diff --git a/epc_data/cleaning/Floor.py b/epc_data/cleaning/Floor.py
index 9decf67d..1dd165ab 100644
--- a/epc_data/cleaning/Floor.py
+++ b/epc_data/cleaning/Floor.py
@@ -1,27 +1,35 @@
-from typing import Dict, Union
+from typing import Dict, Union, Optional
 from epc_data.cleaning.cleaning_utils import extract_thermal_transmittence, search_split_description
 
 
 class CleanFloor:
 
-    def __init__(self, description):
+    def __init__(self, description: str):
+        """
+        Constructor for CleanFloor class.
+
+        :param description: Description to be cleaned.
+        """
         self.description: str = description
 
     def clean(self) -> Dict[str, Union[str, bool, int, None]]:
         """
+        Cleans the given description based on predefined rules.
 
-        :return:
+        :return: Cleaned data in a dictionary format.
         """
 
         description_lower = self.description.lower().strip()
 
-        assumed = "assumed" in description_lower
-        to_unheated_space = "to unheated space" in description_lower
-        to_external_air = "to external air" in description_lower
-        is_suspended = "suspended" in description_lower
-        is_solid = "solid" in description_lower
-        thermal_transmittence, thermal_transmittence_unit, insulation_thickness = None, None, None
-        is_valid = "invalid" not in description_lower
+        assumed: bool = "assumed" in description_lower
+        to_unheated_space: bool = "to unheated space" in description_lower
+        to_external_air: bool = "to external air" in description_lower
+        is_suspended: bool = "suspended" in description_lower
+        is_solid: bool = "solid" in description_lower
+        thermal_transmittence: Optional[float] = None
+        thermal_transmittence_unit: Optional[str] = None
+        insulation_thickness: Optional[str] = None
+        is_valid: bool = "invalid" not in description_lower
 
         if "another dwelling below" in description_lower or "other premises below" in description_lower:
             return self._make_clean_output(
@@ -58,8 +66,24 @@ class CleanFloor:
         )
 
     @classmethod
-    def _find_insulation_thickness(cls, description_lower, to_unheated_space, to_external_air, is_suspended, is_solid):
+    def _find_insulation_thickness(
+        cls,
+        description_lower: str,
+        to_unheated_space: bool,
+        to_external_air: bool,
+        is_suspended: bool,
+        is_solid: bool
+    ) -> str:
+        """
+        Method to find the insulation thickness from the description.
 
+        :param description_lower: Description of the floor in lower case.
+        :param to_unheated_space: Boolean indicating if there's an unheated space below.
+        :param to_external_air: Boolean indicating if the floor is exposed to external air.
+        :param is_suspended: Boolean indicating if the floor is suspended.
+        :param is_solid: Boolean indicating if the floor is solid.
+        :return: Insulation thickness as a string.
+        """
         if to_unheated_space | to_external_air | is_suspended | is_solid:
             if to_unheated_space:
                 split_on = "to unheated space,"
@@ -78,30 +102,31 @@ class CleanFloor:
 
     @staticmethod
     def _make_clean_output(
-        is_valid,
-        has_dwelling_below,
-        thermal_transmittence,
-        thermal_transmittence_unit,
-        to_unheated_space,
-        to_external_air,
-        is_suspended,
-        is_solid,
-        assumed,
-        insulation_thickness
+        is_valid: bool,
+        has_dwelling_below: bool,
+        thermal_transmittence: Optional[float],
+        thermal_transmittence_unit: Optional[str],
+        to_unheated_space: bool,
+        to_external_air: bool,
+        is_suspended: bool,
+        is_solid: bool,
+        assumed: bool,
+        insulation_thickness: Optional[str]
     ) -> Dict[str, Union[str, bool, int, None]]:
         """
+        Creates a dictionary with the cleaned data.
 
-        :param is_valid:
-        :param has_dwelling_below:
-        :param thermal_transmittence:
-        :param thermal_transmittence_unit:
-        :param to_unheated_space:
-        :param to_external_air:
-        :param is_suspended:
-        :param is_solid:
-        :param assumed:
-        :param insulation_thickness:
-        :return:
+        :param is_valid: Boolean indicating if the description is valid.
+        :param has_dwelling_below: Boolean indicating if there's a dwelling below.
+        :param thermal_transmittence: Thermal transmittence value.
+        :param thermal_transmittence_unit: Unit of thermal transmittence.
+        :param to_unheated_space: Boolean indicating if there's an unheated space below.
+        :param to_external_air: Boolean indicating if the floor is exposed to external air.
+        :param is_suspended: Boolean indicating if the floor is suspended.
+        :param is_solid: Boolean indicating if the floor is solid.
+        :param assumed: Boolean indicating if the data was assumed.
+        :param insulation_thickness: Insulation thickness as a string.
+        :return: Dictionary with cleaned data.
         """
         return {
             "is_valid": is_valid,