diff --git a/etl/join-camden.json b/etl/join-camden.json
new file mode 100644
index 00000000..a761eb9b
--- /dev/null
+++ b/etl/join-camden.json
@@ -0,0 +1,7 @@
+{
+    "crs": 27700,
+    "mapping": [
+        ["Date_sou_1", "date_source", "lambda old_, new_: new_"],
+        ["Year_C", "date_year", "lambda old_, new_: int(new_)"]
+    ]
+}
\ No newline at end of file
diff --git a/etl/join-fitzrovia.json b/etl/join-fitzrovia.json
new file mode 100644
index 00000000..d0646c80
--- /dev/null
+++ b/etl/join-fitzrovia.json
@@ -0,0 +1,6 @@
+{
+    "crs": 27700,
+    "mapping": [
+        ["Storeys", "size_storeys", "lambda old_, new_: int(new_) if new_ is not None else None"]
+    ]
+}
\ No newline at end of file