diff --git a/src/rsz/include/rsz/Resizer.hh b/src/rsz/include/rsz/Resizer.hh
index c0dba8182f9..2e1285d796f 100644
--- a/src/rsz/include/rsz/Resizer.hh
+++ b/src/rsz/include/rsz/Resizer.hh
@@ -152,7 +152,8 @@ enum class ParasiticsSrc
 {
   none,
   placement,
-  global_routing
+  global_routing,
+  detailed_routing
 };
 
 struct ParasiticsResistance
@@ -413,6 +414,7 @@ class Resizer : public dbStaState
 
   dbNetwork* getDbNetwork() { return db_network_; }
   ParasiticsSrc getParasiticsSrc() { return parasitics_src_; }
+  void setParasiticsSrc(ParasiticsSrc src) { parasitics_src_ = src; }
   dbBlock* getDbBlock() { return block_; };
   double dbuToMeters(int dist) const;
   int metersToDbu(double dist) const;
diff --git a/src/rsz/src/BufferedNet.cc b/src/rsz/src/BufferedNet.cc
index db68d439d4c..31f3761b447 100644
--- a/src/rsz/src/BufferedNet.cc
+++ b/src/rsz/src/BufferedNet.cc
@@ -375,6 +375,7 @@ BufferedNetPtr Resizer::makeBufferedNet(const Pin* drvr_pin,
     case ParasiticsSrc::placement:
       return makeBufferedNetSteiner(drvr_pin, corner);
     case ParasiticsSrc::global_routing:
+    case ParasiticsSrc::detailed_routing:
       return makeBufferedNetGroute(drvr_pin, corner);
     case ParasiticsSrc::none:
       return nullptr;
diff --git a/src/rsz/src/EstimateWireParasitics.cc b/src/rsz/src/EstimateWireParasitics.cc
index 94754f98219..872ac6cebdf 100644
--- a/src/rsz/src/EstimateWireParasitics.cc
+++ b/src/rsz/src/EstimateWireParasitics.cc
@@ -294,6 +294,10 @@ void Resizer::estimateParasitics(ParasiticsSrc src,
       global_router_->estimateRC(spef_writer.get());
       parasitics_src_ = ParasiticsSrc::global_routing;
       break;
+    case ParasiticsSrc::detailed_routing:
+      // TODO: call rcx to extract parasitics and load them to STA
+      parasitics_src_ = ParasiticsSrc::detailed_routing;
+      break;
     case ParasiticsSrc::none:
       break;
   }
@@ -310,6 +314,8 @@ void Resizer::incrementalParasiticsBegin()
     case ParasiticsSrc::placement:
       break;
     case ParasiticsSrc::global_routing:
+    case ParasiticsSrc::detailed_routing:
+      // TODO: add IncrementalDRoute
       incr_groute_ = new IncrementalGRoute(global_router_, block_);
       // Don't print verbose messages for incremental routing
       global_router_->setVerbose(false);
@@ -326,6 +332,8 @@ void Resizer::incrementalParasiticsEnd()
     case ParasiticsSrc::placement:
       break;
     case ParasiticsSrc::global_routing:
+    case ParasiticsSrc::detailed_routing:
+      // TODO: add IncrementalDRoute
       delete incr_groute_;
       incr_groute_ = nullptr;
       break;
@@ -344,7 +352,9 @@ void Resizer::updateParasitics(bool save_guides)
       }
       parasitics_invalid_.clear();
       break;
-    case ParasiticsSrc::global_routing: {
+    case ParasiticsSrc::global_routing:
+    case ParasiticsSrc::detailed_routing: {
+      // TODO: update detailed route for modified nets
       incr_groute_->updateRoutes(save_guides);
       for (const Net* net : parasitics_invalid_) {
         global_router_->estimateRC(db_network_->staToDb(net));
@@ -391,6 +401,9 @@ void Resizer::ensureWireParasitic(const Pin* drvr_pin, const Net* net)
         parasitics_invalid_.erase(net);
         break;
       }
+      case ParasiticsSrc::detailed_routing:
+        // TODO: call incremental drt for the modified net
+        break;
       case ParasiticsSrc::none:
         break;
     }
diff --git a/src/rsz/src/Resizer.cc b/src/rsz/src/Resizer.cc
index 9f4668116ce..3267004e456 100644
--- a/src/rsz/src/Resizer.cc
+++ b/src/rsz/src/Resizer.cc
@@ -1276,7 +1276,8 @@ bool Resizer::replaceCell(Instance* inst,
     designAreaIncr(area(replacement_master));
 
     // Legalize the position of the instance in case it leaves the die
-    if (parasitics_src_ == ParasiticsSrc::global_routing) {
+    if (parasitics_src_ == ParasiticsSrc::global_routing
+        || parasitics_src_ == ParasiticsSrc::detailed_routing) {
       opendp_->legalCellPos(db_network_->staToDb(inst));
     }
     if (haveEstimatedParasitics()) {
@@ -2691,7 +2692,8 @@ void Resizer::repairDesign(double max_wire_length,
   utl::SetAndRestore<bool> set_match_footprint(match_cell_footprint_,
                                                match_cell_footprint);
   resizePreamble();
-  if (parasitics_src_ == ParasiticsSrc::global_routing) {
+  if (parasitics_src_ == ParasiticsSrc::global_routing
+      || parasitics_src_ == ParasiticsSrc::detailed_routing) {
     opendp_->initMacrosAndGrid();
   }
   repair_design_->repairDesign(
@@ -2845,7 +2847,8 @@ void Resizer::repairSetup(double setup_margin,
   utl::SetAndRestore<bool> set_match_footprint(match_cell_footprint_,
                                                match_cell_footprint);
   resizePreamble();
-  if (parasitics_src_ == ParasiticsSrc::global_routing) {
+  if (parasitics_src_ == ParasiticsSrc::global_routing
+      || parasitics_src_ == ParasiticsSrc::detailed_routing) {
     opendp_->initMacrosAndGrid();
   }
   repair_setup_->repairSetup(setup_margin,
@@ -2903,7 +2906,8 @@ void Resizer::repairHold(
                                                  LibertyCellSeq());
 
   resizePreamble();
-  if (parasitics_src_ == ParasiticsSrc::global_routing) {
+  if (parasitics_src_ == ParasiticsSrc::global_routing
+      || parasitics_src_ == ParasiticsSrc::detailed_routing) {
     opendp_->initMacrosAndGrid();
   }
   repair_hold_->repairHold(setup_margin,
@@ -2948,7 +2952,8 @@ void Resizer::recoverPower(float recover_power_percent,
   utl::SetAndRestore<bool> set_match_footprint(match_cell_footprint_,
                                                match_cell_footprint);
   resizePreamble();
-  if (parasitics_src_ == ParasiticsSrc::global_routing) {
+  if (parasitics_src_ == ParasiticsSrc::global_routing
+      || parasitics_src_ == ParasiticsSrc::detailed_routing) {
     opendp_->initMacrosAndGrid();
   }
   recover_power_->recoverPower(recover_power_percent);
@@ -3479,7 +3484,8 @@ Instance* Resizer::makeInstance(LibertyCell* cell,
   db_inst->setSourceType(odb::dbSourceType::TIMING);
   setLocation(db_inst, loc);
   // Legalize the position of the instance in case it leaves the die
-  if (parasitics_src_ == ParasiticsSrc::global_routing) {
+  if (parasitics_src_ == ParasiticsSrc::global_routing
+      || parasitics_src_ == ParasiticsSrc::detailed_routing) {
     opendp_->legalCellPos(db_inst);
   }
   designAreaIncr(area(db_inst->getMaster()));
diff --git a/src/rsz/src/Resizer.i b/src/rsz/src/Resizer.i
index 5240fcc06e3..73415807ade 100644
--- a/src/rsz/src/Resizer.i
+++ b/src/rsz/src/Resizer.i
@@ -213,6 +213,8 @@ tclListNetworkSet(Tcl_Obj *const source,
     $1 = ParasiticsSrc::placement;
   else if (stringEq(arg, "global_routing"))
     $1 = ParasiticsSrc::global_routing;
+  else if (stringEq(arg, "detailed_routing"))
+    $1 = ParasiticsSrc::detailed_routing;
   else {
     Tcl_SetResult(interp,const_cast<char*>("Error: parasitics source."), TCL_STATIC);
     return TCL_ERROR;
@@ -816,6 +818,13 @@ set_worst_slack_nets_percent(float percent)
   resizer->setWorstSlackNetsPercent(percent);
 }
 
+void
+set_parasitics_src(ParasiticsSrc src)
+{
+  Resizer *resizer = getResizer();
+  resizer->setParasiticsSrc(src);
+}
+
 } // namespace
 
 %} // inline
diff --git a/src/rsz/src/Resizer.tcl b/src/rsz/src/Resizer.tcl
index 19b765a95f9..e8871e8aadb 100644
--- a/src/rsz/src/Resizer.tcl
+++ b/src/rsz/src/Resizer.tcl
@@ -613,6 +613,9 @@ proc repair_timing { args } {
   }
 
   set match_cell_footprint [info exists flags(-match_cell_footprint)]
+  if { [design_is_routed] } {
+    rsz::set_parasitics_src "detailed_routing"
+  }
 
   sta::check_argc_eq0 "repair_timing" $args
   rsz::check_parasitics