diff --git a/README.md b/README.md
index 059f3fdf9..668d3409d 100644
--- a/README.md
+++ b/README.md
@@ -53,6 +53,7 @@ L'application tourne à l'adresse `http://localhost:3000`. Un utilisateur de tes
     AutoReceiveDossiersForProcedureJob.set(cron: "* * * * *").perform_later(procedure_declaratoire_id, Dossier.states.fetch(:en_instruction))
     FindDubiousProceduresJob.set(cron: "0 0 * * *").perform_later
     Administrateurs::ActivateBeforeExpirationJob.set(cron: "0 8 * * *").perform_later
+    WarnExpiringDossiersJob.set(cron: "0 0 1 * *").perform_later
 
 ## Mise à jour de l'application
 
diff --git a/app/jobs/warn_expiring_dossiers_job.rb b/app/jobs/warn_expiring_dossiers_job.rb
new file mode 100644
index 000000000..c20789133
--- /dev/null
+++ b/app/jobs/warn_expiring_dossiers_job.rb
@@ -0,0 +1,12 @@
+class WarnExpiringDossiersJob < ApplicationJob
+  queue_as :cron
+
+  def perform(*args)
+    expiring, expired = Dossier
+      .includes(:procedure)
+      .nearing_end_of_retention
+      .partition(&:retention_expired?)
+
+    AdministrationMailer.dossier_expiration_summary(expiring, expired).deliver_later
+  end
+end
diff --git a/app/mailers/administration_mailer.rb b/app/mailers/administration_mailer.rb
index e84f70cb6..36bb5d477 100644
--- a/app/mailers/administration_mailer.rb
+++ b/app/mailers/administration_mailer.rb
@@ -36,4 +36,22 @@ class AdministrationMailer < ApplicationMailer
     mail(to: EQUIPE_EMAIL,
       subject: subject)
   end
+
+  def dossier_expiration_summary(expiring_dossiers, expired_dossiers)
+    subject =
+      if expired_dossiers.present? && expiring_dossiers.present?
+        "Des dossiers ont dépassé leur délai de conservation, et d’autres en approchent"
+      elsif expired_dossiers.present?
+        "Des dossiers ont dépassé leur délai de conservation"
+      elsif expiring_dossiers.present?
+        "Des dossiers approchent de la fin de leur délai de conservation"
+      else
+        "Aucun dossier en fin de délai de conservation"
+      end
+
+    @expiring_dossiers = expiring_dossiers
+    @expired_dossiers = expired_dossiers
+
+    mail(to: TECH_EMAIL, subject: subject)
+  end
 end
diff --git a/app/models/champs/number_champ.rb b/app/models/champs/number_champ.rb
index 8903284e2..8f3f089fd 100644
--- a/app/models/champs/number_champ.rb
+++ b/app/models/champs/number_champ.rb
@@ -1,2 +1,6 @@
 class Champs::NumberChamp < Champ
+  validates :value, numericality: { message: Proc.new { |champ, _| "#{champ.libelle} doit être un nombre" } }
+  validates :value,
+    numericality: { only_integer: true, message: Proc.new { |champ, _| "#{champ.libelle} doit être un nombre entier" } },
+    if: Proc.new{ |object| object.errors.empty? }
 end
diff --git a/app/models/dossier.rb b/app/models/dossier.rb
index 48ab975db..ef4ad39b6 100644
--- a/app/models/dossier.rb
+++ b/app/models/dossier.rb
@@ -61,6 +61,7 @@ class Dossier < ApplicationRecord
   scope :without_followers,           -> { left_outer_joins(:follows).where(follows: { id: nil }) }
   scope :followed_by,                 -> (gestionnaire) { joins(:follows).where(follows: { gestionnaire: gestionnaire }) }
   scope :with_champs,                 -> { includes(champs: :type_de_champ) }
+  scope :nearing_end_of_retention,    -> (duration = '1 month') { joins(:procedure).where("en_instruction_at + (duree_conservation_dossiers_dans_ds * interval '1 month') - now() < interval ?", duration) }
 
   accepts_nested_attributes_for :individual
 
@@ -182,6 +183,16 @@ class Dossier < ApplicationRecord
     brouillon? || en_construction?
   end
 
+  def retention_end_date
+    if instruction_commencee?
+      en_instruction_at + procedure.duree_conservation_dossiers_dans_ds.months
+    end
+  end
+
+  def retention_expired?
+    instruction_commencee? && retention_end_date <= DateTime.now
+  end
+
   def text_summary
     if brouillon?
       parts = [
diff --git a/app/views/administration_mailer/dossier_expiration_summary.html.haml b/app/views/administration_mailer/dossier_expiration_summary.html.haml
new file mode 100644
index 000000000..dc9488ca3
--- /dev/null
+++ b/app/views/administration_mailer/dossier_expiration_summary.html.haml
@@ -0,0 +1,22 @@
+- content_for(:title, 'Expiration du délai de conservation des dossiers')
+
+- if @expired_dossiers.present?
+  %h1= t('mail.administration.dossier_expiration_summary.expired_dossiers', count: @expired_dossiers.count)
+  - @expired_dossiers.group_by(&:procedure).each do |procedure, dossiers|
+    %dl
+      %dt
+        #{procedure.libelle} (#{link_to(procedure.id, manager_procedure_url(procedure))}) :
+      %dd
+        = dossiers.map { |d| link_to(d.id, manager_dossier_url(d)) }.join(', ').html_safe
+
+- if @expiring_dossiers.present?
+  %h1= t('mail.administration.dossier_expiration_summary.expiring_dossiers', count: @expiring_dossiers.count)
+  - @expiring_dossiers.group_by(&:procedure).each do |procedure, dossiers|
+    %dl
+      %dt
+        #{procedure.libelle} (#{link_to(procedure.id, manager_procedure_url(procedure))}) :
+      %dd
+        = dossiers.map { |d| link_to(d.id, manager_dossier_url(d)) }.join(', ').html_safe
+
+- if @expired_dossiers.empty? && @expiring_dossiers.empty?
+  Il n’y a pas de dossier expiré ou sur le point d’expirer.
diff --git a/app/views/new_gestionnaire/dossiers/print.html.haml b/app/views/new_gestionnaire/dossiers/print.html.haml
index 9bcb22e0d..4e0c5e62f 100644
--- a/app/views/new_gestionnaire/dossiers/print.html.haml
+++ b/app/views/new_gestionnaire/dossiers/print.html.haml
@@ -43,7 +43,7 @@
         %td
           - pj = @dossier.retrieve_last_piece_justificative_by_type(type_de_piece_justificative.id)
           - if pj.present?
-            Pièce fournie
+            #{pj.original_filename}
           - else
             Pièce non fournie
 
diff --git a/app/views/new_user/dossiers/brouillon.html.haml b/app/views/new_user/dossiers/brouillon.html.haml
index 77dec858b..03296a576 100644
--- a/app/views/new_user/dossiers/brouillon.html.haml
+++ b/app/views/new_user/dossiers/brouillon.html.haml
@@ -3,9 +3,8 @@
 - content_for :footer do
   = render partial: "new_user/dossiers/dossier_footer", locals: { dossier: @dossier }
 
-.dossier-edit
-  .dossier-header.sub-header
-    .container
-      = render partial: "shared/dossiers/header", locals: { dossier: @dossier, apercu: false }
+.dossier-header.sub-header
+  .container
+    = render partial: "shared/dossiers/header", locals: { dossier: @dossier, apercu: false }
 
-  = render partial: "shared/dossiers/edit", locals: { dossier: @dossier, apercu: false }
+= render partial: "shared/dossiers/edit", locals: { dossier: @dossier, apercu: false }
diff --git a/app/views/shared/dossiers/_edit.html.haml b/app/views/shared/dossiers/_edit.html.haml
index dec841f67..9dc1faa5d 100644
--- a/app/views/shared/dossiers/_edit.html.haml
+++ b/app/views/shared/dossiers/_edit.html.haml
@@ -1,4 +1,4 @@
-.container
+.dossier-edit.container
   = render partial: "shared/dossiers/submit_is_over", locals: { dossier: dossier }
 
   - if apercu
diff --git a/config/locales/fr.yml b/config/locales/fr.yml
index 638b058ab..444191bca 100644
--- a/config/locales/fr.yml
+++ b/config/locales/fr.yml
@@ -36,6 +36,16 @@ fr:
   apipie:
     api_documentation: "Documentation de l'API demarches-simplifiees.fr"
 
+  mail:
+    administration:
+      dossier_expiration_summary:
+        expired_dossiers:
+          one: "Un dossier a passé sa date limite de conservation"
+          other: "%{count} dossiers ont passé leur date limite de conservation"
+        expiring_dossiers:
+          one: "Un dossier est sur le point de passer sa date limite de conservation"
+          other: "%{count} dossiers sont sur le point de passer leur date limite de conservation"
+
   modal:
     publish:
       title:
@@ -142,7 +152,9 @@ fr:
               taken: déjà utilisé
             password:
               too_short: ': Le mot de passe est trop court'
-
+    attributes:
+      champs:
+        value: Le champ
   errors:
     messages:
       already_confirmed: "a déjà été validé(e), veuillez essayer de vous connecter"
diff --git a/config/locales/models/type_de_champ/fr.yml b/config/locales/models/type_de_champ/fr.yml
index aa6a33b41..655429494 100644
--- a/config/locales/models/type_de_champ/fr.yml
+++ b/config/locales/models/type_de_champ/fr.yml
@@ -9,7 +9,7 @@ fr:
           textarea: 'Zone de texte'
           date: 'Date'
           datetime: 'Date et Heure'
-          number: 'Nombre'
+          number: 'Nombre entier'
           checkbox: 'Case à cocher'
           civilite: 'Civilité'
           email: 'Email'
diff --git a/lib/tasks/2018_08_31_monthly_dossier_expiration_summary.rake b/lib/tasks/2018_08_31_monthly_dossier_expiration_summary.rake
new file mode 100644
index 000000000..7eadfff34
--- /dev/null
+++ b/lib/tasks/2018_08_31_monthly_dossier_expiration_summary.rake
@@ -0,0 +1,7 @@
+require Rails.root.join("lib", "tasks", "task_helper")
+
+namespace :'2018_08_31_monthly_dossier_expiration_summary' do
+  task enable: :environment do
+    WarnExpiringDossiersJob.set(cron: "0 0 1 * *").perform_later
+  end
+end
diff --git a/spec/factories/dossier.rb b/spec/factories/dossier.rb
index 8c2fe14fa..7449915f8 100644
--- a/spec/factories/dossier.rb
+++ b/spec/factories/dossier.rb
@@ -80,7 +80,7 @@ FactoryBot.define do
     trait :en_construction do
       after(:create) do |dossier, _evaluator|
         dossier.state = Dossier.states.fetch(:en_construction)
-        dossier.en_construction_at = dossier.created_at + 1.minute
+        dossier.en_construction_at ||= dossier.created_at + 1.minute
         dossier.save!
       end
     end
@@ -88,8 +88,8 @@ FactoryBot.define do
     trait :en_instruction do
       after(:create) do |dossier, _evaluator|
         dossier.state = Dossier.states.fetch(:en_instruction)
-        dossier.en_construction_at = dossier.created_at + 1.minute
-        dossier.created_at = dossier.created_at + 2.minutes
+        dossier.en_construction_at ||= dossier.created_at + 1.minute
+        dossier.en_instruction_at ||= dossier.en_construction_at + 1.minute
         dossier.save!
       end
     end
@@ -97,9 +97,9 @@ FactoryBot.define do
     trait :accepte do
       after(:create) do |dossier, _evaluator|
         dossier.state = Dossier.states.fetch(:accepte)
-        dossier.processed_at ||= dossier.created_at + 1.minute
-        dossier.en_construction_at ||= dossier.created_at + 2.minutes
-        dossier.created_at ||= dossier.created_at + 3.minutes
+        dossier.en_construction_at ||= dossier.created_at + 1.minute
+        dossier.en_instruction_at ||= dossier.en_construction_at + 1.minute
+        dossier.processed_at ||= dossier.en_instruction_at + 1.minute
         dossier.save!
       end
     end
@@ -107,9 +107,9 @@ FactoryBot.define do
     trait :refuse do
       after(:create) do |dossier, _evaluator|
         dossier.state = Dossier.states.fetch(:refuse)
-        dossier.processed_at = dossier.created_at + 1.minute
-        dossier.en_construction_at = dossier.created_at + 2.minutes
-        dossier.created_at = dossier.created_at + 3.minutes
+        dossier.en_construction_at ||= dossier.created_at + 1.minute
+        dossier.en_instruction_at ||= dossier.en_construction_at + 1.minute
+        dossier.processed_at ||= dossier.en_instruction_at + 1.minute
         dossier.save!
       end
     end
@@ -117,9 +117,9 @@ FactoryBot.define do
     trait :sans_suite do
       after(:create) do |dossier, _evaluator|
         dossier.state = Dossier.states.fetch(:sans_suite)
-        dossier.processed_at = dossier.created_at + 1.minute
-        dossier.en_construction_at = dossier.created_at + 2.minutes
-        dossier.created_at = dossier.created_at + 3.minutes
+        dossier.en_construction_at ||= dossier.created_at + 1.minute
+        dossier.en_instruction_at ||= dossier.en_construction_at + 1.minute
+        dossier.processed_at ||= dossier.en_instruction_at + 1.minute
         dossier.save!
       end
     end
diff --git a/spec/jobs/auto_receive_dossiers_for_procedure_job_spec.rb b/spec/jobs/auto_receive_dossiers_for_procedure_job_spec.rb
index 99c58c1d9..e7fa7b6f4 100644
--- a/spec/jobs/auto_receive_dossiers_for_procedure_job_spec.rb
+++ b/spec/jobs/auto_receive_dossiers_for_procedure_job_spec.rb
@@ -3,12 +3,15 @@ require 'rails_helper'
 RSpec.describe AutoReceiveDossiersForProcedureJob, type: :job do
   describe "perform" do
     let(:date) { Time.utc(2017, 9, 1, 10, 5, 0) }
+    let(:instruction_date) { date + 120 }
+
+    before do
+      Timecop.freeze(date)
+      AutoReceiveDossiersForProcedureJob.new.perform(procedure_id, state)
+    end
 
-    before { Timecop.freeze(date) }
     after { Timecop.return }
 
-    subject { AutoReceiveDossiersForProcedureJob.new.perform(procedure_id, state) }
-
     context "with some dossiers" do
       let(:nouveau_dossier1) { create(:dossier, :en_construction) }
       let(:nouveau_dossier2) { create(:dossier, :en_construction, procedure: nouveau_dossier1.procedure) }
@@ -19,43 +22,37 @@ RSpec.describe AutoReceiveDossiersForProcedureJob, type: :job do
       context "en_construction" do
         let(:state) { Dossier.states.fetch(:en_instruction) }
 
-        it do
-          subject
-          expect(nouveau_dossier1.reload.en_instruction?).to be true
-          expect(nouveau_dossier1.reload.en_instruction_at).to eq(date)
+        it { expect(nouveau_dossier1.reload.en_instruction?).to be true }
+        it { expect(nouveau_dossier1.reload.en_instruction_at).to eq(date) }
 
-          expect(nouveau_dossier2.reload.en_instruction?).to be true
-          expect(nouveau_dossier2.reload.en_instruction_at).to eq(date)
+        it { expect(nouveau_dossier2.reload.en_instruction?).to be true }
+        it { expect(nouveau_dossier2.reload.en_instruction_at).to eq(date) }
 
-          expect(dossier_recu.reload.en_instruction?).to be true
-          expect(dossier_recu.reload.en_instruction_at).to eq(date)
+        it { expect(dossier_recu.reload.en_instruction?).to be true }
+        it { expect(dossier_recu.reload.en_instruction_at).to eq(instruction_date) }
 
-          expect(dossier_brouillon.reload.brouillon?).to be true
-          expect(dossier_brouillon.reload.en_instruction_at).to eq(nil)
-        end
+        it { expect(dossier_brouillon.reload.brouillon?).to be true }
+        it { expect(dossier_brouillon.reload.en_instruction_at).to eq(nil) }
       end
 
       context "accepte" do
         let(:state) { Dossier.states.fetch(:accepte) }
 
-        it do
-          subject
-          expect(nouveau_dossier1.reload.accepte?).to be true
-          expect(nouveau_dossier1.reload.en_instruction_at).to eq(date)
-          expect(nouveau_dossier1.reload.processed_at).to eq(date)
+        it { expect(nouveau_dossier1.reload.accepte?).to be true }
+        it { expect(nouveau_dossier1.reload.en_instruction_at).to eq(date) }
+        it { expect(nouveau_dossier1.reload.processed_at).to eq(date) }
 
-          expect(nouveau_dossier2.reload.accepte?).to be true
-          expect(nouveau_dossier2.reload.en_instruction_at).to eq(date)
-          expect(nouveau_dossier2.reload.processed_at).to eq(date)
+        it { expect(nouveau_dossier2.reload.accepte?).to be true }
+        it { expect(nouveau_dossier2.reload.en_instruction_at).to eq(date) }
+        it { expect(nouveau_dossier2.reload.processed_at).to eq(date) }
 
-          expect(dossier_recu.reload.en_instruction?).to be true
-          expect(dossier_recu.reload.en_instruction_at).to eq(date)
-          expect(dossier_recu.reload.processed_at).to eq(nil)
+        it { expect(dossier_recu.reload.en_instruction?).to be true }
+        it { expect(dossier_recu.reload.en_instruction_at).to eq(instruction_date) }
+        it { expect(dossier_recu.reload.processed_at).to eq(nil) }
 
-          expect(dossier_brouillon.reload.brouillon?).to be true
-          expect(dossier_brouillon.reload.en_instruction_at).to eq(nil)
-          expect(dossier_brouillon.reload.processed_at).to eq(nil)
-        end
+        it { expect(dossier_brouillon.reload.brouillon?).to be true }
+        it { expect(dossier_brouillon.reload.en_instruction_at).to eq(nil) }
+        it { expect(dossier_brouillon.reload.processed_at).to eq(nil) }
       end
     end
   end
diff --git a/spec/mailers/administration_mailer_spec.rb b/spec/mailers/administration_mailer_spec.rb
index 49c39479c..9c009be48 100644
--- a/spec/mailers/administration_mailer_spec.rb
+++ b/spec/mailers/administration_mailer_spec.rb
@@ -33,4 +33,36 @@ RSpec.describe AdministrationMailer, type: :mailer do
 
     it { expect(subject.subject).not_to be_empty }
   end
+
+  describe '#dossier_expiration_summary' do
+    subject { described_class.dossier_expiration_summary(expiring, expired) }
+
+    context 'with expiring dossiers only' do
+      let(:expiring) { [create(:dossier)] }
+      let(:expired) { [] }
+
+      it { expect(subject.subject).to eq("Des dossiers approchent de la fin de leur délai de conservation") }
+    end
+
+    context 'with expired dossiers only' do
+      let(:expiring) { [] }
+      let(:expired) { [create(:dossier)] }
+
+      it { expect(subject.subject).to eq("Des dossiers ont dépassé leur délai de conservation") }
+    end
+
+    context 'with both expiring and expired dossiers' do
+      let(:expiring) { [create(:dossier)] }
+      let(:expired) { [create(:dossier)] }
+
+      it { expect(subject.subject).to eq("Des dossiers ont dépassé leur délai de conservation, et d’autres en approchent") }
+    end
+
+    context 'with neither expiring nor expired dossiers' do
+      let(:expiring) { [] }
+      let(:expired) { [] }
+
+      it { expect(subject.subject).to eq("Aucun dossier en fin de délai de conservation") }
+    end
+  end
 end
diff --git a/spec/models/dossier_spec.rb b/spec/models/dossier_spec.rb
index 17a75bf2d..f2a1be974 100644
--- a/spec/models/dossier_spec.rb
+++ b/spec/models/dossier_spec.rb
@@ -27,6 +27,32 @@ describe Dossier do
     end
   end
 
+  describe 'nearing_end_of_retention' do
+    let(:procedure) { create(:procedure, duree_conservation_dossiers_dans_ds: 6) }
+    let!(:young_dossier) { create(:dossier, procedure: procedure) }
+    let!(:expiring_dossier) { create(:dossier, :en_instruction, en_instruction_at: 170.days.ago, procedure: procedure) }
+    let!(:just_expired_dossier) { create(:dossier, :en_instruction, en_instruction_at: (6.months + 1.second).ago, procedure: procedure) }
+    let!(:long_expired_dossier) { create(:dossier, :en_instruction, en_instruction_at: 1.year.ago, procedure: procedure) }
+
+    context 'with default delay to end of retention' do
+      subject { Dossier.nearing_end_of_retention }
+
+      it { is_expected.not_to include(young_dossier) }
+      it { is_expected.to include(expiring_dossier) }
+      it { is_expected.to include(just_expired_dossier) }
+      it { is_expected.to include(long_expired_dossier) }
+    end
+
+    context 'with custom delay to end of retention' do
+      subject { Dossier.nearing_end_of_retention('0') }
+
+      it { is_expected.not_to include(young_dossier) }
+      it { is_expected.not_to include(expiring_dossier) }
+      it { is_expected.to include(just_expired_dossier) }
+      it { is_expected.to include(long_expired_dossier) }
+    end
+  end
+
   describe 'methods' do
     let(:dossier) { create(:dossier, :with_entreprise, user: user) }
     let(:etablissement) { dossier.etablissement }
@@ -976,4 +1002,30 @@ describe Dossier do
       it { is_expected.to be false }
     end
   end
+
+  context "retention date" do
+    let(:procedure) { create(:procedure, duree_conservation_dossiers_dans_ds: 6) }
+    let(:uninstructed_dossier) { create(:dossier, :en_construction, procedure: procedure) }
+    let(:young_dossier) { create(:dossier, :en_instruction, en_instruction_at: DateTime.now, procedure: procedure) }
+    let(:just_expired_dossier) { create(:dossier, :en_instruction, en_instruction_at: 6.months.ago, procedure: procedure) }
+    let(:long_expired_dossier) { create(:dossier, :en_instruction, en_instruction_at: 1.year.ago, procedure: procedure) }
+    let(:modif_date) { DateTime.parse('01/01/2100') }
+
+    before { Timecop.freeze(modif_date) }
+    after { Timecop.return }
+
+    describe "#retention_end_date" do
+      it { expect(uninstructed_dossier.retention_end_date).to be_nil }
+      it { expect(young_dossier.retention_end_date).to eq(6.months.from_now) }
+      it { expect(just_expired_dossier.retention_end_date).to eq(DateTime.now) }
+      it { expect(long_expired_dossier.retention_end_date).to eq(6.months.ago) }
+    end
+
+    describe "#retention_expired?" do
+      it { expect(uninstructed_dossier).not_to be_retention_expired }
+      it { expect(young_dossier).not_to be_retention_expired }
+      it { expect(just_expired_dossier).to be_retention_expired }
+      it { expect(long_expired_dossier).to be_retention_expired }
+    end
+  end
 end