clinets asking wheres your office?

It's actually something to brag about that you can work from anywhere and you don't necessarily need an office.
If you have to meet them, go to them yourself, or if they insist they come by arrange to them somewhere decent, someone mentioned a coffee shop or hotel.

It doesn't make it less professional depending on how you look at it/ present yourself. They would actually wish they had the same privilege as you do, instead of waking up to go to a 9-5 job everyday.

Having no office is not a shameful thing. You are the office in your self.

I run my engineering company from home. I am trying really hard to not get an office. Its been three years and clients are fine with it. Its nice being able to work while out of the country too. I type this while in the bath tub sending emails out and answering calls.

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Tell them you would have to kill them if they ever found out where your Bat Cave was!