diff --git a/backend/documents_parser/parser.py b/backend/documents_parser/parser.py
index cff21e0ef..57426ab87 100644
--- a/backend/documents_parser/parser.py
+++ b/backend/documents_parser/parser.py
@@ -1,4 +1,4 @@
-from typing import List
+from typing import List, Optional
 
 from datatypes.epc.domain.epc_property_data import EpcPropertyData
 from datatypes.epc.domain.mapper import EpcPropertyDataMapper
@@ -8,13 +8,15 @@ from backend.documents_parser.extractor import PasHubRdSapSiteNotesExtractor
 from backend.documents_parser.pdf import pdf_to_pages, pdf_to_text_list
 
 
-def parse_site_notes_pdf(file_path: str) -> EpcPropertyData:
+def parse_site_notes_pdf(
+    file_path: str, uprn: Optional[int] = None
+) -> EpcPropertyData:
     with open(file_path, "rb") as f:
         pdf_bytes = f.read()
     pages = pdf_to_pages(pdf_bytes)
     if "Elmhurst Energy Systems" in "\n".join(pages):
         return _parse_elmhurst(pages)
-    return _parse_pashub(pdf_bytes)
+    return _parse_pashub(pdf_bytes, uprn=uprn)
 
 
 def _parse_elmhurst(pages: List[str]) -> EpcPropertyData:
@@ -22,7 +24,9 @@ def _parse_elmhurst(pages: List[str]) -> EpcPropertyData:
     return EpcPropertyDataMapper.from_elmhurst_site_notes(site_notes)
 
 
-def _parse_pashub(pdf_bytes: bytes) -> EpcPropertyData:
+def _parse_pashub(
+    pdf_bytes: bytes, uprn: Optional[int] = None
+) -> EpcPropertyData:
     tokens = pdf_to_text_list(pdf_bytes)
     site_notes = PasHubRdSapSiteNotesExtractor(tokens).extract()
-    return EpcPropertyDataMapper.from_site_notes(site_notes)
+    return EpcPropertyDataMapper.from_site_notes(site_notes, uprn=uprn)
diff --git a/backend/pashub_fetcher/pashub_service.py b/backend/pashub_fetcher/pashub_service.py
index 64c2f6aed..87caa89b8 100644
--- a/backend/pashub_fetcher/pashub_service.py
+++ b/backend/pashub_fetcher/pashub_service.py
@@ -32,6 +32,7 @@ class _FileUploadRecord(NamedTuple):
     file_path: str
     file_type: Optional[str]
     uploaded_file_id: int
+    uprn: Optional[int]
 
 
 class PashubService:
@@ -149,6 +150,10 @@ class PashubService:
             else f"documents/hubspot_deal_id/{hubspot_deal_id}"
         )
 
+        # Coerce the service-held UPRN string to an int in exactly one place so
+        # the site-notes row's UPRN cannot diverge from the UploadedFile row's.
+        uprn_int: Optional[int] = int(uprn) if uprn else None
+
         file_paths: List[str] = []
         uploaded_files: List[UploadedFile] = []
 
@@ -162,7 +167,7 @@ class PashubService:
                 s3_file_bucket=self._s3_bucket,
                 s3_file_key=file_key,
                 s3_upload_timestamp=datetime.now(timezone.utc),
-                uprn=int(uprn) if uprn else None,
+                uprn=uprn_int,
                 hubspot_deal_id=hubspot_deal_id,
                 file_source=file_source.value,
                 file_type=get_file_type_string(filename, df.evidence_category) or default_file_type,
@@ -178,6 +183,7 @@ class PashubService:
                     file_path=fp,
                     file_type=cast(Optional[str], uf.file_type),
                     uploaded_file_id=cast(int, uf.id),
+                    uprn=uprn_int,
                 )
                 for fp, uf in zip(file_paths, uploaded_files)
             ]
@@ -192,7 +198,9 @@ class PashubService:
             ):
                 continue
             try:
-                epc_data: EpcPropertyData = parse_site_notes_pdf(record.file_path)
+                epc_data: EpcPropertyData = parse_site_notes_pdf(
+                    record.file_path, uprn=record.uprn
+                )
                 with db_session() as session:
                     save_epc_property_data(
                         session, epc_data, uploaded_file_id=record.uploaded_file_id
diff --git a/datatypes/epc/domain/mapper.py b/datatypes/epc/domain/mapper.py
index 83e232245..ad9883bc3 100644
--- a/datatypes/epc/domain/mapper.py
+++ b/datatypes/epc/domain/mapper.py
@@ -280,7 +280,9 @@ def _map_schema_21_pv(
 class EpcPropertyDataMapper:
 
     @staticmethod
-    def from_site_notes(survey: PasHubRdSapSiteNotes) -> EpcPropertyData:
+    def from_site_notes(
+        survey: PasHubRdSapSiteNotes, uprn: Optional[int] = None
+    ) -> EpcPropertyData:
         general = survey.general
         metadata = survey.inspection_metadata
         address_parts = [p.strip() for p in metadata.property_address.split(", ")]
@@ -336,6 +338,7 @@ class EpcPropertyDataMapper:
         )  # TODO: verify that is the correct approach
 
         return EpcPropertyData(
+            uprn=uprn,
             dwelling_type=f"{general.detachment_type} {general.property_type.lower()}",
             inspection_date=general.inspection_date,
             tenure=general.tenure,
diff --git a/datatypes/epc/domain/tests/test_from_site_notes.py b/datatypes/epc/domain/tests/test_from_site_notes.py
index 5cb29b698..bde715237 100644
--- a/datatypes/epc/domain/tests/test_from_site_notes.py
+++ b/datatypes/epc/domain/tests/test_from_site_notes.py
@@ -723,6 +723,29 @@ class TestUnmeasurableWallThickness:
         assert result.sap_building_parts[0].wall_thickness_mm is None
 
 
+class TestFromSiteNotesUprnInjection:
+    """Site notes never carry a UPRN natively, but the PasHub path can inject a
+    UPRN the service has already resolved. A supplied UPRN must land on the
+    resulting EpcPropertyData; the default (none supplied) must yield no UPRN.
+    """
+
+    @pytest.fixture
+    def survey(self) -> PasHubRdSapSiteNotes:
+        return from_dict(
+            PasHubRdSapSiteNotes, load("pashub_rdsap_site_notes_example1.json")
+        )
+
+    def test_supplied_uprn_lands_on_result(
+        self, survey: PasHubRdSapSiteNotes
+    ) -> None:
+        result = EpcPropertyDataMapper.from_site_notes(survey, uprn=100010344955)
+        assert result.uprn == 100010344955
+
+    def test_default_yields_no_uprn(self, survey: PasHubRdSapSiteNotes) -> None:
+        result = EpcPropertyDataMapper.from_site_notes(survey)
+        assert result.uprn is None
+
+
 class TestElmhurstSecondaryFuelFromSapCode:
     """`_elmhurst_secondary_fuel_from_sap_code` must RAISE on an unmapped
     fuel-fired Table 4a Category-10 room-heater code rather than return