From 73692e96ee68738a8d7daaf4b637c8176a9daf08 Mon Sep 17 00:00:00 2001
From: Khalim Conn-Kowlessar <kconnkowlessar@gmail.com>
Date: Mon, 2 Feb 2026 14:17:18 +0000
Subject: [PATCH] added sloping ceiling description and notes of efficiency
 categorisations

---
 backend/onboarders/epc_descriptions.py |  6 ++++--
 backend/onboarders/parity.py           | 13 +++++++++++++
 2 files changed, 17 insertions(+), 2 deletions(-)

diff --git a/backend/onboarders/epc_descriptions.py b/backend/onboarders/epc_descriptions.py
index a4f0be13..280b180f 100644
--- a/backend/onboarders/epc_descriptions.py
+++ b/backend/onboarders/epc_descriptions.py
@@ -168,9 +168,11 @@ class EpcRoofDescriptions(Enum):
     thatched = "Thatched"  # We see this for no insulation, has average performance
     thatched_with_additional_insulation: str = "Thatched, with additional insulation"
 
-    # TODO:
     # Sloping ceiling
-    # Pitched, as built
+    # For sloping ceiling tags, we don't use any (assumed) tags so that it's unambiguous that the roof is sloped
+    sloping_pitched_no_insulation: str = "Pithced, no insulation"
+    sloping_pitched_limited_insulation: str = "Pitched, limited insulation"
+    sloping_pitched_insulated: str = "Pitched, insulated"
 
 
 class EpcEfficiency(Enum):
diff --git a/backend/onboarders/parity.py b/backend/onboarders/parity.py
index 988ee01e..cb9b4f7f 100644
--- a/backend/onboarders/parity.py
+++ b/backend/onboarders/parity.py
@@ -304,6 +304,19 @@ roof_aggs = data[["Roof Construction", "Roof Insulation"]].drop_duplicates().to_
     {'Roof Construction': 'PitchedWithSlopingCeiling', 'Roof Insulation': 'NoInsulation'},
     {'Roof Construction': 'PitchedWithSlopingCeiling', 'Roof Insulation': 'Unknown'},
 
+    # Sloping ceiling:
+    # With measured insulation
+    # 12mm insulation: Pitched, limited insulation, Very Poor
+    # 25mm, 50mm insulation: Pitched, limited insulation, Poor
+    # 75mm - 125mm, Pitched, insulated, average
+    # 150mm - 250mm, Pitched, insulated, good
+    # 270mm+, Pitched, insulated, very good
+    # As built / unknown:
+    # before 1900, 1900-1929, 1930-1949, 1950-1966, 1967-1975,  -> Pitched, no insulation, Very Poor
+    # 1976-1982 -> Pitched, limited insulation, Poor
+    # 1983-1990, to 1996-2002 Pitched, insulated, Average
+    # 2003 - 2006, 2012-2022 -> Pitched, insulated, Good
+    # 2023 onwards -> Pitched, insulated, Very Good
 ]
 
 roof_mapping = {