diff --git a/app/models/validations/property_validations.rb b/app/models/validations/property_validations.rb
index 09e6d1436..4518ea082 100644
--- a/app/models/validations/property_validations.rb
+++ b/app/models/validations/property_validations.rb
@@ -46,4 +46,15 @@ module Validations::PropertyValidations
       record.errors.add :postcode_full, :wrong_format, message: error_message
     end
   end
+
+  def validate_la_in_england(record)
+    return unless record.form.start_year_2025_or_later? && record.la.present?
+    return if record.la.in?(LocalAuthority.england.pluck(:code))
+
+    record.errors.add :la, I18n.t("validations.lettings.property.la.not_in_england")
+    record.errors.add :postcode_full, I18n.t("validations.lettings.property.postcode_full.not_in_england")
+    record.errors.add :uprn, I18n.t("validations.lettings.property.uprn.not_in_england")
+    record.errors.add :uprn_confirmation, I18n.t("validations.lettings.property.uprn_confirmation.not_in_england")
+    record.errors.add :uprn_selection, I18n.t("validations.lettings.property.uprn_selection.not_in_england")
+  end
 end
diff --git a/app/models/validations/sales/property_validations.rb b/app/models/validations/sales/property_validations.rb
index 5cf70ed8d..0c6ea1b67 100644
--- a/app/models/validations/sales/property_validations.rb
+++ b/app/models/validations/sales/property_validations.rb
@@ -36,4 +36,15 @@ module Validations::Sales::PropertyValidations
       record.errors.add :postcode_full, :wrong_format, message: error_message
     end
   end
+  
+  def validate_la_in_england(record)
+    return unless record.form.start_year_2025_or_later? && record.la.present?
+    return if record.la.in?(LocalAuthority.england.pluck(:code))
+
+    record.errors.add :la, I18n.t("validations.sales.property_information.la.not_in_england")
+    record.errors.add :postcode_full, I18n.t("validations.sales.property_information.postcode_full.not_in_england")
+    record.errors.add :uprn, I18n.t("validations.sales.property_information.uprn.not_in_england")
+    record.errors.add :uprn_confirmation, I18n.t("validations.sales.property_information.uprn_confirmation.not_in_england")
+    record.errors.add :uprn_selection, I18n.t("validations.sales.property_information.uprn_selection.not_in_england")
+  end
 end
diff --git a/config/locales/validations/lettings/property_information.en.yml b/config/locales/validations/lettings/property_information.en.yml
index 6530c9488..068b8f15c 100644
--- a/config/locales/validations/lettings/property_information.en.yml
+++ b/config/locales/validations/lettings/property_information.en.yml
@@ -4,6 +4,7 @@ en:
       property:
         postcode_full:
           invalid: "Enter a postcode in the correct format, for example AA1 1AA."
+          not_in_england: "It looks like you have entered a postcode for a local authority outside of England - only submit Lettings forms for Lettings that occur in England"
         rsnvac:
           non_temp_accommodation: "Answer cannot be re-let to tenant who occupied the same property as temporary accommodation as this accommodation is not temporary."
           referral_invalid: "Answer cannot be re-let to tenant who occupied the same property as temporary accommodation as a different source of referral for this letting."
@@ -18,4 +19,10 @@ en:
           one_seven_bedroom_shared: "A shared house must have 1 to 7 bedrooms."
         uprn:
           invalid: "UPRN must be 12 digits or less."
-        
+          not_in_england: "It looks like you have entered a UPRN for a local authority outside of England - only submit Lettings forms for Lettings that occur in England"
+        uprn_confirmation:
+          not_in_england: "It looks like you have entered a UPRN for a local authority outside of England - only submit Lettings forms for Lettings that occur in England"
+        uprn_selection:
+          not_in_england: "It looks like you have selected an address for a local authority outside of England - only submit Lettings forms for Lettings that occur in England"
+        la:
+          not_in_england: "It looks like you have entered a local authority outside of England - only submit Lettings forms for Lettings that occur in England"
diff --git a/config/locales/validations/sales/property_information.en.yml b/config/locales/validations/sales/property_information.en.yml
index a91e47849..8bfefbd6d 100644
--- a/config/locales/validations/sales/property_information.en.yml
+++ b/config/locales/validations/sales/property_information.en.yml
@@ -7,6 +7,7 @@ en:
             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: "Enter a postcode in the correct format, for example AA1 1AA."
+          not_in_england: "It looks like you have entered a postcode for a local authority outside of England - only submit Sales forms for Sales that occur in England"
         ppostcode_full:
           postcode_must_match_previous:
             joint_purchase: "Buyers’ last accommodation and discounted ownership postcodes must match."
@@ -20,9 +21,16 @@ en:
             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."
+          not_in_england: "It looks like you have entered a UPRN for a local authority outside of England - only submit Sales forms for Sales that occur in England"
         beds:
           bedsits_have_max_one_bedroom: "Number of bedrooms must be 1 if the property is a bedsit."
         proptype:
           bedsits_have_max_one_bedroom: "Answer cannot be 'Bedsit' if the property has 2 or more bedrooms."
         uprn_known:
           invalid: "You must answer UPRN known?"
+        la:
+          not_in_england: "It looks like you have entered a local authority outside of England - only submit Sales forms for Sales that occur in England"
+        uprn_confirmation:
+          not_in_england: "It looks like you have entered a UPRN for a local authority outside of England - only submit Sales forms for Sales that occur in England"
+        uprn_selection:
+          not_in_england: "It looks like you have selected an address for a local authority outside of England - only submit Sales forms for Sales that occur in England"
diff --git a/spec/models/validations/property_validations_spec.rb b/spec/models/validations/property_validations_spec.rb
index f478ae466..ac22423b4 100644
--- a/spec/models/validations/property_validations_spec.rb
+++ b/spec/models/validations/property_validations_spec.rb
@@ -204,4 +204,57 @@ RSpec.describe Validations::PropertyValidations do
       end
     end
   end
+
+  describe "#validate_la_in_england" do
+    context "with a log on or after 2025" do
+      before do
+        allow(log.form).to receive(:start_year_2025_or_later?).and_return true
+      end
+
+      context "and the local authority is not in England" do
+        let(:log) { build(:lettings_log, la: "S12000019") }
+
+        it "adds an error" do
+          property_validator.validate_la_in_england(log)
+          expect(log.errors["la"]).to include(I18n.t("validations.lettings.property.la.not_in_england"))
+          expect(log.errors["postcode_full"]).to include(I18n.t("validations.lettings.property.postcode_full.not_in_england"))
+          expect(log.errors["uprn"]).to include(I18n.t("validations.lettings.property.uprn.not_in_england"))
+          expect(log.errors["uprn_confirmation"]).to include(I18n.t("validations.lettings.property.uprn_confirmation.not_in_england"))
+          expect(log.errors["uprn_selection"]).to include(I18n.t("validations.lettings.property.uprn_selection.not_in_england"))
+        end
+      end
+
+      context "and the local authority is in England" do
+        let(:log) { build(:lettings_log, la: "E06000002") }
+
+        it "does not add an error" do
+          property_validator.validate_la_in_england(log)
+          expect(log.errors["la"]).to be_empty
+          expect(log.errors["postcode_full"]).to be_empty
+          expect(log.errors["uprn"]).to be_empty
+          expect(log.errors["uprn_confirmation"]).to be_empty
+          expect(log.errors["uprn_selection"]).to be_empty
+        end
+      end
+    end
+
+    context "with a log before 2025" do
+      before do
+        allow(log.form).to receive(:start_year_2025_or_later?).and_return false
+      end
+
+      context "and the local authority is not in England" do
+        let(:log) { build(:lettings_log, la: "S12000019") }
+
+        it "does not add an error" do
+          property_validator.validate_la_in_england(log)
+          expect(log.errors["la"]).to be_empty
+          expect(log.errors["postcode_full"]).to be_empty
+          expect(log.errors["uprn"]).to be_empty
+          expect(log.errors["uprn_confirmation"]).to be_empty
+          expect(log.errors["uprn_selection"]).to be_empty
+        end
+      end
+    end
+  end
 end
diff --git a/spec/models/validations/sales/property_validations_spec.rb b/spec/models/validations/sales/property_validations_spec.rb
index df0396845..68b23f593 100644
--- a/spec/models/validations/sales/property_validations_spec.rb
+++ b/spec/models/validations/sales/property_validations_spec.rb
@@ -142,4 +142,57 @@ RSpec.describe Validations::Sales::PropertyValidations do
       end
     end
   end
+
+  describe "#validate_la_in_england" do
+    context "with a log on or after 2025" do
+      before do
+        allow(log.form).to receive(:start_year_2025_or_later?).and_return true
+      end
+
+      context "and the local authority is not in England" do
+        let(:log) { build(:lettings_log, la: "S12000019") }
+
+        it "adds an error" do
+          property_validator.validate_la_in_england(log)
+          expect(log.errors["la"]).to include(I18n.t("validations.sales.property_information.la.not_in_england"))
+          expect(log.errors["postcode_full"]).to include(I18n.t("validations.sales.property_information.postcode_full.not_in_england"))
+          expect(log.errors["uprn"]).to include(I18n.t("validations.sales.property_information.uprn.not_in_england"))
+          expect(log.errors["uprn_confirmation"]).to include(I18n.t("validations.sales.property_information.uprn_confirmation.not_in_england"))
+          expect(log.errors["uprn_selection"]).to include(I18n.t("validations.sales.property_information.uprn_selection.not_in_england"))
+        end
+      end
+
+      context "and the local authority is in England" do
+        let(:log) { build(:lettings_log, la: "E06000002") }
+
+        it "does not add an error" do
+          property_validator.validate_la_in_england(log)
+          expect(log.errors["la"]).to be_empty
+          expect(log.errors["postcode_full"]).to be_empty
+          expect(log.errors["uprn"]).to be_empty
+          expect(log.errors["uprn_confirmation"]).to be_empty
+          expect(log.errors["uprn_selection"]).to be_empty
+        end
+      end
+    end
+
+    context "with a log before 2025" do
+      before do
+        allow(log.form).to receive(:start_year_2025_or_later?).and_return false
+      end
+
+      context "and the local authority is not in England" do
+        let(:log) { build(:lettings_log, la: "S12000019") }
+
+        it "does not add an error" do
+          property_validator.validate_la_in_england(log)
+          expect(log.errors["la"]).to be_empty
+          expect(log.errors["postcode_full"]).to be_empty
+          expect(log.errors["uprn"]).to be_empty
+          expect(log.errors["uprn_confirmation"]).to be_empty
+          expect(log.errors["uprn_selection"]).to be_empty
+        end
+      end
+    end
+  end
 end