For web design, I usually do this: Let's say the site design has been approved, and the buildout is underway, and the client says: "Oh yeah I want to add a blo

For web design, I usually do this: Let's say the site design has been approved, and the buildout is underway, and the client says: "Oh yeah I want to add a blog!" I'll tell the client: "Not a problem...once the site is built out to the specifications in the original contract, we can give you a custom quote for the blog." I can add a Wordpress blog in 5 minutes, and adapt the existing design into a custom theme in about 10 minutes, but the client doesn't need to know that. Putting the additional tasks in a quote with a value attached to it not only cuts down on the number of additional requests, it helps the client realize the value of your time and effort.