diff --git a/app/models/validations/property_validations.rb b/app/models/validations/property_validations.rb
index 8b0988dd9..2e53b8385 100644
--- a/app/models/validations/property_validations.rb
+++ b/app/models/validations/property_validations.rb
@@ -75,4 +75,12 @@ module Validations::PropertyValidations
       record.errors.add :beds, I18n.t("validations.property.beds.over_max")
     end
   end
+
+  def validate_uprn(record)
+    return unless record.uprn
+
+    return if record.uprn.match?(/^[0-9]{1,12}$/)
+
+    record.errors.add :uprn, I18n.t("validations.property.uprn.invalid")
+  end
 end
diff --git a/app/models/validations/sales/property_validations.rb b/app/models/validations/sales/property_validations.rb
index 83f86ec8f..b1bdb5b62 100644
--- a/app/models/validations/sales/property_validations.rb
+++ b/app/models/validations/sales/property_validations.rb
@@ -16,4 +16,12 @@ module Validations::Sales::PropertyValidations
       record.errors.add :beds, I18n.t("validations.property.beds.bedsits_have_max_one_bedroom")
     end
   end
+
+  def validate_uprn(record)
+    return unless record.uprn
+
+    return if record.uprn.match?(/^[0-9]{1,12}$/)
+
+    record.errors.add :uprn, I18n.t("validations.property.uprn.invalid")
+  end
 end
diff --git a/spec/models/validations/property_validations_spec.rb b/spec/models/validations/property_validations_spec.rb
index b3965b3d6..3b3e42e9e 100644
--- a/spec/models/validations/property_validations_spec.rb
+++ b/spec/models/validations/property_validations_spec.rb
@@ -290,4 +290,33 @@ RSpec.describe Validations::PropertyValidations do
       end
     end
   end
+
+  describe "#validate_uprn" do
+    context "when within length limit but alphanumeric" do
+      let(:record) { build(:sales_log, uprn: "123abc") }
+
+      it "adds an error" do
+        property_validator.validate_uprn(record)
+        expect(record.errors.added?(:uprn, "UPRN must be 12 digits or less")).to be true
+      end
+    end
+
+    context "when over the length limit" do
+      let(:record) { build(:sales_log, uprn: "1234567890123") }
+
+      it "adds an error" do
+        property_validator.validate_uprn(record)
+        expect(record.errors.added?(:uprn, "UPRN must be 12 digits or less")).to be true
+      end
+    end
+
+    context "when within the limit and only numeric" do
+      let(:record) { build(:sales_log, uprn: "123456789012") }
+
+      it "does not add an error" do
+        property_validator.validate_uprn(record)
+        expect(record.errors).not_to be_present
+      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 180f16021..af65446fc 100644
--- a/spec/models/validations/sales/property_validations_spec.rb
+++ b/spec/models/validations/sales/property_validations_spec.rb
@@ -7,7 +7,7 @@ RSpec.describe Validations::Sales::PropertyValidations do
 
   describe "#validate_postcodes_match_if_discounted_ownership" do
     context "when ownership scheme is not discounted ownership" do
-      let(:record) { FactoryBot.build(:sales_log, ownershipsch: 1) }
+      let(:record) { build(:sales_log, ownershipsch: 1) }
 
       it "when postcodes match no error is added" do
         record.postcode_full = "SW1A 1AA"
@@ -19,7 +19,7 @@ RSpec.describe Validations::Sales::PropertyValidations do
     end
 
     context "when ownership scheme is discounted ownership" do
-      let(:record) { FactoryBot.build(:sales_log, ownershipsch: 2) }
+      let(:record) { build(:sales_log, ownershipsch: 2) }
 
       it "when ppostcode_full is not present no error is added" do
         record.postcode_full = "SW1A 1AA"
@@ -51,7 +51,7 @@ RSpec.describe Validations::Sales::PropertyValidations do
 
   describe "#validate_property_unit_type" do
     context "when number of bedrooms is 1" do
-      let(:record) { FactoryBot.build(:sales_log, beds: 1, proptype: 2) }
+      let(:record) { build(:sales_log, beds: 1, proptype: 2) }
 
       it "does not add an error if it's a bedsit" do
         property_validator.validate_bedsit_number_of_beds(record)
@@ -60,7 +60,7 @@ RSpec.describe Validations::Sales::PropertyValidations do
     end
 
     context "when number of bedrooms is > 1" do
-      let(:record) { FactoryBot.build(:sales_log, beds: 2, proptype: 2) }
+      let(:record) { build(:sales_log, beds: 2, proptype: 2) }
 
       it "does add an error if it's a bedsit" do
         property_validator.validate_bedsit_number_of_beds(record)
@@ -76,7 +76,7 @@ RSpec.describe Validations::Sales::PropertyValidations do
     end
 
     context "when number of bedrooms is undefined" do
-      let(:record) { FactoryBot.build(:sales_log, beds: nil, proptype: 2) }
+      let(:record) { build(:sales_log, beds: nil, proptype: 2) }
 
       it "does not add an error if it's a bedsit" do
         property_validator.validate_bedsit_number_of_beds(record)
@@ -84,4 +84,33 @@ RSpec.describe Validations::Sales::PropertyValidations do
       end
     end
   end
+
+  describe "#validate_uprn" do
+    context "when within length limit but alphanumeric" do
+      let(:record) { build(:sales_log, uprn: "123abc") }
+
+      it "adds an error" do
+        property_validator.validate_uprn(record)
+        expect(record.errors.added?(:uprn, "UPRN must be 12 digits or less")).to be true
+      end
+    end
+
+    context "when over the length limit" do
+      let(:record) { build(:sales_log, uprn: "1234567890123") }
+
+      it "adds an error" do
+        property_validator.validate_uprn(record)
+        expect(record.errors.added?(:uprn, "UPRN must be 12 digits or less")).to be true
+      end
+    end
+
+    context "when within the limit and only numeric" do
+      let(:record) { build(:sales_log, uprn: "123456789012") }
+
+      it "does not add an error" do
+        property_validator.validate_uprn(record)
+        expect(record.errors).not_to be_present
+      end
+    end
+  end
 end