diff --git a/src/bonsai/bonsai/bim/data/pset/Psets_BBIM_Annotation.ifc b/src/bonsai/bonsai/bim/data/pset/Psets_BBIM_Annotation.ifc
index 37278587a9..dd4851f9c5 100644
--- a/src/bonsai/bonsai/bim/data/pset/Psets_BBIM_Annotation.ifc
+++ b/src/bonsai/bonsai/bim/data/pset/Psets_BBIM_Annotation.ifc
@@ -28,11 +28,13 @@ DATA;
 #21=IFCSIMPLEPROPERTYTEMPLATE('1UDakJ5_f7kBhggNSW4$h5',$,'SymbolsPath','Default symbols SVG',.P_SINGLEVALUE.,'IfcLabel',$,$,$,$,$,.READWRITE.);
 #22=IFCSIMPLEPROPERTYTEMPLATE('0d53LEtgLDQxnv__NfgH7i',$,'PatternsPath','Default patterns SVG',.P_SINGLEVALUE.,'IfcLabel',$,$,$,$,$,.READWRITE.);
 #23=IFCSIMPLEPROPERTYTEMPLATE('26qFNMv7nCHgU6Jd7Anga5',$,'ShadingStylesPath','Default shading styles',.P_SINGLEVALUE.,'IfcLabel',$,$,$,$,$,.READWRITE.);
-#24=IFCPROPERTYSETTEMPLATE('0I9merLinF5Ap$aZwaclgm',$,'BBIM_Dimension','',.PSET_TYPEDRIVENOVERRIDE.,'IfcAnnotation/DIMENSION,IfcTypeProduct',(#25,#26,#27,#28));
+#24=IFCPROPERTYSETTEMPLATE('0I9merLinF5Ap$aZwaclgm',$,'BBIM_Dimension','',.PSET_TYPEDRIVENOVERRIDE.,'IfcAnnotation/DIMENSION,IfcAnnotation/RADIUS,IfcAnnotation/DIAMETER,IfcTypeProduct',(#25,#26,#27,#28,#30));
 #25=IFCSIMPLEPROPERTYTEMPLATE('1rL2AbQsXD8RbpoWH5pYOV',$,'ShowDescriptionOnly','Hide the measurement values and show only annotation description',.P_SINGLEVALUE.,'IfcBoolean',$,$,$,$,$,.READWRITE.);
 #26=IFCSIMPLEPROPERTYTEMPLATE('0SVyOfB0rC2xNfdRYf3XvY',$,'SuppressZeroInches','Suppress 0 inch values in dimension annotation text (for example: 12'' - 0" -> 12'')',.P_SINGLEVALUE.,'IfcBoolean',$,$,$,$,$,.READWRITE.);
 #27=IFCSIMPLEPROPERTYTEMPLATE('2bUmj458PBqPAtUoI3MXsb',$,'TextPrefix','Text to add before annotation measurement value',.P_SINGLEVALUE.,'IfcLabel',$,$,$,$,$,.READWRITE.);
 #28=IFCSIMPLEPROPERTYTEMPLATE('0bnzttUb9BPuN597uNTXOE',$,'TextSuffix','Text to add after annotation measurement value',.P_SINGLEVALUE.,'IfcLabel',$,$,$,$,$,.READWRITE.);
 #29=IFCSIMPLEPROPERTYTEMPLATE('2pJmUDpB50VBdCOib1zcJJ',$,'Newline_At','',.P_SINGLEVALUE.,'IfcInteger',$,$,$,$,$,.READWRITE.);
+#30=IFCSIMPLEPROPERTYTEMPLATE('2TJn72t_v2cvBUG916Dpev',$,'CustomUnit','Dimension''s custom unit',.P_ENUMERATEDVALUE.,'IfcText',$,#31,$,$,$,.READWRITE.);
+#31=IFCPROPERTYENUMERATION('CustomUnit',(IFCTEXT('Feet and Inches - Fractional'),IFCTEXT('Feet - Decimal'),IFCTEXT('Inches - Fractional'),IFCTEXT('Inches - Decimal'),IFCTEXT('Meters'),IFCTEXT('Decimeters'),IFCTEXT('Centimeters'),IFCTEXT('Millimeters')),$);
 ENDSEC;
 END-ISO-10303-21;
diff --git a/src/bonsai/bonsai/bim/module/drawing/data.py b/src/bonsai/bonsai/bim/module/drawing/data.py
index 30fda54828..579677cb98 100644
--- a/src/bonsai/bonsai/bim/module/drawing/data.py
+++ b/src/bonsai/bonsai/bim/module/drawing/data.py
@@ -386,6 +386,8 @@ class DecoratorData:
         suppress_zero_inches = pset_data.get("SuppressZeroInches", False)
         text_prefix = pset_data.get("TextPrefix", None) or ""
         text_suffix = pset_data.get("TextSuffix", None) or ""
+        custom_unit_list = pset_data.get("CustomUnit", None) or ""
+        custom_unit = custom_unit_list[0] if custom_unit_list else ""
 
         dimension_data = {
             "dimension_style": dimension_style,
@@ -394,6 +396,7 @@ class DecoratorData:
             "text_prefix": text_prefix,
             "text_suffix": text_suffix,
             "fill_bg": fill_bg,
+            "custom_unit": custom_unit,
         }
         cls.data[obj.name] = dimension_data
         return dimension_data
diff --git a/src/bonsai/bonsai/bim/module/drawing/decoration.py b/src/bonsai/bonsai/bim/module/drawing/decoration.py
index 9c26c2b1c5..df68e7e8cd 100644
--- a/src/bonsai/bonsai/bim/module/drawing/decoration.py
+++ b/src/bonsai/bonsai/bim/module/drawing/decoration.py
@@ -495,14 +495,14 @@ class BaseDecorator:
         self.draw_label(context, text=text, line_no=line_number_start, multiline=True, **draw_label_kwargs)
 
     @lru_cache(maxsize=None)
-    def format_value(self, context, value):
+    def format_value(self, context, value, custom_unit=None):
         drawing_pset_data = DrawingsData.data["active_drawing_pset_data"]
         precision = drawing_pset_data.get("MetricPrecision", None)
         if not precision:
             precision = drawing_pset_data.get("ImperialPrecision", None)
 
         decimal_places = drawing_pset_data.get("DecimalPlaces", None)
-        return format_distance(value, precision=precision, decimal_places=decimal_places)
+        return format_distance(value, precision=precision, decimal_places=decimal_places, suppress_zero_inches=True, custom_unit=custom_unit)
 
     def draw_asterisk(self, context: bpy.types.Context, pos: Vector, rotation: float = 0.0, scale: float = 1.0) -> None:
         """`pos` is a world space position\n
@@ -737,7 +737,7 @@ class DimensionDecorator(BaseDecorator):
 
             if not show_description_only:
                 length = (v1 - v0).length
-                text = self.format_value(context, length)
+                text = self.format_value(context, length, custom_unit=dimension_data["custom_unit"])
                 if isinstance(self, DiameterDecorator):
                     text = "D" + text
                 text = text_prefix + text + text_suffix
@@ -946,7 +946,7 @@ class RadiusDecorator(BaseDecorator):
 
         def get_text():
             length = (spline_points[-1] - spline_points[-2]).length
-            return "R" + self.format_value(context, length)
+            return "R" + self.format_value(context, length, custom_unit=dimension_data["custom_unit"])
 
         self.draw_dimension_text(
             context, get_text, description, dimension_data, pos=pos, text_dir=Vector((1, 0)), box_alignment="center"
diff --git a/src/bonsai/bonsai/bim/module/drawing/helper.py b/src/bonsai/bonsai/bim/module/drawing/helper.py
index f782cdbb7a..6a53de6c9f 100644
--- a/src/bonsai/bonsai/bim/module/drawing/helper.py
+++ b/src/bonsai/bonsai/bim/module/drawing/helper.py
@@ -130,30 +130,52 @@ def format_distance(
     decimal_places=None,
     suppress_zero_inches=False,
     in_unit_length=False,
+    custom_unit=None,
 ):
     # Get Blender Scene Unit Settings
     unit_scale = bpy.context.scene.unit_settings.scale_length
     unit_system = bpy.context.scene.unit_settings.system
     unit_length = bpy.context.scene.unit_settings.length_unit
     area_unit_symbol = " m2" if unit_system == "METRIC" else " ft2"
+
     # Get IFC Unit Settings
     if tool.Ifc.get():
+        unit_scale = 1
         if length_unit := ifcopenshell.util.unit.get_project_unit(tool.Ifc.get(), "LENGTHUNIT"):
             unit_system = "METRIC" if length_unit.Name == "METRE" else "IMPERIAL"
             unit_length = length_unit.Name
             if hasattr(length_unit, "Prefix") and length_unit.Prefix:
                 unit_length = length_unit.Prefix + length_unit.Name
-            string_conversion = {
+            unit_length_mapping = {
                 "foot": "FEET",
                 "inch": "INCHES",
                 "METRE": "METERS",
+                "DECIMETRE": "DECIMETERS",
                 "CENTIMETRE": "CENTIMETERS",
                 "MILLIMETRE": "MILLIMETERS",
             }
-            unit_length = string_conversion[unit_length]
+            unit_length = unit_length_mapping[unit_length]
+        # For now we only format area in IFC Units
         if area_unit := ifcopenshell.util.unit.get_project_unit(tool.Ifc.get(), "AREAUNIT"):
             area_unit_symbol = " " + ifcopenshell.util.unit.get_unit_symbol(area_unit)
 
+    unit_fraction = True if unit_system == "IMPERIAL" else False
+
+    # Custom Unit Settings
+    if custom_unit:
+        unit_mapping = {
+        "Feet and Inches - Fractional": ("IMPERIAL", "FEET", True),
+        "Feet - Decimal": ("IMPERIAL", "FEET", False),
+        "Inches - Fractional": ("IMPERIAL", "INCHES", True),
+        "Inches - Decimal": ("IMPERIAL", "INCHES", False),
+        "Meters": ("METRIC", "METERS", False),
+        "Decimeters": ("METRIC", "DECIMETERS", False),
+        "Centimeters": ("METRIC", "CENTIMETERS", False),
+        "Millimeters": ("METRIC", "MILLIMETERS", False),
+    }
+        if custom_unit in unit_mapping:
+            unit_system, unit_length, unit_fraction = unit_mapping[custom_unit]
+
     value *= unit_scale
 
     # Imperial Formatting
@@ -181,8 +203,11 @@ def format_distance(
         decInches = value * toInches
 
         # Separate ft and inches
-        # Unless Inches are the specified Length Unit
-        if unit_length != "INCHES":
+        # Unless Inches are the specified Length Unit or unit_fraction is False
+        if (unit_length == "FEET" and not unit_fraction):
+            feet = round(decInches / inPerFoot, 3)  # keep decimal
+            decInches = 0
+        elif unit_length != "INCHES":
             feet = int(decInches / inPerFoot)  # remove decimal
             decInches -= feet * inPerFoot
         else:
@@ -217,6 +242,10 @@ def format_distance(
                 feet += 1
                 inches = 0
 
+        # Check whether decimal or fractional
+        if not unit_fraction:
+            inches = round(decInches, 3)
+            frac = None
         if not isArea:
             add_inches = bool(inches) or not suppress_zero_inches or (inches == 0 and frac)
             tx_dist = ""
@@ -265,6 +294,8 @@ def format_distance(
     # METRIC FORMATTING
     elif unit_system == "METRIC":
         if in_unit_length:
+            if unit_length == "DECIMETERS":
+                value = value / 10
             if unit_length == "CENTIMETERS":
                 value = value / 100
             if unit_length == "MILLIMETERS":
@@ -283,6 +314,14 @@ def format_distance(
             if hide_units is False:
                 fmt += " m"
             tx_dist = fmt % value
+        # Decimeters
+        elif unit_length == "DECIMETERS":
+            if decimal_places is None:
+                fmt = "%1.1f"
+            if hide_units is False:
+                fmt += " dm"
+            d_dm = value * (10)
+            tx_dist = fmt % d_dm
         # Centimeters
         elif unit_length == "CENTIMETERS":
             if decimal_places is None:
diff --git a/src/bonsai/bonsai/bim/module/drawing/svgwriter.py b/src/bonsai/bonsai/bim/module/drawing/svgwriter.py
index 9a249450f7..ba9f69664e 100644
--- a/src/bonsai/bonsai/bim/module/drawing/svgwriter.py
+++ b/src/bonsai/bonsai/bim/module/drawing/svgwriter.py
@@ -1128,7 +1128,7 @@ class SvgWriter:
 
             def get_text():
                 radius = (points[-1].co - points[-2].co).length
-                radius = helper.format_distance(radius, precision=self.precision, decimal_places=self.decimal_places)
+                radius = helper.format_distance(radius, precision=self.precision, decimal_places=self.decimal_places, custom_unit=dimension_data["custom_unit"])
                 text = f"R{radius}"
                 return text
 
@@ -1256,6 +1256,7 @@ class SvgWriter:
                     text_prefix=dimension_data["text_prefix"],
                     text_suffix=dimension_data["text_suffix"],
                     fill_bg=dimension_data["fill_bg"],
+                    custom_unit=dimension_data["custom_unit"]
                 )
 
     def draw_dimension_annotations(self, obj):
@@ -1280,6 +1281,7 @@ class SvgWriter:
                     text_prefix=dimension_data["text_prefix"],
                     text_suffix=dimension_data["text_suffix"],
                     fill_bg=dimension_data["fill_bg"],
+                    custom_unit=dimension_data["custom_unit"],
                 )
 
     def draw_measureit_arch_dimension_annotations(self):
@@ -1306,6 +1308,7 @@ class SvgWriter:
         text_prefix="",
         text_suffix="",
         fill_bg=False,
+        custom_unit=None,
     ):
         offset = Vector([self.raw_width, self.raw_height]) / 2
         v0 = self.project_point_onto_camera(v0_global)
@@ -1339,6 +1342,7 @@ class SvgWriter:
                 precision=self.precision,
                 decimal_places=self.decimal_places,
                 suppress_zero_inches=suppress_zero_inches,
+                custom_unit=custom_unit,
             )
             text = text_prefix + str(dimension) + text_suffix
         else: