diff --git a/app/services/bulk_upload/lettings/year2023/row_parser.rb b/app/services/bulk_upload/lettings/year2023/row_parser.rb
index 69dc6aeca..e4ba7cb82 100644
--- a/app/services/bulk_upload/lettings/year2023/row_parser.rb
+++ b/app/services/bulk_upload/lettings/year2023/row_parser.rb
@@ -939,6 +939,13 @@ private
 
     attributes["first_time_property_let_as_social_housing"] = first_time_property_let_as_social_housing
 
+    attributes["uprn_known"] = field_18.present? ? 1 : 0
+    attributes["uprn"] = field_18
+    attributes["address_line1"] = field_19
+    attributes["address_line2"] = field_20
+    attributes["town_or_city"] = field_21
+    attributes["county"] = field_22
+
     attributes
   end
 
diff --git a/spec/services/bulk_upload/lettings/year2023/row_parser_spec.rb b/spec/services/bulk_upload/lettings/year2023/row_parser_spec.rb
index 53cd24ed8..997624757 100644
--- a/spec/services/bulk_upload/lettings/year2023/row_parser_spec.rb
+++ b/spec/services/bulk_upload/lettings/year2023/row_parser_spec.rb
@@ -63,6 +63,9 @@ RSpec.describe BulkUpload::Lettings::Year2023::RowParser do
       stub_request(:get, /api.postcodes.io/)
       .to_return(status: 200, body: "{\"status\":200,\"result\":{\"admin_district\":\"Manchester\", \"codes\":{\"admin_district\": \"E08000003\"}}}", headers: {})
 
+      stub_request(:get, "https://api.os.uk/search/places/v1/uprn?key=OS_DATA_KEY&uprn=100023336956")
+        .to_return(status: 200, body: "{}", headers: {})
+
       parser.valid?
     end
 
@@ -198,6 +201,8 @@ RSpec.describe BulkUpload::Lettings::Year2023::RowParser do
             field_35: now.strftime("%g"),
 
             field_4: "1",
+
+            field_18: "100023336956",
           }
         end
 
@@ -689,6 +694,64 @@ RSpec.describe BulkUpload::Lettings::Year2023::RowParser do
   end
 
   describe "#log" do
+    describe "#uprn" do
+      let(:attributes) { { bulk_upload:, field_18: "100023336956" } }
+
+      it "sets to given value" do
+        expect(parser.log.uprn).to eql("100023336956")
+      end
+    end
+
+    describe "#uprn_known" do
+      context "when uprn specified" do
+        let(:attributes) { { bulk_upload:, field_18: "100023336956" } }
+
+        it "sets to 1" do
+          expect(parser.log.uprn_known).to be(1)
+        end
+      end
+
+      context "when uprn blank" do
+        let(:attributes) { { bulk_upload:, field_18: "" } }
+
+        it "sets to 0" do
+          expect(parser.log.uprn_known).to be(0)
+        end
+      end
+    end
+
+    describe "#address_line1" do
+      let(:attributes) { { bulk_upload:, field_19: "123 Sesame Street" } }
+
+      it "sets to given value" do
+        expect(parser.log.address_line1).to eql("123 Sesame Street")
+      end
+    end
+
+    describe "#address_line2" do
+      let(:attributes) { { bulk_upload:, field_20: "Cookie Town" } }
+
+      it "sets to given value" do
+        expect(parser.log.address_line2).to eql("Cookie Town")
+      end
+    end
+
+    describe "#town_or_city" do
+      let(:attributes) { { bulk_upload:, field_21: "London" } }
+
+      it "sets to given value" do
+        expect(parser.log.town_or_city).to eql("London")
+      end
+    end
+
+    describe "#county" do
+      let(:attributes) { { bulk_upload:, field_22: "Greater London" } }
+
+      it "sets to given value" do
+        expect(parser.log.county).to eql("Greater London")
+      end
+    end
+
     [
       %w[age1_known age1 field_46],
       %w[age2_known age2 field_52],
diff --git a/spec/support/bulk_upload/log_to_csv.rb b/spec/support/bulk_upload/log_to_csv.rb
index 86167376d..a2d8c2f5f 100644
--- a/spec/support/bulk_upload/log_to_csv.rb
+++ b/spec/support/bulk_upload/log_to_csv.rb
@@ -29,11 +29,11 @@ class BulkUpload::LogToCsv
     to_2022_row + [
       log.needstype,
       log.location&.id,
-      nil, # uprn,
-      nil, # address_line_1,
-      nil, # address_line_2,
-      nil, # town_or_city,
-      nil, # county,
+      log.uprn,
+      log.address_line1,
+      log.address_line2,
+      log.town_or_city,
+      log.county,
     ]
   end