diff --git a/app/models/form/sales/pages/buyer_interview.rb b/app/models/form/sales/pages/buyer_interview.rb
index ebd2e387a..2d20a9490 100644
--- a/app/models/form/sales/pages/buyer_interview.rb
+++ b/app/models/form/sales/pages/buyer_interview.rb
@@ -1,12 +1,20 @@
 class Form::Sales::Pages::BuyerInterview < ::Form::Page
-  def initialize(id, hsh, subsection)
-    super
-    @id = "buyer_interview"
+  def initialize(id, hsh, subsection, joint_purchase:)
+    super(id, hsh, subsection)
+    @joint_purchase = joint_purchase
   end
 
   def questions
     @questions ||= [
-      Form::Sales::Questions::BuyerInterview.new(nil, nil, self),
+      Form::Sales::Questions::BuyerInterview.new(nil, nil, self, joint_purchase: @joint_purchase),
     ]
   end
+
+  def depends_on
+    if @joint_purchase
+      [{ "joint_purchase?" => true }]
+    else
+      [{ "not_joint_purchase?" => true }]
+    end
+  end
 end
diff --git a/app/models/form/sales/pages/old_persons_shared_ownership_value_check.rb b/app/models/form/sales/pages/old_persons_shared_ownership_value_check.rb
index 537a6679f..101f30f88 100644
--- a/app/models/form/sales/pages/old_persons_shared_ownership_value_check.rb
+++ b/app/models/form/sales/pages/old_persons_shared_ownership_value_check.rb
@@ -1,19 +1,15 @@
 class Form::Sales::Pages::OldPersonsSharedOwnershipValueCheck < ::Form::Page
-  def initialize(id, hsh, subsection)
-    super
-    @depends_on = [
-      {
-        "buyers_age_for_old_persons_shared_ownership_invalid?" => true,
-      },
-    ]
+  def initialize(id, hsh, subsection, joint_purchase:)
+    super(id, hsh, subsection)
     @title_text = {
-      "translation" => "soft_validations.old_persons_shared_ownership.title_text",
+      "translation" => "soft_validations.old_persons_shared_ownership.title_text.#{joint_purchase ? 'two' : 'one'}",
       "arguments" => [],
     }
     @informative_text = {
       "translation" => "soft_validations.old_persons_shared_ownership.hint_text",
       "arguments" => [],
     }
+    @joint_purchase = joint_purchase
   end
 
   def questions
@@ -25,4 +21,12 @@ class Form::Sales::Pages::OldPersonsSharedOwnershipValueCheck < ::Form::Page
   def interruption_screen_question_ids
     %w[type jointpur age1 age2]
   end
+
+  def depends_on
+    if @joint_purchase
+      [{ "joint_purchase?" => true, "buyers_age_for_old_persons_shared_ownership_invalid?" => true }]
+    else
+      [{ "not_joint_purchase?" => true, "buyers_age_for_old_persons_shared_ownership_invalid?" => true }]
+    end
+  end
 end
diff --git a/app/models/form/sales/pages/privacy_notice.rb b/app/models/form/sales/pages/privacy_notice.rb
index dc4bfa70d..818baaa02 100644
--- a/app/models/form/sales/pages/privacy_notice.rb
+++ b/app/models/form/sales/pages/privacy_notice.rb
@@ -1,13 +1,21 @@
 class Form::Sales::Pages::PrivacyNotice < ::Form::Page
-  def initialize(id, hsh, subsection)
-    super
-    @id = "privacy_notice"
+  def initialize(id, hsh, subsection, joint_purchase:)
+    super(id, hsh, subsection)
     @header = "Department for Levelling Up, Housing and Communities privacy notice"
+    @joint_purchase = joint_purchase
   end
 
   def questions
     @questions ||= [
-      Form::Sales::Questions::PrivacyNotice.new(nil, nil, self),
+      Form::Sales::Questions::PrivacyNotice.new(nil, nil, self, joint_purchase: @joint_purchase),
     ]
   end
+
+  def depends_on
+    if @joint_purchase
+      [{ "joint_purchase?" => true }]
+    else
+      [{ "not_joint_purchase?" => true }]
+    end
+  end
 end
diff --git a/app/models/form/sales/questions/buyer_interview.rb b/app/models/form/sales/questions/buyer_interview.rb
index aa737171f..f957b392a 100644
--- a/app/models/form/sales/questions/buyer_interview.rb
+++ b/app/models/form/sales/questions/buyer_interview.rb
@@ -1,11 +1,11 @@
 class Form::Sales::Questions::BuyerInterview < ::Form::Question
-  def initialize(id, hsh, page)
-    super
+  def initialize(id, hsh, page, joint_purchase:)
+    super(id, hsh, page)
     @id = "noint"
-    @check_answer_label = "Buyer interviewed in person?"
-    @header = "Was the buyer interviewed for any of the answers you will provide on this log?"
+    @check_answer_label = "#{joint_purchase ? 'Buyers' : 'Buyer'} interviewed in person?"
+    @header = "#{joint_purchase ? 'Were the buyers' : 'Was the buyer'} interviewed for any of the answers you will provide on this log?"
     @type = "radio"
-    @hint_text = "You should still try to answer all questions even if the buyer wasn't interviewed in person"
+    @hint_text = "You should still try to answer all questions even if the #{joint_purchase ? "buyers weren't" : "buyer wasn't"} interviewed in person"
     @answer_options = ANSWER_OPTIONS
     @question_number = 18
   end
diff --git a/app/models/form/sales/questions/privacy_notice.rb b/app/models/form/sales/questions/privacy_notice.rb
index 62eab5d8f..84bfbb8f2 100644
--- a/app/models/form/sales/questions/privacy_notice.rb
+++ b/app/models/form/sales/questions/privacy_notice.rb
@@ -1,19 +1,20 @@
 class Form::Sales::Questions::PrivacyNotice < ::Form::Question
-  def initialize(id, hsh, page)
-    super
+  def initialize(id, hsh, page, joint_purchase:)
+    super(id, hsh, page)
     @id = "privacynotice"
-    @check_answer_label = "Buyer has seen the privacy notice?"
+    @check_answer_label = "#{joint_purchase ? 'Buyers have' : 'Buyer has'} seen the privacy notice?"
     @header = "Declaration"
     @type = "checkbox"
     @top_guidance_partial = form.start_year_after_2024? ? "privacy_notice_buyer_2024" : "privacy_notice_buyer"
     @question_number = 19
+    @joint_purchase = joint_purchase
   end
 
   def answer_options
     declaration_text = if form.start_year_after_2024?
-                         "The buyer has seen or been given access to the DLUHC privacy notice"
+                         "The #{@joint_purchase ? 'buyers have' : 'buyer has'} seen or been given access to the DLUHC privacy notice"
                        else
-                         "The buyer has seen the DLUHC privacy notice"
+                         "The #{@joint_purchase ? 'buyers have' : 'buyer has'} seen the DLUHC privacy notice"
                        end
 
     { "privacynotice" => { "value" => declaration_text } }.freeze
diff --git a/app/models/form/sales/subsections/household_characteristics.rb b/app/models/form/sales/subsections/household_characteristics.rb
index ac006b453..eeb8dbea3 100644
--- a/app/models/form/sales/subsections/household_characteristics.rb
+++ b/app/models/form/sales/subsections/household_characteristics.rb
@@ -8,11 +8,14 @@ class Form::Sales::Subsections::HouseholdCharacteristics < ::Form::Subsection
 
   def pages
     @pages ||= [
-      (Form::Sales::Pages::BuyerInterview.new(nil, nil, self) unless form.start_year_after_2024?),
-      (Form::Sales::Pages::PrivacyNotice.new(nil, nil, self) unless form.start_year_after_2024?),
+      (Form::Sales::Pages::BuyerInterview.new("buyer_interview_joint_purchase", nil, self, joint_purchase: true) unless form.start_year_after_2024?),
+      (Form::Sales::Pages::BuyerInterview.new("buyer_interview", nil, self, joint_purchase: false) unless form.start_year_after_2024?),
+      (Form::Sales::Pages::PrivacyNotice.new("privacy_notice_joint_purchase", nil, self, joint_purchase: true) unless form.start_year_after_2024?),
+      (Form::Sales::Pages::PrivacyNotice.new("privacy_notice", nil, self, joint_purchase: false) unless form.start_year_after_2024?),
       Form::Sales::Pages::Age1.new(nil, nil, self),
       Form::Sales::Pages::RetirementValueCheck.new("age_1_retirement_value_check", nil, self, person_index: 1),
-      Form::Sales::Pages::OldPersonsSharedOwnershipValueCheck.new("age_1_old_persons_shared_ownership_value_check", nil, self),
+      Form::Sales::Pages::OldPersonsSharedOwnershipValueCheck.new("age_1_old_persons_shared_ownership_joint_purchase_value_check", nil, self, joint_purchase: true),
+      Form::Sales::Pages::OldPersonsSharedOwnershipValueCheck.new("age_1_old_persons_shared_ownership_value_check", nil, self, joint_purchase: false),
       Form::Sales::Pages::GenderIdentity1.new(nil, nil, self),
       Form::Sales::Pages::RetirementValueCheck.new("gender_1_retirement_value_check", nil, self, person_index: 1),
       Form::Sales::Pages::Buyer1EthnicGroup.new(nil, nil, self),
@@ -30,7 +33,8 @@ class Form::Sales::Subsections::HouseholdCharacteristics < ::Form::Subsection
       Form::Sales::Pages::Buyer2RelationshipToBuyer1.new(nil, nil, self),
       Form::Sales::Pages::PersonStudentNotChildValueCheck.new("buyer_2_relationship_student_not_child_value_check", nil, self, person_index: 2),
       Form::Sales::Pages::Age2.new(nil, nil, self),
-      Form::Sales::Pages::OldPersonsSharedOwnershipValueCheck.new("age_2_old_persons_shared_ownership_value_check", nil, self),
+      Form::Sales::Pages::OldPersonsSharedOwnershipValueCheck.new("age_2_old_persons_shared_ownership_joint_purchase_value_check", nil, self, joint_purchase: true),
+      Form::Sales::Pages::OldPersonsSharedOwnershipValueCheck.new("age_2_old_persons_shared_ownership_value_check", nil, self, joint_purchase: false),
       Form::Sales::Pages::RetirementValueCheck.new("age_2_buyer_retirement_value_check", nil, self, person_index: 2),
       Form::Sales::Pages::PersonStudentNotChildValueCheck.new("buyer_2_age_student_not_child_value_check", nil, self, person_index: 2),
       Form::Sales::Pages::GenderIdentity2.new(nil, nil, self),
diff --git a/app/models/form/sales/subsections/setup.rb b/app/models/form/sales/subsections/setup.rb
index 49e9392bb..f954e24e6 100644
--- a/app/models/form/sales/subsections/setup.rb
+++ b/app/models/form/sales/subsections/setup.rb
@@ -20,8 +20,10 @@ class Form::Sales::Subsections::Setup < ::Form::Subsection
       Form::Sales::Pages::BuyerLive.new(nil, nil, self),
       Form::Sales::Pages::JointPurchase.new(nil, nil, self),
       Form::Sales::Pages::NumberJointBuyers.new(nil, nil, self),
-      (Form::Sales::Pages::BuyerInterview.new(nil, nil, self) if form.start_year_after_2024?),
-      (Form::Sales::Pages::PrivacyNotice.new(nil, nil, self) if form.start_year_after_2024?),
+      (Form::Sales::Pages::BuyerInterview.new("buyer_interview_joint_purchase", nil, self, joint_purchase: true) if form.start_year_after_2024?),
+      (Form::Sales::Pages::BuyerInterview.new("buyer_interview", nil, self, joint_purchase: false) if form.start_year_after_2024?),
+      (Form::Sales::Pages::PrivacyNotice.new("privacy_notice_joint_purchase", nil, self, joint_purchase: true) if form.start_year_after_2024?),
+      (Form::Sales::Pages::PrivacyNotice.new("privacy_notice", nil, self, joint_purchase: false) if form.start_year_after_2024?),
     ].flatten.compact
   end
 end
diff --git a/spec/models/form/sales/pages/buyer_interview_spec.rb b/spec/models/form/sales/pages/buyer_interview_spec.rb
index ffc4c9a3a..5d02332e0 100644
--- a/spec/models/form/sales/pages/buyer_interview_spec.rb
+++ b/spec/models/form/sales/pages/buyer_interview_spec.rb
@@ -1,9 +1,9 @@
 require "rails_helper"
 
 RSpec.describe Form::Sales::Pages::BuyerInterview, type: :model do
-  subject(:page) { described_class.new(page_id, page_definition, subsection) }
+  subject(:page) { described_class.new(page_id, page_definition, subsection, joint_purchase: false) }
 
-  let(:page_id) { nil }
+  let(:page_id) { "buyer_interview" }
   let(:page_definition) { nil }
   let(:subsection) { instance_double(Form::Subsection) }
 
diff --git a/spec/models/form/sales/pages/old_persons_shared_ownership_value_check_spec.rb b/spec/models/form/sales/pages/old_persons_shared_ownership_value_check_spec.rb
index d9c4beed9..0f4649ea8 100644
--- a/spec/models/form/sales/pages/old_persons_shared_ownership_value_check_spec.rb
+++ b/spec/models/form/sales/pages/old_persons_shared_ownership_value_check_spec.rb
@@ -1,7 +1,7 @@
 require "rails_helper"
 
 RSpec.describe Form::Sales::Pages::OldPersonsSharedOwnershipValueCheck, type: :model do
-  subject(:page) { described_class.new(page_id, page_definition, subsection) }
+  subject(:page) { described_class.new(page_id, page_definition, subsection, joint_purchase: false) }
 
   let(:page_id) { "old_persons_shared_ownership_value_check" }
   let(:page_definition) { nil }
@@ -27,13 +27,14 @@ RSpec.describe Form::Sales::Pages::OldPersonsSharedOwnershipValueCheck, type: :m
     expect(page.depends_on).to eq([
       {
         "buyers_age_for_old_persons_shared_ownership_invalid?" => true,
+        "not_joint_purchase?" => true,
       },
     ])
   end
 
   it "has the correct title_text" do
     expect(page.title_text).to eq({
-      "translation" => "soft_validations.old_persons_shared_ownership.title_text",
+      "translation" => "soft_validations.old_persons_shared_ownership.title_text.one",
       "arguments" => [],
     })
   end
@@ -45,4 +46,24 @@ RSpec.describe Form::Sales::Pages::OldPersonsSharedOwnershipValueCheck, type: :m
   it "has the correct interruption_screen_question_ids" do
     expect(page.interruption_screen_question_ids).to eq(%w[type jointpur age1 age2])
   end
+
+  context "with joint purchase" do
+    subject(:page) { described_class.new(page_id, page_definition, subsection, joint_purchase: true) }
+
+    it "has the correct title_text" do
+      expect(page.title_text).to eq({
+        "translation" => "soft_validations.old_persons_shared_ownership.title_text.two",
+        "arguments" => [],
+      })
+    end
+
+    it "has correct depends_on" do
+      expect(page.depends_on).to eq([
+        {
+          "buyers_age_for_old_persons_shared_ownership_invalid?" => true,
+          "joint_purchase?" => true,
+        },
+      ])
+    end
+  end
 end
diff --git a/spec/models/form/sales/pages/privacy_notice_spec.rb b/spec/models/form/sales/pages/privacy_notice_spec.rb
index 9c2ce1a64..0a3d389cf 100644
--- a/spec/models/form/sales/pages/privacy_notice_spec.rb
+++ b/spec/models/form/sales/pages/privacy_notice_spec.rb
@@ -1,9 +1,9 @@
 require "rails_helper"
 
 RSpec.describe Form::Sales::Pages::PrivacyNotice, type: :model do
-  subject(:page) { described_class.new(page_id, page_definition, subsection) }
+  subject(:page) { described_class.new(page_id, page_definition, subsection, joint_purchase: false) }
 
-  let(:page_id) { nil }
+  let(:page_id) { "privacy_notice" }
   let(:page_definition) { nil }
   let(:subsection) { instance_double(Form::Subsection) }
   let(:form) { instance_double(Form) }
@@ -34,6 +34,20 @@ RSpec.describe Form::Sales::Pages::PrivacyNotice, type: :model do
   end
 
   it "has correct depends_on" do
-    expect(page.depends_on).to be_nil
+    expect(page.depends_on).to eq([{ "not_joint_purchase?" => true }])
+  end
+
+  context "with joint purchase" do
+    subject(:page) { described_class.new(page_id, page_definition, subsection, joint_purchase: true) }
+
+    let(:page_id) { "privacy_notice_joint_purchase" }
+
+    it "has correct depends_on" do
+      expect(page.depends_on).to eq([{ "joint_purchase?" => true }])
+    end
+
+    it "has the correct id" do
+      expect(page.id).to eq("privacy_notice_joint_purchase")
+    end
   end
 end
diff --git a/spec/models/form/sales/questions/buyer_interview_spec.rb b/spec/models/form/sales/questions/buyer_interview_spec.rb
index 433d46f8b..0dc25978f 100644
--- a/spec/models/form/sales/questions/buyer_interview_spec.rb
+++ b/spec/models/form/sales/questions/buyer_interview_spec.rb
@@ -1,7 +1,7 @@
 require "rails_helper"
 
 RSpec.describe Form::Sales::Questions::BuyerInterview, type: :model do
-  subject(:question) { described_class.new(question_id, question_definition, page) }
+  subject(:question) { described_class.new(question_id, question_definition, page, joint_purchase: false) }
 
   let(:question_id) { nil }
   let(:question_definition) { nil }
@@ -41,4 +41,20 @@ RSpec.describe Form::Sales::Questions::BuyerInterview, type: :model do
       "1" => { "value" => "No" },
     })
   end
+
+  context "with joint purchase" do
+    subject(:question) { described_class.new(question_id, question_definition, page, joint_purchase: true) }
+
+    it "has the correct header" do
+      expect(question.header).to eq("Were the buyers interviewed for any of the answers you will provide on this log?")
+    end
+
+    it "has the correct hint_text" do
+      expect(question.hint_text).to eq("You should still try to answer all questions even if the buyers weren't interviewed in person")
+    end
+
+    it "has the correct check_answer_label" do
+      expect(question.check_answer_label).to eq("Buyers interviewed in person?")
+    end
+  end
 end
diff --git a/spec/models/form/sales/subsections/household_characteristics_spec.rb b/spec/models/form/sales/subsections/household_characteristics_spec.rb
index 842dec8bc..3deddf001 100644
--- a/spec/models/form/sales/subsections/household_characteristics_spec.rb
+++ b/spec/models/form/sales/subsections/household_characteristics_spec.rb
@@ -25,10 +25,13 @@ RSpec.describe Form::Sales::Subsections::HouseholdCharacteristics, type: :model
     it "has correct pages" do
       expect(household_characteristics.pages.map(&:id)).to eq(
         %w[
+          buyer_interview_joint_purchase
           buyer_interview
+          privacy_notice_joint_purchase
           privacy_notice
           buyer_1_age
           age_1_retirement_value_check
+          age_1_old_persons_shared_ownership_joint_purchase_value_check
           age_1_old_persons_shared_ownership_value_check
           buyer_1_gender_identity
           gender_1_retirement_value_check
@@ -47,6 +50,7 @@ RSpec.describe Form::Sales::Subsections::HouseholdCharacteristics, type: :model
           buyer_2_relationship_to_buyer_1
           buyer_2_relationship_student_not_child_value_check
           buyer_2_age
+          age_2_old_persons_shared_ownership_joint_purchase_value_check
           age_2_old_persons_shared_ownership_value_check
           age_2_buyer_retirement_value_check
           buyer_2_age_student_not_child_value_check
@@ -129,10 +133,13 @@ RSpec.describe Form::Sales::Subsections::HouseholdCharacteristics, type: :model
     it "has correct pages" do
       expect(household_characteristics.pages.map(&:id)).to eq(
         %w[
+          buyer_interview_joint_purchase
           buyer_interview
+          privacy_notice_joint_purchase
           privacy_notice
           buyer_1_age
           age_1_retirement_value_check
+          age_1_old_persons_shared_ownership_joint_purchase_value_check
           age_1_old_persons_shared_ownership_value_check
           buyer_1_gender_identity
           gender_1_retirement_value_check
@@ -151,6 +158,7 @@ RSpec.describe Form::Sales::Subsections::HouseholdCharacteristics, type: :model
           buyer_2_relationship_to_buyer_1
           buyer_2_relationship_student_not_child_value_check
           buyer_2_age
+          age_2_old_persons_shared_ownership_joint_purchase_value_check
           age_2_old_persons_shared_ownership_value_check
           age_2_buyer_retirement_value_check
           buyer_2_age_student_not_child_value_check
@@ -242,6 +250,7 @@ RSpec.describe Form::Sales::Subsections::HouseholdCharacteristics, type: :model
         %w[
           buyer_1_age
           age_1_retirement_value_check
+          age_1_old_persons_shared_ownership_joint_purchase_value_check
           age_1_old_persons_shared_ownership_value_check
           buyer_1_gender_identity
           gender_1_retirement_value_check
@@ -260,6 +269,7 @@ RSpec.describe Form::Sales::Subsections::HouseholdCharacteristics, type: :model
           buyer_2_relationship_to_buyer_1
           buyer_2_relationship_student_not_child_value_check
           buyer_2_age
+          age_2_old_persons_shared_ownership_joint_purchase_value_check
           age_2_old_persons_shared_ownership_value_check
           age_2_buyer_retirement_value_check
           buyer_2_age_student_not_child_value_check
diff --git a/spec/models/form/sales/subsections/setup_spec.rb b/spec/models/form/sales/subsections/setup_spec.rb
index eb92e3753..d1964930e 100644
--- a/spec/models/form/sales/subsections/setup_spec.rb
+++ b/spec/models/form/sales/subsections/setup_spec.rb
@@ -67,7 +67,9 @@ RSpec.describe Form::Sales::Subsections::Setup, type: :model do
           buyer_live
           joint_purchase
           number_joint_buyers
+          buyer_interview_joint_purchase
           buyer_interview
+          privacy_notice_joint_purchase
           privacy_notice
         ],
       )