diff --git a/app/controllers/subproject_addresses_controller.rb b/app/controllers/subproject_addresses_controller.rb
new file mode 100644
index 0000000..5fa93a0
--- /dev/null
+++ b/app/controllers/subproject_addresses_controller.rb
@@ -0,0 +1,49 @@
+class SubprojectAddressesController < ApplicationController
+  before_action :set_subproject_address, only: %i[show edit update destroy]
+
+  def index
+    @subproject_addresses = SubprojectAddress.all
+  end
+
+  def show
+  end
+
+  def new
+    @subproject_address = SubprojectAddress.new
+  end
+
+  def edit
+  end
+
+  def create
+    @subproject_address = SubprojectAddress.new(subproject_address_params)
+    if @subproject_address.save
+      redirect_to @subproject_address, notice: "Adresse was successfully created."
+    else
+      render :new, status: :unprocessable_entity
+    end
+  end
+
+  def update
+    if @subproject_address.update(subproject_address_params)
+      redirect_to @subproject_address, notice: "Adresse was successfully updated."
+    else
+      render :edit, status: :unprocessable_entity
+    end
+  end
+
+  def destroy
+    @subproject_address.destroy
+    redirect_to subproject_addresses_url, notice: "Adresse was successfully destroyed."
+  end
+
+  private
+
+  def set_subproject_address
+    @subproject_address = SubprojectAddress.find(params[:id])
+  end
+
+  def subproject_address_params
+    params.require(:subproject_address).permit(:subproject_id, :streetname, :zipcode, :city, :country)
+  end
+end
\ No newline at end of file
diff --git a/app/models/subproject_address.rb b/app/models/subproject_address.rb
new file mode 100644
index 0000000..d96b910
--- /dev/null
+++ b/app/models/subproject_address.rb
@@ -0,0 +1,5 @@
+class SubprojectAddress < ApplicationRecord
+  belongs_to :subproject
+
+  validates :streetname, :zipcode, :city, :country, presence: true
+end
\ No newline at end of file
diff --git a/app/views/subproject_addresses/_form.html.erb b/app/views/subproject_addresses/_form.html.erb
new file mode 100644
index 0000000..3e86f33
--- /dev/null
+++ b/app/views/subproject_addresses/_form.html.erb
@@ -0,0 +1,24 @@
+<%= form_with(model: subproject_address) do |form| %>
+  <% if subproject_address.errors.any? %>
+    <div style="color: red">
+      <h2><%= pluralize(subproject_address.errors.count, "error") %> prohibited this client from being saved:</h2>
+
+      <ul>
+        <% subproject_address.errors.each do |error| %>
+          <li><%= error.full_message %></li>
+        <% end %>
+      </ul>
+    </div>
+  <% end %>
+
+  <% [:streetname, :zipcode, :city, :country].each do |attrib| %>
+  <div>
+    <%= form.label attrib, style: "display: block" %>
+    <%= form.text_field attrib %>
+  </div>
+  <% end %>
+
+  <div>
+    <%= form.submit %>
+  </div>
+<% end %>
diff --git a/app/views/subproject_addresses/_subproject_address.erb b/app/views/subproject_addresses/_subproject_address.erb
new file mode 100644
index 0000000..48074fc
--- /dev/null
+++ b/app/views/subproject_addresses/_subproject_address.erb
@@ -0,0 +1,22 @@
+<div id="<%= dom_id subproject_address %>">
+  <p>
+    <strong>Streetname:</strong>
+    <%= subproject_address.streetname %>
+  </p>
+
+  <p>
+    <strong>Zipcode:</strong>
+    <%= subproject_address.zipcode %>
+  </p>
+
+  <p>
+    <strong>City:</strong>
+    <%= subproject_address.city %>
+  </p>
+
+  <p>
+    <strong>Country:</strong>
+    <%= subproject_address.country %>
+  </p>
+
+</div>
diff --git a/app/views/subproject_addresses/edit.html.erb b/app/views/subproject_addresses/edit.html.erb
new file mode 100644
index 0000000..c65a869
--- /dev/null
+++ b/app/views/subproject_addresses/edit.html.erb
@@ -0,0 +1,12 @@
+<% content_for :title, "Editing subproject address" %>
+
+<h1>Editing subproject address</h1>
+
+<%= render "form", subproject_address: @subproject_address %>
+
+<br>
+
+<div>
+  <%= link_to "Show this subproject address", @subproject_address %> |
+  <%= link_to "Back to subproject addresses", subproject_addresses_path %>
+</div>
\ No newline at end of file
diff --git a/app/views/subproject_addresses/index.html.erb b/app/views/subproject_addresses/index.html.erb
new file mode 100644
index 0000000..b094e3c
--- /dev/null
+++ b/app/views/subproject_addresses/index.html.erb
@@ -0,0 +1,18 @@
+<p style="color: green"><%= notice %></p>
+
+<% content_for :title, "Subproject addresses" %>
+
+<h1>Subproject addresses</h1>
+
+<div id="subproject_addresses">
+  <% @subproject_addresses.each do |subproject_address| %>
+    <%= render subproject_address %>
+    <p>
+      <%= link_to "Show this subproject address", subproject_address %>
+    </p>
+  <% end %>
+</div>
+
+<%= link_to "New subproject address", new_subproject_address_path %>
+
+<%= link_to "Back to main", "/" %>
\ No newline at end of file
diff --git a/app/views/subproject_addresses/new.html.erb b/app/views/subproject_addresses/new.html.erb
new file mode 100644
index 0000000..9ee3a44
--- /dev/null
+++ b/app/views/subproject_addresses/new.html.erb
@@ -0,0 +1,11 @@
+<% content_for :title, "New subproject address" %>
+
+<h1>New subproject address</h1>
+
+<%= render "form", subproject_address: @subproject_address %>
+
+<br>
+
+<div>
+  <%= link_to "Back to subproject addresses", subproject_addresses_path %>
+</div>
diff --git a/app/views/subproject_addresses/show.html.erb b/app/views/subproject_addresses/show.html.erb
new file mode 100644
index 0000000..90871bf
--- /dev/null
+++ b/app/views/subproject_addresses/show.html.erb
@@ -0,0 +1,10 @@
+<p style="color: green"><%= notice %></p>
+
+<%= render @subproject_address %>
+
+<div>
+  <%= link_to "Edit this subproject address", edit_subproject_address_path(@subproject_address) %> |
+  <%= link_to "Back to subproject addresses", subproject_addresses_path %>
+
+  <%= button_to "Destroy this subproject address", @subproject_address, method: :delete %>
+</div>
\ No newline at end of file
diff --git a/config/routes.rb b/config/routes.rb
index 5db00c0..115640c 100644
--- a/config/routes.rb
+++ b/config/routes.rb
@@ -1,6 +1,7 @@
 Rails.application.routes.draw do
   resources :clients
   resources :subprojects
+  resources :subproject_addresses
   resources :projects
   # Define your application routes per the DSL in https://guides.rubyonrails.org/routing.html
 
diff --git a/db/migrate/20250722152542_create_subproject_addresses.rb b/db/migrate/20250722152542_create_subproject_addresses.rb
new file mode 100644
index 0000000..40ed309
--- /dev/null
+++ b/db/migrate/20250722152542_create_subproject_addresses.rb
@@ -0,0 +1,13 @@
+class CreateSubprojectAddresses < ActiveRecord::Migration[8.0]
+  def change
+    create_table :subproject_addresses do |t|
+      t.string :streetname
+      t.string :zipcode
+      t.string :city
+      t.string :country
+      t.text :notes
+
+      t.timestamps
+    end
+  end
+end
diff --git a/db/schema.rb b/db/schema.rb
index 479cb6d..b6dae50 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_21_145904) do
+ActiveRecord::Schema[8.0].define(version: 2025_07_22_152542) do
   create_table "clients", force: :cascade do |t|
     t.string "company_name"
     t.string "firstname"
@@ -36,6 +36,16 @@ ActiveRecord::Schema[8.0].define(version: 2025_07_21_145904) do
     t.datetime "order_date"
   end
 
+  create_table "subproject_addresses", force: :cascade do |t|
+    t.string "streetname"
+    t.string "zipcode"
+    t.string "city"
+    t.string "country"
+    t.text "notes"
+    t.datetime "created_at", null: false
+    t.datetime "updated_at", null: false
+  end
+
   create_table "subprojects", force: :cascade do |t|
     t.string "subproject_name"
     t.integer "project_id", null: false