diff --git a/SimG4CMS/Calo/interface/HGCSD.h b/SimG4CMS/Calo/interface/HGCSD.h
index b490891db1d89..609fa316407c8 100644
--- a/SimG4CMS/Calo/interface/HGCSD.h
+++ b/SimG4CMS/Calo/interface/HGCSD.h
@@ -54,6 +54,7 @@ class HGCSD : public CaloSD, public Observer<const BeginOfJob *> {
   int levelT_;
   bool storeAllG4Hits_, rejectMB_, waferRot_;
   double mouseBiteCut_;
+  bool dd4hep_;
   std::vector<double> angles_;
 
   TTree *tree_;
diff --git a/SimG4CMS/Calo/interface/HGCalSD.h b/SimG4CMS/Calo/interface/HGCalSD.h
index 28389d8e40368..e3fe8ffa9918f 100644
--- a/SimG4CMS/Calo/interface/HGCalSD.h
+++ b/SimG4CMS/Calo/interface/HGCalSD.h
@@ -54,6 +54,7 @@ class HGCalSD : public CaloSD, public Observer<const BeginOfJob *> {
   bool storeAllG4Hits_;
   bool fiducialCut_, rejectMB_, waferRot_, checkID_;
   int useSimWt_, verbose_;
+  bool dd4hep_;
   const double tan30deg_, cos30deg_;
   std::vector<double> angles_;
   std::string missingFile_;
diff --git a/SimG4CMS/Calo/src/HGCSD.cc b/SimG4CMS/Calo/src/HGCSD.cc
index c3450afb97ce0..561adde390b25 100644
--- a/SimG4CMS/Calo/src/HGCSD.cc
+++ b/SimG4CMS/Calo/src/HGCSD.cc
@@ -56,6 +56,7 @@ HGCSD::HGCSD(const std::string& name,
   double waferSize = m_HGC.getUntrackedParameter<double>("WaferSize") * CLHEP::mm;
   double mouseBite = m_HGC.getUntrackedParameter<double>("MouseBite") * CLHEP::mm;
   mouseBiteCut_ = waferSize * tan(30.0 * CLHEP::deg) - mouseBite;
+  dd4hep_ = p.getParameter<bool>("g4GeometryDD4hepSource");
 
   if (storeAllG4Hits_) {
     setUseMap(false);
@@ -206,6 +207,8 @@ void HGCSD::update(const BeginOfJob* job) {
     geom_mode_ = hgcons_->geomMode();
     slopeMin_ = hgcons_->minSlope();
     levelT_ = hgcons_->levelTop();
+    if (dd4hep_)
+      ++levelT_;
     numberingScheme_ = std::make_unique<HGCNumberingScheme>(*hgcons_, nameX_);
     if (rejectMB_)
       mouseBite_ = std::make_unique<HGCMouseBite>(*hgcons_, angles_, mouseBiteCut_, waferRot_);
@@ -215,7 +218,7 @@ void HGCSD::update(const BeginOfJob* job) {
   }
 #ifdef EDM_ML_DEBUG
   edm::LogVerbatim("HGCSim") << "HGCSD::Initialized with mode " << geom_mode_ << " Slope cut " << slopeMin_
-                             << " top Level " << levelT_;
+                             << " top Level " << levelT_ << " dd4hep " << dd4hep_;
 #endif
 }
 
diff --git a/SimG4CMS/Calo/src/HGCalSD.cc b/SimG4CMS/Calo/src/HGCalSD.cc
index cf9bb067f4a86..441b72ba9e261 100644
--- a/SimG4CMS/Calo/src/HGCalSD.cc
+++ b/SimG4CMS/Calo/src/HGCalSD.cc
@@ -62,6 +62,7 @@ HGCalSD::HGCalSD(const std::string& name,
   missingFile_ = m_HGC.getUntrackedParameter<std::string>("MissingWaferFile");
   checkID_ = m_HGC.getUntrackedParameter<bool>("CheckID");
   verbose_ = m_HGC.getUntrackedParameter<int>("Verbosity");
+  dd4hep_ = p.getParameter<bool>("g4GeometryDD4hepSource");
 
   if (storeAllG4Hits_) {
     setUseMap(false);
@@ -247,6 +248,10 @@ void HGCalSD::update(const BeginOfJob* job) {
     slopeMin_ = hgcons_->minSlope();
     levelT1_ = hgcons_->levelTop(0);
     levelT2_ = hgcons_->levelTop(1);
+    if (dd4hep_) {
+      ++levelT1_;
+      ++levelT2_;
+    }
     useSimWt_ = hgcons_->getParameter()->useSimWt_;
     int useOffset = hgcons_->getParameter()->useOffset_;
     double waferSize = hgcons_->waferSize(false);
@@ -263,7 +268,8 @@ void HGCalSD::update(const BeginOfJob* job) {
     edm::LogVerbatim("HGCSim") << "HGCalSD::Initialized with mode " << geom_mode_ << " Slope cut " << slopeMin_
                                << " top Level " << levelT1_ << ":" << levelT2_ << " useSimWt " << useSimWt_ << " wafer "
                                << waferSize << ":" << mouseBite << ":" << guardRingOffset << ":" << sensorSizeOffset
-                               << ":" << mouseBiteNew << ":" << mouseBiteCut_ << " useOffset " << useOffset;
+                               << ":" << mouseBiteNew << ":" << mouseBiteCut_ << " useOffset " << useOffset
+                               << " dd4hep " << dd4hep_;
 #endif
 
     numberingScheme_ = std::make_unique<HGCalNumberingScheme>(*hgcons_, mydet_, nameX_, missingFile_);
diff --git a/SimG4CMS/Calo/test/python/Sim2026_cfg.py b/SimG4CMS/Calo/test/python/Sim2026_cfg.py
index 7e0a60e0da18f..a4d4b07caa220 100644
--- a/SimG4CMS/Calo/test/python/Sim2026_cfg.py
+++ b/SimG4CMS/Calo/test/python/Sim2026_cfg.py
@@ -112,6 +112,7 @@
 process.analysis_step3 = cms.EndPath(process.hgcalHitCheckHEB)
 
 process.g4SimHits.Physics.type = 'SimG4Core/Physics/FTFP_BERT_EMM'
+process.g4SimHits.HGCSD.Verbosity = 0
 
 # Schedule definition
 process.schedule = cms.Schedule(process.simulation_step,