Formal:
* 您好，欢迎光临寒舍。 (Nín hǎo, huānyíng guānglín hán shě.) This is the most formal way to say it, using "寒舍" (hán shě) to refer to your home in a humble way.
Informal:
* 你好，欢迎来我家。 (Nǐ hǎo, huānyíng lái wǒ jiā.) This is a more casual and friendly way to say it, using "我家" (wǒ jiā) which simply means "my home."
More direct and friendly:
* 欢迎！ (Huānyíng!) This is a very common and friendly way to say "welcome" in Chinese, and is often used on its own.
You can also add "到家了" (dào jiā le) at the end of any of these phrases to mean "you've arrived home." For example:
* 您好，欢迎光临寒舍，到家了。 (Nín hǎo, huānyíng guānglín hán shě, dào jiā le.)
* 你好，欢迎来我家，到家了。 (Nǐ hǎo, huānyíng lái wǒ jiā, dào jiā le.)
The best way to say it depends on the situation and your relationship with the person you are greeting.