diff --git a/eng/helix/content/mssql/InstallSqlServerLocalDB.ps1 b/eng/helix/content/mssql/InstallSqlServerLocalDB.ps1
index f4c5995f70..5af8fc5dac 100644
--- a/eng/helix/content/mssql/InstallSqlServerLocalDB.ps1
+++ b/eng/helix/content/mssql/InstallSqlServerLocalDB.ps1
@@ -7,7 +7,9 @@
https://docs.microsoft.com/en-us/sql/database-engine/configure-windows/sql-server-2016-express-localdb?view=sql-server-2016
https://docs.microsoft.com/en-us/sql/database-engine/install-windows/install-sql-server-from-the-command-prompt?view=sql-server-2016
#>
-
+param(
+ [switch]$Force
+)
$ErrorActionPreference = 'Stop'
$ProgressPreference = 'SilentlyContinue' # Workaround PowerShell/PowerShell#2138
Set-StrictMode -Version 1
@@ -15,6 +17,11 @@ Set-StrictMode -Version 1
$intermedateDir = "$PSScriptRoot\obj"
mkdir $intermedateDir -ErrorAction Ignore | Out-Null
+if (-not $Force -and (Test-Path 'HKLM:\SOFTWARE\Microsoft\Microsoft SQL Server\RefCount\SqlLocalDB13')) {
+ Write-Host "SQL Server 2016 Express LocalDB is already installed. Exiting without action. Call this script again with -Force to run the installation anyways."
+ exit 0
+}
+
Write-Host "Installing SQL Server 2016 Express LocalDB" -f Magenta
# Download SqlLocalDB.msi.
diff --git a/eng/targets/Helix.Common.props b/eng/targets/Helix.Common.props
index 6f66e101d1..f4cd02ece0 100644
--- a/eng/targets/Helix.Common.props
+++ b/eng/targets/Helix.Common.props
@@ -33,8 +33,7 @@
-
-
+