diff --git a/Ghidra/Framework/Project/src/main/java/ghidra/framework/project/extensions/ExtensionTableProvider.java b/Ghidra/Framework/Project/src/main/java/ghidra/framework/project/extensions/ExtensionTableProvider.java
index 43d5dc92fc..53f82fbf98 100644
--- a/Ghidra/Framework/Project/src/main/java/ghidra/framework/project/extensions/ExtensionTableProvider.java
+++ b/Ghidra/Framework/Project/src/main/java/ghidra/framework/project/extensions/ExtensionTableProvider.java
@@ -166,6 +166,18 @@ public class ExtensionTableProvider extends DialogComponentProvider {
 	private boolean installExtensions(List<File> files) {
 		boolean didInstall = false;
 		for (File file : files) {
+
+			// A sanity check for users that try to install an extension from a source folder
+			// instead of a fully built extension.
+			if (new File(file, "build.gradle").isFile()) {
+				Msg.showWarn(this, null, "Invalid Extension", "The selected extension folder " +
+					"contains a 'build.gradle' file.\nGhidra does not support installing " +
+					"extensions in source form.\nPlease build the extension and install its zip " +
+					"file.");
+				didInstall = false;
+				continue;
+			}
+
 			boolean success = ExtensionUtils.install(file);
 			didInstall |= success;
 		}
@@ -200,7 +212,7 @@ public class ExtensionTableProvider extends DialogComponentProvider {
 	}
 
 	/**
-	 * Filter for a {@link GhidraFileChooser} that restricts selection to those files that are 
+	 * Filter for a {@link GhidraFileChooser} that restricts selection to those files that are
 	 * Ghidra Extensions (zip files with an extension.properties file) or folders.
 	 */
 	private class ExtensionFileFilter implements GhidraFileFilter {
diff --git a/Ghidra/Framework/Project/src/main/java/ghidra/framework/project/extensions/ExtensionUtils.java b/Ghidra/Framework/Project/src/main/java/ghidra/framework/project/extensions/ExtensionUtils.java
index 0bedb9946c..e7d4c1e8e4 100644
--- a/Ghidra/Framework/Project/src/main/java/ghidra/framework/project/extensions/ExtensionUtils.java
+++ b/Ghidra/Framework/Project/src/main/java/ghidra/framework/project/extensions/ExtensionUtils.java
@@ -54,9 +54,9 @@ import utility.application.ApplicationLayout;
  * </ul>
  * 
  * <p>
- * Extensions may be installed/uninstalled by users at runtime, using the 
- * {@link ExtensionTableProvider}. Installation consists of unzipping the extension archive to an 
- * installation folder, currently <code>{ghidra user settings dir}/Extensions</code>. To uninstall, 
+ * Extensions may be installed/uninstalled by users at runtime, using the
+ * {@link ExtensionTableProvider}. Installation consists of unzipping the extension archive to an
+ * installation folder, currently <code>{ghidra user settings dir}/Extensions</code>. To uninstall,
  * the unpacked folder is simply removed.
  */
 public class ExtensionUtils {
@@ -71,7 +71,7 @@ public class ExtensionUtils {
 	private static final Logger log = LogManager.getLogger(ExtensionUtils.class);
 
 	/**
-	 * Performs extension maintenance.  This should be called at startup, before any plugins or 
+	 * Performs extension maintenance.  This should be called at startup, before any plugins or
 	 * extension points are loaded.
 	 */
 	public static void initializeExtensions() {
@@ -87,7 +87,7 @@ public class ExtensionUtils {
 
 	/**
 	 * Gets all known extensions that have not been marked for removal.
-	 *  
+	 * 
 	 * @return set of installed extensions
 	 */
 	public static Set<ExtensionDetails> getActiveInstalledExtensions() {
@@ -148,8 +148,8 @@ public class ExtensionUtils {
 
 	/**
 	 * Returns all archive extensions. These are all the extensions found in
-	 * {@link ApplicationLayout#getExtensionArchiveDir}.   This are added to an installation as 
-	 * part of the build processes.  
+	 * {@link ApplicationLayout#getExtensionArchiveDir}.   This are added to an installation as
+	 * part of the build processes.
 	 * <p>
 	 * Archived extensions may be zip files and directories.
 	 * 
@@ -221,7 +221,7 @@ public class ExtensionUtils {
 	}
 
 	/**
-	 * Installs the given extension file. This can be either an archive (zip) or a directory that 
+	 * Installs the given extension file. This can be either an archive (zip) or a directory that
 	 * contains an extension.properties file.
 	 * 
 	 * @param file the extension to install
@@ -515,10 +515,6 @@ public class ExtensionUtils {
 		if (file.isDirectory() && file.canRead()) {
 			File propertyFile = new File(file, PROPERTIES_FILE_NAME);
 			if (propertyFile.isFile()) {
-				if (new File(file, "build.gradle").isFile()) {
-					log.error("Extension source directories are not valid extensions");
-					return null;
-				}
 				return tryToLoadExtensionFromProperties(propertyFile);
 			}
 		}
@@ -580,7 +576,7 @@ public class ExtensionUtils {
 	 * Searching the child directories of a directory allows clients to pick an extension parent
 	 * directory that contains multiple extension directories.
 	 * 
-	 * @param installDir the directory that contains extension subdirectories 
+	 * @param installDir the directory that contains extension subdirectories
 	 * @return list of extension.properties files
 	 */
 	private static List<File> findExtensionPropertyFiles(File installDir) {
@@ -601,7 +597,7 @@ public class ExtensionUtils {
 	}
 
 	/**
-	 * Returns an extension.properties or extension.properties.uninstalled file if the given 
+	 * Returns an extension.properties or extension.properties.uninstalled file if the given
 	 * directory contains one.
 	 * 
 	 * @param dir the directory to search