diff --git a/app/services/bulk_upload/lettings/year2025/row_parser.rb b/app/services/bulk_upload/lettings/year2025/row_parser.rb
index e4e3710fc..3953d7afb 100644
--- a/app/services/bulk_upload/lettings/year2025/row_parser.rb
+++ b/app/services/bulk_upload/lettings/year2025/row_parser.rb
@@ -443,6 +443,7 @@ class BulkUpload::Lettings::Year2025::RowParser
 
   validate :validate_incomplete_soft_validations, on: :after_log
   validate :validate_nationality, on: :after_log
+  validate :validate_reasonpref_reason_values, on: :after_log
 
   validate :validate_nulls, on: :after_log
 
@@ -676,6 +677,17 @@ private
     end
   end
 
+  def validate_reasonpref_reason_values
+    valid_reasonpref_reason_options = %w[0 1]
+    %w[field_107 field_108 field_109 field_110 field_111].each do |field|
+      next unless send(field).present? && !valid_reasonpref_reason_options.include?(send(field).to_s)
+
+      question_text = QUESTIONS[field.to_sym]
+      question_text[0] = question_text[0].downcase
+      errors.add(field.to_sym, I18n.t("#{ERROR_BASE_KEY}.invalid_option", question: question_text))
+    end
+  end
+
   def duplicate_check_fields
     [
       "startdate",
diff --git a/spec/services/bulk_upload/lettings/year2025/row_parser_spec.rb b/spec/services/bulk_upload/lettings/year2025/row_parser_spec.rb
index 9882c4d8f..a822d6f2a 100644
--- a/spec/services/bulk_upload/lettings/year2025/row_parser_spec.rb
+++ b/spec/services/bulk_upload/lettings/year2025/row_parser_spec.rb
@@ -1083,6 +1083,19 @@ RSpec.describe BulkUpload::Lettings::Year2025::RowParser do
           expect(parser.errors[:field_111]).to be_present
         end
       end
+
+      context "when some reasonable preference options are set as invalid values" do
+        let(:attributes) { setup_section_params.merge({ bulk_upload:, field_106: "2", field_107: "2", field_108: "3", field_109: "2", field_110: "3", field_111: "-4" }) }
+
+        it "adds errors" do
+          parser.valid?
+          expect(parser.errors[:field_107]).to be_present
+          expect(parser.errors[:field_108]).to be_present
+          expect(parser.errors[:field_109]).to be_present
+          expect(parser.errors[:field_110]).to be_present
+          expect(parser.errors[:field_111]).to be_present
+        end
+      end
     end
 
     describe "#field_116" do # referral