WordPress maintenance costs can vary greatly depending on the specific needs of your site and whether you're handling the maintenance yourself or hiring a professional. If you're hiring a professional, you might pay anywhere from $50 to over $200 per month for a maintenance plan, which typically includes updates to WordPress core, themes, and plugins, regular backups, security checks, and sometimes small content updates or fixes. If you have a larger or more complex site, you might pay more for a premium plan that includes faster support response times, uptime monitoring, SEO services, or other advanced features. On top of this, you'll need to consider costs for your domain name, hosting, premium themes or plugins, and potentially other services like email or e-commerce tools.