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I would like to use PowerShell to add a specific user to the local administrator group on a machine. I would be running the PowerShell script in the context of a user that has Administration rights on the local machine.

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See also [Windows Local Account and Group Maintenance][1]. [1]:… – Nathan Hartley Feb 24 '11 at 17:19
up vote 4 down vote accepted

This is the Advanced Function That I use to add a users to the local Administrator group using Powershell on several computers.

Usage: Get-Content C:\Computers.txt | Set-LocalAdminGroupMembership -Account 'YourAccount'

Function Global:Set-LocalAdminGroupMembership



    .Parameter $ComputerName,

     PS> Set-LocalAdminGroupMembership -ComputerName $ComputerName -Account 'YourAccount'


     NAME:      Set-LocalAdminGroupMembership
     LASTEDIT:  2/4/2010 2:30:05 PM
     #Requires -Version 2.0

    [Parameter(Position=0, ValueFromPipeline=$true)]
    $ComputerName = '.',
    [Parameter(Position=1, Mandatory=$true)]


        if($ComputerName -eq '.'){$ComputerName = (get-WmiObject win32_computersystem).Name}    
        $ComputerName = $ComputerName.ToUpper()

        $Domain = $env:USERDNSDOMAIN

            $adsi = [ADSI]"WinNT://$ComputerName/administrators,group"
            Write-Host "Not connected to a domain." -foregroundcolor "red"

    }# Process

}# Set-LocalAdminGroupMembership
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Here is a simple 2 line script that performs this function

$group = [ADSI]("WinNT://"+$env:COMPUTERNAME+"/administrators,group")

For more information see Hey, Scripting Guy! How Can I Use Windows PowerShell to Add a Domain User to a Local Group?

So there are a couple of notes. In the first line I used string concatonation, I didn't have to (see the next line) but i like to because it helps accentuate the variables I am using. Second, these lines will add a domain user ,if you wanted to add a local user just remove $env:USERDOMAIN/

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I would like to run this script on workstations in such a way that the person running the script can type in a username. Hence the Read-Host – Rihan Meij Mar 9 '10 at 8:09
so in that case make the first line $userInput = Read-Host "Enter username to add to the local admin group" then use $userinput where is says usernameiwantoadd – Jim B Mar 9 '10 at 14:27

Here is another way to do this. Needs to be run in Administrator context:

$computername= "$env:computername"

function AddToGroup($number)
     $group.add("WinNT://"+$domain+"/"+$number )

#Add these domain users/groups to the local administrator group
 AddToGroup ""
 AddToGroup ""

#Add these domain computer accounts to the local administrator group. 
#Computer accounts always end with $.
AddToGroup "$"

More info here:

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On Server 2016 and later you can use the new PowerShell local user cmdlets:

Add-LocalGroupMember -Group Administrators -Member username

This was added in TP5 and may become available in later versions of Windows 10.

The Microsoft.PowerShell.LocalAccounts module works fine on 2012 R2.

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