diff --git a/datatypes/epc/domain/mapper.py b/datatypes/epc/domain/mapper.py
index 5720d323..ab931305 100644
--- a/datatypes/epc/domain/mapper.py
+++ b/datatypes/epc/domain/mapper.py
@@ -1751,6 +1751,12 @@ def _map_elmhurst_window(w: ElmhurstWindow) -> SapWindow:
         window_location=w.building_part,
         window_wall_type=w.location,
         permanent_shutters_present=w.permanent_shutters,
+        frame_factor=w.frame_factor,
+        window_transmission_details=WindowTransmissionDetails(
+            u_value=w.u_value,
+            solar_transmittance=w.g_value,
+            data_source=w.data_source,
+        ),
     )