diff --git a/web/src/app/error.tsx b/web/src/app/error.tsx
new file mode 100644
index 0000000..60e749c
--- /dev/null
+++ b/web/src/app/error.tsx
@@ -0,0 +1,16 @@
+"use client";
+
+function ErrorPage() {
+  return (
+    <main className="site-main" id="main">
+      <div>
+        <h1>500: En feil har oppstått</h1>
+        <p className="lead">
+          Her gikk det skikkelig skeis i datamaskinen. Lykke til videre.
+        </p>
+      </div>
+    </main>
+  );
+}
+
+export default ErrorPage;
diff --git a/web/src/app/not-found.tsx b/web/src/app/not-found.tsx
new file mode 100644
index 0000000..c2ef8e9
--- /dev/null
+++ b/web/src/app/not-found.tsx
@@ -0,0 +1,12 @@
+function NotFoundPage() {
+  return (
+    <main className="site-main" id="main">
+      <div>
+        <h1>404: Side ikke funnet</h1>
+        <p className="lead">Denne siden er på grisefest. Lykke til videre.</p>
+      </div>
+    </main>
+  );
+}
+
+export default NotFoundPage;
\ No newline at end of file