diff --git a/app/controllers/planning_applications/validation/reporting_types_controller.rb b/app/controllers/planning_applications/validation/reporting_types_controller.rb
index bb51015672..1daf90e327 100644
--- a/app/controllers/planning_applications/validation/reporting_types_controller.rb
+++ b/app/controllers/planning_applications/validation/reporting_types_controller.rb
@@ -30,7 +30,24 @@ def update
       private
 
       def reporting_type_params
-        params[:planning_application] ? params.require(:planning_application).permit(:reporting_type) : params.permit(:reporting_type)
+        (params[:planning_application] ? params.require(:planning_application) : params)
+          .permit(:reporting_type).to_h.merge(regulation_3:, regulation_4:)
+      end
+
+      def regulation_3
+        regulation_params == "true" && regulation_3_params == "true"
+      end
+
+      def regulation_4
+        regulation_params == "true" && regulation_3_params == "false"
+      end
+
+      def regulation_params
+        params[:planning_application][:regulation]
+      end
+
+      def regulation_3_params
+        params[:planning_application][:regulation_3]
       end
     end
   end
diff --git a/app/helpers/reporting_type_helper.rb b/app/helpers/reporting_type_helper.rb
new file mode 100644
index 0000000000..72ad9020aa
--- /dev/null
+++ b/app/helpers/reporting_type_helper.rb
@@ -0,0 +1,7 @@
+# frozen_string_literal: true
+
+module ReportingTypeHelper
+  def reporting_radio_button_disabled?(status, params)
+    status.reporting_type_status == :complete && params.blank?
+  end
+end
diff --git a/app/views/api/v1/planning_applications/_show.json.jbuilder b/app/views/api/v1/planning_applications/_show.json.jbuilder
index 85ac6e2357..e7d860c224 100644
--- a/app/views/api/v1/planning_applications/_show.json.jbuilder
+++ b/app/views/api/v1/planning_applications/_show.json.jbuilder
@@ -30,7 +30,9 @@ json.extract! planning_application,
   :target_date,
   :withdrawn_at,
   :work_status,
-  :boundary_geojson
+  :boundary_geojson,
+  :regulation_3,
+  :regulation_4
 if planning_application.site_notices.any?
   json.site_notice_content planning_application.site_notices.order(:created_at).last.content
 end
diff --git a/app/views/planning_applications/validation/reporting_types/_form.html.erb b/app/views/planning_applications/validation/reporting_types/_form.html.erb
index 8bf67ab620..8bcbb97713 100644
--- a/app/views/planning_applications/validation/reporting_types/_form.html.erb
+++ b/app/views/planning_applications/validation/reporting_types/_form.html.erb
@@ -4,7 +4,7 @@
   <%= form.govuk_radio_buttons_fieldset(:reporting_type, legend: {size: "m"}) do %>
     <% if @planning_application.application_type.selected_reporting_types? %>
       <% @planning_application.application_type.selected_reporting_types.each do |reporting_type| %>
-        <%= form.govuk_radio_button(:reporting_type, reporting_type.code, label: {text: reporting_type.full_description}) do %>
+        <%= form.govuk_radio_button(:reporting_type, reporting_type.code, label: {text: reporting_type.full_description}, disabled: reporting_radio_button_disabled?(@planning_application, params[:edit])) do %>
           <% if reporting_type.guidance? %>
             <%= render FormattedContentComponent.new(text: reporting_type.guidance, classname: "govuk-hint") %>
             <% if reporting_type.guidance_link? %>
@@ -22,7 +22,24 @@
     <% end %>
   <% end %>
 
-  <%= form.govuk_submit(t("form_actions.save_and_mark_as_complete")) do %>
-    <%= back_link %>
+  <%= form.govuk_radio_buttons_fieldset(:regulation, legend: {size: "m", text: "Is the local planning authority the owner of this land?"}) do %>
+    <%= form.govuk_radio_button :regulation, true, label: {text: "Yes"}, link_errors: true, disabled: reporting_radio_button_disabled?(@planning_application, params[:edit]), checked: @planning_application.regulation_3 || @planning_application.regulation_4 do %>
+      <%= form.govuk_radio_buttons_fieldset(:regulation, legend: {size: "s", text: "Is the local planning authority carrying out the works proposed?"}) do %>
+        <%= form.govuk_radio_button :regulation_3, true, label: {text: "Yes"}, link_errors: true, disabled: reporting_radio_button_disabled?(@planning_application, params[:edit]), checked: @planning_application.regulation_3 %>
+        <%= form.govuk_radio_button :regulation_3, false, label: {text: "No"}, disabled: reporting_radio_button_disabled?(@planning_application, params[:edit]), checked: @planning_application.regulation_4 %>
+      <% end %>
+    <% end %>
+    <%= form.govuk_radio_button :regulation, false, label: {text: "No"}, disabled: reporting_radio_button_disabled?(@planning_application, params[:edit]), checked: !@planning_application.regulation_3 && !@planning_application.regulation_4 %>
+  <% end %>
+
+  <% if @planning_application.reporting_type_status != :complete || params[:edit].present? %>
+    <%= form.govuk_submit(t("form_actions.save_and_mark_as_complete")) do %>
+      <%= govuk_link_to "Back", planning_application_validation_tasks_path(@planning_application), class: "govuk-button govuk-button--secondary" %>
+    <% end %>
+  <% else %>
+    <div class="govuk-button-group">
+      <%= govuk_link_to "Back", planning_application_validation_tasks_path(@planning_application), class: "govuk-button govuk-button--secondary" %>
+      <%= govuk_link_to "Edit reporting details", edit_planning_application_validation_reporting_type_path(@planning_application, edit: true), class: "govuk-body" %>
+    </div>
   <% end %>
 <% end %>
diff --git a/app/views/planning_applications/validation/reporting_types/edit.html.erb b/app/views/planning_applications/validation/reporting_types/edit.html.erb
index b59b60d3ea..6e6a1f98c5 100644
--- a/app/views/planning_applications/validation/reporting_types/edit.html.erb
+++ b/app/views/planning_applications/validation/reporting_types/edit.html.erb
@@ -1,5 +1,5 @@
 <% content_for :page_title do %>
-  Development type - <%= t("page_title") %>
+  Reporting details - <%= t("page_title") %>
 <% end %>
 
 <%= render(
@@ -7,11 +7,11 @@
       locals: {planning_application: @planning_application}
     ) %>
 
-<% content_for :title, "Development type" %>
+<% content_for :title, "Reporting details" %>
 
 <%= render(
       partial: "shared/proposal_header",
-      locals: {heading: "Select development type for reporting"}
+      locals: {heading: "Add reporting details"}
     ) %>
 
 <%= render "form" %>
diff --git a/app/views/planning_applications/validation/tasks/_application_details.html.erb b/app/views/planning_applications/validation/tasks/_application_details.html.erb
index 19bed06a7d..1706fb1b8a 100644
--- a/app/views/planning_applications/validation/tasks/_application_details.html.erb
+++ b/app/views/planning_applications/validation/tasks/_application_details.html.erb
@@ -43,7 +43,7 @@
     <% end %>
     <li id="development-type-for-reporting-task" class="app-task-list__item">
       <span class="app-task-list__task-name">
-        <%= govuk_link_to "Select development type for reporting", edit_planning_application_validation_reporting_type_path(@planning_application) %>
+        <%= govuk_link_to "Add reporting details", edit_planning_application_validation_reporting_type_path(@planning_application) %>
       </span>
 
       <%= render(
diff --git a/db/migrate/20240430102131_add_regulation3_and_regulation4_to_planning_application.rb b/db/migrate/20240430102131_add_regulation3_and_regulation4_to_planning_application.rb
new file mode 100644
index 0000000000..e5a2f30677
--- /dev/null
+++ b/db/migrate/20240430102131_add_regulation3_and_regulation4_to_planning_application.rb
@@ -0,0 +1,12 @@
+# frozen_string_literal: true
+
+class AddRegulation3AndRegulation4ToPlanningApplication < ActiveRecord::Migration[7.1]
+  def change
+    safety_assured {
+      change_table :planning_applications, bulk: true do |t|
+        t.boolean :regulation_3, default: false, null: false
+        t.boolean :regulation_4, default: false, null: false
+      end
+    }
+  end
+end
diff --git a/db/schema.rb b/db/schema.rb
index bf0a909d44..f210534f43 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[7.1].define(version: 2024_04_26_131939) do
+ActiveRecord::Schema[7.1].define(version: 2024_04_30_102131) do
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
   enable_extension "postgis"
@@ -677,6 +677,8 @@
     t.geography "neighbour_boundary_geojson", limit: {:srid=>4326, :type=>"geometry_collection", :geographic=>true}
     t.string "documents_status", default: "not_started", null: false
     t.datetime "in_committee_at"
+    t.boolean "regulation_3", default: false, null: false
+    t.boolean "regulation_4", default: false, null: false
     t.index "lower((reference)::text)", name: "ix_planning_applications_on_lower_reference"
     t.index "to_tsvector('english'::regconfig, description)", name: "index_planning_applications_on_description", using: :gin
     t.index ["api_user_id"], name: "ix_planning_applications_on_api_user_id"
diff --git a/public/api/docs/v1/swagger_doc.yaml b/public/api/docs/v1/swagger_doc.yaml
index 1ec86bf9f9..86d0df14d8 100644
--- a/public/api/docs/v1/swagger_doc.yaml
+++ b/public/api/docs/v1/swagger_doc.yaml
@@ -74,6 +74,8 @@ paths:
                     result_description: 'Based on the information you have provided, we do not think this is eligible for a Lawful Development Certificate'
                     result_override: This was my reason for rejecting the result
                     make_public: true
+                    regulation_3: false
+                    regulation_4: false
                     boundary_geojson:
                       type: Feature
                       geometry:
diff --git a/spec/system/planning_applications/validating/reporting_spec.rb b/spec/system/planning_applications/validating/reporting_spec.rb
new file mode 100644
index 0000000000..430b9d1344
--- /dev/null
+++ b/spec/system/planning_applications/validating/reporting_spec.rb
@@ -0,0 +1,165 @@
+# frozen_string_literal: true
+
+require "rails_helper"
+
+RSpec.describe "Reporting validation task" do
+  let!(:default_local_authority) { create(:local_authority, :default) }
+  let!(:assessor) { create(:user, :assessor, local_authority: default_local_authority) }
+  let!(:reporting_type) { create(:reporting_type, :ldc) }
+
+  let!(:planning_application) do
+    create(:planning_application, :not_started, local_authority: default_local_authority)
+  end
+
+  before do
+    sign_in assessor
+    visit "/planning_applications/#{planning_application.id}/validation/tasks"
+  end
+
+  context "when application is not started" do
+    it "I can see that reporting type is not started" do
+      expect(page).to have_link(
+        "Add reporting details",
+        href: "/planning_applications/#{planning_application.id}/validation/reporting_type/edit"
+      )
+      click_link "Add reporting details"
+
+      expect(page).to have_content("Add reporting details")
+
+      expect(page).to have_content("Select development type")
+
+      click_link "Back"
+
+      within("#development-type-for-reporting-task") do
+        expect(page).to have_selector(".govuk-tag", text: "Not started")
+      end
+    end
+
+    it "I can select the development type for reporting" do
+      click_link "Add reporting details"
+
+      expect(page).to have_content("Add reporting details")
+
+      choose "Q26 – Certificates of lawful development"
+
+      expect(page).to have_content("Includes both existing & proposed applications")
+
+      click_button "Save and mark as complete"
+
+      within(".govuk-notification-banner--notice") do
+        expect(page).to have_content("Planning application's development type for reporting was successfully selected")
+      end
+
+      within("#development-type-for-reporting-task") do
+        expect(page).to have_selector(".govuk-tag", text: "Completed")
+      end
+
+      expect(page).to have_link(
+        "Add reporting details",
+        href: "/planning_applications/#{planning_application.id}/validation/reporting_type/edit"
+      )
+    end
+
+    it "shows errors when a development type for reporting is not selected" do
+      click_link "Add reporting details"
+
+      click_button "Save and mark as complete"
+
+      expect(page).to have_content "Please select a development type for reporting"
+    end
+
+    it "I can report whether regulation 3 applies" do
+      click_link "Add reporting details"
+
+      expect(page).to have_content("Add reporting details")
+
+      choose "Q26 – Certificates of lawful development"
+
+      expect(page).to have_content("Includes both existing & proposed applications")
+
+      # Radios within radios makes finding 'yes' complicated
+      page.find(:xpath, '//*[@id="planning-application-regulation-true-field"]').click
+      page.find(:xpath, '//*[@id="planning-application-regulation-3-true-field"]').click
+
+      click_button "Save and mark as complete"
+
+      within(".govuk-notification-banner--notice") do
+        expect(page).to have_content("Planning application's development type for reporting was successfully selected")
+      end
+
+      within("#development-type-for-reporting-task") do
+        expect(page).to have_selector(".govuk-tag", text: "Completed")
+      end
+
+      expect(planning_application.reload.regulation_3).to be true
+      expect(planning_application.reload.regulation_4).to be false
+    end
+
+    it "I can report whether regulation 4 applies" do
+      click_link "Add reporting details"
+
+      expect(page).to have_content("Add reporting details")
+
+      choose "Q26 – Certificates of lawful development"
+
+      expect(page).to have_content("Includes both existing & proposed applications")
+
+      # Radios within radios makes finding 'yes' complicated
+      page.find(:xpath, '//*[@id="planning-application-regulation-true-field"]').click
+      page.find(:xpath, '//*[@id="planning-application-regulation-3-field"]').click
+
+      click_button "Save and mark as complete"
+
+      within(".govuk-notification-banner--notice") do
+        expect(page).to have_content("Planning application's development type for reporting was successfully selected")
+      end
+
+      within("#development-type-for-reporting-task") do
+        expect(page).to have_selector(".govuk-tag", text: "Completed")
+      end
+
+      expect(planning_application.reload.regulation_3).to be false
+      expect(planning_application.reload.regulation_4).to be true
+    end
+
+    it "I can edit the regulations" do
+      click_link "Add reporting details"
+
+      expect(page).to have_content("Add reporting details")
+
+      choose "Q26 – Certificates of lawful development"
+
+      expect(page).to have_content("Includes both existing & proposed applications")
+
+      # Radios within radios makes finding 'yes' complicated
+      page.find(:xpath, '//*[@id="planning-application-regulation-true-field"]').click
+      page.find(:xpath, '//*[@id="planning-application-regulation-3-field"]').click
+
+      click_button "Save and mark as complete"
+
+      within(".govuk-notification-banner--notice") do
+        expect(page).to have_content("Planning application's development type for reporting was successfully selected")
+      end
+
+      within("#development-type-for-reporting-task") do
+        expect(page).to have_selector(".govuk-tag", text: "Completed")
+        click_link "Add reporting details"
+      end
+
+      expect(page).not_to have_content "Save and mark as complete"
+
+      click_link "Edit reporting details"
+
+      page.find(:xpath, '//*[@id="planning-application-regulation-field"]').click
+
+      click_button "Save and mark as complete"
+
+      within("#development-type-for-reporting-task") do
+        expect(page).to have_selector(".govuk-tag", text: "Completed")
+      end
+
+      expect(planning_application.reload.regulation_3).to be false
+      expect(planning_application.reload.regulation_4).to be false
+    end
+  end
+end
diff --git a/spec/system/planning_applications/validating/reporting_type_spec.rb b/spec/system/planning_applications/validating/reporting_type_spec.rb
deleted file mode 100644
index 16ec2151d7..0000000000
--- a/spec/system/planning_applications/validating/reporting_type_spec.rb
+++ /dev/null
@@ -1,71 +0,0 @@
-# frozen_string_literal: true
-
-require "rails_helper"
-
-RSpec.describe "Reporting type validation task" do
-  let!(:default_local_authority) { create(:local_authority, :default) }
-  let!(:assessor) { create(:user, :assessor, local_authority: default_local_authority) }
-  let!(:reporting_type) { create(:reporting_type, :ldc) }
-
-  let!(:planning_application) do
-    create(:planning_application, :invalidated, local_authority: default_local_authority)
-  end
-
-  before do
-    sign_in assessor
-    visit "/planning_applications/#{planning_application.id}/validation/tasks"
-  end
-
-  context "when application is not started" do
-    it "I can see that reporting type is not started" do
-      expect(page).to have_link(
-        "Select development type for reporting",
-        href: "/planning_applications/#{planning_application.id}/validation/reporting_type/edit"
-      )
-      click_link "Select development type for reporting"
-
-      expect(page).to have_content("Select development type for reporting")
-
-      expect(page).to have_content("Select development type")
-
-      click_link "Back"
-
-      within("#development-type-for-reporting-task") do
-        expect(page).to have_selector(".govuk-tag", text: "Not started")
-      end
-    end
-
-    it "I can select the development type for reporting" do
-      click_link "Select development type for reporting"
-
-      expect(page).to have_content("Select development type for reporting")
-
-      choose "Q26 – Certificates of lawful development"
-
-      expect(page).to have_content("Includes both existing & proposed applications")
-
-      click_button "Save and mark as complete"
-
-      within(".govuk-notification-banner--notice") do
-        expect(page).to have_content("Planning application's development type for reporting was successfully selected")
-      end
-
-      within("#development-type-for-reporting-task") do
-        expect(page).to have_selector(".govuk-tag", text: "Completed")
-      end
-
-      expect(page).to have_link(
-        "Select development type for reporting",
-        href: "/planning_applications/#{planning_application.id}/validation/reporting_type/edit"
-      )
-    end
-
-    it "shows errors when a development type for reporting is not selected" do
-      click_link "Select development type for reporting"
-
-      click_button "Save and mark as complete"
-
-      expect(page).to have_content "Please select a development type for reporting"
-    end
-  end
-end
diff --git a/spec/system/planning_applications/validating/validation_tasks_index_spec.rb b/spec/system/planning_applications/validating/validation_tasks_index_spec.rb
index d8a2029400..9b4c0f283a 100644
--- a/spec/system/planning_applications/validating/validation_tasks_index_spec.rb
+++ b/spec/system/planning_applications/validating/validation_tasks_index_spec.rb
@@ -88,7 +88,7 @@
 
           within("#development-type-for-reporting-task") do
             expect(page).to have_link(
-              "Select development type for reporting",
+              "Add reporting details",
               href: edit_planning_application_validation_reporting_type_path(planning_application)
             )
             within(".govuk-tag--grey") do
@@ -254,7 +254,7 @@
 
           within("#development-type-for-reporting-task") do
             expect(page).to have_link(
-              "Select development type for reporting",
+              "Add reporting details",
               href: edit_planning_application_validation_reporting_type_path(planning_application)
             )
             within(".govuk-tag--grey") do