diff --git a/CHANGES b/CHANGES
index 0274739413e..af7b50cf1ff 100644
--- a/CHANGES
+++ b/CHANGES
@@ -23,6 +23,7 @@ Incompatible changes
 * #11373: Removed deprecated ``sphinx.util.get_matching_files()`` function.
 * #11378: Remove deprecated ``sphinx.util.docutils.is_html5_writer_available()``
   function.
+* #11379: Make the ``env`` argument to ``Builder`` subclasses required.
 
 Deprecated
 ----------
diff --git a/sphinx/application.py b/sphinx/application.py
index 58e61f7ec39..67b32269303 100644
--- a/sphinx/application.py
+++ b/sphinx/application.py
@@ -335,8 +335,6 @@ def create_builder(self, name: str) -> Builder:
         return self.registry.create_builder(self, name, self.env)
 
     def _init_builder(self) -> None:
-        if not hasattr(self.builder, "env"):
-            self.builder.set_environment(self.env)
         self.builder.init()
         self.events.emit('builder-inited')
 
diff --git a/sphinx/builders/__init__.py b/sphinx/builders/__init__.py
index 20e0c0af117..852f252596e 100644
--- a/sphinx/builders/__init__.py
+++ b/sphinx/builders/__init__.py
@@ -5,7 +5,6 @@
 import codecs
 import pickle
 import time
-import warnings
 from os import path
 from typing import TYPE_CHECKING, Any, Iterable, Sequence
 
@@ -14,7 +13,6 @@
 from docutils.utils import DependencyList
 
 from sphinx.config import Config
-from sphinx.deprecation import RemovedInSphinx70Warning
 from sphinx.environment import CONFIG_CHANGED_REASON, CONFIG_OK, BuildEnvironment
 from sphinx.environment.adapters.asset import ImageAdapter
 from sphinx.errors import SphinxError
@@ -79,7 +77,7 @@ class Builder:
     #: The builder supports data URIs or not.
     supported_data_uri_images = False
 
-    def __init__(self, app: Sphinx, env: BuildEnvironment = None) -> None:
+    def __init__(self, app: Sphinx, env: BuildEnvironment) -> None:
         self.srcdir = app.srcdir
         self.confdir = app.confdir
         self.outdir = app.outdir
@@ -87,15 +85,9 @@ def __init__(self, app: Sphinx, env: BuildEnvironment = None) -> None:
         ensuredir(self.doctreedir)
 
         self.app: Sphinx = app
-        if env is not None:
-            self.env: BuildEnvironment = env
-            self.env.set_versioning_method(self.versioning_method,
-                                           self.versioning_compare)
-        else:
-            # ... is passed by SphinxComponentRegistry.create_builder to not show two warnings.
-            warnings.warn("The 'env' argument to Builder will be required from Sphinx 7.",
-                          RemovedInSphinx70Warning, stacklevel=2)
-            self.env = None
+        self.env: BuildEnvironment = env
+        self.env.set_versioning_method(self.versioning_method,
+                                       self.versioning_compare)
         self.events: EventManager = app.events
         self.config: Config = app.config
         self.tags: Tags = app.tags
@@ -115,15 +107,6 @@ def __init__(self, app: Sphinx, env: BuildEnvironment = None) -> None:
         self.parallel_ok = False
         self.finish_tasks: Any = None
 
-    def set_environment(self, env: BuildEnvironment) -> None:
-        """Store BuildEnvironment object."""
-        warnings.warn("Builder.set_environment is deprecated, pass env to "
-                      "'Builder.__init__()' instead.",
-                      RemovedInSphinx70Warning, stacklevel=2)
-        self.env = env
-        self.env.set_versioning_method(self.versioning_method,
-                                       self.versioning_compare)
-
     def get_translator_class(self, *args: Any) -> type[nodes.NodeVisitor]:
         """Return a class of translator."""
         return self.app.registry.get_translator_class(self)
diff --git a/sphinx/registry.py b/sphinx/registry.py
index a3134bd2a4d..eba9f755610 100644
--- a/sphinx/registry.py
+++ b/sphinx/registry.py
@@ -4,7 +4,6 @@
 
 import sys
 import traceback
-import warnings
 from importlib import import_module
 from types import MethodType
 from typing import TYPE_CHECKING, Any, Callable, Iterator
@@ -23,7 +22,6 @@
 
 from sphinx.builders import Builder
 from sphinx.config import Config
-from sphinx.deprecation import RemovedInSphinx70Warning
 from sphinx.domains import Domain, Index, ObjType
 from sphinx.domains.std import GenericObject, Target
 from sphinx.environment import BuildEnvironment
@@ -156,18 +154,7 @@ def create_builder(self, app: Sphinx, name: str,
         if name not in self.builders:
             raise SphinxError(__('Builder name %s not registered') % name)
 
-        try:
-            return self.builders[name](app, env)
-        except TypeError:
-            warnings.warn(
-                f"The custom builder {name} defines a custom __init__ method without the "
-                f"'env'argument. Report this bug to the developers of your custom builder, "
-                f"this is likely not a issue with Sphinx. The 'env' argument will be required "
-                f"from Sphinx 7.", RemovedInSphinx70Warning, stacklevel=2)
-            builder = self.builders[name](app)
-            if env is not None:
-                builder.set_environment(env)
-            return builder
+        return self.builders[name](app, env)
 
     def add_domain(self, domain: type[Domain], override: bool = False) -> None:
         logger.debug('[app] adding domain: %r', domain)