diff --git a/src/bonsai/bonsai/tool/cad.py b/src/bonsai/bonsai/tool/cad.py
index 8b2b34dae2..62c2b854ab 100644
--- a/src/bonsai/bonsai/tool/cad.py
+++ b/src/bonsai/bonsai/tool/cad.py
@@ -36,7 +36,7 @@ import bmesh
 import mathutils.geometry
 from mathutils import Vector, Matrix, geometry
 import itertools
-from typing import TYPE_CHECKING
+from typing import TYPE_CHECKING, Union
 
 if TYPE_CHECKING:
     from bonsai.bim.module.cad.prop import BIMCadProperties
@@ -170,7 +170,9 @@ class Cad:
         return geometry.intersect_line_plane(v1, v2, plane_co, plane_no)
 
     @classmethod
-    def intersect_edges(cls, edge1, edge2):
+    def intersect_edges(
+        cls, edge1: tuple[Vector, Vector], edge2: tuple[Vector, Vector]
+    ) -> Union[tuple[Vector, Vector], None]:
         """
         > takes 2 tuples, each tuple contains 2 vectors
         - prepares input for sending to intersect_line_line
diff --git a/src/ifcsverchok/helper.py b/src/ifcsverchok/helper.py
index edcd723836..61b2b5de45 100644
--- a/src/ifcsverchok/helper.py
+++ b/src/ifcsverchok/helper.py
@@ -17,13 +17,17 @@
 # along with IfcSverchok.  If not, see <http://www.gnu.org/licenses/>.
 
 import bpy
+import ifcopenshell
 from sverchok.data_structure import zip_long_repeat
+from typing import Any
 
-ifc_files = {}
+ifc_files: dict[str, ifcopenshell.file] = {}
 
 
 class SvIfcCore:
-    def process(self):
+    sv_input_names: list[str]
+
+    def process(self) -> None:
         sv_inputs_nested = []
         for name in self.sv_input_names:
             sv_inputs_nested.append(self.inputs[name].sv_get())
@@ -31,3 +35,6 @@ class SvIfcCore:
             for sv_input in zip_long_repeat(*sv_input_nested):
                 sv_input = list(sv_input)
                 self.process_ifc(*sv_input)
+
+    def process_ifc(self, *args: Any, **kwargs: Any) -> None:
+        raise NotImplementedError
diff --git a/src/ifcsverchok/nodes/ifc/create_entity.py b/src/ifcsverchok/nodes/ifc/create_entity.py
index f17b02a3c0..463154486c 100644
--- a/src/ifcsverchok/nodes/ifc/create_entity.py
+++ b/src/ifcsverchok/nodes/ifc/create_entity.py
@@ -19,6 +19,7 @@
 import bpy
 from mathutils import Matrix
 import ifcopenshell
+import ifcopenshell.api
 import ifcsverchok.helper
 from ifcsverchok.ifcstore import SvIfcStore
 
diff --git a/src/ifcsverchok/nodes/ifc/create_file.py b/src/ifcsverchok/nodes/ifc/create_file.py
index f57c9825ed..85794206bf 100644
--- a/src/ifcsverchok/nodes/ifc/create_file.py
+++ b/src/ifcsverchok/nodes/ifc/create_file.py
@@ -34,6 +34,7 @@ class SvIfcCreateFileRefresh(bpy.types.Operator):
     has_baked: bpy.props.BoolProperty(name="Has Baked", default=False)
 
     def execute(self, context):
+        node: SvIfcCreateFile
         node = bpy.data.node_groups[self.tree_name].nodes[self.node_name]
         node.process()
         return {"FINISHED"}
@@ -55,7 +56,7 @@ class SvIfcCreateFile(bpy.types.Node, SverchCustomTreeNode, ifcsverchok.helper.S
         self.sv_input_names = ["schema"]
         super().process()
 
-    def process_ifc(self, schema):
+    def process_ifc(self, schema: str) -> None:
         guid = ifcopenshell.guid.new()
         ifcsverchok.helper.ifc_files[guid] = ifcopenshell.file(schema=schema)
         self.outputs["file"].sv_set([[ifcsverchok.helper.ifc_files[guid]]])
diff --git a/src/ifcsverchok/nodes/ifc/create_project.py b/src/ifcsverchok/nodes/ifc/create_project.py
index 3048f7f936..b8f6b3177f 100644
--- a/src/ifcsverchok/nodes/ifc/create_project.py
+++ b/src/ifcsverchok/nodes/ifc/create_project.py
@@ -52,7 +52,7 @@ class SvIfcCreateProject(bpy.types.Node, SverchCustomTreeNode, ifcsverchok.helpe
         project_name = self.inputs["project_name"].sv_get()[0][0]
         self.process_ifc(file, project_name)
 
-    def process_ifc(self, file, project_name):
+    def process_ifc(self, file: ifcopenshell.file, project_name: str) -> None:
         # create project
         project = ifcopenshell.api.run("root.create_entity", file, ifc_class="IfcProject", name=str(project_name))
         lengthunit = ifcopenshell.api.run("unit.add_si_unit", file, unit_type="LENGTHUNIT")