diff --git a/src/fmu/settings/models/project_config.py b/src/fmu/settings/models/project_config.py
index c6dc5c5..8c12380 100644
--- a/src/fmu/settings/models/project_config.py
+++ b/src/fmu/settings/models/project_config.py
@@ -74,6 +74,26 @@ class RmsProject(BaseModel):
     wells: list[RmsWell] | None = None
 
 
+class ValidationRecord(BaseModel):
+    """Metadata for a successful validation of project configuration data."""
+
+    last_validated_at: AwareDatetime
+    """Timestamp when the data was last validated."""
+
+    last_validated_by: str
+    """User who performed the last validation."""
+
+
+class ProjectValidation(BaseModel):
+    """Validation metadata for project configuration data."""
+
+    masterdata_smda: ValidationRecord | None = None
+    """Validation metadata for masterdata checked against SMDA."""
+
+    rms_project: ValidationRecord | None = None
+    """Validation metadata for RMS configuration checked against the RMS project."""
+
+
 class ProjectConfig(ResettableBaseModel):
     """The configuration file in a .fmu directory.
 
@@ -93,6 +113,7 @@ class ProjectConfig(ResettableBaseModel):
     access: Access | None = None
     cache_max_revisions: int = Field(default=5, ge=5)
     rms: RmsProject | None = None
+    validation: ProjectValidation = Field(default_factory=ProjectValidation)
 
     @classmethod
     def reset(cls: type[Self]) -> Self:
@@ -112,4 +133,5 @@ def reset(cls: type[Self]) -> Self:
             access=None,
             cache_max_revisions=5,
             rms=None,
+            validation=ProjectValidation(),
         )
diff --git a/tests/conftest.py b/tests/conftest.py
index ba8ddb6..161f29a 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -99,6 +99,10 @@ def config_dict(unix_epoch_utc: datetime) -> dict[str, Any]:
         "model": None,
         "access": None,
         "rms": None,
+        "validation": {
+            "masterdata_smda": None,
+            "rms_project": None,
+        },
     }
 
 
@@ -347,6 +351,16 @@ def mocked_project_config_with_all_fields(
         "model": model_dict,
         "access": access_dict,
         "rms": rms_project,
+        "validation": {
+            "masterdata_smda": {
+                "last_validated_at": unix_epoch_utc,
+                "last_validated_by": "user",
+            },
+            "rms_project": {
+                "last_validated_at": unix_epoch_utc,
+                "last_validated_by": "user",
+            },
+        },
     }