diff --git a/etl/hubspot/hubspot_deal_differ.py b/etl/hubspot/hubspot_deal_differ.py
index c4e9c0148..fbdc69b61 100644
--- a/etl/hubspot/hubspot_deal_differ.py
+++ b/etl/hubspot/hubspot_deal_differ.py
@@ -206,6 +206,28 @@ class HubspotDealDiffer:
 
         return old_deal.confirmed_survey_time != new_deal.get("confirmed_survey_time")
 
+    @staticmethod
+    def check_for_abri_tenant_data_fetch(
+        new_deal: Dict[str, str],
+        new_project: Optional[ProjectData],
+        old_deal: HubspotDealData,
+    ) -> bool:
+        if not HubspotDealDiffer._is_abri_condition_deal(new_deal, new_project):
+            return False
+
+        if old_deal.expected_commencement_date is not None:
+            return False
+
+        return parse_hs_date(new_deal.get("expected_commencement_date")) is not None
+
+    @staticmethod
+    def check_for_magicplan_trigger(
+        new_deal: Dict[str, str], old_deal: HubspotDealData
+    ) -> bool:
+        new_outcome = (new_deal.get("outcome") or "").lower()
+        old_outcome = (old_deal.outcome or "").lower()
+        return new_outcome == "surveyed" and old_outcome != "surveyed"
+
     @staticmethod
     def _is_abri_condition_deal(
         new_deal: Dict[str, str], new_project: Optional[ProjectData]
@@ -219,14 +241,6 @@ class HubspotDealDiffer:
         new_project_code = (new_deal.get("project_code") or "").lower()
         return new_project_code == HubspotDealDiffer.ABRI_CONDITION_PROJECT_CODE.lower()
 
-    @staticmethod
-    def check_for_magicplan_trigger(
-        new_deal: Dict[str, str], old_deal: HubspotDealData
-    ) -> bool:
-        new_outcome = (new_deal.get("outcome") or "").lower()
-        old_outcome = (old_deal.outcome or "").lower()
-        return new_outcome == "surveyed" and old_outcome != "surveyed"
-
     @staticmethod
     def _has_valid_pashub_link(new_pashub_link: str) -> bool:
         return bool(new_pashub_link)
diff --git a/etl/hubspot/tests/test_hubspot_deal_differ.py b/etl/hubspot/tests/test_hubspot_deal_differ.py
index 544242623..660481dd2 100644
--- a/etl/hubspot/tests/test_hubspot_deal_differ.py
+++ b/etl/hubspot/tests/test_hubspot_deal_differ.py
@@ -687,6 +687,186 @@ def test_abri_survey_amendment__date_first_set_on_abri_deal__returns_false() ->
     assert result is False
 
 
+# ====================================
+# ABRI TENANT DATA FETCH TRIGGER TESTS
+# ====================================
+
+
+def test_abri_tenant_data_fetch__commencement_date_first_set_on_abri_deal__returns_true() -> (
+    None
+):
+    deal_id = uuid.uuid4()
+
+    # Arrange
+    old_deal = make_old_deal(
+        id=deal_id,
+        project_code="Abri Condition",
+        expected_commencement_date=None,
+    )
+    new_deal = make_new_deal(
+        deal_id,
+        project_code="Abri Condition",
+        expected_commencement_date="2026-08-01",
+    )
+
+    # Act
+    result = HubspotDealDiffer.check_for_abri_tenant_data_fetch(
+        new_deal=new_deal,
+        new_project=None,
+        old_deal=old_deal,
+    )
+
+    # Assert
+    assert result is True
+
+
+def test_abri_tenant_data_fetch__non_abri_deal__returns_false() -> None:
+    deal_id = uuid.uuid4()
+
+    # Arrange
+    old_deal = make_old_deal(
+        id=deal_id,
+        project_code="Southern Retrofit",
+        expected_commencement_date=None,
+    )
+    new_deal = make_new_deal(
+        deal_id,
+        project_code="Southern Retrofit",
+        expected_commencement_date="2026-08-01",
+    )
+
+    # Act
+    result = HubspotDealDiffer.check_for_abri_tenant_data_fetch(
+        new_deal=new_deal,
+        new_project=None,
+        old_deal=old_deal,
+    )
+
+    # Assert
+    assert result is False
+
+
+def test_abri_tenant_data_fetch__commencement_date_already_set__returns_false() -> None:
+    deal_id = uuid.uuid4()
+
+    # Arrange
+    old_deal = make_old_deal(
+        id=deal_id,
+        project_code="Abri Condition",
+        expected_commencement_date=datetime(2026, 7, 1, tzinfo=timezone.utc),
+    )
+    new_deal = make_new_deal(
+        deal_id,
+        project_code="Abri Condition",
+        expected_commencement_date="2026-08-01",
+    )
+
+    # Act
+    result = HubspotDealDiffer.check_for_abri_tenant_data_fetch(
+        new_deal=new_deal,
+        new_project=None,
+        old_deal=old_deal,
+    )
+
+    # Assert
+    assert result is False
+
+
+@pytest.mark.parametrize(
+    "new_overrides",
+    [
+        {},
+        {"expected_commencement_date": ""},
+        {"expected_commencement_date": "not-a-date"},
+    ],
+)
+def test_abri_tenant_data_fetch__no_parseable_new_commencement_date__returns_false(
+    new_overrides: Dict[str, str],
+) -> None:
+    deal_id = uuid.uuid4()
+
+    # Arrange
+    old_deal = make_old_deal(
+        id=deal_id,
+        project_code="Abri Condition",
+        expected_commencement_date=None,
+    )
+    new_deal = make_new_deal(
+        deal_id,
+        project_code="Abri Condition",
+        **new_overrides,
+    )
+
+    # Act
+    result = HubspotDealDiffer.check_for_abri_tenant_data_fetch(
+        new_deal=new_deal,
+        new_project=None,
+        old_deal=old_deal,
+    )
+
+    # Assert
+    assert result is False
+
+
+def test_abri_tenant_data_fetch__associated_abri_project_id__returns_true() -> None:
+    deal_id = uuid.uuid4()
+
+    # Arrange
+    old_deal = make_old_deal(
+        id=deal_id,
+        project_code="Southern Retrofit",
+        expected_commencement_date=None,
+    )
+    new_deal = make_new_deal(
+        deal_id,
+        project_code="Southern Retrofit",
+        expected_commencement_date="2026-08-01",
+    )
+    new_project = ProjectData(
+        project_id=HubspotDealDiffer.ABRI_CONDITION_ASSOCIATED_PROJECT_ID,
+        name="Abri Condition",
+    )
+
+    # Act
+    result = HubspotDealDiffer.check_for_abri_tenant_data_fetch(
+        new_deal=new_deal,
+        new_project=new_project,
+        old_deal=old_deal,
+    )
+
+    # Assert
+    assert result is True
+
+
+def test_abri_tenant_data_fetch__non_abri_project_id_with_abri_code__returns_false() -> (
+    None
+):
+    deal_id = uuid.uuid4()
+
+    # Arrange
+    old_deal = make_old_deal(
+        id=deal_id,
+        project_code="Abri Condition",
+        expected_commencement_date=None,
+    )
+    new_deal = make_new_deal(
+        deal_id,
+        project_code="Abri Condition",
+        expected_commencement_date="2026-08-01",
+    )
+    new_project = ProjectData(project_id="999999", name="Southern Retrofit")
+
+    # Act
+    result = HubspotDealDiffer.check_for_abri_tenant_data_fetch(
+        new_deal=new_deal,
+        new_project=new_project,
+        old_deal=old_deal,
+    )
+
+    # Assert
+    assert result is False
+
+
 # =======================
 # DB UPDATE TRIGGER TESTS
 # =======================