diff --git a/app/helpers/subproject_addresses_helper.rb b/app/helpers/subproject_addresses_helper.rb
index 900a5f8..11eaba5 100644
--- a/app/helpers/subproject_addresses_helper.rb
+++ b/app/helpers/subproject_addresses_helper.rb
@@ -1,5 +1,5 @@
 module SubprojectAddressesHelper
   def subproject_address_form_fields
-    [:streetname, :zipcode, :city, :country]
+    [:streetname, :zipcode, :city, :country, :subproject_id]
   end
 end
\ No newline at end of file
diff --git a/app/helpers/subprojects_helper.rb b/app/helpers/subprojects_helper.rb
index 8255392..8171be3 100644
--- a/app/helpers/subprojects_helper.rb
+++ b/app/helpers/subprojects_helper.rb
@@ -4,6 +4,6 @@ module SubprojectsHelper
   end
 
   def subproject_view_fields
-    [:subproject_name, :project, :client, :owner, :builder]
+    [:subproject_name, :project, :client, :owner, :builder, :subproject_address]
   end
 end
diff --git a/app/models/subproject.rb b/app/models/subproject.rb
index fb251f3..ad18443 100644
--- a/app/models/subproject.rb
+++ b/app/models/subproject.rb
@@ -1,13 +1,17 @@
 class Subproject < ApplicationRecord
   belongs_to :project
+  has_one :subproject_address, dependent: :destroy
 
   belongs_to :client, class_name: 'Client', optional: true
   belongs_to :owner, class_name: 'Client', optional: true
   belongs_to :builder, class_name: 'Client', optional: true
+  belongs_to :subproject_addresses, optional: true
 
   accepts_nested_attributes_for :client, reject_if: ->(attrs) { attrs['id'].present? || attrs.values.all?(&:blank?) }
   accepts_nested_attributes_for :owner,  reject_if: ->(attrs) { attrs['id'].present? || attrs.values.all?(&:blank?) }
   accepts_nested_attributes_for :builder, reject_if: ->(attrs) { attrs['id'].present? || attrs.values.all?(&:blank?) }
+  accepts_nested_attributes_for :subproject_addresses, allow_destroy: true, reject_if: ->(attrs) { attrs['id'].present? || attrs.values.all?(&:blank?) }
+
 
   validates :subproject_name, presence: true
   validate :client_presence_check
diff --git a/app/views/subproject_addresses/_subproject_address.erb b/app/views/subproject_addresses/_subproject_address.erb
index 48074fc..90cda58 100644
--- a/app/views/subproject_addresses/_subproject_address.erb
+++ b/app/views/subproject_addresses/_subproject_address.erb
@@ -19,4 +19,9 @@
     <%= subproject_address.country %>
   </p>
 
+  <p>
+    <strong>Subproject_ID:</strong>
+    <%= subproject_address.subproject_id %>
+  </p>
+
 </div>
diff --git a/app/views/subproject_addresses/show.html.erb b/app/views/subproject_addresses/show.html.erb
index 90871bf..cbac125 100644
--- a/app/views/subproject_addresses/show.html.erb
+++ b/app/views/subproject_addresses/show.html.erb
@@ -1,5 +1,9 @@
 <p style="color: green"><%= notice %></p>
 
+<% content_for :title, "Adresse" %>
+
+<h1>Adresse</h1>
+
 <%= render @subproject_address %>
 
 <div>
diff --git a/app/views/subprojects/_subproject.html.erb b/app/views/subprojects/_subproject.html.erb
index 4cf100d..e89d899 100644
--- a/app/views/subprojects/_subproject.html.erb
+++ b/app/views/subprojects/_subproject.html.erb
@@ -7,6 +7,10 @@
       <%= link_to value.name, project_path(value) %>
     <% elsif attrib == :client || attrib == :owner || attrib == :builder %>
       <%= link_to "#{value&.company_name} (#{value&.lastname}, #{value&.firstname})", client_path(value&.id) %>
+    <% elsif attrib == :subproject_address %>
+      <% if value.present? %>
+      <%= link_to "#{value.streetname}, #{value.zipcode} #{value.city}, #{value.country}", subproject_address_path(value) %>
+      <% end %>
     <% else %>
       <%= value.is_a?(Date) ? l(value) : value %>
     <% end %>
diff --git a/db/migrate/20250723134650_add_subproject_relation_to_subproject_addresses.rb b/db/migrate/20250723134650_add_subproject_relation_to_subproject_addresses.rb
new file mode 100644
index 0000000..c68b469
--- /dev/null
+++ b/db/migrate/20250723134650_add_subproject_relation_to_subproject_addresses.rb
@@ -0,0 +1,5 @@
+class AddSubprojectRelationToSubprojectAddresses < ActiveRecord::Migration[8.0]
+  def change
+    add_column :subproject_addresses, :subproject_id, :integer
+  end
+end
diff --git a/db/schema.rb b/db/schema.rb
index b6dae50..6b1758b 100644
--- a/db/schema.rb
+++ b/db/schema.rb
@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema[8.0].define(version: 2025_07_22_152542) do
+ActiveRecord::Schema[8.0].define(version: 2025_07_23_134650) do
   create_table "clients", force: :cascade do |t|
     t.string "company_name"
     t.string "firstname"
@@ -44,6 +44,7 @@ ActiveRecord::Schema[8.0].define(version: 2025_07_22_152542) do
     t.text "notes"
     t.datetime "created_at", null: false
     t.datetime "updated_at", null: false
+    t.integer "subproject_id"
   end
 
   create_table "subprojects", force: :cascade do |t|