diff --git a/lib/public/Teams/ITeamFolderProvider.php b/lib/public/Teams/ITeamFolderProvider.php
index 58b1b6f19ca41..4eb33fe33d819 100644
--- a/lib/public/Teams/ITeamFolderProvider.php
+++ b/lib/public/Teams/ITeamFolderProvider.php
@@ -39,6 +39,16 @@ public function getTeamFolder(string $teamId): ?TeamFolder;
 	 */
 	public function createTeamFolder(Team $team, int $quota = 0): TeamFolder;
 
+	/**
+	 * Update the storage quota of the team folder.
+	 *
+	 * @param string $teamId The team single id.
+	 * @param int $quota Quota in bytes; zero means unlimited.
+	 * @return TeamFolder The updated folder.
+	 * @since 35.0.0
+	 */
+	public function updateTeamFolderQuota(string $teamId, int $quota): TeamFolder;
+
 	/**
 	 * Remove the exclusive relationship but retain the folder and its contents.
 	 *
diff --git a/lib/public/Teams/TeamFolder.php b/lib/public/Teams/TeamFolder.php
index 0d87a11b46f36..7a5c0858294f7 100644
--- a/lib/public/Teams/TeamFolder.php
+++ b/lib/public/Teams/TeamFolder.php
@@ -24,6 +24,7 @@ class TeamFolder implements \JsonSerializable {
 	public function __construct(
 		private int $id,
 		private string $mountPoint,
+		private ?int $quota = null,
 	) {
 	}
 
@@ -42,13 +43,24 @@ public function getMountPoint(): string {
 	}
 
 	/**
-	 * @return array{id: int, mountPoint: string}
+	 * The storage quota in bytes, zero for unlimited, or null if the active
+	 * provider does not expose a quota for this folder.
+	 *
+	 * @since 35.0.0
+	 */
+	public function getQuota(): ?int {
+		return $this->quota;
+	}
+
+	/**
+	 * @return array{id: int, mountPoint: string, quota: int|null}
 	 * @since 35.0.0
 	 */
 	#[\Override]
 	public function jsonSerialize(): array {
 		return [
 			'id' => $this->id,
+			'quota' => $this->quota,
 			'mountPoint' => $this->mountPoint,
 		];
 	}
diff --git a/tests/lib/Teams/TeamFolderTest.php b/tests/lib/Teams/TeamFolderTest.php
index 0b5397dbf224e..bc062b98d61e2 100644
--- a/tests/lib/Teams/TeamFolderTest.php
+++ b/tests/lib/Teams/TeamFolderTest.php
@@ -18,6 +18,14 @@ public function testSerializesFolderIdentity(): void {
 
 		$this->assertSame(42, $folder->getId());
 		$this->assertSame('Engineering', $folder->getMountPoint());
-		$this->assertSame(['id' => 42, 'mountPoint' => 'Engineering'], $folder->jsonSerialize());
+		$this->assertNull($folder->getQuota());
+		$this->assertSame(['id' => 42, 'quota' => null, 'mountPoint' => 'Engineering'], $folder->jsonSerialize());
+	}
+
+	public function testSerializesFolderQuota(): void {
+		$folder = new TeamFolder(42, 'Engineering', 1024);
+
+		$this->assertSame(1024, $folder->getQuota());
+		$this->assertSame(['id' => 42, 'quota' => 1024, 'mountPoint' => 'Engineering'], $folder->jsonSerialize());
 	}
 }