If you manage more than one WordPress site you have probably wished there was a simpler way to handle updates, plugins and user management across all of them.

WordPress Multisite is that simpler way. It lets you run multiple WordPress sites from a single installation with a shared codebase and one admin dashboard to manage everything from.

Here is a complete guide to setting it up properly.

What WordPress Multisite Actually Is

Standard WordPress is a single site installation. One WordPress, one website.

Multisite turns that single installation into a network. One WordPress codebase can power hundreds of individual sites. Each site has its own content, its own admin area and its own domain. But they all share the same WordPress core files, the same themes and the same plugins.

Updates happen once at the network level and apply to every site. A plugin activated network-wide is available on all sites. For agencies managing multiple client sites or organisations running multiple regional versions of a website, it is a significant operational improvement.

Is Multisite Right for You?

Before setting it up be honest about whether it is actually the right tool for your situation.

Multisite works well when your sites have a lot in common. Same codebase, similar themes and similar plugin requirements. It becomes a headache when your sites are very different from each other. When one site has a problem it can affect the whole network. When a plugin update breaks something it breaks it everywhere.

If your sites are genuinely independent with different requirements, separate installations are often the better choice.

How to Set It Up

Step 1: Enable Multisite in wp-config.php

Add this line to your wp-config.php file above the line that says That’s all, stop editing.

define( ‘WP_ALLOW_MULTISITE’, true );

Save the file and reload your WordPress admin.

Step 2: Install the Network

Go to Tools in your WordPress admin. You will now see a Network Setup option. Click it.

You will be asked to choose between subdomains like site1.yourdomain.com or subdirectories like yourdomain.com/site1.

Subdomains require a wildcard DNS record. Subdirectories are simpler to set up. For most agency setups where sites will use their own custom domains the choice matters less because you will be mapping domains to each site regardless.

Enter your network title and admin email and click Install.

Step 3: Update wp-config.php and .htaccess

WordPress will give you two blocks of code to add. One goes in wp-config.php and one replaces your existing .htaccess content. Add them exactly as shown and save both files.

Step 4: Log Back In

After adding the code you will be logged out. Log back in and you will have a new Network Admin dashboard.

Step 5: Add Sites to Your Network

From Network Admin go to Sites and click Add New. Enter the address, title and admin email for each new site.

If you want sites to use custom domains rather than subdomains or subdirectories you will need a domain mapping plugin. Mercator is a solid free option.

Step 6: Manage Plugins and Themes at Network Level

From Network Admin you can install plugins and themes that are available to all sites on the network. You install once, update once and it is available everywhere. This is the main operational benefit of Multisite.

Things to Know Before You Commit

Not every WordPress plugin works properly with Multisite. Check plugin compatibility before building your network around a particular tool.

Multisite needs proper hosting. A shared hosting environment will struggle with a network of sites. A VPS or managed hosting is a much better fit.

Backups on Multisite require backing up a shared database that contains all your sites. Make sure your backup solution handles this correctly.

Moving a single site off a Multisite network later is more complex than migrating a standalone site. Plan for this before you commit to the architecture.

The Payoff

Once it is set up and running properly Multisite genuinely simplifies managing multiple WordPress sites. One update to WordPress core updates everything. New sites can be spun up in minutes with all the plugins and themes already in place.

For anyone managing five or more WordPress sites consistently it is worth the setup effort.

CodingBrackets builds and manages WordPress Multisite networks for agencies and organisations. If you want it set up properly from the start, get in touch.