diff --git a/slpkg/checks.py b/slpkg/checks.py
new file mode 100644
index 00000000..2e39302e
--- /dev/null
+++ b/slpkg/checks.py
@@ -0,0 +1,51 @@
+#!/usr/bin/python3
+# -*- coding: utf-8 -*-
+
+import os
+from dataclasses import dataclass
+
+from slpkg.metadata import Metadata
+from slpkg.queries import SBoQueries
+from slpkg.blacklist import Blacklist
+
+
+@dataclass
+class Check:
+    log_packages: str = Metadata.log_packages
+    repo_tag: str = Metadata.repo_tag
+
+    def exists(self, slackbuilds):
+        ''' Checking if the slackbuild exists in the repository. '''
+        self.database()
+        for sbo in slackbuilds:
+            if not SBoQueries(sbo).slackbuild():
+                raise SystemExit(f'\nPackage {sbo} does not exists.\n')
+
+    def unsupported(self, slackbuilds):
+        ''' Checking for unsupported slackbuilds. '''
+        for sbo in slackbuilds:
+            sources = SBoQueries(sbo).sources()
+            if 'UNSUPPORTED' in sources:
+                raise SystemExit(f'\nPackage {sbo} unsupported by arch.\n')
+
+    def installed(self, slackbuilds):
+        ''' Checking for installed packages. '''
+        for package in os.listdir(self.log_packages):
+            for sbo in slackbuilds:
+                if sbo + '-' in package and self.repo_tag in package:
+                    return
+        raise SystemExit('\nNot found packages for remove.\n')
+
+    def blacklist(self, slackbuilds):
+        ''' Checking for packages on the blacklist and removing them. '''
+        black = Blacklist()
+        for package in black.get():
+            if package in slackbuilds:
+                slackbuilds.remove(package)
+        return slackbuilds
+
+    def database(self):
+        ''' Checking for empty table '''
+        if not SBoQueries('').names():
+            raise SystemExit('\nYou need to update the package lists first.\n'
+                             'Please run slpkg update.\n')