diff --git a/res/values/strings.xml b/res/values/strings.xml
index 091debb908455858a91f2c53e5dc3c84cc18a317..00b712781d1cf1a76434acfc6d7d9a6f43e8a336 100644
--- a/res/values/strings.xml
+++ b/res/values/strings.xml
@@ -61,6 +61,8 @@
     <string name="dialog_prepare_zip_message">Preliminary update preparation</string>
     <string name="dialog_battery_low_title">Low battery</string>
     <string name="dialog_battery_low_message_pct">The battery level is too low, you need at least <xliff:g id="percent_discharging">%1$d</xliff:g>%% of the battery to continue, <xliff:g id="percent_charging">%2$d</xliff:g>%% if charging.</string>
+    <string name="dialog_free_space_low_title">Free up space</string>
+    <string name="dialog_free_space_low_message_pct">The update cannot be completed because there is insufficient free space; at least <xliff:g id="needed_free_space">%1$s</xliff:g> of free space is required. Please clear your internal storage before proceeding.</string>
 
     <string name="reboot">Reboot</string>
 
diff --git a/src/org/lineageos/updater/UpdatesActivity.java b/src/org/lineageos/updater/UpdatesActivity.java
index 173452f08973c7347a566620f5407604daccf8eb..9f6a4e552647c8e42ccd2377c27c87a9d575291e 100644
--- a/src/org/lineageos/updater/UpdatesActivity.java
+++ b/src/org/lineageos/updater/UpdatesActivity.java
@@ -23,9 +23,9 @@ import android.content.ComponentName;
 import android.content.Context;
 import android.content.Intent;
 import android.content.IntentFilter;
-import android.content.res.Configuration;
 import android.content.ServiceConnection;
 import android.content.SharedPreferences;
+import android.content.res.Configuration;
 import android.icu.text.DateFormat;
 import android.net.Uri;
 import android.os.Build;
diff --git a/src/org/lineageos/updater/UpdatesListAdapter.java b/src/org/lineageos/updater/UpdatesListAdapter.java
index 4566b88a0a5f33c6f8095e18534b99b7d2be67cd..04ad0028a463caf9793a2005b3ea517b9d7c1057 100644
--- a/src/org/lineageos/updater/UpdatesListAdapter.java
+++ b/src/org/lineageos/updater/UpdatesListAdapter.java
@@ -15,12 +15,10 @@
  */
 package org.lineageos.updater;
 
-import android.app.Activity;
 import android.content.Intent;
 import android.content.IntentFilter;
 import android.content.SharedPreferences;
 import android.content.res.Resources;
-import android.net.Uri;
 import android.os.BatteryManager;
 import android.os.PowerManager;
 import android.text.SpannableString;
@@ -40,8 +38,6 @@ import android.widget.LinearLayout;
 import android.widget.ProgressBar;
 import android.widget.TextView;
 
-import androidx.activity.result.ActivityResultLauncher;
-import androidx.activity.result.contract.ActivityResultContracts;
 import androidx.annotation.NonNull;
 import androidx.appcompat.app.AlertDialog;
 import androidx.appcompat.view.ContextThemeWrapper;
@@ -55,7 +51,6 @@ import com.google.android.material.snackbar.Snackbar;
 
 import org.lineageos.updater.controller.UpdaterController;
 import org.lineageos.updater.controller.UpdaterService;
-import org.lineageos.updater.misc.BuildInfoUtils;
 import org.lineageos.updater.misc.Constants;
 import org.lineageos.updater.misc.StringGenerator;
 import org.lineageos.updater.misc.Utils;
@@ -454,8 +449,8 @@ public class UpdatesListAdapter extends RecyclerView.Adapter<UpdatesListAdapter.
     }
 
     private AlertDialog.Builder getInstallDialog(final String downloadId) {
+        Resources resources = mActivity.getResources();
         if (!isBatteryLevelOk()) {
-            Resources resources = mActivity.getResources();
             String message = resources.getString(R.string.dialog_battery_low_message_pct,
                     resources.getInteger(R.integer.battery_ok_percentage_discharging),
                     resources.getInteger(R.integer.battery_ok_percentage_charging));
@@ -477,6 +472,17 @@ public class UpdatesListAdapter extends RecyclerView.Adapter<UpdatesListAdapter.
             return null;
         }
 
+        long neededSpace = update.getFileSize() * 2;
+        final boolean hasFreeSpace = Utils.availableFreeSpace() >= neededSpace;
+        if (!hasFreeSpace) {
+            String message = resources.getString(R.string.dialog_free_space_low_message_pct,
+                    Utils.getFileSize(neededSpace));
+            return new AlertDialog.Builder(mActivity)
+                    .setTitle(R.string.dialog_free_space_low_title)
+                    .setMessage(message)
+                    .setPositiveButton(android.R.string.ok, null);
+        }
+
         String buildDate = StringGenerator.getDateLocalizedUTC(mActivity,
                 DateFormat.MEDIUM, update.getTimestamp());
         String buildInfoText = mActivity.getString(R.string.list_build_version_date_e,
diff --git a/src/org/lineageos/updater/controller/UpdateInstaller.java b/src/org/lineageos/updater/controller/UpdateInstaller.java
index b111f9f33275d3810f6bd6a5f890f9d131591823..720d13ec5a5d45c17fb38b927ddbec20ff6f9326 100644
--- a/src/org/lineageos/updater/controller/UpdateInstaller.java
+++ b/src/org/lineageos/updater/controller/UpdateInstaller.java
@@ -31,8 +31,8 @@ import org.lineageos.updater.model.UpdateStatus;
 
 import java.io.File;
 import java.io.IOException;
-import java.nio.file.attribute.PosixFilePermission;
 import java.nio.file.Files;
+import java.nio.file.attribute.PosixFilePermission;
 import java.util.HashSet;
 import java.util.Set;
 
diff --git a/src/org/lineageos/updater/controller/UpdaterService.java b/src/org/lineageos/updater/controller/UpdaterService.java
index b71a4f686c7f765bdb566820c3ded1a9fbd21110..bf0139008208fd8316ded0101a0918d6cf4ab44e 100644
--- a/src/org/lineageos/updater/controller/UpdaterService.java
+++ b/src/org/lineageos/updater/controller/UpdaterService.java
@@ -41,7 +41,6 @@ import androidx.preference.PreferenceManager;
 import org.lineageos.updater.R;
 import org.lineageos.updater.UpdaterReceiver;
 import org.lineageos.updater.UpdatesActivity;
-import org.lineageos.updater.misc.BuildInfoUtils;
 import org.lineageos.updater.misc.Constants;
 import org.lineageos.updater.misc.StringGenerator;
 import org.lineageos.updater.misc.Utils;
diff --git a/src/org/lineageos/updater/download/HttpURLConnectionClient.java b/src/org/lineageos/updater/download/HttpURLConnectionClient.java
index df6283b5cb8bdc40f043a4d459c04a98e3f6619a..606bef16ccf08c3667eaea8bb5882966977953b3 100644
--- a/src/org/lineageos/updater/download/HttpURLConnectionClient.java
+++ b/src/org/lineageos/updater/download/HttpURLConnectionClient.java
@@ -17,9 +17,10 @@ package org.lineageos.updater.download;
 
 import android.os.SystemClock;
 import android.os.SystemProperties;
-
 import android.util.Log;
 
+import org.lineageos.updater.misc.Constants;
+
 import java.io.File;
 import java.io.FileOutputStream;
 import java.io.IOException;
@@ -34,8 +35,6 @@ import java.util.PriorityQueue;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
 
-import org.lineageos.updater.misc.Constants;
-
 public class HttpURLConnectionClient implements DownloadClient {
 
     private final static String TAG = "HttpURLConnectionClient";
diff --git a/src/org/lineageos/updater/misc/Utils.java b/src/org/lineageos/updater/misc/Utils.java
index 0a614ac7621f5118dd14555904d6d97a0ca1ffbf..7758b8ab2ecfbb0e426ea2bdb4d415a8712125a7 100644
--- a/src/org/lineageos/updater/misc/Utils.java
+++ b/src/org/lineageos/updater/misc/Utils.java
@@ -20,7 +20,6 @@ import static android.os.SystemUpdateManager.KEY_STATUS;
 import static android.os.SystemUpdateManager.KEY_TITLE;
 import static android.os.SystemUpdateManager.STATUS_IDLE;
 import static android.os.SystemUpdateManager.STATUS_WAITING_DOWNLOAD;
-import static android.os.SystemUpdateManager.STATUS_UNKNOWN;
 
 import android.app.AlarmManager;
 import android.content.ClipData;
@@ -35,7 +34,9 @@ import android.net.Network;
 import android.net.NetworkCapabilities;
 import android.net.Uri;
 import android.os.Bundle;
+import android.os.Environment;
 import android.os.PersistableBundle;
+import android.os.StatFs;
 import android.os.SystemProperties;
 import android.os.SystemUpdateManager;
 import android.os.storage.StorageManager;
@@ -59,15 +60,14 @@ import java.io.BufferedReader;
 import java.io.File;
 import java.io.FileReader;
 import java.io.IOException;
+import java.text.DecimalFormat;
 import java.util.ArrayList;
 import java.util.Enumeration;
-import java.util.HashSet;
 import java.util.List;
 import java.util.Locale;
-import java.util.Set;
+import java.util.regex.Pattern;
 import java.util.zip.ZipEntry;
 import java.util.zip.ZipFile;
-import java.util.regex.Pattern;
 
 public class Utils {
 
@@ -159,6 +159,20 @@ public class Utils {
         return new int[]{ major, minor };
     }
 
+    public static long availableFreeSpace() {
+        StatFs stats = new StatFs(Environment.getDataDirectory().getAbsolutePath());
+        return stats.getAvailableBlocksLong() * stats.getBlockSizeLong();
+    }
+
+    // https://stackoverflow.com/a/28527441
+    public static String getFileSize(long size) {
+        if (size <= 0)
+            return "0";
+        final String[] units = new String[] { "B", "KB", "MB", "GB", "TB" };
+        int digitGroups = (int) (Math.log10(size) / Math.log10(1024));
+        return new DecimalFormat("#,##0.#").format(size / Math.pow(1024, digitGroups)) + " " + units[digitGroups];
+    }
+
     public static boolean canInstall(UpdateBaseInfo update) {
         return (SystemProperties.getBoolean(Constants.PROP_UPDATER_ALLOW_DOWNGRADING, false) ||
                 update.getTimestamp() > SystemProperties.getLong(Constants.PROP_BUILD_DATE, 0));