diff --git a/app/mailers/expert_mailer.rb b/app/mailers/expert_mailer.rb
new file mode 100644
index 000000000..a2bf99251
--- /dev/null
+++ b/app/mailers/expert_mailer.rb
@@ -0,0 +1,24 @@
+class ExpertMailer < ApplicationMailer
+  helper MailerHelper
+  layout 'mailers/layout'
+
+  def send_dossier_decision(avis_id)
+    @avis = Avis.eager_load(:dossier).find(avis_id)
+    @dossier = @avis.dossier
+    email = @avis.expert.email
+    @decision = decision_dossier(@dossier)
+    subject = "Dossier n° #{@dossier.id} a été #{@decision} - #{@dossier.procedure.libelle}"
+
+    mail(to: email, subject: subject)
+  end
+end
+
+def decision_dossier(dossier)
+  if dossier.accepte?
+    'accepté'
+  elsif dossier.sans_suite?
+    'classé sans suite'
+  elsif dossier.refuse?
+    'refusé'
+  end
+end
diff --git a/app/models/dossier.rb b/app/models/dossier.rb
index 095fd0755..a0add0355 100644
--- a/app/models/dossier.rb
+++ b/app/models/dossier.rb
@@ -647,6 +647,7 @@ class Dossier < ApplicationRecord
     save!
     remove_titres_identite!
     NotificationMailer.send_closed_notification(self).deliver_later
+    send_dossier_decision_to_experts(self)
     log_dossier_operation(instructeur, :accepter, self)
   end
 
@@ -674,6 +675,7 @@ class Dossier < ApplicationRecord
     save!
     remove_titres_identite!
     NotificationMailer.send_refused_notification(self).deliver_later
+    send_dossier_decision_to_experts(self)
     log_dossier_operation(instructeur, :refuser, self)
   end
 
@@ -687,6 +689,7 @@ class Dossier < ApplicationRecord
     save!
     remove_titres_identite!
     NotificationMailer.send_without_continuation_notification(self).deliver_later
+    send_dossier_decision_to_experts(self)
     log_dossier_operation(instructeur, :classer_sans_suite, self)
   end
 
@@ -941,4 +944,21 @@ class Dossier < ApplicationRecord
         DossierMailer.notify_brouillon_not_submitted(dossier).deliver_later
       end
   end
+
+  def send_dossier_decision_to_experts(dossier)
+    avis_experts_procedures_ids = Avis
+      .joins(:experts_procedure)
+      .where(dossier: dossier, experts_procedures: { allow_decision_access: true })
+      .with_answer
+      .distinct
+      .pluck('avis.id, experts_procedures.id')
+
+    # rubocop:disable Lint/UnusedBlockArgument
+    avis_ids = avis_experts_procedures_ids
+      .uniq { |(avis_id, experts_procedures_id)| experts_procedures_id }
+      .map { |(avis_id, _)| avis_id }
+    # rubocop:enable Lint/UnusedBlockArgument
+
+    avis_ids.each { |avis_id| ExpertMailer.send_dossier_decision(avis_id).deliver_later }
+  end
 end
diff --git a/app/views/expert_mailer/send_dossier_decision.html.haml b/app/views/expert_mailer/send_dossier_decision.html.haml
new file mode 100644
index 000000000..fce9c7b5b
--- /dev/null
+++ b/app/views/expert_mailer/send_dossier_decision.html.haml
@@ -0,0 +1,20 @@
+- avis_link = expert_avis_url(@dossier.procedure, @avis)
+%p
+  Bonjour,
+
+%p
+  Une décision a été rendue sur le dossier n°
+  %strong= @dossier.id
+  et ce dossier a préalablement reçu votre avis.
+%p
+  Le dossier a été
+  = succeed '.' do
+    %strong= @decision
+
+%p
+  Pour plus d'informations, cliquez sur le lien ci-dessous :
+
+%p
+  = round_button("Voir le dossier", avis_link, :primary)
+
+= render partial: "layouts/mailers/signature"
diff --git a/spec/mailers/previews/expert_mailer_preview.rb b/spec/mailers/previews/expert_mailer_preview.rb
new file mode 100644
index 000000000..c161114e3
--- /dev/null
+++ b/spec/mailers/previews/expert_mailer_preview.rb
@@ -0,0 +1,11 @@
+class AvisMailerPreview < ActionMailer::Preview
+  def send_dossier_decision
+    procedure = Procedure.new(libelle: 'Démarche pour faire des marches')
+    dossier = Dossier.new(id: 1, procedure: procedure)
+    instructeur = Instructeur.new(id: 1, user: User.new(email: 'jeanmichel.de-chauvigny@exemple.fr'))
+    expert = Expert.new(id: 1, user: User.new('moussa.kanga@exemple.fr'))
+    experts_procedure = ExpertsProcedure.new(expert: expert, procedure: procedure, allow_decision_access: true)
+    avis = Avis.new(id: 1, email: 'test@exemple.fr', dossier: dossier, claimant: instructeur, experts_procedure: experts_procedure)
+    ExpertMailer.send_dossier_decision(avis.id)
+  end
+end