diff --git a/lambdas/modelling_e2e/Dockerfile b/applications/modelling_e2e/Dockerfile
similarity index 82%
rename from lambdas/modelling_e2e/Dockerfile
rename to applications/modelling_e2e/Dockerfile
index 0f17e99a..fa13f8ef 100644
--- a/lambdas/modelling_e2e/Dockerfile
+++ b/applications/modelling_e2e/Dockerfile
@@ -2,7 +2,7 @@ FROM public.ecr.aws/lambda/python:3.11
 
 WORKDIR /var/task
 
-COPY lambdas/modelling_e2e/requirements.txt .
+COPY applications/modelling_e2e/requirements.txt .
 RUN pip install --no-cache-dir -r requirements.txt
 
 COPY datatypes/ datatypes/
@@ -19,6 +19,6 @@ COPY tests/__init__.py tests/__init__.py
 COPY tests/orchestration/__init__.py tests/orchestration/__init__.py
 COPY tests/orchestration/fakes.py tests/orchestration/fakes.py
 
-COPY lambdas/ lambdas/
+COPY applications/ applications/
 
-CMD ["lambdas.modelling_e2e.handler.handler"]
+CMD ["applications.modelling_e2e.handler.handler"]
diff --git a/lambdas/modelling_e2e/handler.py b/applications/modelling_e2e/handler.py
similarity index 91%
rename from lambdas/modelling_e2e/handler.py
rename to applications/modelling_e2e/handler.py
index 0fed0fb4..ebea872e 100644
--- a/lambdas/modelling_e2e/handler.py
+++ b/applications/modelling_e2e/handler.py
@@ -39,6 +39,7 @@ from infrastructure.solar.google_solar_api_client import (
     BuildingInsightsNotFoundError,
     GoogleSolarApiClient,
 )
+from applications.modelling_e2e.modelling_e2e_trigger_body import ModellingE2ETriggerBody
 from repositories.geospatial.geospatial_s3_repository import (
     GeospatialS3Repository,
     ParquetReader,
@@ -102,11 +103,12 @@ def _solar_insights_for(
 
 @task_handler(task_source="modelling_e2e", source=Source.PROPERTY)
 def handler(body: dict[str, Any], context: Any) -> None:
-    property_id = int(body["property_id"])
-    portfolio_id = int(body["portfolio_id"])
-    scenario_id = int(body["scenario_id"])
-    no_solar = bool(body.get("no_solar", False))
-    dry_run = bool(body.get("dry_run", False))
+    trigger = ModellingE2ETriggerBody.model_validate(body)
+    property_id = trigger.property_id
+    portfolio_id = trigger.portfolio_id
+    scenario_id = trigger.scenario_id
+    no_solar = trigger.no_solar
+    dry_run = trigger.dry_run
 
     engine = _get_engine()
     epc_client = EpcClientService(os.environ["OPEN_EPC_API_TOKEN"])
@@ -135,7 +137,9 @@ def handler(body: dict[str, Any], context: Any) -> None:
     effective_epc = overlaid.effective_epc
 
     spatial = _spatial_for(geospatial, uprn)
-    restrictions = spatial.restrictions if spatial is not None else PlanningRestrictions()
+    restrictions = (
+        spatial.restrictions if spatial is not None else PlanningRestrictions()
+    )
     solar_insights = None if no_solar else _solar_insights_for(solar_client, spatial)
 
     with Session(engine) as session:
@@ -144,9 +148,9 @@ def handler(body: dict[str, Any], context: Any) -> None:
 
         # secondary_heating_removal is absent from the live material.type enum;
         # exclude it unconditionally until the catalogue gap is resolved.
-        considered: Optional[frozenset[MeasureType]] = (
-            frozenset(MeasureType) - {MeasureType.SECONDARY_HEATING_REMOVAL}
-        )
+        considered: Optional[frozenset[MeasureType]] = frozenset(MeasureType) - {
+            MeasureType.SECONDARY_HEATING_REMOVAL
+        }
 
         plan = run_modelling(
             effective_epc,
diff --git a/applications/modelling_e2e/modelling_e2e_trigger_body.py b/applications/modelling_e2e/modelling_e2e_trigger_body.py
new file mode 100644
index 00000000..908f9bd2
--- /dev/null
+++ b/applications/modelling_e2e/modelling_e2e_trigger_body.py
@@ -0,0 +1,11 @@
+from pydantic import BaseModel, ConfigDict
+
+
+class ModellingE2ETriggerBody(BaseModel):
+    model_config = ConfigDict(extra="allow")
+
+    property_id: int
+    portfolio_id: int
+    scenario_id: int
+    no_solar: bool = False
+    dry_run: bool = False
diff --git a/lambdas/modelling_e2e/requirements.txt b/applications/modelling_e2e/requirements.txt
similarity index 100%
rename from lambdas/modelling_e2e/requirements.txt
rename to applications/modelling_e2e/requirements.txt
diff --git a/lambdas/__init__.py b/lambdas/__init__.py
deleted file mode 100644
index e69de29b..00000000
diff --git a/lambdas/modelling_e2e/__init__.py b/lambdas/modelling_e2e/__init__.py
deleted file mode 100644
index e69de29b..00000000