diff --git a/app/controllers/admin/procedures_controller.rb b/app/controllers/admin/procedures_controller.rb
index 6532cc3a3..9016db63a 100644
--- a/app/controllers/admin/procedures_controller.rb
+++ b/app/controllers/admin/procedures_controller.rb
@@ -205,6 +205,20 @@ class Admin::ProceduresController < AdminController
     render json: json_path_list
   end
 
+  def check_availability
+    path = params[:procedure][:path]
+    procedure_id = params[:procedure][:id]
+
+    if procedure_id.present?
+      procedure = current_administrateur.procedures.find(procedure_id)
+      @available = procedure.path_available?(path)
+      @mine = procedure.path_is_mine?(path)
+    else
+      @available = !ProcedurePath.exists?(path: path)
+      @mine = ProcedurePath.mine?(current_administrateur, path)
+    end
+  end
+
   def delete_deliberation
     procedure = Procedure.find(params[:id])
 
diff --git a/app/models/procedure.rb b/app/models/procedure.rb
index 79f432ee6..1a4b33206 100644
--- a/app/models/procedure.rb
+++ b/app/models/procedure.rb
@@ -120,6 +120,14 @@ class Procedure < ApplicationRecord
     publiee_ou_archivee?
   end
 
+  def path_available?(path)
+    !ProcedurePath.where.not(procedure: self).exists?(path: path)
+  end
+
+  def path_is_mine?(path)
+    ProcedurePath.where.not(procedure: self).mine?(administrateur, path)
+  end
+
   # This method is needed for transition. Eventually this will be the same as brouillon?.
   def brouillon_avec_lien?
     Flipflop.publish_draft? && brouillon? && procedure_path.present?
diff --git a/app/models/procedure_path.rb b/app/models/procedure_path.rb
index 7bab10680..c6b6fb754 100644
--- a/app/models/procedure_path.rb
+++ b/app/models/procedure_path.rb
@@ -11,6 +11,11 @@ class ProcedurePath < ApplicationRecord
       .find_or_initialize_by(path: path).validate
   end
 
+  def self.mine?(administrateur, path)
+    procedure_path = find_by(path: path)
+    procedure_path && administrateur.owns?(procedure_path)
+  end
+
   def self.find_with_path(path)
     joins(:procedure)
       .where.not(procedures: { aasm_state: :archivee })
diff --git a/app/views/admin/procedures/_unavailable.html.haml b/app/views/admin/procedures/_unavailable.html.haml
new file mode 100644
index 000000000..dd3868512
--- /dev/null
+++ b/app/views/admin/procedures/_unavailable.html.haml
@@ -0,0 +1,8 @@
+- if mine
+  Ce lien est déjà utilisé par une de vos procédure.
+  %br
+  Si vous voulez l’utiliser, l’ancienne procédure sera archivée (plus accessible du public).
+- else
+  Ce lien est déjà utilisé par une procédure.
+  %br
+  Vous ne pouvez pas l’utiliser car il appartient à un autre administrateur.
diff --git a/app/views/admin/procedures/check_availability.js.erb b/app/views/admin/procedures/check_availability.js.erb
new file mode 100644
index 000000000..91c9a76ba
--- /dev/null
+++ b/app/views/admin/procedures/check_availability.js.erb
@@ -0,0 +1,11 @@
+<% if @available %>
+  <%= remove_element('.unavailable-path-message', inner: true) %>
+  <%= enable_element('button[type=submit]') %>
+<% else %>
+  <%= render_to_element('.unavailable-path-message', partial: 'unavailable', locals: { mine: @mine }) %>
+  <% if @mine %>
+    <%= enable_element('button[type=submit]') %>
+  <% else %>
+    <%= disable_element('button[type=submit]') %>
+  <% end %>
+<% end %>
diff --git a/config/routes.rb b/config/routes.rb
index 19adc8ed6..f440e3f6f 100644
--- a/config/routes.rb
+++ b/config/routes.rb
@@ -179,6 +179,7 @@ Rails.application.routes.draw do
     get 'procedures/archived' => 'procedures#archived'
     get 'procedures/draft' => 'procedures#draft'
     get 'procedures/path_list' => 'procedures#path_list'
+    get 'procedures/available' => 'procedures#check_availability'
     get 'profile' => 'profile#show', as: :profile
     post 'renew_api_token' => 'profile#renew_api_token', as: :renew_api_token
 
diff --git a/spec/controllers/admin/procedures_controller_spec.rb b/spec/controllers/admin/procedures_controller_spec.rb
index feb45dea2..caa042d7d 100644
--- a/spec/controllers/admin/procedures_controller_spec.rb
+++ b/spec/controllers/admin/procedures_controller_spec.rb
@@ -721,4 +721,52 @@ describe Admin::ProceduresController, type: :controller do
     it { expect(procedure.deliberation.attached?).to eq(false) }
     it { expect(response).to redirect_to(edit_admin_procedure_path(procedure)) }
   end
+
+  describe "GET #check_availability" do
+    render_views
+    let(:procedure) { create(:procedure, :with_path, administrateur: admin) }
+    let(:params) {
+      {
+        procedure: {
+          path: path,
+          id: procedure.id
+        }
+      }
+    }
+    let(:path) { generate(:published_path) }
+
+    before do
+      get :check_availability, params: params, format: 'js'
+    end
+
+    context 'self path' do
+      let(:path) { procedure.path }
+
+      it { expect(response.body).to include("innerHTML = ''") }
+    end
+
+    context 'available path' do
+      it { expect(response.body).to include("innerHTML = ''") }
+    end
+
+    context 'my path' do
+      let(:procedure_owned) { create(:procedure, :with_path, administrateur: admin) }
+      let(:path) { procedure_owned.path }
+
+      it {
+        expect(response.body).to include('Ce lien est déjà utilisé par une de vos procédure.')
+        expect(response.body).to include('Si vous voulez l’utiliser, l’ancienne procédure sera archivée')
+      }
+    end
+
+    context 'unavailable path' do
+      let(:procedure_not_owned) { create(:procedure, :with_path, administrateur: create(:administrateur)) }
+      let(:path) { procedure_not_owned.path }
+
+      it {
+        expect(response.body).to include('Ce lien est déjà utilisé par une procédure.')
+        expect(response.body).to include('Vous ne pouvez pas l’utiliser car il appartient à un autre administrateur.')
+      }
+    end
+  end
 end