diff --git a/app/models/validations/sales/soft_validations.rb b/app/models/validations/sales/soft_validations.rb
index ce7a812d2..2cf4742d8 100644
--- a/app/models/validations/sales/soft_validations.rb
+++ b/app/models/validations/sales/soft_validations.rb
@@ -96,8 +96,9 @@ module Validations::Sales::SoftValidations
 
   def purchase_price_out_of_soft_range?
     return unless value && beds && la && sale_range
+    return if is_staircase? && !stairbought&.positive?
 
-    !value.between?(sale_range.soft_min, sale_range.soft_max)
+    !full_purchase_price.between?(sale_range.soft_min, sale_range.soft_max)
   end
 
   def staircase_owned_out_of_soft_range?
@@ -136,11 +137,11 @@ module Validations::Sales::SoftValidations
   end
 
   def purchase_price_higher_or_lower_text
-    value < sale_range.soft_min ? "lower" : "higher"
+    full_purchase_price < sale_range.soft_min ? "lower" : "higher"
   end
 
   def purchase_price_soft_min_or_soft_max
-    value < sale_range.soft_min ? sale_range.soft_min : sale_range.soft_max
+    full_purchase_price < sale_range.soft_min ? sale_range.soft_min : sale_range.soft_max
   end
 
   def grant_outside_common_range?
@@ -203,6 +204,14 @@ module Validations::Sales::SoftValidations
 
 private
 
+  def full_purchase_price
+    if is_staircase? && stairbought&.positive?
+      value * 100 / stairbought
+    else
+      value
+    end
+  end
+
   def sale_range
     LaSaleRange.find_by(
       start_year: collection_start_year,
diff --git a/spec/models/validations/sales/soft_validations_spec.rb b/spec/models/validations/sales/soft_validations_spec.rb
index 0f8ff16c4..1466d2b8e 100644
--- a/spec/models/validations/sales/soft_validations_spec.rb
+++ b/spec/models/validations/sales/soft_validations_spec.rb
@@ -808,6 +808,63 @@ RSpec.describe Validations::Sales::SoftValidations do
 
       expect(record).not_to be_purchase_price_out_of_soft_range
     end
+
+    context "when staircasing" do
+      it "is not out of range when stairbought is 10% and value is 20,000 (full price 200,000 is in soft range)" do
+        record.staircase = 1
+        record.stairbought = 10
+        record.value = 20_000
+        record.beds = 2
+        record.la = "E07000223"
+        record.saledate = Time.zone.local(2023, 1, 1)
+
+        expect(record).not_to be_purchase_price_out_of_soft_range
+      end
+
+      it "is out of range when stairbought is 10% and value is 17,000 (full price 170,000 is below soft min of 177,000)" do
+        record.staircase = 1
+        record.stairbought = 10
+        record.value = 17_000
+        record.beds = 2
+        record.la = "E07000223"
+        record.saledate = Time.zone.local(2023, 1, 1)
+
+        expect(record).to be_purchase_price_out_of_soft_range
+      end
+
+      it "is out of range when stairbought is 10% and value is 40,000 (full price 400,000 is above soft max of 384,000)" do
+        record.staircase = 1
+        record.stairbought = 10
+        record.value = 40_000
+        record.beds = 2
+        record.la = "E07000223"
+        record.saledate = Time.zone.local(2023, 1, 1)
+
+        expect(record).to be_purchase_price_out_of_soft_range
+      end
+
+      it "does not trigger when stairbought is not set" do
+        record.staircase = 1
+        record.stairbought = nil
+        record.value = 20_000
+        record.beds = 2
+        record.la = "E07000223"
+        record.saledate = Time.zone.local(2023, 1, 1)
+
+        expect(record).not_to be_purchase_price_out_of_soft_range
+      end
+
+      it "does not trigger when stairbought is 0" do
+        record.staircase = 1
+        record.stairbought = 0
+        record.value = 20_000
+        record.beds = 2
+        record.la = "E07000223"
+        record.saledate = Time.zone.local(2023, 1, 1)
+
+        expect(record).not_to be_purchase_price_out_of_soft_range
+      end
+    end
   end
 
   describe "#grant_outside_common_range?" do