diff --git a/DDG4/python/DDSim/DD4hepSimulation.py b/DDG4/python/DDSim/DD4hepSimulation.py
index da83bd6a847c7aa83b6226492dc964595b9bd75c..193688d12f91de3ce0828ff314c22690d0053376 100644
--- a/DDG4/python/DDSim/DD4hepSimulation.py
+++ b/DDG4/python/DDSim/DD4hepSimulation.py
@@ -17,6 +17,7 @@ from DDSim.Helper.HepMC3 import HepMC3
 from DDSim.Helper.GuineaPig import GuineaPig
 from DDSim.Helper.Physics import Physics
 from DDSim.Helper.Filter import Filter
+from DDSim.Helper.Geometry import Geometry
 from DDSim.Helper.Random import Random
 from DDSim.Helper.Action import Action
 from DDSim.Helper.Output import Output, outputLevel, outputLevelType
@@ -85,6 +86,7 @@ class DD4hepSimulation(object):
     self.hepmc3 = HepMC3()
     self.meta = Meta()
 
+    self.geometry = Geometry()
     self.filter = Filter()
     self.physics = Physics()
 
@@ -324,8 +326,10 @@ class DD4hepSimulation(object):
     # setup the magnetic field:
     self.__setMagneticFieldOptions(simple)
 
-    # ----------------------------------------------------------------------------------
+    # configure geometry creation
+    self.geometry.constructGeometry(kernel, geant4)
 
+    # ----------------------------------------------------------------------------------
     # Configure Run actions
     run1 = DDG4.RunAction(kernel, 'Geant4TestRunAction/RunInit')
     kernel.registerGlobalAction(run1)
diff --git a/DDG4/python/DDSim/Helper/Geometry.py b/DDG4/python/DDSim/Helper/Geometry.py
new file mode 100644
index 0000000000000000000000000000000000000000..608c98f02ef67db062925d85779a1bd3b89c24e6
--- /dev/null
+++ b/DDG4/python/DDSim/Helper/Geometry.py
@@ -0,0 +1,65 @@
+"""Helper object for Geant4 Geometry conversion."""
+
+from __future__ import absolute_import, unicode_literals
+
+from DDSim.Helper.ConfigHelper import ConfigHelper
+
+
+class Geometry(ConfigHelper):
+  """Configuration for the Detector Construction."""
+
+  def __init__(self):
+    super(Geometry, self).__init__()
+
+    self._enableDebugMaterials_EXTRA = {"help": "Print Debug information about Materials"}
+    self.enableDebugMaterials = False
+    self._enableDebugElements_EXTRA = {"help": "Print Debug information about Elements"}
+    self.enableDebugElements = False
+    self._enableDebugVolumes_EXTRA = {"help": "Print Debug information about Volumes"}
+    self.enableDebugVolumes = False
+    self._enableDebugShapes_EXTRA = {"help": "Print Debug information about Shapes"}
+    self.enableDebugShapes = False
+    self._enableDebugPlacements_EXTRA = {"help": "Print Debug information about Placements"}
+    self.enableDebugPlacements = False
+    self._enableDebugReflections_EXTRA = {"help": "Print Debug information about Reflections"}
+    self.enableDebugReflections = False
+    self._enableDebugRegions_EXTRA = {"help": "Print Debug information about Regions"}
+    self.enableDebugRegions = False
+    self._enableDebugSurfaces_EXTRA = {"help": "Print Debug information about Surfaces"}
+    self.enableDebugSurfaces = False
+    self._dumpHierachy_EXTRA = {"help": "If larger than 0, the depth up to which detector hierarchy is dumped"}
+    self.dumpHierarchy = 0
+
+    # unused
+    self.printPlacements = False
+    self.printSensitives = False
+    # FIXME: get this via output.geoInfoPrintLevel!!!
+    self.geoInfoPrintLevel = 7
+
+    self._dumpDGDML_EXTRA = {"help": "If not empty, filename to dump the Geometry as GDML"}
+    self.dumpGDML = ""
+
+  def constructGeometry(self, kernel, geant4, numberOfThreads=1):
+    """Construct Geant4 geometry."""
+    from DDG4 import DetectorConstruction
+
+    seq, act = geant4.addDetectorConstruction('Geant4DetectorGeometryConstruction/ConstructGeo')
+    act.DebugMaterials = self.enableDebugMaterials
+    act.DebugElements = self.enableDebugElements
+    act.DebugVolumes = self.enableDebugVolumes
+    act.DebugShapes = self.enableDebugShapes
+    act.DebugPlacements = self.enableDebugPlacements
+    act.DebugReflections = self.enableDebugReflections
+    act.DebugRegions = self.enableDebugRegions
+    act.DebugSurfaces = self.enableDebugSurfaces
+    act.PrintPlacements = self.printPlacements
+    act.PrintSensitives = self.printSensitives
+    act.GeoInfoPrintLevel = self.geoInfoPrintLevel
+    act.DumpHierarchy = self.dumpHierarchy
+    act.DumpGDML = self.dumpGDML
+
+
+    # Apply sensitive detectors
+    sensitives = DetectorConstruction(kernel, str('Geant4DetectorSensitivesConstruction/ConstructSD'))
+    sensitives.enableUI()
+    seq.adopt(sensitives)