diff --git a/SPTInstaller/Helpers/DirectorySizeHelper.cs b/SPTInstaller/Helpers/DirectorySizeHelper.cs
new file mode 100644
index 0000000..9aef26b
--- /dev/null
+++ b/SPTInstaller/Helpers/DirectorySizeHelper.cs
@@ -0,0 +1,46 @@
+using System;
+using System.IO;
+using System.Linq;
+using Serilog;
+using SPTInstaller.Models;
+
+namespace SPTInstaller.Helpers
+{
+    public static class DirectorySizeHelper
+    {
+        public static Result CheckAvailableSize(string eftSourceDirPath, string installTargetDirPath)
+        {
+            try
+            {
+                var eftSourceDirectoryInfo = new DirectoryInfo(eftSourceDirPath);
+                var installTargetDirectoryInfo = new DirectoryInfo(installTargetDirPath);
+                
+                var eftSourceDirSize = GetSizeOfDirectory(eftSourceDirectoryInfo);
+                var availableSize = DriveInfo.GetDrives().FirstOrDefault(d => d.Name == installTargetDirectoryInfo.Root.Name)?.AvailableFreeSpace ?? 0;
+
+                if (eftSourceDirSize > availableSize)
+                {
+                    return Result.FromError($"Not enough space on drive {installTargetDirectoryInfo.Root.Name}.\n\nRequired: {FormatFileSize(eftSourceDirSize)}\nAvailable: {FormatFileSize(availableSize)}");
+                }
+
+                return Result.FromSuccess();
+            }
+            catch (Exception ex)
+            {
+                Log.Error(ex, "Error while checking available size");
+
+                return Result.FromError(ex.Message);
+            }
+        }
+        
+        private static long GetSizeOfDirectory(DirectoryInfo sourceDir) => sourceDir.EnumerateFiles("*", SearchOption.AllDirectories).Sum(fi => fi.Length);
+
+        private static string FormatFileSize(long bytes)
+        {
+            const int unit = 1024;
+            var exp = (int)(Math.Log(bytes) / Math.Log(unit));
+
+            return $"{bytes / Math.Pow(unit, exp):F2} {"KMGTPE"[exp - 1]}B";
+        }
+    }
+}
\ No newline at end of file
diff --git a/SPTInstaller/Installer Tasks/IntializationTask.cs b/SPTInstaller/Installer Tasks/IntializationTask.cs
index 6fdafc8..1f024f6 100644
--- a/SPTInstaller/Installer Tasks/IntializationTask.cs	
+++ b/SPTInstaller/Installer Tasks/IntializationTask.cs	
@@ -3,6 +3,7 @@ using SPTInstaller.Interfaces;
 using SPTInstaller.Models;
 using System.IO;
 using System.Threading.Tasks;
+using SPTInstaller.Helpers;
 
 namespace SPTInstaller.Installer_Tasks
 {
@@ -28,6 +29,12 @@ namespace SPTInstaller.Installer_Tasks
 
             SetStatus(null, $"Installed EFT Game Path: {FileHelper.GetRedactedPath(_data.OriginalGamePath)}");
 
+            var directorySizeCheckResult = DirectorySizeHelper.CheckAvailableSize(_data.OriginalGamePath, _data.TargetInstallPath);
+            if (!directorySizeCheckResult.Succeeded)
+            {
+                return Result.FromError(directorySizeCheckResult.Message);
+            }
+            
             var result = PreCheckHelper.DetectOriginalGameVersion(_data.OriginalGamePath);
 
             if (!result.Succeeded)