diff --git a/example/t01-services/synoptic/techui.yaml b/example/t01-services/synoptic/techui.yaml
index 74daf576..ffd9f59a 100644
--- a/example/t01-services/synoptic/techui.yaml
+++ b/example/t01-services/synoptic/techui.yaml
@@ -1,7 +1,7 @@
 # create_gui example for Phoebus GuiBuilder
 beamline:
-  location: t01
-  domain: bl01t
+  location: bl01t
+  domain: t01
   desc: Test Beamline
   url: t01-opis.diamond.ac.uk
 
diff --git a/src/techui_builder/builder.py b/src/techui_builder/builder.py
index af9b7d0e..3f44b0ec 100644
--- a/src/techui_builder/builder.py
+++ b/src/techui_builder/builder.py
@@ -105,7 +105,7 @@ def _extract_services(self):
         """
 
         # Loop over every dir in services, ignoring anything that isn't a service
-        for service in self._services_dir.glob(f"{self.conf.beamline.domain}-*-*-*"):
+        for service in self._services_dir.glob(f"{self.conf.beamline.location}-*-*-*"):
             service_name = service.name
             # If service doesn't exist, file open will fail throwing exception
             try:
diff --git a/src/techui_builder/models.py b/src/techui_builder/models.py
index 20130b4e..63909e13 100644
--- a/src/techui_builder/models.py
+++ b/src/techui_builder/models.py
@@ -50,40 +50,40 @@
     r"(?:PP|NPP)?" + r"(?:[ ]+(?:MS|NMS|MSS|MSI))?$",
     re.VERBOSE,
 )
-_DOMAIN_RE = re.compile(r"^[a-zA-Z]{2}\d{2}[a-zA-Z]$")
-_LOCATION_RE = re.compile(r"^[a-zA-Z]{1}\d{2}(-[0-9]{1})?$")
+_LOCATION_RE = re.compile(r"^[a-zA-Z]{2}\d{2}[a-zA-Z]$")
+_DOMAIN_RE = re.compile(r"^[a-zA-Z]{1}\d{2}(-[0-9]{1})?$")
 _OPIS_URL_RE = re.compile(r"^(https:\/\/)?([a-z0-9]{3}-(?:[0-9]-)?opis(?:.[a-z0-9]*)*)")
 
 
 class Beamline(BaseModel):
     """Global Beamline values read from `beamline:` table in techui.yaml"""
 
-    location: Annotated[str, Field(description="Short BL location e.g. b23, ixx-1")]
-    domain: Annotated[str, Field(description="Full BL domain e.g. bl23b")]
+    domain: Annotated[str, Field(description="Short BL location e.g. b23, ixx-1")]
+    location: Annotated[str, Field(description="Full BL domain e.g. bl23b")]
     desc: Annotated[str, Field(description="Description")]
     url: Annotated[str, Field(description="URL of ixx-opis")]
     model_config = ConfigDict(extra="forbid")
 
-    @field_validator("location")
+    @field_validator("domain")
     @classmethod
-    def normalize_location(cls, v: str) -> str:
+    def normalize_domain(cls, v: str) -> str:
         v = v.strip().lower()
 
-        if _LOCATION_RE.fullmatch(v):
-            # e.g. b23 -> bl23b
+        if _DOMAIN_RE.fullmatch(v):
+            # e.g. t01
             return v
 
-        raise ValueError("Invalid beamline location.")
+        raise ValueError("Invalid beamline domain.")
 
-    @field_validator("domain")
+    @field_validator("location")
     @classmethod
-    def normalize_domain(cls, v: str) -> str:
+    def normalize_location(cls, v: str) -> str:
         v = v.strip().lower()
-        if _DOMAIN_RE.fullmatch(v):
-            # already long: bl23b
+        if _LOCATION_RE.fullmatch(v):
+            # already long: bl01t
             return v
 
-        raise ValueError("Invalid beamline domain.")
+        raise ValueError("Invalid beamline location.")
 
     @field_validator("url")
     @classmethod
diff --git a/tests/test_builder.py b/tests/test_builder.py
index eb4733dd..653bee05 100644
--- a/tests/test_builder.py
+++ b/tests/test_builder.py
@@ -8,8 +8,8 @@
 @pytest.mark.parametrize(
     "attr, expected",
     [
-        ("location", "t01"),
-        ("domain", "bl01t"),
+        ("location", "bl01t"),
+        ("domain", "t01"),
         ("desc", "Test Beamline"),
     ],
 )
@@ -152,7 +152,7 @@ def test_gb_extract_services_no_yaml_files(builder, caplog, tmp_path):
     builder._extract_entities = Mock()
 
     # overwrite to not see the bl01t service dirs
-    builder.conf.beamline.domain = "bl01z"
+    builder.conf.beamline.location = "bl01z"
     builder._services_dir = tmp_path
     # Temporary files to test against
     (tmp_path / "bl01z-ea-ioc-01").mkdir()
@@ -171,7 +171,7 @@ def test_gb_extract_services_both_yaml_files(builder, caplog, tmp_path):
     builder._extract_entities = Mock()
 
     # overwrite to not see the bl01t service dirs
-    builder.conf.beamline.domain = "bl01z"
+    builder.conf.beamline.location = "bl01z"
     builder._services_dir = tmp_path
     # Temporary files to test against
     (tmp_path / "bl01z-ea-ioc-01").mkdir()
diff --git a/tests/test_models.py b/tests/test_models.py
index a31d73ff..7d6c080d 100644
--- a/tests/test_models.py
+++ b/tests/test_models.py
@@ -11,8 +11,8 @@
 @pytest.fixture
 def beamline() -> Beamline:
     return Beamline(
-        location="t01",
-        domain="bl01t",
+        location="bl01t",
+        domain="t01",
         desc="Test Beamline",
         url="t01-opis.diamond.ac.uk",
     )
@@ -37,8 +37,8 @@ def gui_components() -> GuiComponentEntry:
 
 # @pytest.mark.parametrize("beamline,expected",[])
 def test_beamline_object(beamline: Beamline):
-    assert beamline.location == "t01"
-    assert beamline.domain == "bl01t"
+    assert beamline.location == "bl01t"
+    assert beamline.domain == "t01"
     assert beamline.desc == "Test Beamline"
     assert beamline.url == "https://t01-opis.diamond.ac.uk"