diff --git a/etl/xml_survey_extraction/XmlParser.py b/etl/xml_survey_extraction/XmlParser.py
index a2246629..f8f2285d 100644
--- a/etl/xml_survey_extraction/XmlParser.py
+++ b/etl/xml_survey_extraction/XmlParser.py
@@ -9,7 +9,8 @@ from etl.xml_survey_extraction.pcdb import heating_data
 PROPERTY_TYPE_LOOKUP = {
     "0": "House",
     "House": "House",
-    "2": "Flat"
+    "2": "Flat",
+    "3": "Maisonette",
 }
 
 
@@ -122,6 +123,7 @@ class XmlParser:
     }
 
     TRANSACTION_TYPE_MAP = {
+        "5": "Rented (social)",
         "13": "ECO assessment",
         "14": "Stock condition survey",
     }
@@ -134,7 +136,8 @@ class XmlParser:
 
     TARIFF_MAP = {
         "1": "Dual",
-        "2": "Single"
+        "2": "Single",
+        "3": "Unknown"
     }
 
     def __init__(self, file, filekey, surveyor_company, uprn=None):
@@ -408,7 +411,7 @@ class XmlParser:
             # We discount 10% of the wall area
             insulation_wall_area = wall_areas * 0.9
         else:
-            insulation_wall_area = wall_areas - window_areas
+            insulation_wall_area = wall_areas - sum(window_areas)
         return insulation_wall_area
 
     def extract_additional_data(self):
@@ -779,6 +782,7 @@ class XmlParser:
         """
 
         glazing_type_lookup = {
+            "2": "double glazing installed during or after 2002",
             "3": "double glazing, unknown install date",
             "5": "Single glazing",
         }