diff --git a/properties/__init__.py b/properties/__init__.py
new file mode 100644
index 00000000..c6b0a577
--- /dev/null
+++ b/properties/__init__.py
@@ -0,0 +1,32 @@
+#
+# Copyright The NOMAD Authors.
+#
+# This file is part of NOMAD.
+# See https://nomad-lab.eu for further info.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+from .energies import FermiLevel, ChemicalPotential
+from .band_gap import ElectronicBandGap
+from .spectral_profile import (
+    SpectralProfile,
+    DOSProfile,
+    ElectronicDensityOfStates,
+    AbsorptionSpectrum,
+    XASSpectrum,
+)
+from .hopping_matrix import HoppingMatrix, CrystalFieldSplitting
+from .permittivity import Permittivity
+from .fermi_surface import FermiSurface
+from .band_structure import ElectronicEigenvalues, ElectronicBandStructure
+
diff --git a/energies.py b/properties/energies.py
similarity index 100%
rename from energies.py
rename to properties/energies.py
diff --git a/forces.py b/properties/forces.py
similarity index 100%
rename from forces.py
rename to properties/forces.py
diff --git a/thermodynamics.py b/properties/thermodynamics.py
similarity index 100%
rename from thermodynamics.py
rename to properties/thermodynamics.py