
             )
         elif is_hotbox:
-            joint_level = request.POST.get('joint_level') or 'flush'
-            joint_sealing = request.POST.get('joint_sealing') or 'good'
-            cracking = request.POST.get('cracking') or 'none'
-            water_drainage = request.POST.get('water_drainage') or 'good'
+            joint_level = request.POST.get('joint_level') or None
+            joint_sealing = request.POST.get('joint_sealing') or None
+            cracking = request.POST.get('cracking') or None
+            water_drainage = request.POST.get('water_drainage') or None
+
+            if result_status not in ('cancelled', 'pending') and not all([joint_level, joint_sealing, cracking, water_drainage]):
+                return JsonResponse({
+                    'success': False,
+                    'error': _("Veuillez répondre à chacun des 4 contrôles visuels de la réparation Hot Box (Planéité, Joints, Fissuration, Évacuation des eaux).")
+                }, status=400)
 
             inspection = HotBoxInspection(
                 asset_content_type=content_type,
@@ -954,14 +960,19 @@ def get_inspection_detail_api(request, inspection_id):
 
     elif isinstance(leaf, HotBoxInspection) or getattr(leaf, 'is_hotbox_related', False):
         data['is_hotbox'] = True
-        data['joint_level'] = getattr(leaf, 'joint_level', 'flush')
-        data['joint_level_display'] = str(leaf.get_joint_level_display()) if hasattr(leaf, 'get_joint_level_display') else ''
-        data['joint_sealing'] = getattr(leaf, 'joint_sealing', 'good')
-        data['joint_sealing_display'] = str(leaf.get_joint_sealing_display()) if hasattr(leaf, 'get_joint_sealing_display') else ''
-        data['cracking'] = getattr(leaf, 'cracking', 'none')
-        data['cracking_display'] = str(leaf.get_cracking_display()) if hasattr(leaf, 'get_cracking_display') else ''
-        data['water_drainage'] = getattr(leaf, 'water_drainage', 'good')
-        data['water_drainage_display'] = str(leaf.get_water_drainage_display()) if hasattr(leaf, 'get_water_drainage_display') else ''
+        jl = getattr(leaf, 'joint_level', None)
+        js = getattr(leaf, 'joint_sealing', None)
+        cr = getattr(leaf, 'cracking', None)
+        wd = getattr(leaf, 'water_drainage', None)
+        data['joint_level'] = jl or ''
+        data['joint_level_display'] = str(leaf.get_joint_level_display()) if jl and hasattr(leaf, 'get_joint_level_display') else ''
+        data['joint_sealing'] = js or ''
+        data['joint_sealing_display'] = str(leaf.get_joint_sealing_display()) if js and hasattr(leaf, 'get_joint_sealing_display') else ''
+        data['cracking'] = cr or ''
+        data['cracking_display'] = str(leaf.get_cracking_display()) if cr and hasattr(leaf, 'get_cracking_display') else ''
+        data['water_drainage'] = wd or ''
+        data['water_drainage_display'] = str(leaf.get_water_drainage_display()) if wd and hasattr(leaf, 'get_water_drainage_display') else ''
+        data['is_fully_evaluated'] = bool(jl and js and cr and wd)
 
     return JsonResponse(data)
 
@@ -1064,13 +1075,21 @@ def update_inspection_api(request, inspection_id):
                 inspection.apply_sign_updates_to_asset = (request.POST.get('apply_sign_updates_to_asset') == 'true')
         elif isinstance(inspection, HotBoxInspection):
             if 'joint_level' in request.POST:
-                inspection.joint_level = request.POST['joint_level']
+                inspection.joint_level = request.POST.get('joint_level') or None
             if 'joint_sealing' in request.POST:
-                inspection.joint_sealing = request.POST['joint_sealing']
+                inspection.joint_sealing = request.POST.get('joint_sealing') or None
             if 'cracking' in request.POST:
-                inspection.cracking = request.POST['cracking']
+                inspection.cracking = request.POST.get('cracking') or None
             if 'water_drainage' in request.POST:
-                inspection.water_drainage = request.POST['water_drainage']
+                inspection.water_drainage = request.POST.get('water_drainage') or None
+
+            # Si l'inspection est marquée réalisée / complétée, exiger la réponse aux 4 questions
+            if inspection.status == 'completed' and inspection.result_status not in ('cancelled', 'pending'):
+                if not all([inspection.joint_level, inspection.joint_sealing, inspection.cracking, inspection.water_drainage]):
+                    return JsonResponse({
+                        'success': False,
+                        'error': _("Veuillez répondre à chacun des 4 contrôles visuels de la réparation Hot Box (Planéité, Joints, Fissuration, Évacuation des eaux).")
+                    }, status=400)
 
         # Traitement des nouvelles pièces jointes / photos
         uploaded_files = request.FILES.getlist('photos') + request.FILES.getlist('documents') + request.FILES.getlist('files')