diff --git a/app/models/client.rb b/app/models/client.rb
index 87d2f30..8bb8b75 100644
--- a/app/models/client.rb
+++ b/app/models/client.rb
@@ -5,4 +5,12 @@ class Client < ApplicationRecord
 
   validates :company_name, :firstname, :lastname, presence: true
   # Add other validations as needed
+
+  def referenced_count
+    owner_subprojects.count + builder_subprojects.count + client_subprojects.count
+  end
+
+  def editable?
+    referenced_count <= 1
+  end
 end
\ No newline at end of file
diff --git a/app/views/clients/_form.html.erb b/app/views/clients/_form.html.erb
index e5f532f..ada555a 100644
--- a/app/views/clients/_form.html.erb
+++ b/app/views/clients/_form.html.erb
@@ -1,62 +1,28 @@
-<%= form_with(model: client) do |form| %>
-  <% if client.errors.any? %>
-    <div style="color: red">
-      <h2><%= pluralize(client.errors.count, "error") %> prohibited this client from being saved:</h2>
+<% if @client.editable? %>
+  <%= form_with(model: client) do |form| %>
+    <% if client.errors.any? %>
+      <div style="color: red">
+        <h2><%= pluralize(client.errors.count, "error") %> prohibited this client from being saved:</h2>
 
-      <ul>
-        <% client.errors.each do |error| %>
-          <li><%= error.full_message %></li>
-        <% end %>
-      </ul>
+        <ul>
+          <% client.errors.each do |error| %>
+            <li><%= error.full_message %></li>
+          <% end %>
+        </ul>
+      </div>
+    <% end %>
+
+    <% [:company_name, :firstname, :lastname, :streetname, :zipcode, :city, :country, :email, :phone].each do |attrib|%>
+      <div>
+        <%= form.label attrib, style: "display: block" %>
+        <%= form.text_field attrib %><br>
+      </div>
+    <% end %>
+
+    <div>
+      <%= form.submit %>
     </div>
   <% end %>
-
-  <div>
-    <%= form.label :company_name, style: "display: block" %>
-    <%= form.text_field :company_name %>
-  </div>
-
-  <div>
-    <%= form.label :firstname, style: "display: block" %>
-    <%= form.text_field :firstname %>
-  </div>
-
-  <div>
-    <%= form.label :lastname, style: "display: block" %>
-    <%= form.text_field :lastname %>
-  </div>
-
-  <div>
-    <%= form.label :streetname, style: "display: block" %>
-    <%= form.text_field :streetname %>
-  </div>
-
-  <div>
-    <%= form.label :zipcode, style: "display: block" %>
-    <%= form.text_field :zipcode %>
-  </div>
-
-  <div>
-    <%= form.label :city, style: "display: block" %>
-    <%= form.text_field :city %>
-  </div>
-
-  <div>
-    <%= form.label :country, style: "display: block" %>
-    <%= form.text_field :country %>
-  </div>
-
-  <div>
-    <%= form.label :email, style: "display: block" %>
-    <%= form.text_field :email %>
-  </div>
-
-  <div>
-    <%= form.label :phone, style: "display: block" %>
-    <%= form.text_field :phone %>
-  </div>
-
-  <div>
-    <%= form.submit %>
-  </div>
+<% else %>
+  <p>This client is used in multiple subprojects and cannot be edited.</p>
 <% end %>