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diff --git a/bsie/base/errors.py b/bsie/base/errors.py
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+++ b/bsie/base/errors.py
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+"""Common BSIE exceptions.
+
+Part of the bsie module.
+A copy of the license is provided with the project.
+Author: Matthias Baumgartner, 2022
+"""
+# imports
+import typing
+
+# exports
+__all__: typing.Sequence[str] = (
+    'BuilderError',
+    'ExtractorError',
+    'LoaderError',
+    'ReaderError',
+    )
+
+
+## code ##
+
+class _BSIEError(Exception):
+    """Generic BSIE error."""
+
+class BuilderError(_BSIEError):
+    """The Builder failed to create an instance."""
+
+class LoaderError(BuilderError):
+    """Failed to load a module or class."""
+
+class ExtractorError(_BSIEError):
+    """The Extractor failed to process the given content."""
+
+class ReaderError(_BSIEError):
+    """The Reader failed to read the given file."""
+
+class ProgrammingError(_BSIEError):
+    """An assertion-like error that indicates a code-base issue."""
+
+class UnreachableError(ProgrammingError):
+    """Bravo, you've reached a point in code that should logically not be reachable."""
+
+## EOF ##