diff --git a/packages/essreduce/pyproject.toml b/packages/essreduce/pyproject.toml
index b0418a347..b2e496b7f 100644
--- a/packages/essreduce/pyproject.toml
+++ b/packages/essreduce/pyproject.toml
@@ -32,6 +32,7 @@ dynamic = ["version"]
 dependencies = [
     "dask>=2022.1.0",
     "graphviz>=0.20",
+    "lazy_loader>=0.4",
     "sciline>=25.11.0",
     "scipp>=26.3.1",
     "scippneutron>=26.6.0",
diff --git a/packages/essreduce/src/ess/reduce/__init__.py b/packages/essreduce/src/ess/reduce/__init__.py
index 873581316..3d5936efd 100644
--- a/packages/essreduce/src/ess/reduce/__init__.py
+++ b/packages/essreduce/src/ess/reduce/__init__.py
@@ -3,7 +3,7 @@
 
 import importlib.metadata
 
-from . import nexus, normalization, polarization, uncertainty, unwrap
+import lazy_loader as lazy
 
 try:
     __version__ = importlib.metadata.version("essreduce")
@@ -12,4 +12,14 @@
 
 del importlib
 
-__all__ = ["nexus", "normalization", "polarization", "uncertainty", "unwrap"]
+__getattr__, __dir__, __all__ = lazy.attach(
+    __name__,
+    submodules=[
+        "nexus",
+        "normalization",
+        "polarization",
+        "streaming",
+        "uncertainty",
+        "unwrap",
+    ],
+)
diff --git a/packages/essreduce/src/ess/reduce/__init__.pyi b/packages/essreduce/src/ess/reduce/__init__.pyi
new file mode 100644
index 000000000..04cdbeaf9
--- /dev/null
+++ b/packages/essreduce/src/ess/reduce/__init__.pyi
@@ -0,0 +1,13 @@
+# SPDX-License-Identifier: BSD-3-Clause
+# Copyright (c) 2025 Scipp contributors (https://github.com/scipp)
+
+from . import (
+    nexus,  # noqa: F401
+    normalization,  # noqa: F401
+    polarization,  # noqa: F401
+    streaming,  # noqa: F401
+    uncertainty,  # noqa: F401
+    unwrap,  # noqa: F401
+)
+
+__version__: str