diff --git a/app/models/procedure.rb b/app/models/procedure.rb
index 62f7707fc..5d153ab9f 100644
--- a/app/models/procedure.rb
+++ b/app/models/procedure.rb
@@ -1,4 +1,6 @@
 class Procedure < ApplicationRecord
+  MAX_DUREE_CONSERVATION = 36
+
   has_many :types_de_piece_justificative, -> { order "order_place ASC" }, dependent: :destroy
   has_many :types_de_champ, -> { public_only }, dependent: :destroy
   has_many :types_de_champ_private, -> { private_only }, class_name: 'TypeDeChamp', dependent: :destroy
@@ -47,6 +49,11 @@ class Procedure < ApplicationRecord
   validates :libelle, presence: true, allow_blank: false, allow_nil: false
   validates :description, presence: true, allow_blank: false, allow_nil: false
   validate :check_juridique
+  # FIXME: remove duree_conservation_required flag once all procedures are converted to the new style
+  validates :duree_conservation_dossiers_dans_ds, allow_nil: false, numericality: { only_integer: true, greater_than_or_equal_to: 1, less_than_or_equal_to: MAX_DUREE_CONSERVATION }, if: :durees_conservation_required
+  validates :duree_conservation_dossiers_hors_ds, allow_nil: false, numericality: { only_integer: true, greater_than_or_equal_to: 0 }, if: :durees_conservation_required
+  validates :duree_conservation_dossiers_dans_ds, allow_nil: true, numericality: { only_integer: true, greater_than_or_equal_to: 1, less_than_or_equal_to: MAX_DUREE_CONSERVATION }, unless: :durees_conservation_required
+  validates :duree_conservation_dossiers_hors_ds, allow_nil: true, numericality: { only_integer: true, greater_than_or_equal_to: 0 }, unless: :durees_conservation_required
 
   before_save :update_juridique_required
 
diff --git a/config/locales/fr.yml b/config/locales/fr.yml
index a78529b1e..5dede0967 100644
--- a/config/locales/fr.yml
+++ b/config/locales/fr.yml
@@ -88,6 +88,7 @@ fr:
     errors:
       messages:
         blank: "doit être rempli"
+        not_a_number: 'doit être un nombre'
       models:
         attestation_template:
           attributes:
diff --git a/config/locales/models/procedure/fr.yml b/config/locales/models/procedure/fr.yml
index 1066ffc86..9f6898e1d 100644
--- a/config/locales/models/procedure/fr.yml
+++ b/config/locales/models/procedure/fr.yml
@@ -3,3 +3,5 @@ fr:
     attributes:
       procedure:
         organisation: Organisme
+        duree_conservation_dossiers_dans_ds: Durée de conservation des dossiers sur demarches-simplifiees.fr
+        duree_conservation_dossiers_hors_ds: Durée de conservation des dossiers hors demarches-simplifiees.fr
diff --git a/spec/factories/procedure.rb b/spec/factories/procedure.rb
index 2ef30a635..b24fb1563 100644
--- a/spec/factories/procedure.rb
+++ b/spec/factories/procedure.rb
@@ -10,6 +10,8 @@ FactoryBot.define do
     published_at nil
     cerfa_flag false
     administrateur { create(:administrateur) }
+    duree_conservation_dossiers_dans_ds 3
+    duree_conservation_dossiers_hors_ds 6
 
     after(:build) do |procedure, _evaluator|
       if procedure.module_api_carto.nil?
diff --git a/spec/models/procedure_spec.rb b/spec/models/procedure_spec.rb
index c09e823c1..38c36fb2b 100644
--- a/spec/models/procedure_spec.rb
+++ b/spec/models/procedure_spec.rb
@@ -199,6 +199,38 @@ describe Procedure do
 
       it { expect(procedure.valid?).to eq(true) }
     end
+
+    shared_examples 'duree de conservation' do
+      context 'duree_conservation_required it true, the field gets validated' do
+        before { subject.durees_conservation_required = true }
+
+        it { is_expected.not_to allow_value(nil).for(field_name) }
+        it { is_expected.not_to allow_value('').for(field_name) }
+        it { is_expected.not_to allow_value('trois').for(field_name) }
+        it { is_expected.to allow_value(3).for(field_name) }
+      end
+
+      context 'duree_conservation_required is false, the field doesn’t get validated' do
+        before { subject.durees_conservation_required = false }
+
+        it { is_expected.to allow_value(nil).for(field_name) }
+        it { is_expected.to allow_value('').for(field_name) }
+        it { is_expected.not_to allow_value('trois').for(field_name) }
+        it { is_expected.to allow_value(3).for(field_name) }
+      end
+    end
+
+    describe 'duree de conservation dans ds' do
+      let(:field_name) { :duree_conservation_dossiers_dans_ds }
+
+      it_behaves_like 'duree de conservation'
+    end
+
+    describe 'duree de conservation hors ds' do
+      let(:field_name) { :duree_conservation_dossiers_hors_ds }
+
+      it_behaves_like 'duree de conservation'
+    end
   end
 
   describe '#types_de_champ_ordered' do