diff --git a/README.md b/README.md
index bc0ed63..ebe6e25 100644
--- a/README.md
+++ b/README.md
@@ -35,7 +35,17 @@ bsc:
       query_tag: <TAG>
 ```
 
+### Variables
 
+To control the creation of UDF or SP macros with dbt run:
+* UPDATE_UDFS_AND_SPS
+When True, executes all macros included in the on-run-start hooks within dbt_project.yml on model run as normal
+When False, none of the on-run-start macros are executed on model run
+
+Default values are False
+
+* Usage:
+dbt run --var '{"UPDATE_UDFS_AND_SPS":True}'  -m ...
 
 ### Resources:
 - Learn more about dbt [in the docs](https://docs.getdbt.com/docs/introduction)
diff --git a/dbt_project.yml b/dbt_project.yml
index 57b773c..7495f42 100644
--- a/dbt_project.yml
+++ b/dbt_project.yml
@@ -40,3 +40,4 @@ on-run-start:
 
 vars:
   "dbt_date:time_zone": GMT
+  UPDATE_UDFS_AND_SPS: False
\ No newline at end of file
diff --git a/macros/create_sps.sql b/macros/create_sps.sql
index 063f5e6..211fffb 100644
--- a/macros/create_sps.sql
+++ b/macros/create_sps.sql
@@ -1,6 +1,8 @@
 {% macro create_sps() %}
-    {% if target.database == 'BSC' %}
-        CREATE schema IF NOT EXISTS _internal;
-{{ sp_create_prod_clone('_internal') }};
+    {% if var("UPDATE_UDFS_AND_SPS") %}
+        {% if target.database == 'BSC' %}
+            CREATE schema IF NOT EXISTS _internal;
+    {{ sp_create_prod_clone('_internal') }};
+        {% endif %}
     {% endif %}
 {% endmacro %}
diff --git a/macros/create_udfs.sql b/macros/create_udfs.sql
index cc04a84..916f09f 100644
--- a/macros/create_udfs.sql
+++ b/macros/create_udfs.sql
@@ -1,11 +1,13 @@
 {% macro create_udfs() %}
-    {% set sql %}
-    CREATE schema if NOT EXISTS silver;
-{{ create_js_hex_to_int() }};
-{{ create_udf_hex_to_int(
-        schema = "public"
-    ) }}
+    {% if var("UPDATE_UDFS_AND_SPS") %}
+        {% set sql %}
+        CREATE schema if NOT EXISTS silver;
+    {{ create_js_hex_to_int() }};
+    {{ create_udf_hex_to_int(
+            schema = "public"
+        ) }}
 
-    {% endset %}
-    {% do run_query(sql) %}
+        {% endset %}
+        {% do run_query(sql) %}
+    {% endif %}
 {% endmacro %}