diff --git a/src/components/Ausweis/GebaeudeDaten.svelte b/src/components/Ausweis/GebaeudeDaten.svelte
index f06764b5..e2ac4557 100644
--- a/src/components/Ausweis/GebaeudeDaten.svelte
+++ b/src/components/Ausweis/GebaeudeDaten.svelte
@@ -11,6 +11,22 @@
 	export let objekt: ObjektClient;
 
 	export let ausweisart: Enums.Ausweisart;
+
+	function onlyAllowIntegerInput(event: KeyboardEvent) {
+		const charCode = event.which || event.keyCode;
+		// Allow only numbers (0-9) and control keys (e.g., backspace)
+		if (charCode < 48 || charCode > 57) {
+			event.preventDefault();
+		}
+	}
+
+	function onlyAllowPastingIntegers(event: ClipboardEvent) {
+		const clipboardData = event.clipboardData || (window as any).clipboardData;
+		const pastedData = clipboardData.getData("Text");
+		if (!/^\d+$/.test(pastedData)) {
+			event.preventDefault();
+		}
+	}
 </script>
 
 <div
@@ -100,6 +116,8 @@ xl:grid-cols-3 xl:gap-x-8 xl:gap-y-8
 				step="1"
 				required
 				autocomplete="off"
+				on:keypress={onlyAllowIntegerInput}
+				on:paste={onlyAllowPastingIntegers}
 				bind:value={aufnahme.flaeche}
 			/>
 
@@ -125,6 +143,8 @@ xl:grid-cols-3 xl:gap-x-8 xl:gap-y-8
 				type="number"
 				step="1"
 				required
+				on:keypress={onlyAllowIntegerInput}
+				on:paste={onlyAllowPastingIntegers}
 				bind:value={aufnahme.nutzflaeche}
 			/>