diff --git a/cppython/project.py b/cppython/project.py
index 72411c6..b4bba63 100644
--- a/cppython/project.py
+++ b/cppython/project.py
@@ -22,7 +22,7 @@
 from pydantic import create_model
 
 from cppython.schema import API, CMakePresets, ConfigurePreset, ProjectConfiguration
-from cppython.utility import read_model_json, write_model_json
+from cppython.utility import read_json, read_model_json, write_json, write_model_json
 
 
 class ProjectBuilder:
@@ -161,13 +161,18 @@ def write_generator_presets(path: Path, generator_name: str, toolchain_path: Pat
         root_preset_path = self.configuration.root_path / "CMakePresets.json"
 
         if root_preset_path.exists():
-            root_preset = read_model_json(root_preset_path, CMakePresets)
+            root_preset = read_json(root_preset_path)
 
-            for include_path in root_preset.include:
-                if Path(include_path).name == "cppython.json":
-                    include_path = json_path
+            root_model = CMakePresets.parse_obj(root_preset)
 
-            write_model_json(root_preset_path, root_preset)
+            if root_model.include is not None:
+                for include_path in root_model.include:
+                    if Path(include_path).name == "cppython.json":
+                        include_path = json_path
+
+            root_preset.update(root_model.dict())
+
+            write_json(root_preset_path, root_preset)
 
 
 class Project(API):
diff --git a/cppython/utility.py b/cppython/utility.py
index 1df313f..41a72ef 100644
--- a/cppython/utility.py
+++ b/cppython/utility.py
@@ -4,7 +4,7 @@
 
 import json
 from pathlib import Path
-from typing import Type
+from typing import Any, Type
 
 from cppython_core.schema import ModelT
 from pydantic import BaseModel
@@ -12,17 +12,35 @@
 
 def read_model_json(path: Path, model: Type[ModelT]) -> ModelT:
     """
-    Reading routine
+    Reading routine. Only keeps Model data
     """
 
     return model.parse_file(path=path)
 
 
+def read_json(path: Path) -> Any:
+    """
+    Reading routine
+    """
+
+    with open(path, "r", encoding="utf-8") as file:
+        return json.load(file)
+
+
 def write_model_json(path: Path, model: BaseModel) -> None:
     """
-    Writing routine
+    Writing routine. Only writes model data
     """
 
     serialized = json.loads(model.json(exclude_none=True))
-    with open(path, "w", encoding="utf8") as json_file:
-        json.dump(serialized, json_file, ensure_ascii=False, indent=2)
+    with open(path, "w", encoding="utf8") as file:
+        json.dump(serialized, file, ensure_ascii=False, indent=4)
+
+
+def write_json(path: Path, data: Any) -> None:
+    """
+    Writing routine
+    """
+
+    with open(path, "w", encoding="utf-8") as file:
+        json.dump(data, file, ensure_ascii=False, indent=4)
diff --git a/data.json b/data.json
new file mode 100644
index 0000000..e69de29
diff --git a/tests/unit/test_utility.py b/tests/unit/test_utility.py
index b113e84..d873f7e 100644
--- a/tests/unit/test_utility.py
+++ b/tests/unit/test_utility.py
@@ -13,26 +13,26 @@ class TestBuilder:
     TODO
     """
 
-    def test_model_read_write(self, tmpdir):
+    class TestModel(BaseModel):
         """
         TODO
         """
 
-        class TestModel(BaseModel):
-            """
-            TODO
-            """
+        test_path: Path
+        test_int: int
 
-            test_path: Path
-            test_int: int
+    def test_model_read_write(self, tmpdir):
+        """
+        TODO
+        """
 
-        test_model = TestModel(test_path=Path(), test_int=3)
+        test_model = TestBuilder.TestModel(test_path=Path(), test_int=3)
 
         temporary_directory = Path(tmpdir)
 
         json_path = temporary_directory / "test.json"
 
         write_model_json(json_path, test_model)
-        output = read_model_json(json_path, TestModel)
+        output = read_model_json(json_path, TestBuilder.TestModel)
 
         assert test_model == output