https://blogs.msdn.microsoft.com/virtual_pc_guy/2010/09/23/a-self-elevating-powershell-script/

# Get the ID and security principal of the current user account
$myWindowsID=[System.Security.Principal.WindowsIdentity]::GetCurrent()
$myWindowsPrincipal=new-object System.Security.Principal.WindowsPrincipal($myWindowsID) 
 
# Get the security principal for the Administrator role
$adminRole=[System.Security.Principal.WindowsBuiltInRole]::Administrator 
 
# Check to see if we are currently running "as Administrator"
if ($myWindowsPrincipal.IsInRole($adminRole))
   {
   # We are running "as Administrator" - so change the title and background color to indicate this
   $Host.UI.RawUI.WindowTitle = $myInvocation.MyCommand.Definition + "(Elevated)"
   $Host.UI.RawUI.BackgroundColor = "DarkBlue"
   clear-host
   }
else
   {
   # We are not running "as Administrator" - so relaunch as administrator
   # Create a new process object that starts PowerShell
   $newProcess = new-object System.Diagnostics.ProcessStartInfo "PowerShell";
   # Specify the current script path and name as a parameter
   $newProcess.Arguments = $myInvocation.MyCommand.Definition;
   # Indicate that the process should be elevated
   $newProcess.Verb = "runas"; 
 
   # Start the new process
   [System.Diagnostics.Process]::Start($newProcess);
   # Exit from the current, unelevated, process
   exit
   }
 
# Run your code that needs to be elevated here
 
Write-Host -NoNewLine "Press any key to continue..."
$null = $Host.UI.RawUI.ReadKey("NoEcho,IncludeKeyDown")