diff --git a/STYLE.md b/STYLE.md
index d932c3a3..92592d4a 100644
--- a/STYLE.md
+++ b/STYLE.md
@@ -131,3 +131,6 @@ the build system to prevent circular dependency formation. Package group
 `//envoy/api/v2:friends` selects consumers of the core API package (services and configs)
 and is the default visibility for the core API packages. The default visibility
 for services and configs should be `//docs` (proto documentation tool).
+
+Extensions should use the regular hierarchy. For example, configuration for network filters belongs
+in a package under `envoy.config.filter.network`.
diff --git a/envoy/extensions/filters/network/thrift_proxy/v2alpha1/BUILD b/envoy/config/filter/network/thrift_proxy/v2alpha1/BUILD
similarity index 100%
rename from envoy/extensions/filters/network/thrift_proxy/v2alpha1/BUILD
rename to envoy/config/filter/network/thrift_proxy/v2alpha1/BUILD
diff --git a/envoy/extensions/filters/network/thrift_proxy/v2alpha1/README.md b/envoy/config/filter/network/thrift_proxy/v2alpha1/README.md
similarity index 100%
rename from envoy/extensions/filters/network/thrift_proxy/v2alpha1/README.md
rename to envoy/config/filter/network/thrift_proxy/v2alpha1/README.md
diff --git a/envoy/extensions/filters/network/thrift_proxy/v2alpha1/route.proto b/envoy/config/filter/network/thrift_proxy/v2alpha1/route.proto
similarity index 95%
rename from envoy/extensions/filters/network/thrift_proxy/v2alpha1/route.proto
rename to envoy/config/filter/network/thrift_proxy/v2alpha1/route.proto
index 5c9af1c4..f70523e5 100644
--- a/envoy/extensions/filters/network/thrift_proxy/v2alpha1/route.proto
+++ b/envoy/config/filter/network/thrift_proxy/v2alpha1/route.proto
@@ -1,6 +1,6 @@
 syntax = "proto3";
 
-package envoy.extensions.filters.network.thrift_proxy.v2alpha1;
+package envoy.config.filter.network.thrift_proxy.v2alpha1;
 option go_package = "v2";
 
 import "validate/validate.proto";
diff --git a/envoy/extensions/filters/network/thrift_proxy/v2alpha1/router/BUILD b/envoy/config/filter/network/thrift_proxy/v2alpha1/router/BUILD
similarity index 100%
rename from envoy/extensions/filters/network/thrift_proxy/v2alpha1/router/BUILD
rename to envoy/config/filter/network/thrift_proxy/v2alpha1/router/BUILD
diff --git a/envoy/extensions/filters/network/thrift_proxy/v2alpha1/router/router.proto b/envoy/config/filter/network/thrift_proxy/v2alpha1/router/router.proto
similarity index 66%
rename from envoy/extensions/filters/network/thrift_proxy/v2alpha1/router/router.proto
rename to envoy/config/filter/network/thrift_proxy/v2alpha1/router/router.proto
index 2818c044..5ad9863b 100644
--- a/envoy/extensions/filters/network/thrift_proxy/v2alpha1/router/router.proto
+++ b/envoy/config/filter/network/thrift_proxy/v2alpha1/router/router.proto
@@ -1,6 +1,6 @@
 syntax = "proto3";
 
-package envoy.extensions.filters.network.thrift_proxy.v2alpha1.router;
+package envoy.config.filter.network.thrift_proxy.v2alpha1.router;
 option go_package = "router";
 
 // [#protodoc-title: Thrift Router]
diff --git a/envoy/extensions/filters/network/thrift_proxy/v2alpha1/thrift_proxy.proto b/envoy/config/filter/network/thrift_proxy/v2alpha1/thrift_proxy.proto
similarity index 93%
rename from envoy/extensions/filters/network/thrift_proxy/v2alpha1/thrift_proxy.proto
rename to envoy/config/filter/network/thrift_proxy/v2alpha1/thrift_proxy.proto
index 88972922..1a7176dc 100644
--- a/envoy/extensions/filters/network/thrift_proxy/v2alpha1/thrift_proxy.proto
+++ b/envoy/config/filter/network/thrift_proxy/v2alpha1/thrift_proxy.proto
@@ -1,9 +1,9 @@
 syntax = "proto3";
 
-package envoy.extensions.filters.network.thrift_proxy.v2alpha1;
+package envoy.config.filter.network.thrift_proxy.v2alpha1;
 option go_package = "v2";
 
-import "envoy/extensions/filters/network/thrift_proxy/v2alpha1/route.proto";
+import "envoy/config/filter/network/thrift_proxy/v2alpha1/route.proto";
 
 import "validate/validate.proto";
 import "gogoproto/gogo.proto";