diff --git a/app/controllers/users/dossiers_controller.rb b/app/controllers/users/dossiers_controller.rb
index f4c247b79..7369eaf78 100644
--- a/app/controllers/users/dossiers_controller.rb
+++ b/app/controllers/users/dossiers_controller.rb
@@ -148,6 +148,7 @@ module Users
 
     def brouillon
       @dossier = dossier_with_champs
+      # TODO: SEB show validation errors
 
       # TODO: remove when the champs are unifed
       if !@dossier.autorisation_donnees
@@ -303,6 +304,7 @@ module Users
       )
       dossier.build_default_individual
       dossier.save!
+      dossier.prefill!(PrefillParams.new(dossier, params).to_a)
 
       if dossier.procedure.for_individual
         redirect_to identite_dossier_path(dossier)
diff --git a/app/models/dossier.rb b/app/models/dossier.rb
index fc30676df..71c2aba8c 100644
--- a/app/models/dossier.rb
+++ b/app/models/dossier.rb
@@ -1226,6 +1226,12 @@ class Dossier < ApplicationRecord
     cloned_dossier
   end
 
+  def find_champ_by_stable_id(stable_id)
+    return nil if stable_id.blank?
+
+    champs_public.joins(:type_de_champ).find_by(types_de_champ: { stable_id: stable_id })
+  end
+
   private
 
   def create_missing_traitemets
diff --git a/spec/controllers/users/dossiers_controller_spec.rb b/spec/controllers/users/dossiers_controller_spec.rb
index a458f4d1f..2f2a4d0b5 100644
--- a/spec/controllers/users/dossiers_controller_spec.rb
+++ b/spec/controllers/users/dossiers_controller_spec.rb
@@ -1054,8 +1054,9 @@ describe Users::DossiersController, type: :controller do
   describe '#new' do
     let(:procedure) { create(:procedure, :published) }
     let(:procedure_id) { procedure.id }
+    let(:params) { { procedure_id: procedure_id } }
 
-    subject { get :new, params: { procedure_id: procedure_id } }
+    subject { get :new, params: params }
 
     it 'clears the stored procedure context' do
       subject
@@ -1085,6 +1086,34 @@ describe Users::DossiersController, type: :controller do
 
             it { is_expected.to redirect_to dossiers_path }
           end
+
+          context 'when prefill values are given' do
+            let!(:type_de_champ_1) { create(:type_de_champ_text, procedure: procedure) }
+            let(:value_1) { "any value" }
+
+            let!(:type_de_champ_2) { create(:type_de_champ_textarea, procedure: procedure) }
+            let(:value_2) { "another value" }
+
+            let(:params) {
+              {
+                procedure_id: procedure_id,
+                type_de_champ_1.to_typed_id => value_1,
+                type_de_champ_2.to_typed_id => value_2
+              }
+            }
+
+            it { expect { subject }.to change { Dossier.count }.by(1) }
+
+            it "prefills the dossier's champs with the given values" do
+              subject
+
+              dossier = Dossier.last
+              expect(dossier.find_champ_by_stable_id(type_de_champ_1.stable_id).value).to eq(value_1)
+              expect(dossier.find_champ_by_stable_id(type_de_champ_2.stable_id).value).to eq(value_2)
+            end
+
+            it { is_expected.to redirect_to siret_dossier_path(id: Dossier.last) }
+          end
         end
         context 'when user is not logged' do
           it { is_expected.to have_http_status(302) }
diff --git a/spec/models/dossier_spec.rb b/spec/models/dossier_spec.rb
index cba307b3e..f22296cee 100644
--- a/spec/models/dossier_spec.rb
+++ b/spec/models/dossier_spec.rb
@@ -1855,6 +1855,40 @@ describe Dossier do
     end
   end
 
+  describe "#find_champ_by_stable_id" do
+    let(:procedure) { create(:procedure, :published) }
+    let(:dossier) { create(:dossier, :brouillon, procedure: procedure) }
+
+    subject { dossier.find_champ_by_stable_id(stable_id) }
+
+    context 'when the stable id is missing' do
+      let(:stable_id) { nil }
+
+      it { expect(subject).to be_nil }
+    end
+
+    context 'when the stable id is blank' do
+      let(:stable_id) { "" }
+
+      it { expect(subject).to be_nil }
+    end
+
+    context 'when the stable id is present' do
+      context 'when the dossier has no champ with the given stable id' do
+        let(:stable_id) { 'My Neighbor Totoro is the best film ever' }
+
+        it { expect(subject).to be_nil }
+      end
+
+      context 'when the dossier has a champ with the given stable id' do
+        let!(:type_de_champ) { create(:type_de_champ_text, procedure: procedure) }
+        let(:stable_id) { type_de_champ.stable_id }
+
+        it { expect(subject).to eq(dossier.champs_public.joins(:type_de_champ).find_by(types_de_champ: { stable_id: stable_id })) }
+      end
+    end
+  end
+
   describe 'BatchOperation' do
     subject { build(:dossier) }
     it { is_expected.to belong_to(:batch_operation).optional }