diff --git a/src/components/ProfileType/ProfileTypeFormMultiChoice.tsx b/src/components/ProfileType/ProfileTypeFormMultiChoice.tsx
index 60ff6609caf94f75a16197172a25bc109c4a387e..1924a877d52b7955f3af21d9ddbda75375c98668 100644
--- a/src/components/ProfileType/ProfileTypeFormMultiChoice.tsx
+++ b/src/components/ProfileType/ProfileTypeFormMultiChoice.tsx
@@ -89,7 +89,9 @@ const ProfileTypeFormMultiChoice: React.FC<ProfileTypeFormMultiChoiceProps> = ({
             `profile_type.${ProfileTypeStepForm[step].toLowerCase()}.question`
           )}
         </div>
-        <span>{t('profile_type.multi_choices')}</span>
+        <span className="profile-question-hint">
+          {t('profile_type.multi_choices')}
+        </span>
         {answerType.choices.map(
           (value: ProfileTypeAnswerChoices, index: number) => {
             return value ? (
diff --git a/src/components/ProfileType/profileTypeForm.scss b/src/components/ProfileType/profileTypeForm.scss
index c7a487fadbe90a59c59f3f096b9f1fc28d8aaf5c..62dd76b00aca103ddb641f5004fc4bf21ef0ef11 100644
--- a/src/components/ProfileType/profileTypeForm.scss
+++ b/src/components/ProfileType/profileTypeForm.scss
@@ -13,19 +13,27 @@
   line-height: 150%;
   padding: 1rem 0;
 }
-
+.profile-question-hint {
+  font-size: 1rem;
+  color: $grey-bright;
+  display: block;
+  margin-bottom: 1rem;
+  font-style: italic;
+}
 .profile-question-answers {
   display: flex;
 }
-.profile-question-answers-radio-long  {
+.profile-question-answers-radio-long {
   flex-wrap: wrap;
 }
 
 .profile-question-answers-other {
   flex-direction: column;
 }
-.radio_short, .radio_long, .checkbox {
-  background: linear-gradient(180deg, #323339 0%, #25262B 100%);
+.radio_short,
+.radio_long,
+.checkbox {
+  background: linear-gradient(180deg, #323339 0%, #25262b 100%);
   box-shadow: 0px 4px 16px rgba(0, 0, 0, 0.55);
   margin: 0.5rem 0;
   display: flex;
@@ -52,44 +60,52 @@
     border-radius: 1px;
   }
 }
-.radio_short, .checkbox {
-  padding: 1.2rem;   
-  border-radius: 4px; 
+.radio_short,
+.checkbox {
+  padding: 1.2rem;
+  border-radius: 4px;
 }
 .radio_long {
-  padding: .5rem 1rem;   
-  border-radius: 20px; 
+  padding: 0.5rem 1rem;
+  border-radius: 4px;
   text-align: center;
 }
 .answer-checked {
-  background: radial-gradient(105.25% 64.58% at 49.68% 70.83%, rgba(226, 137, 4, 0.5) 0%, rgba(255, 255, 255, 0) 100%), #F1C017;
+  background: radial-gradient(
+      105.25% 64.58% at 49.68% 70.83%,
+      rgba(226, 137, 4, 0.5) 0%,
+      rgba(255, 255, 255, 0) 100%
+    ),
+    #f1c017;
   color: $dark-light-2;
   input {
-    &:before, &:after {
-    content: '';
-    position: absolute;
-    display: inline-block;
-    background: $gold-shadow;
-    border-radius: 0.5rem;
-  }
-  &:before {
-    width: 3px;
-    height: 12px;
-    left: 10px;
-    top: 4px;
-    transform: rotate(41deg);
-  }
-  &:after {
-    width: 3px;
-    height: 6px;
-    left: 5px;
-    top: 8px;
-    transform: rotate(133deg);
+    &:before,
+    &:after {
+      content: '';
+      position: absolute;
+      display: inline-block;
+      background: $gold-shadow;
+      border-radius: 0.5rem;
+    }
+    &:before {
+      width: 3px;
+      height: 12px;
+      left: 10px;
+      top: 4px;
+      transform: rotate(41deg);
+    }
+    &:after {
+      width: 3px;
+      height: 6px;
+      left: 5px;
+      top: 8px;
+      transform: rotate(133deg);
+    }
   }
-  }  
 }
 
-.text, .number {
+.text,
+.number {
   font-size: 1.25rem;
   input {
     margin: 0.5rem;
@@ -124,9 +140,9 @@
   margin: 0.5rem;
 
   &:focus {
-    outline:none;
+    outline: none;
   }
 }
 button:disabled {
   opacity: 0.5;
-}
\ No newline at end of file
+}
diff --git a/src/constants/consumptionConstants/electricSpecific.json b/src/constants/consumptionConstants/electricSpecific.json
index 0e5bf5ddf7863ef29185716049e238993391b967..86968545b046c8466cde29e61440f29b08f56234 100644
--- a/src/constants/consumptionConstants/electricSpecific.json
+++ b/src/constants/consumptionConstants/electricSpecific.json
@@ -4,13 +4,15 @@
     "between_1948_and_1974": 3130,
     "between_1975_and_1989": 2900,
     "between_1990_and_1998": 3230,
-    "after_1999": 2900
+    "after_1999": 2900,
+    "unknown": 2900
   },
   "appartment": {
     "before_1948": 1120,
     "between_1948_and_1974": 1880,
     "between_1975_and_1989": 1780,
     "between_1990_and_1998": 1670,
-    "after_1999": 2060
+    "after_1999": 2060,
+    "unknown": 1780
   }
 }
diff --git a/src/constants/consumptionConstants/heating.json b/src/constants/consumptionConstants/heating.json
index 1bfd6996204431ddb5536bb03bd4b4860337cb98..a4c49b014fb37664d9edf0675f4d68e70e9aa15d 100644
--- a/src/constants/consumptionConstants/heating.json
+++ b/src/constants/consumptionConstants/heating.json
@@ -5,14 +5,16 @@
       "between_1948_and_1974": 184,
       "between_1975_and_1989": 140,
       "between_1990_and_1998": 129,
-      "after_1999": 106
+      "after_1999": 106,
+      "unknown": 140
     },
     "appartment": {
       "before_1948": 119,
       "between_1948_and_1974": 150,
       "between_1975_and_1989": 105,
       "between_1990_and_1998": 73,
-      "after_1999": 74
+      "after_1999": 74,
+      "unknown": 105
     }
   },
   "adjustment_outisde_facing_walls": {
@@ -87,6 +89,16 @@
       "window_replacement_and_roof_insulation": 0,
       "roof_and_wall_insulation": 0,
       "window_replacement_and_roof_and_wall_insulation": 0
+    },
+    "unknown": {
+      "none": 0,
+      "roof_insulation": 0,
+      "window_replacement": -0.06,
+      "wall_insulation": -0.2,
+      "window_replacement_and_wall_insulation": -0.25,
+      "window_replacement_and_roof_insulation": -0.07,
+      "roof_and_wall_insulation": -0.2,
+      "window_replacement_and_roof_and_wall_insulation": -0.25
     }
   },
   "adjustment_facilities": {
diff --git a/src/enum/profileType.enum.ts b/src/enum/profileType.enum.ts
index be91724175e06405f086cc525586bf83f623cd2c..76b288f4292631fceb458b71828fe8baf43f1ca5 100644
--- a/src/enum/profileType.enum.ts
+++ b/src/enum/profileType.enum.ts
@@ -22,6 +22,7 @@ export enum ConstructionYear {
   BETWEEN_1975_AND_1989 = 'between_1975_and_1989',
   BETWEEN_1990_AND_1998 = 'between_1990_and_1998',
   AFTER_1999 = 'after_1999',
+  UNKNOWN = 'unknown',
 }
 
 export enum IndividualOrCollective {
diff --git a/src/locales/fr.json b/src/locales/fr.json
index 46515581c570f754fa07573c477e03ec17976577..597d69db5966ced0bc3e2b9ce58eb638bc44a246 100644
--- a/src/locales/fr.json
+++ b/src/locales/fr.json
@@ -428,7 +428,8 @@
       "between_1948_and_1974": "Entre 1975 et 1989",
       "between_1975_and_1989": "Entre 1975 et 1989",
       "between_1990_and_1998": "Entre 1990 et 1998",
-      "after_1999": "Après 1999"
+      "after_1999": "Après 1999",
+      "unknown": "Je ne sais pas"
     },
     "area": {
       "title": "Surface",
@@ -440,7 +441,11 @@
     },
     "outside_facing_walls": {
       "title": "Murs extérieurs",
-      "question": "Combien de façades donnent sur l'extérieur ?"
+      "question": "Combien de façades donnent sur l’extérieur ?",
+      "1": "1 façade",
+      "2": "2 façades",
+      "3": "3 façades",
+      "4": "4 façades"
     },
     "floor": {
       "title": "Étage",
@@ -474,7 +479,7 @@
     },
     "ventilation": {
       "title": "Ventilation double flux",
-      "question": "Etes-vous équipé d'une ventialtion double flux ?",
+      "question": "Etes-vous équipé d'une ventilation double flux ?",
       "yes": "Oui",
       "no": "Non",
       "unknown": "Je ne sais pas"
diff --git a/src/services/profileType.service.ts b/src/services/profileType.service.ts
index 3a9cf3f90427bc3aa827ba2607cd5b0badefced1..756b76654c8436a3afa372dd0acae96dd4c2dab4 100644
--- a/src/services/profileType.service.ts
+++ b/src/services/profileType.service.ts
@@ -591,9 +591,9 @@ export default class ProfileTypeService {
         }
       case ProfileTypeStepForm.OUTSIDE_FACING_WALLS:
         return {
-          type: ProfileTypeFormType.NUMBER_SELECTION,
+          type: ProfileTypeFormType.SINGLE_CHOICE,
           attribute: 'outsideFacingWalls',
-          choices: [1, 2, 3, 4],
+          choices: Object.values(OutsideFacingWalls),
         }
       case ProfileTypeStepForm.FLOOR:
         return {
diff --git a/test/__mocks__/profileType.mock.ts b/test/__mocks__/profileType.mock.ts
index 6c8d1907ad3eb766b30548a89ab147db563c8723..7fcdccf9c0c67a3ac35f798fa4d9e4b5d251c807 100644
--- a/test/__mocks__/profileType.mock.ts
+++ b/test/__mocks__/profileType.mock.ts
@@ -299,9 +299,9 @@ export const mockProfileTypeAnswers: ProfileTypeAnswer[] = [
     choices: Object.values(ConstructionYear),
   },
   {
-    type: ProfileTypeFormType.NUMBER_SELECTION,
+    type: ProfileTypeFormType.SINGLE_CHOICE,
     attribute: 'outsideFacingWalls',
-    choices: [1, 2, 3, 4],
+    choices: Object.values(OutsideFacingWalls),
   },
   {
     type: ProfileTypeFormType.SINGLE_CHOICE,