[lsiunsuex]

Random Wordpress website - 50-75% reuse - most generic sites are the same - upload a theme I've used in the past, change colors, some layout, images, etc... saves a lot of time to have a vetted baseline

Custom CMS - 100% reuse - always start with a rolling base and constantly improving it though WP sites have cut into this - people think WP is better - get what you pay for.

Random 1-offs - how many times I've had to build a newsletter system... Base system gets copied and installed with specifics changed - where to pull the email list from, mailgun or aws for sending, etc...

Server config could be considered "code reuse" - I'll almost always refer to another server I built or run myself to copy apache / php / whatever config sections as a starting point.