diff --git a/app/models/form/sales/pages/staircase_bought_value_check.rb b/app/models/form/sales/pages/staircase_bought_value_check.rb
new file mode 100644
index 000000000..98762dff2
--- /dev/null
+++ b/app/models/form/sales/pages/staircase_bought_value_check.rb
@@ -0,0 +1,27 @@
+class Form::Sales::Pages::StaircaseBoughtValueCheck < ::Form::Page
+  def initialize(id, hsh, subsection)
+    super
+    @id = "staircase_bought_value_check"
+    @depends_on = [
+      {
+        "staircase_bought_above_fifty?" => true,
+      },
+    ]
+    @title_text = {
+      "translation" => "soft_validations.staircase_bought_seems_high",
+      "arguments" => [
+        {
+          "key" => "stairbought",
+          "i18n_template" => "percentage",
+        }
+      ]
+    }
+    @informative_text = {}
+  end
+
+  def questions
+    @questions ||= [
+      Form::Sales::Questions::StaircaseBoughtValueCheck.new(nil, nil, self),
+    ]
+  end
+end
diff --git a/app/models/form/sales/questions/staircase_bought_value_check.rb b/app/models/form/sales/questions/staircase_bought_value_check.rb
new file mode 100644
index 000000000..65fe02e66
--- /dev/null
+++ b/app/models/form/sales/questions/staircase_bought_value_check.rb
@@ -0,0 +1,23 @@
+class Form::Sales::Questions::StaircaseBoughtValueCheck < ::Form::Question
+  def initialize(id, hsh, page)
+    super
+    @id = "staircase_bought_value_check"
+    @check_answer_label = "Percentage bought confirmation"
+    @header = "Are you sure this is correct?"
+    @type = "interruption_screen"
+    @answer_options = {
+      "0" => { "value" => "Yes" },
+      "1" => { "value" => "No" },
+    }
+    @hidden_in_check_answers = {
+      "depends_on" => [
+        {
+          "staircase_bought_value_check" => 0,
+        },
+        {
+          "staircase_bought_value_check" => 1,
+        },
+      ],
+    }
+  end
+end
diff --git a/app/models/form/sales/subsections/shared_ownership_scheme.rb b/app/models/form/sales/subsections/shared_ownership_scheme.rb
index e7ff1cf6e..0e2e3fdda 100644
--- a/app/models/form/sales/subsections/shared_ownership_scheme.rb
+++ b/app/models/form/sales/subsections/shared_ownership_scheme.rb
@@ -11,6 +11,7 @@ class Form::Sales::Subsections::SharedOwnershipScheme < ::Form::Subsection
       Form::Sales::Pages::LivingBeforePurchase.new("living_before_purchase_shared_ownership", nil, self),
       Form::Sales::Pages::Staircase.new(nil, nil, self),
       Form::Sales::Pages::AboutStaircase.new(nil, nil, self),
+      Form::Sales::Pages::StaircaseBoughtValueCheck.new(nil, nil, self),
       Form::Sales::Pages::Resale.new(nil, nil, self),
       Form::Sales::Pages::ExchangeDate.new(nil, nil, self),
       Form::Sales::Pages::HandoverDate.new(nil, nil, self),
diff --git a/app/models/validations/sales/soft_validations.rb b/app/models/validations/sales/soft_validations.rb
index 70af22fec..0bffe1234 100644
--- a/app/models/validations/sales/soft_validations.rb
+++ b/app/models/validations/sales/soft_validations.rb
@@ -13,6 +13,10 @@ module Validations::Sales::SoftValidations
     income1 < ALLOWED_INCOME_RANGES[ecstat1][:soft_min]
   end
 
+  def staircase_bought_above_fifty?
+    stairbought && stairbought > 50
+  end
+
   def mortgage_over_soft_max?
     return false unless mortgage && inc1mort && inc2mort
     return false if income1_used_for_mortgage? && income1.blank? || income2_used_for_mortgage? && income2.blank?
diff --git a/db/migrate/20230125152916_add_staircase_bought_value_check_to_sales_log.rb b/db/migrate/20230125152916_add_staircase_bought_value_check_to_sales_log.rb
new file mode 100644
index 000000000..d7e227afa
--- /dev/null
+++ b/db/migrate/20230125152916_add_staircase_bought_value_check_to_sales_log.rb
@@ -0,0 +1,5 @@
+class AddStaircaseBoughtValueCheckToSalesLog < ActiveRecord::Migration[7.0]
+  def change
+    add_column :sales_logs, :staircase_bought_value_check, :integer
+  end
+end
diff --git a/spec/models/form/sales/subsections/shared_ownership_scheme_spec.rb b/spec/models/form/sales/subsections/shared_ownership_scheme_spec.rb
index d131bc605..58a762ccb 100644
--- a/spec/models/form/sales/subsections/shared_ownership_scheme_spec.rb
+++ b/spec/models/form/sales/subsections/shared_ownership_scheme_spec.rb
@@ -17,6 +17,7 @@ RSpec.describe Form::Sales::Subsections::SharedOwnershipScheme, type: :model do
         living_before_purchase_shared_ownership
         staircasing
         about_staircasing
+        staircase_bought_value_check
         resale
         exchange_contracts
         handover_date
diff --git a/spec/models/validations/sales/soft_validations_spec.rb b/spec/models/validations/sales/soft_validations_spec.rb
index 234f810bc..dc873bc97 100644
--- a/spec/models/validations/sales/soft_validations_spec.rb
+++ b/spec/models/validations/sales/soft_validations_spec.rb
@@ -367,7 +367,7 @@ RSpec.describe Validations::Sales::SoftValidations do
           .to be_deposit_over_soft_max
       end
 
-      it "returns fals if deposit is less than 4/3 of savings" do
+      it "returns false if deposit is less than 4/3 of savings" do
         record.deposit = 7_999
         record.savings = 6_000
         expect(record)
@@ -573,4 +573,24 @@ RSpec.describe Validations::Sales::SoftValidations do
       expect(record).not_to be_grant_outside_common_range
     end
   end
+
+  describe "#staircase_bought_above_fifty" do
+    it "returns false when stairbought is not set" do
+      record.stairbought = nil
+
+      expect(record).not_to be_staircase_bought_above_fifty
+    end
+
+    it "returns false when stairbought is below fifty" do
+      record.stairbought = 40
+
+      expect(record).not_to be_staircase_bought_above_fifty
+    end
+
+    it "returns true when stairbought is above fifty" do
+      record.stairbought = 70
+
+      expect(record).to be_staircase_bought_above_fifty
+    end
+  end
 end