diff --git a/app/assets/images/icons/close.svg b/app/assets/images/icons/refuse.svg
similarity index 100%
rename from app/assets/images/icons/close.svg
rename to app/assets/images/icons/refuse.svg
diff --git a/app/assets/stylesheets/new_design/icons.scss b/app/assets/stylesheets/new_design/icons.scss
index 40a1780c4..0dfbb1ec5 100644
--- a/app/assets/stylesheets/new_design/icons.scss
+++ b/app/assets/stylesheets/new_design/icons.scss
@@ -29,8 +29,8 @@
     background-image: image-url("icons/accept.svg");
   }
 
-  &.close {
-    background-image: image-url("icons/close.svg");
+  &.refuse {
+    background-image: image-url("icons/refuse.svg");
   }
 
   &.without-continuation {
diff --git a/app/controllers/backoffice/dossiers_controller.rb b/app/controllers/backoffice/dossiers_controller.rb
index 4a9412636..5acaa4fa8 100644
--- a/app/controllers/backoffice/dossiers_controller.rb
+++ b/app/controllers/backoffice/dossiers_controller.rb
@@ -101,7 +101,7 @@ class Backoffice::DossiersController < Backoffice::DossiersListController
     current_gestionnaire.follow(dossier)
     flash.notice = 'Dossier passé en instruction.'
 
-    redirect_to_dossier(dossier)
+    redirect_to backoffice_dossier_path(id: dossier.id)
   end
 
   def process_dossier
@@ -143,7 +143,7 @@ class Backoffice::DossiersController < Backoffice::DossiersListController
 
     NotificationMailer.send_notification(dossier, template, attestation_pdf).deliver_now!
 
-    redirect_to_dossier(dossier)
+    redirect_to backoffice_dossier_path(id: dossier.id)
   end
 
   def reload_smartlisting
@@ -182,19 +182,11 @@ class Backoffice::DossiersController < Backoffice::DossiersListController
     @facade.dossier.initiated!
     flash.notice = 'Dossier repassé en construction.'
 
-    redirect_to_dossier(@facade.dossier)
+    redirect_to backoffice_dossier_path(id: @facade.dossier.id)
   end
 
   private
 
-  def redirect_to_dossier(dossier)
-    if params[:new_ui] # TODO delete new_ui when old UI is no longer used
-      redirect_to dossier_path(dossier.procedure, dossier)
-    else
-      redirect_to backoffice_dossier_path(id: dossier.id)
-    end
-  end
-
   def check_attestation_emailable(dossier)
     if dossier&.attestation&.emailable? == false
       human_size = number_to_human_size(dossier.attestation.pdf.size)
diff --git a/app/controllers/new_gestionnaire/dossiers_controller.rb b/app/controllers/new_gestionnaire/dossiers_controller.rb
index d82d80407..a3c35a178 100644
--- a/app/controllers/new_gestionnaire/dossiers_controller.rb
+++ b/app/controllers/new_gestionnaire/dossiers_controller.rb
@@ -1,5 +1,6 @@
 module NewGestionnaire
   class DossiersController < ProceduresController
+    include ActionView::Helpers::NumberHelper
     include ActionView::Helpers::TextHelper
 
     def attestation
@@ -52,6 +53,59 @@ module NewGestionnaire
       redirect_back(fallback_location: procedures_url)
     end
 
+    def passer_en_instruction
+      dossier.received!
+      current_gestionnaire.follow(dossier)
+      flash.notice = 'Dossier passé en instruction.'
+
+      redirect_to dossier_path(procedure, dossier)
+    end
+
+    def repasser_en_construction
+      dossier.initiated!
+      flash.notice = 'Dossier repassé en construction.'
+
+      redirect_to dossier_path(procedure, dossier)
+    end
+
+    def terminer
+      if params[:dossier] && params[:dossier][:motivation].present?
+        motivation = params[:dossier][:motivation]
+      end
+
+      case params[:process_action]
+      when "refuser"
+        next_step = "refuse"
+        notice = "Dossier considéré comme refusé."
+        template = procedure.refused_mail_template
+      when "classer_sans_suite"
+        next_step = "without_continuation"
+        notice = "Dossier considéré comme sans suite."
+        template = procedure.without_continuation_mail_template
+      when "accepter"
+        next_step = "close"
+        notice = "Dossier traité avec succès."
+        template = procedure.closed_mail_template
+      end
+
+      dossier.next_step!('gestionnaire', next_step, motivation)
+
+      # needed to force Carrierwave to provide dossier.attestation.pdf.read
+      # when the Feature.remote_storage is true, otherwise pdf.read is a closed stream.
+      dossier.reload
+
+      attestation_pdf = nil
+      if check_attestation_emailable
+        attestation_pdf = dossier.attestation.pdf.read
+      end
+
+      flash.notice = notice
+
+      NotificationMailer.send_notification(dossier, template, attestation_pdf).deliver_now!
+
+      redirect_to dossier_path(procedure, dossier)
+    end
+
     def create_commentaire
       commentaire_hash = commentaire_params.merge(email: current_gestionnaire.email, dossier: dossier)
 
@@ -122,5 +176,15 @@ module NewGestionnaire
     def champs_private_params
       params.require(:dossier).permit(champs_private_attributes: [:id, :value, value: []])
     end
+
+    def check_attestation_emailable
+      if dossier&.attestation&.emailable? == false
+        human_size = number_to_human_size(dossier.attestation.pdf.size)
+        msg = "the attestation of the dossier #{dossier.id} cannot be mailed because it is too heavy: #{human_size}"
+        capture_message(msg, level: 'error')
+      end
+
+      dossier&.attestation&.emailable?
+    end
   end
 end
diff --git a/app/views/new_gestionnaire/dossiers/_state_button.html.haml b/app/views/new_gestionnaire/dossiers/_state_button.html.haml
index c1115697e..d7fa22108 100644
--- a/app/views/new_gestionnaire/dossiers/_state_button.html.haml
+++ b/app/views/new_gestionnaire/dossiers/_state_button.html.haml
@@ -10,7 +10,7 @@
               %h4 En construction
               Vous permettez à l'usager de modifier ses réponses au formulaire
           %li
-            = link_to backoffice_dossier_receive_path(dossier, new_ui: true), method: :post, data: { confirm: "Confirmer vous le passage en instruction de ce dossier ?" } do
+            = link_to passer_en_instruction_dossier_path(dossier.procedure, dossier), method: :post, data: { confirm: "Confirmer vous le passage en instruction de ce dossier ?" } do
               .icon.in-progress
               .description
                 %h4 Passer en instruction
@@ -18,7 +18,7 @@
 
         - if dossier.en_instruction?
           %li
-            = link_to backoffice_dossier_reopen_path(dossier, new_ui: true), method: :post, data: { confirm: "Confirmer vous la réouverture de ce dossier ?" } do
+            = link_to repasser_en_construction_dossier_path(dossier.procedure, dossier), method: :post, data: { confirm: "Confirmer vous le passage en construction de ce dossier ?" } do
               .icon.edit
               .description
                 %h4 Repasser en construction
@@ -38,14 +38,14 @@
             .description
               %h4 Classer sans suite
               L'usager ne recevra aucune notification
-          %li{ onclick: "TPS.showMotivation('close');" }
-            .icon.close
+          %li{ onclick: "TPS.showMotivation('refuse');" }
+            .icon.refuse
             .description
               %h4 Refuser
               L'usager sera notifié que son dossier a été refusé
-      = render partial: 'new_gestionnaire/dossiers/state_button_motivation', locals: { dossier: dossier, popup_title: 'Accepter le dossier',  popup_class: 'accept', process_action: 'close', title: 'Accepter', confirm: 'Accepter ce dossier ?' }
-      = render partial: 'new_gestionnaire/dossiers/state_button_motivation', locals: { dossier: dossier, popup_title: 'Classer le dossier sans suite', popup_class: 'without-continuation', process_action: 'without_continuation', title: 'Classer sans suite', confirm: 'Confirmer vous le classement sans suite de ce dossier ?' }
-      = render partial: 'new_gestionnaire/dossiers/state_button_motivation', locals: { dossier: dossier, popup_title: 'Refuser le dossier', popup_class: 'close', process_action: 'refuse', title: 'Refuser', confirm: 'Confirmer vous le refus de ce dossier ?' }
+      = render partial: 'new_gestionnaire/dossiers/state_button_motivation', locals: { dossier: dossier, popup_title: 'Accepter le dossier',  popup_class: 'accept', process_action: 'accepter', title: 'Accepter', confirm: 'Accepter ce dossier ?' }
+      = render partial: 'new_gestionnaire/dossiers/state_button_motivation', locals: { dossier: dossier, popup_title: 'Classer le dossier sans suite', popup_class: 'without-continuation', process_action: 'classer_sans_suite', title: 'Classer sans suite', confirm: 'Confirmer vous le classement sans suite de ce dossier ?' }
+      = render partial: 'new_gestionnaire/dossiers/state_button_motivation', locals: { dossier: dossier, popup_title: 'Refuser le dossier', popup_class: 'refuse', process_action: 'refuser', title: 'Refuser', confirm: 'Confirmer vous le refus de ce dossier ?' }
 
 - else
   - if dossier.motivation.present? || dossier.attestation.present?
diff --git a/app/views/new_gestionnaire/dossiers/_state_button_motivation.html.haml b/app/views/new_gestionnaire/dossiers/_state_button_motivation.html.haml
index 2dfadaaf0..8dc3e716b 100644
--- a/app/views/new_gestionnaire/dossiers/_state_button_motivation.html.haml
+++ b/app/views/new_gestionnaire/dossiers/_state_button_motivation.html.haml
@@ -3,7 +3,7 @@
     .icon{ class: popup_class }
     #{popup_title} nº #{dossier.id}
 
-  = form_tag(backoffice_dossier_process_dossier_url(dossier.id, new_ui: true), method: :post, class: 'form') do
+  = form_tag(terminer_dossier_path(dossier.procedure, dossier), method: :post, class: 'form') do
     = text_area :dossier, :motivation, class: 'motivation-text-area', placeholder: 'Rédigez votre motivation ici (facultative)'
     - if title == 'Accepter'
       %p.help
diff --git a/app/views/root/patron.html.haml b/app/views/root/patron.html.haml
index 3a86f8a2b..0b60bab49 100644
--- a/app/views/root/patron.html.haml
+++ b/app/views/root/patron.html.haml
@@ -8,7 +8,7 @@
     .icon.unarchive
     .icon.folder
     .icon.accept
-    .icon.close
+    .icon.refuse
     .icon.without-continuation
     .icon.edit
     .icon.in-progress
diff --git a/config/routes.rb b/config/routes.rb
index 9930412c5..3f83c1b52 100644
--- a/config/routes.rb
+++ b/config/routes.rb
@@ -254,6 +254,9 @@ Rails.application.routes.draw do
             patch 'unarchive'
             patch 'annotations' => 'dossiers#update_annotations'
             post 'commentaire' => 'dossiers#create_commentaire'
+            post 'passer-en-instruction' => 'dossiers#passer_en_instruction'
+            post 'repasser-en-construction' => 'dossiers#repasser_en_construction'
+            post 'terminer'
             scope :carte do
               get 'position'
             end
diff --git a/spec/controllers/new_gestionnaire/dossiers_controller_spec.rb b/spec/controllers/new_gestionnaire/dossiers_controller_spec.rb
index 9360189d8..d734b5c57 100644
--- a/spec/controllers/new_gestionnaire/dossiers_controller_spec.rb
+++ b/spec/controllers/new_gestionnaire/dossiers_controller_spec.rb
@@ -77,6 +77,156 @@ describe NewGestionnaire::DossiersController, type: :controller do
     it { expect(response).to redirect_to(procedures_url) }
   end
 
+  describe '#passer_en_instruction' do
+    before do
+      dossier.initiated!
+      sign_in gestionnaire
+      post :passer_en_instruction, params: { procedure_id: procedure.id, dossier_id: dossier.id }
+      dossier.reload
+    end
+
+    it { expect(dossier.state).to eq('received') }
+    it { is_expected.to redirect_to dossier_path(procedure, dossier) }
+    it { expect(gestionnaire.follow?(dossier)).to be true }
+  end
+
+  describe '#repasser_en_construction' do
+    before do
+      dossier.received!
+      sign_in gestionnaire
+    end
+
+    subject { post :repasser_en_construction, params: { procedure_id: procedure.id, dossier_id: dossier.id} }
+
+    it 'change state to initiated' do
+      subject
+
+      dossier.reload
+      expect(dossier.state).to eq('initiated')
+    end
+
+    it { is_expected.to redirect_to dossier_path(procedure, dossier) }
+  end
+
+  describe '#terminer' do
+    context "with refuser" do
+      before do
+        dossier.received!
+        sign_in gestionnaire
+      end
+
+      subject { post :terminer, params: { process_action: "refuser", procedure_id: procedure.id, dossier_id: dossier.id} }
+
+      it 'change state to refused' do
+        subject
+
+        dossier.reload
+        expect(dossier.state).to eq('refused')
+      end
+
+      it 'Notification email is sent' do
+        expect(NotificationMailer).to receive(:send_notification)
+          .with(dossier, kind_of(Mails::RefusedMail), nil).and_return(NotificationMailer)
+        expect(NotificationMailer).to receive(:deliver_now!)
+
+        subject
+      end
+
+      it { is_expected.to redirect_to redirect_to dossier_path(procedure, dossier) }
+    end
+
+    context "with classer_sans_suite" do
+      before do
+        dossier.received!
+        sign_in gestionnaire
+      end
+
+      subject { post :terminer, params: { process_action: "classer_sans_suite", procedure_id: procedure.id, dossier_id: dossier.id} }
+
+      it 'change state to without_continuation' do
+        subject
+
+        dossier.reload
+        expect(dossier.state).to eq('without_continuation')
+      end
+
+      it 'Notification email is sent' do
+        expect(NotificationMailer).to receive(:send_notification)
+          .with(dossier, kind_of(Mails::WithoutContinuationMail), nil).and_return(NotificationMailer)
+        expect(NotificationMailer).to receive(:deliver_now!)
+
+        subject
+      end
+
+      it { is_expected.to redirect_to redirect_to dossier_path(procedure, dossier) }
+    end
+
+    context "with accepter" do
+      let(:expected_attestation) { nil }
+
+      before do
+        dossier.received!
+        sign_in gestionnaire
+
+        expect(NotificationMailer).to receive(:send_notification)
+          .with(dossier, kind_of(Mails::ClosedMail), expected_attestation)
+          .and_return(NotificationMailer)
+
+        expect(NotificationMailer).to receive(:deliver_now!)
+      end
+
+      subject { post :terminer, params: { process_action: "accepter", procedure_id: procedure.id, dossier_id: dossier.id} }
+
+      it 'change state to closed' do
+        subject
+
+        dossier.reload
+        expect(dossier.state).to eq('closed')
+      end
+
+      context 'when the dossier does not have any attestation' do
+        it 'Notification email is sent' do
+          subject
+        end
+      end
+
+      context 'when the dossier has an attestation' do
+        before do
+          attestation = Attestation.new
+          allow(attestation).to receive(:pdf).and_return(double(read: 'pdf', size: 2.megabytes))
+          allow(attestation).to receive(:emailable?).and_return(emailable)
+
+          expect_any_instance_of(Dossier).to receive(:reload)
+          allow_any_instance_of(Dossier).to receive(:build_attestation).and_return(attestation)
+        end
+
+        context 'emailable' do
+          let(:emailable) { true }
+          let(:expected_attestation) { 'pdf' }
+
+          it 'Notification email is sent with the attestation' do
+            subject
+
+            is_expected.to redirect_to redirect_to dossier_path(procedure, dossier)
+          end
+        end
+
+        context 'when the dossier has an attestation not emailable' do
+          let(:emailable) { false }
+          let(:expected_attestation) { nil }
+
+          it 'Notification email is sent without the attestation' do
+            expect(controller).to receive(:capture_message)
+
+            subject
+
+            is_expected.to redirect_to redirect_to dossier_path(procedure, dossier)
+          end
+        end
+      end
+    end
+  end
+
   describe '#show #messagerie #annotations_privees #avis' do
     before do
       dossier.notifications = %w(champs annotations_privees avis commentaire).map{ |type| Notification.create!(type_notif: type) }