diff --git a/app/models/form/lettings/questions/address_line1.rb b/app/models/form/lettings/questions/address_line1.rb
index 2f88b210e..c96e8db1e 100644
--- a/app/models/form/lettings/questions/address_line1.rb
+++ b/app/models/form/lettings/questions/address_line1.rb
@@ -18,5 +18,11 @@ class Form::Lettings::Questions::AddressLine1 < ::Form::Question
     ].select(&:present?).join("\n")
   end
 
+  def unanswered_error_message(log = nil)
+    return super unless log&.is_supported_housing?
+
+    I18n.t("validations.lettings.property.address_line1.not_answered_supported_housing")
+  end
+
   QUESTION_NUMBER_FROM_YEAR = { 2023 => 12, 2024 => 13, 2025 => 17, 2026 => 17 }.freeze
 end
diff --git a/config/locales/validations/lettings/property_information.en.yml b/config/locales/validations/lettings/property_information.en.yml
index e40b92f64..5de2ad613 100644
--- a/config/locales/validations/lettings/property_information.en.yml
+++ b/config/locales/validations/lettings/property_information.en.yml
@@ -4,6 +4,8 @@ en:
       property:
         address:
           not_answered_supported_housing: "You must enter address. If your letting is in a confidential scheme, please check the scheme you chose in the ‘Set up this lettings log’ section. If a scheme needs updating to mark it as confidential, a CORE coordinator in your organisation can do this."
+        address_line1:
+          not_answered_supported_housing: "You must enter address line 1. If your letting is in a confidential scheme, please check the scheme you chose in the ‘Set up this lettings log’ section. If a scheme needs updating to mark it as confidential, a CORE coordinator in your organisation can do this."
         postcode_full:
           invalid: "Enter a postcode in the correct format, for example AA1 1AA."
           not_in_england: "It looks like you have an entered a postcode outside of England. Only create logs for lettings in England."
diff --git a/spec/models/form/lettings/questions/address_line1_spec.rb b/spec/models/form/lettings/questions/address_line1_spec.rb
index 212e3be9b..ce4903c0d 100644
--- a/spec/models/form/lettings/questions/address_line1_spec.rb
+++ b/spec/models/form/lettings/questions/address_line1_spec.rb
@@ -38,4 +38,34 @@ RSpec.describe Form::Lettings::Questions::AddressLine1, type: :model do
   it "has the correct check_answers_card_number" do
     expect(question.check_answers_card_number).to be_nil
   end
+
+  describe "#unanswered_error_message" do
+    context "when the log is supported housing" do
+      let(:log) { build(:lettings_log, needstype: 2) }
+
+      it "returns the confidential-scheme guidance message" do
+        expect(question.unanswered_error_message(log)).to eq(
+          "You must enter address line 1. If your letting is in a confidential scheme, please check the scheme you chose in the ‘Set up this lettings log’ section. If a scheme needs updating to mark it as confidential, a CORE coordinator in your organisation can do this.",
+        )
+      end
+    end
+
+    context "when the log is general needs" do
+      let(:log) { build(:lettings_log, needstype: 1) }
+
+      it "returns the default unanswered message" do
+        expect(question.unanswered_error_message(log)).to eq(
+          I18n.t("validations.not_answered", question: question.error_display_label.downcase),
+        )
+      end
+    end
+
+    context "when no log is given" do
+      it "returns the default unanswered message" do
+        expect(question.unanswered_error_message).to eq(
+          I18n.t("validations.not_answered", question: question.error_display_label.downcase),
+        )
+      end
+    end
+  end
 end