diff --git a/zorg/buildbot/builders/HtmlSphinxDocsBuilder.py b/zorg/buildbot/builders/HtmlSphinxDocsBuilder.py
new file mode 100644
--- /dev/null
+++ b/zorg/buildbot/builders/HtmlSphinxDocsBuilder.py
@@ -0,0 +1,105 @@
+from collections import OrderedDict
+from importlib import reload
+
+from buildbot.plugins import steps, util
+from buildbot.steps.shell import ShellCommand
+from buildbot.steps.shell import WarningCountingShellCommand
+
+from zorg.buildbot.process import factory
+reload(factory)
+
+llvm_docs = OrderedDict([
+  # Project   Build target  Build path    Local path       Remote path
+  ("lnt",     ("html",      "docs",       "_build/html/",  "lnt")),
+])
+
+# We build with make for now. Change later if needed.
+build_cmd = 'make'
+
+def getHtmlDocsBuildFactory(
+        depends_on_projects = None,
+        clean = False,
+        env = None,
+        **kwargs):
+
+    if depends_on_projects is None:
+        # All the projects by default.
+        _depends_on_projects=llvm_docs.keys()
+    else:
+        # Make a local copy of depends_on_projects, as we are going to modify
+        # that.
+        _depends_on_projects=depends_on_projects[:]
+
+    # Prepare environmental variables. Set here all env we want everywhere.
+    merged_env = {
+        'TERM' : 'dumb' # Be cautious and disable color output from all tools.
+    }
+    if env is not None:
+        # Overwrite pre-set items with the given ones, so user can set anything.
+        merged_env.update(env)
+
+    # HTML Sphinx documentation builds in tree, each in its own directory.
+    # For that, make sure the obj_dir is the same as llvm_srcdir.
+    src_dir = kwargs.pop('llvm_srcdir', '.')
+    f = factory.LLVMBuildFactory(
+            clean=clean,
+            depends_on_projects=_depends_on_projects,
+            llvm_srcdir=src_dir,
+            obj_dir=src_dir,
+            **kwargs) # Pass through all the extra arguments.
+
+    # Build the documentation
+    for project in llvm_docs:
+
+        # Checkout the source code and remove all the untracked files, so
+        # we would build a fresh new documentation.
+        f.addStep(
+            steps.Git(
+                name='Checkout the {} source code'.format(project),
+                repourl=f.repourl_prefix + "llvm-{}.git".format(project),
+                mode='full',
+                method='fresh',
+                progress=True,
+                workdir=util.WithProperties(project),
+                env=merged_env,
+                **kwargs))
+
+        target, build_path, local_path, remote_path = llvm_docs[project]
+
+        build_dir = util.WithProperties(
+                            "{}".format("/".join([
+                                project,
+                                build_path])))
+        f.addStep(
+            steps.WarningCountingShellCommand(
+                name="Build {} documentation".format(project),
+                command=[build_cmd, target],
+                haltOnFailure=True,
+                workdir=build_dir,
+                env=merged_env,
+                **kwargs))
+
+        # Publish just built documentation
+        f.addStep(
+            ShellCommand(
+                name="Publish {}".format(project),
+                description=[
+                    "Publish", "just", "built", "documentation", "for",
+                    "{}".format(project)
+                    ],
+                command=[
+                    'rsync',
+                    '-vrl',
+                    '--delete', '--force', '--delay-updates', '--delete-delay',
+                    '--ignore-times',
+                    '--checksum',
+                    '-p', '--chmod=Du=rwx,Dg=rwx,Do=rx,Fu=rw,Fg=rw,Fo=r',
+                    "{}".format(local_path),
+                    "lists.llvm.org:web/{}".format(remote_path),
+                    ],
+                workdir=build_dir,
+                env=merged_env,
+            )
+        )
+
+    return f