diff --git a/.rubocop.yml b/.rubocop.yml
index 8007fd868..354ef3d74 100644
--- a/.rubocop.yml
+++ b/.rubocop.yml
@@ -661,6 +661,9 @@ Rails/ApplicationRecord:
 Rails/Blank:
   Enabled: true
 
+Rails/BulkChangeTable:
+  Enabled: false
+
 Rails/CreateTableWithTimestamps:
   Enabled: false
 
@@ -792,6 +795,9 @@ Security/Open:
 Security/YAMLLoad:
   Enabled: true
 
+Style/AccessModifierDeclarations:
+  Enabled: false
+
 Style/Alias:
   Enabled: false
 
diff --git a/Gemfile.lock b/Gemfile.lock
index e2eae1d09..7434d95f7 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -88,7 +88,7 @@ GEM
       sass-rails (~> 5.0)
       selectize-rails (~> 0.6)
     aes_key_wrap (1.0.1)
-    apipie-rails (0.5.8)
+    apipie-rails (0.5.9)
       rails (>= 4.1)
     arel (9.0.0)
     ast (2.4.0)
@@ -107,7 +107,7 @@ GEM
       sass (>= 3.3.4)
     bootstrap-wysihtml5-rails (0.3.3.8)
       railties (>= 3.0)
-    brakeman (4.3.0)
+    brakeman (4.3.1)
     browser (2.5.3)
     builder (3.2.3)
     byebug (10.0.2)
@@ -133,7 +133,7 @@ GEM
     carrierwave-i18n (0.2.0)
     case_transform (0.2)
       activesupport
-    chartkick (2.3.4)
+    chartkick (2.3.5)
     childprocess (0.8.0)
       ffi (~> 1.0, >= 1.0.11)
     chunky_png (1.3.10)
@@ -167,10 +167,11 @@ GEM
     delayed_job_active_record (4.1.3)
       activerecord (>= 3.0, < 5.3)
       delayed_job (>= 3.0, < 5)
-    delayed_job_web (1.4.2)
+    delayed_job_web (1.4.3)
       activerecord (> 3.0.0)
       delayed_job (> 2.0.3)
-      sinatra (>= 2.0.1)
+      rack-protection (>= 1.5.5)
+      sinatra (>= 1.4.4)
     devise (4.4.3)
       bcrypt (~> 3.0)
       orm_adapter (~> 0.1)
@@ -183,9 +184,9 @@ GEM
     diff-lcs (1.3)
     domain_name (0.5.20170404)
       unf (>= 0.0.5, < 1.0.0)
-    dotenv (2.4.0)
-    dotenv-rails (2.4.0)
-      dotenv (= 2.4.0)
+    dotenv (2.5.0)
+    dotenv-rails (2.5.0)
+      dotenv (= 2.5.0)
       railties (>= 3.2, < 6.0)
     draper (3.0.1)
       actionpack (~> 5.0)
@@ -201,9 +202,9 @@ GEM
     ethon (0.11.0)
       ffi (>= 1.3.0)
     eventmachine (1.2.7)
-    excon (0.60.0)
+    excon (0.62.0)
     execjs (2.7.0)
-    factory_bot (4.8.2)
+    factory_bot (4.10.0)
       activesupport (>= 3.0.0)
     faraday (0.12.2)
       multipart-post (>= 1.2, < 3)
@@ -299,13 +300,13 @@ GEM
     fog-joyent (0.0.1)
       fog-core (~> 1.42)
       fog-json (>= 1.0)
-    fog-json (1.0.2)
-      fog-core (~> 1.0)
+    fog-json (1.2.0)
+      fog-core
       multi_json (~> 1.10)
     fog-local (0.4.0)
       fog-core (~> 1.27)
-    fog-openstack (0.1.24)
-      fog-core (~> 1.40)
+    fog-openstack (0.1.27)
+      fog-core (~> 1.45.0)
       fog-json (>= 1.0)
       ipaddress (>= 0.8)
     fog-ovirt (0.1.3)
@@ -420,6 +421,7 @@ GEM
       concurrent-ruby (~> 1.0)
     inflecto (0.0.2)
     ipaddress (0.8.3)
+    jaro_winkler (1.5.1)
     jquery-rails (4.3.3)
       rails-dom-testing (>= 1, < 3)
       railties (>= 4.2.0)
@@ -490,7 +492,7 @@ GEM
     nenv (0.3.0)
     netrc (0.11.0)
     nio4r (2.3.1)
-    nokogiri (1.8.2)
+    nokogiri (1.8.4)
       mini_portile2 (~> 2.3.0)
     notiffany (0.1.1)
       nenv (~> 0.1)
@@ -521,15 +523,15 @@ GEM
       validate_email
       validate_url
       webfinger (>= 1.0.1)
-    openstack (3.3.18)
+    openstack (3.3.20)
       json
     orm_adapter (0.5.0)
     parallel (1.12.1)
-    parser (2.5.1.0)
+    parser (2.5.1.2)
       ast (~> 2.4.0)
     pdf-core (0.7.0)
     pg (1.0.0)
-    powerpack (0.1.1)
+    powerpack (0.1.2)
     prawn (2.2.2)
       pdf-core (~> 0.7.0)
       ttfunk (~> 1.5)
@@ -561,7 +563,7 @@ GEM
       httpclient
       json-jwt (>= 1.9.0)
       rack
-    rack-protection (2.0.2)
+    rack-protection (2.0.3)
       rack
     rack-test (1.0.0)
       rack (>= 1.0, < 3)
@@ -649,11 +651,12 @@ GEM
       rspec-mocks (~> 3.7.0)
       rspec-support (~> 3.7.0)
     rspec-support (3.7.1)
-    rspec_junit_formatter (0.3.0)
+    rspec_junit_formatter (0.4.1)
       rspec-core (>= 2, < 4, != 2.12.0)
-    rubocop (0.56.0)
+    rubocop (0.58.1)
+      jaro_winkler (~> 1.5.1)
       parallel (~> 1.10)
-      parser (>= 2.5)
+      parser (>= 2.5, != 2.5.1.1)
       powerpack (~> 0.1)
       rainbow (>= 2.2.2, < 4.0)
       ruby-progressbar (~> 1.7)
@@ -690,23 +693,23 @@ GEM
     selenium-webdriver (3.8.0)
       childprocess (~> 0.5)
       rubyzip (~> 1.0)
-    sentry-raven (2.7.3)
+    sentry-raven (2.7.4)
       faraday (>= 0.7.6, < 1.0)
     sexp_processor (4.11.0)
     shellany (0.0.1)
     shoulda-matchers (3.1.2)
       activesupport (>= 4.0.0)
-    simple_form (4.0.0)
-      actionpack (> 4)
-      activemodel (> 4)
-    sinatra (2.0.2)
+    simple_form (4.0.1)
+      actionpack (>= 5.0)
+      activemodel (>= 5.0)
+    sinatra (2.0.3)
       mustermann (~> 1.0)
       rack (~> 2.0)
-      rack-protection (= 2.0.2)
+      rack-protection (= 2.0.3)
       tilt (~> 2.0)
-    skylight (2.0.1)
-      skylight-core (= 2.0.1)
-    skylight-core (2.0.1)
+    skylight (2.0.2)
+      skylight-core (= 2.0.2)
+    skylight-core (2.0.2)
       activesupport (>= 4.2.0)
     smart_listing (1.2.2)
       coffee-rails
@@ -749,12 +752,12 @@ GEM
       ethon (>= 0.9.0)
     tzinfo (1.2.5)
       thread_safe (~> 0.1)
-    uglifier (4.1.10)
+    uglifier (4.1.15)
       execjs (>= 0.3.0, < 3)
     unf (0.1.4)
       unf_ext
     unf_ext (0.0.7.5)
-    unicode-display_width (1.3.2)
+    unicode-display_width (1.4.0)
     unicorn (5.4.0)
       kgio (~> 2.6)
       raindrops (~> 0.7)
@@ -773,7 +776,7 @@ GEM
     webfinger (1.1.0)
       activesupport
       httpclient (>= 2.4)
-    webmock (3.4.1)
+    webmock (3.4.2)
       addressable (>= 2.3.6)
       crack (>= 0.3.2)
       hashdiff
diff --git a/app/controllers/manager/users_controller.rb b/app/controllers/manager/users_controller.rb
index 4cde73804..9e59c1500 100644
--- a/app/controllers/manager/users_controller.rb
+++ b/app/controllers/manager/users_controller.rb
@@ -1,4 +1,17 @@
 module Manager
   class UsersController < Manager::ApplicationController
+    def resend_confirmation_instructions
+      user = User.find(params[:id])
+      user.resend_confirmation_instructions
+      flash[:notice] = "Le message de confirmation de l’adresse email a été renvoyé."
+      redirect_to manager_user_path(user)
+    end
+
+    def confirm
+      user = User.find(params[:id])
+      user.confirm
+      flash[:notice] = "L’adresse email de l’utilisateur a été marquée comme confirmée."
+      redirect_to manager_user_path(user)
+    end
   end
 end
diff --git a/app/controllers/new_gestionnaire/procedures_controller.rb b/app/controllers/new_gestionnaire/procedures_controller.rb
index d9584e5e0..48d53cdb3 100644
--- a/app/controllers/new_gestionnaire/procedures_controller.rb
+++ b/app/controllers/new_gestionnaire/procedures_controller.rb
@@ -356,7 +356,7 @@ module NewGestionnaire
         def last_page?
           current_page == total_pages
         end
-EVAL
+      EVAL
     end
   end
 end
diff --git a/app/controllers/new_user/dossiers_controller.rb b/app/controllers/new_user/dossiers_controller.rb
index 971c471dd..b94747c7e 100644
--- a/app/controllers/new_user/dossiers_controller.rb
+++ b/app/controllers/new_user/dossiers_controller.rb
@@ -1,8 +1,10 @@
 module NewUser
   class DossiersController < UserController
+    include DossierHelper
+
     helper_method :new_demarche_url
 
-    before_action :ensure_ownership!, except: [:index, :modifier, :update]
+    before_action :ensure_ownership!, except: [:index, :modifier, :update, :recherche]
     before_action :ensure_ownership_or_invitation!, only: [:modifier, :update]
     before_action :ensure_dossier_can_be_updated, only: [:update_identite, :update]
     before_action :forbid_invite_submission!, only: [:update]
@@ -114,6 +116,18 @@ module NewUser
       end
     end
 
+    def recherche
+      @dossier_id = params[:dossier_id]
+      dossier = current_user.dossiers.find_by(id: @dossier_id)
+
+      if dossier
+        redirect_to url_for_dossier(dossier)
+      else
+        flash.alert = "Vous n’avez pas de dossier avec le nº #{@dossier_id}."
+        redirect_to dossiers_path
+      end
+    end
+
     def new_demarche_url
       "https://doc.demarches-simplifiees.fr/listes-des-demarches"
     end
diff --git a/app/dashboards/user_dashboard.rb b/app/dashboards/user_dashboard.rb
index 19fcb2e54..c61cc424b 100644
--- a/app/dashboards/user_dashboard.rb
+++ b/app/dashboards/user_dashboard.rb
@@ -10,6 +10,7 @@ class UserDashboard < Administrate::BaseDashboard
   ATTRIBUTE_TYPES = {
     id: Field::Number,
     email: Field::String,
+    confirmed?: Field::Boolean,
     created_at: Field::DateTime,
     updated_at: Field::DateTime,
     current_sign_in_at: Field::DateTime,
@@ -32,6 +33,7 @@ class UserDashboard < Administrate::BaseDashboard
     :dossiers,
     :id,
     :email,
+    :confirmed?,
     :current_sign_in_at,
     :created_at,
   ].freeze
diff --git a/app/mailers/new_attestation_mailer.rb b/app/mailers/new_attestation_mailer.rb
index 70706316c..686fbb4af 100644
--- a/app/mailers/new_attestation_mailer.rb
+++ b/app/mailers/new_attestation_mailer.rb
@@ -21,7 +21,7 @@ class NewAttestationMailer < ApplicationMailer
 
       Suite à cette opération, l'attestation liée à votre dossier n'a pas été regénérée.
       Ce problème est désormais reglé, votre nouvelle attestation est disponible à l'adresse suivante :
-      #{dossier_attestation_url(dossier)}
+      #{attestation_dossier_url(dossier)}
 
       Cordialement,
 
diff --git a/app/mailers/resend_attestation_mailer.rb b/app/mailers/resend_attestation_mailer.rb
index f8a99855c..8be56fa00 100644
--- a/app/mailers/resend_attestation_mailer.rb
+++ b/app/mailers/resend_attestation_mailer.rb
@@ -17,7 +17,7 @@ class ResendAttestationMailer < ApplicationMailer
       L'attestation de votre dossier nº #{dossier.id} (procédure "#{dossier.procedure.libelle}") a été modifiée.
 
       Votre nouvelle attestation est disponible à l'adresse suivante :
-      #{dossier_attestation_url(dossier)}
+      #{attestation_dossier_url(dossier)}
 
       Cordialement,
 
diff --git a/app/models/concerns/tags_substitution_concern.rb b/app/models/concerns/tags_substitution_concern.rb
index d220f5f80..d40926856 100644
--- a/app/models/concerns/tags_substitution_concern.rb
+++ b/app/models/concerns/tags_substitution_concern.rb
@@ -53,7 +53,7 @@ module TagsSubstitutionConcern
     {
       libelle: 'lien attestation',
       description: '',
-      lambda: -> (d) { external_link(dossier_attestation_url(d)) },
+      lambda: -> (d) { external_link(attestation_dossier_url(d)) },
       available_for_states: ['accepte']
     }
   ]
diff --git a/app/views/dossiers/_attestation.html.haml b/app/views/dossiers/_attestation.html.haml
index 2aba8551e..da124abc7 100644
--- a/app/views/dossiers/_attestation.html.haml
+++ b/app/views/dossiers/_attestation.html.haml
@@ -12,6 +12,6 @@
           %p.title= dossier.attestation.title
           %p.delivery Délivrée le #{l(dossier.attestation.created_at, format: '%d %B %Y')}
         - if user_signed_in? && current_user == dossier.user
-          = link_to 'Télécharger', dossier_attestation_path(dossier), target: '_blank', class: 'btn btn-primary'
+          = link_to 'Télécharger', attestation_dossier_path(dossier), target: '_blank', class: 'btn btn-primary'
         - else
           = link_to 'Télécharger', attestation_gestionnaire_dossier_path(dossier.procedure, dossier), target: '_blank', class: 'btn btn-primary'
diff --git a/app/views/layouts/_new_header.haml b/app/views/layouts/_new_header.haml
index 25f715ee8..9a9af4624 100644
--- a/app/views/layouts/_new_header.haml
+++ b/app/views/layouts/_new_header.haml
@@ -47,6 +47,14 @@
               %button{ title: "Rechercher" }
                 = image_tag "icons/search-blue.svg"
 
+      - if nav_bar_profile == :user && user_signed_in? && current_user.dossiers.count > 2
+        %li
+          .header-search
+            = form_tag recherche_dossiers_path, method: :post, class: "form" do
+              = text_field_tag :dossier_id, "", placeholder: "Numéro de dossier"
+              %button{ title: "Rechercher" }
+                = image_tag "icons/search-blue.svg"
+
       - if gestionnaire_signed_in? || user_signed_in?
         %li
           .header-menu-opener
diff --git a/app/views/manager/users/show.html.erb b/app/views/manager/users/show.html.erb
new file mode 100644
index 000000000..c6a5f87be
--- /dev/null
+++ b/app/views/manager/users/show.html.erb
@@ -0,0 +1,57 @@
+<%#
+# Show
+
+This view is the template for the show page.
+It renders the attributes of a resource,
+as well as a link to its edit page.
+
+## Local variables:
+
+- `page`:
+  An instance of [Administrate::Page::Show][1].
+  Contains methods for accessing the resource to be displayed on the page,
+  as well as helpers for describing how each attribute of the resource
+  should be displayed.
+
+[1]: http://www.rubydoc.info/gems/administrate/Administrate/Page/Show
+%>
+
+<% content_for(:title) { t("administrate.actions.show_resource", name: page.page_title) } %>
+<% user = page.resource %>
+
+<header class="main-content__header" role="banner">
+  <h1 class="main-content__page-title">
+    <%= content_for(:title) %>
+  </h1>
+
+  <div>
+    <%= link_to(
+      t("administrate.actions.edit_resource", name: page.page_title),
+      [:edit, namespace, page.resource],
+      class: "button",
+    ) if valid_action?(:edit) && show_action?(:edit, page.resource) %>
+  </div>
+
+  <div>
+    <% if !user.confirmed? %>
+      <%= link_to('Renvoyer l’email de confirmation', [:resend_confirmation_instructions, namespace, page.resource], method: :post, class: 'button') %>
+      <%= link_to('Confirmer l’email', confirm_manager_user_path(user), method: :post, class: 'button') %>
+    <% end %>
+  <div>
+</header>
+
+<section class="main-content__body">
+  <dl>
+    <% page.attributes.each do |attribute| %>
+      <dt class="attribute-label" id="<%= attribute.name %>">
+      <%= t(
+        "helpers.label.#{resource_name}.#{attribute.name}",
+        default: attribute.name.titleize,
+      ) %>
+      </dt>
+
+      <dd class="attribute-data attribute-data--<%=attribute.html_class%>"
+          ><%= render_field attribute %></dd>
+    <% end %>
+  </dl>
+</section>
diff --git a/app/views/shared/dossiers/editable_champs/_siret.html.haml b/app/views/shared/dossiers/editable_champs/_siret.html.haml
index e875564cf..b67817792 100644
--- a/app/views/shared/dossiers/editable_champs/_siret.html.haml
+++ b/app/views/shared/dossiers/editable_champs/_siret.html.haml
@@ -1,7 +1,7 @@
 = form.text_field :value,
   placeholder: champ.libelle,
   class: 'small-margin',
-  data: { siret: champs_siret_path(format: :js, champ_id: champ) },
+  data: { siret: champ.persisted? ? champs_siret_path(format: :js, champ_id: champ) : nil },
   required: champ.mandatory?
 .spinner.right-spinner
 %div{ id: "etablissement-for-#{champ.id}" }
diff --git a/config/routes.rb b/config/routes.rb
index 9e0ca185a..663a9562f 100644
--- a/config/routes.rb
+++ b/config/routes.rb
@@ -15,7 +15,11 @@ Rails.application.routes.draw do
       put 'enable_feature', on: :member
     end
 
-    resources :users, only: [:index, :show]
+    resources :users, only: [:index, :show] do
+      post 'resend_confirmation_instructions', on: :member
+      post 'confirm', on: :member
+    end
+
     resources :gestionnaires, only: [:index, :show] do
       post 'reinvite', on: :member
     end
@@ -241,12 +245,16 @@ Rails.application.routes.draw do
         get 'modifier'
         get 'merci'
         post 'ask_deletion'
+        get 'attestation'
+      end
+
+      collection do
+        post 'recherche'
+        # FIXME: to remove when show is implemeted
+        # needed to fix refresh after dossier draft save
+        get ':id', to: redirect('/dossiers/%{id}/modifier')
       end
-      get 'attestation'
     end
-    # FIXME: to remove when show is implemeted
-    # needed to fix refresh after dossier draft save
-    get 'dossiers/:id', to: redirect('/dossiers/%{id}/modifier')
   end
 
   scope module: 'new_gestionnaire', as: 'gestionnaire' do
diff --git a/spec/controllers/new_user/dossiers_controller_spec.rb b/spec/controllers/new_user/dossiers_controller_spec.rb
index 17802c563..22c7ff106 100644
--- a/spec/controllers/new_user/dossiers_controller_spec.rb
+++ b/spec/controllers/new_user/dossiers_controller_spec.rb
@@ -111,7 +111,7 @@ describe NewUser::DossiersController, type: :controller do
             controller.head :ok
           end
 
-        get :attestation, params: { dossier_id: dossier.id }
+        get :attestation, params: { id: dossier.id }
         expect(response).to have_http_status(:success)
       end
     end
diff --git a/spec/features/users/list_dossiers_spec.rb b/spec/features/users/list_dossiers_spec.rb
index 8341291df..95e140763 100644
--- a/spec/features/users/list_dossiers_spec.rb
+++ b/spec/features/users/list_dossiers_spec.rb
@@ -65,4 +65,41 @@ describe 'user access to the list of his dossier' do
       expect(page).to have_content(CONTACT_EMAIL)
     end
   end
+
+  describe "recherche" do
+    context "when the dossier does not exist" do
+      before do
+        page.find_by_id('dossier_id').set(10000000)
+        click_button("Rechercher")
+      end
+
+      it "shows an error message on the dossiers page" do
+        expect(current_path).to eq(dossiers_path)
+        expect(page).to have_content("Vous n’avez pas de dossier avec le nº 10000000.")
+      end
+    end
+
+    context "when the dossier does not belong to the user" do
+      before do
+        page.find_by_id('dossier_id').set(dossier2.id)
+        click_button("Rechercher")
+      end
+
+      it "shows an error message on the dossiers page" do
+        expect(current_path).to eq(dossiers_path)
+        expect(page).to have_content("Vous n’avez pas de dossier avec le nº #{dossier2.id}.")
+      end
+    end
+
+    context "when the dossier belongs to the user" do
+      before do
+        page.find_by_id('dossier_id').set(dossier1.id)
+        click_button("Rechercher")
+      end
+
+      it "redirects to the dossier page" do
+        expect(current_path).to eq(users_dossier_recapitulatif_path(dossier1))
+      end
+    end
+  end
 end