When creating a website for a client, how much SEO related work will I be expected to do as standard?

It's obvious that SEO is important to every company that has a website, whether they are even aware of it or not. I was just wondering whether there is an "industry standard" in terms of how much SEO related work is generally expected from someone who designs/creates a website for a company that has NOT paid extra for any SEO-specific work.

If anyone could give some examples it would help me a lot,

Thanks!

What is a VPN?

VPN is (Virtual Private Network) were first used by companies to enable their employees to securely access internal systems such as email remotely (e.g. from home or while on business trips). Today they are increasingly being used for personal use by individuals to protect their privacy while online in public places (e.g. when using the wi-fi connection in a cafe) or in a country where the internet is censored / blocked (e.g. China, Saudi Arabia��).