diff --git a/data/processing/subdomain.py b/data/processing/subdomain.py
index a2d6e13..54113cc 100644
--- a/data/processing/subdomain.py
+++ b/data/processing/subdomain.py
@@ -35,6 +35,7 @@ log.debug(f"domain: {domain}")
 
 inp_root = pathlib.Path(config.get("inp", "root"))
 out_root = pathlib.Path(config.get("out", "root"))
+out_root.mkdir(exist_ok=True)
 bathy_inp = inp_root.joinpath(config.get("inp", "base"))
 bathy_out = out_root.joinpath(config.get("out", "sub"))
 log.info(f"Reading bathymetry from '{bathy_inp}'")