diff --git a/app/models/validations/sales/property_validations.rb b/app/models/validations/sales/property_validations.rb
index 197f664b4..59d616c9a 100644
--- a/app/models/validations/sales/property_validations.rb
+++ b/app/models/validations/sales/property_validations.rb
@@ -4,10 +4,11 @@ module Validations::Sales::PropertyValidations
     return unless record.ppostcode_full.present? && record.postcode_full.present?
 
     if record.discounted_ownership_sale? && record.ppostcode_full != record.postcode_full
-      record.errors.add :postcode_full, I18n.t("validations.sales.property_information.postcode_full.postcode_must_match_previous", buyer_possessive: record.joint_purchase? ? "Buyers’" : "Buyer’s")
-      record.errors.add :ppostcode_full, I18n.t("validations.sales.property_information.ppostcode_full.postcode_must_match_previous", buyer_possessive: record.joint_purchase? ? "Buyers’" : "Buyer’s")
-      record.errors.add :ownershipsch, I18n.t("validations.sales.property_information.ownershipsch.postcode_must_match_previous", buyer_possessive: record.joint_purchase? ? "Buyers’" : "Buyer’s")
-      record.errors.add :uprn, I18n.t("validations.sales.property_information.uprn.postcode_must_match_previous", buyer_possessive: record.joint_purchase? ? "Buyers’" : "Buyer’s")
+      joint_purchase_id = record.joint_purchase? ? "joint_purchase" : "not_joint_purchase"
+      record.errors.add :postcode_full, I18n.t("validations.sales.property_information.postcode_full.postcode_must_match_previous.#{joint_purchase_id}")
+      record.errors.add :ppostcode_full, I18n.t("validations.sales.property_information.ppostcode_full.postcode_must_match_previous.#{joint_purchase_id}")
+      record.errors.add :ownershipsch, I18n.t("validations.sales.property_information.ownershipsch.postcode_must_match_previous.#{joint_purchase_id}")
+      record.errors.add :uprn, I18n.t("validations.sales.property_information.uprn.postcode_must_match_previous.#{joint_purchase_id}")
     end
   end
 
diff --git a/config/locales/validations/sales/property_information.en.yml b/config/locales/validations/sales/property_information.en.yml
index 5a5f1c69c..e69f90edf 100644
--- a/config/locales/validations/sales/property_information.en.yml
+++ b/config/locales/validations/sales/property_information.en.yml
@@ -3,13 +3,21 @@ en:
     sales:
       property_information:
         postcode_full:
-          postcode_must_match_previous: "%{buyer_possessive} last accommodation and discounted ownership postcodes must match."
+          postcode_must_match_previous: 
+            joint_purchase: "Buyers’ last accommodation and discounted ownership postcodes must match."
+            not_joint_purchase: "Buyer’s last accommodation and discounted ownership postcodes must match."
         ppostcode_full:
-          postcode_must_match_previous: "%{buyer_possessive} last accommodation and discounted ownership postcodes must match."
+          postcode_must_match_previous: 
+            joint_purchase: "Buyers’ last accommodation and discounted ownership postcodes must match."
+            not_joint_purchase: "Buyer’s last accommodation and discounted ownership postcodes must match."
         ownershipsch:
-          postcode_must_match_previous: "%{buyer_possessive} last accommodation and discounted ownership postcodes must match."
+          postcode_must_match_previous:
+            joint_purchase: "Buyers’ last accommodation and discounted ownership postcodes must match."
+            not_joint_purchase: "Buyer’s last accommodation and discounted ownership postcodes must match."
         uprn:
-          postcode_must_match_previous: "%{buyer_possessive} last accommodation and discounted ownership postcodes must match."
+          postcode_must_match_previous: 
+            joint_purchase: "Buyers’ last accommodation and discounted ownership postcodes must match."
+            not_joint_purchase: "Buyer’s last accommodation and discounted ownership postcodes must match."
           invalid: "UPRN must be 12 digits or less."
         beds:
           bedsits_have_max_one_bedroom: "Number of bedrooms must be 1 if the property is a bedsit."