diff --git a/model_data/recommendations/WallRecommendations.py b/model_data/recommendations/WallRecommendations.py
index e4915716..2b754d65 100644
--- a/model_data/recommendations/WallRecommendations.py
+++ b/model_data/recommendations/WallRecommendations.py
@@ -1,3 +1,5 @@
+import math
+
 from model_data.Property import Property
 import pandas as pd
 
@@ -19,8 +21,11 @@ wall_parts = [
 class WallRecommendations:
     YEAR_WALLS_BUILT_WITH_INSULATION = 1990
     U_VALUE_UNIT = 'w/m-¦k'
-    BUILDING_REGULATIONS_NEW_BUILD_L_MAX_U_VALUE = 0.18
-    BUILDING_REGULATIONS_EXISTING_BUILD_L_MAX_U_VALUE = 0.3
+    BUILDING_REGULATIONS_PART_L_MAX_U_VALUE = 0.18
+
+    # Add some error so that if, for example, a new part we recommend provides a u-value of 0.19,
+    # we still consider it as an option
+    U_VALUE_ERROR = 0.01
 
     def __init__(self, property_instance: Property):
         self.property = property_instance
@@ -54,12 +59,13 @@ class WallRecommendations:
                 raise NotImplementedError("Haven't handled the case of other u value units yet")
 
             if (not is_cavity_wall) and (self.year_built >= self.YEAR_WALLS_BUILT_WITH_INSULATION) and (
-                u_value >= self.BUILDING_REGULATIONS_EXISTING_BUILD_L_MAX_U_VALUE
+                u_value >= self.BUILDING_REGULATIONS_PART_L_MAX_U_VALUE
             ):
                 # Recommend internal wall insulation
                 iwi_parts = [part for part in wall_parts if part["type"] == "internal_wall_insulation"]
                 for part in iwi_parts:
                     _, new_u_value = self.calculate_u_value_uplift(u_value, part["u_value"])
+                    new_u_value = round(new_u_value, 2)
 
                     self.recommendations.append(
                         {