diff --git a/synapse/events/builder.py b/synapse/events/builder.py
new file mode 100644
index 0000000000..9579b1fe8b
--- /dev/null
+++ b/synapse/events/builder.py
@@ -0,0 +1,77 @@
+# -*- coding: utf-8 -*-
+# Copyright 2014 OpenMarket Ltd
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+from . import EventBase, FrozenEvent
+
+from synapse.types import EventID
+
+from synapse.util.stringutils import random_string
+
+import copy
+
+
+class EventBuilder(EventBase):
+ def __init__(self, key_values={}):
+ signatures = copy.deepcopy(key_values.pop("signatures", {}))
+ unsigned = copy.deepcopy(key_values.pop("unsigned", {}))
+
+ super(EventBuilder, self).__init__(
+ key_values,
+ signatures=signatures,
+ unsigned=unsigned
+ )
+
+ def update_event_key(self, key, value):
+ self._event_dict[key] = value
+
+ def update_event_keys(self, other_dict):
+ self._event_dict.update(other_dict)
+
+ def build(self):
+ return FrozenEvent.from_event(self)
+
+
+class EventBuilderFactory(object):
+ def __init__(self, clock, hostname):
+ self.clock = clock
+ self.hostname = hostname
+
+ self.event_id_count = 0
+
+ def create_event_id(self):
+ i = str(self.event_id_count)
+ self.event_id_count += 1
+
+ local_part = str(int(self.clock.time())) + i + random_string(5)
+
+ e_id = EventID.create(local_part, self.hostname)
+
+ return e_id.to_string()
+
+ def new(self, key_values={}):
+ key_values["event_id"] = self.create_event_id()
+
+ time_now = int(self.clock.time_msec())
+
+ key_values.setdefault("origin", self.hostname)
+ key_values.setdefault("origin_server_ts", time_now)
+
+ key_values.setdefault("unsigned", {})
+ age = key_values["unsigned"].pop("age", 0)
+ key_values["unsigned"].setdefault("age_ts", time_now - age)
+
+ key_values["signatures"] = {}
+
+ return EventBuilder(key_values=key_values,)
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