I usually start doing so and typically people say it's not necessary. I just say I do it in my own home and like to respect my clients' homes the same way.

I'll ask when greeted at the door if they would like me to remove my shoes...

Depends on the weather and the floor.

No.

However, if the pathway to the door included 7 inches of new snow, or the 4 inch Florida cloud burst, I would do so.

Nancy,

I do that at home, and what Nina Hollander said.  A

For some cultures yes..they expect it..I usually offer and if not necessary they will tell me.

No, unless I see all their shoes at the front door - then I'll ask if they want me to take off my shoes. 

If asked

I would ask the seller if he/she would like shoes off. 

It would depend on the weather, the season, the situation.  Never in the summer if I'm in sandals: I'm not walking barefoot in anyone's home but my own!

If you come to my house w shoes on, I will hire a shoeless agent.

Ditto to what Nina Hollander said.  However, I've been in a few homes I barely wanted to breathe, let alone remove my shoes.  

I do not, but certainly would if requested!

No

No, but I'm sure to wipe them good (assuming there's a mat upon my entrance) and I do ask if they would prefer they be removed (& if it's nasty out would just do it anyway).  I also make sure to notice what the homeowner is doing and take a cue from them....

Annette Lawrence , Palm Harbor, FL 727-420-4041 nailed this one!

A force of habit unless it is a rehab!

Nancy Robinson Ranked #111 by Real Trends/Wall Street Journal - oh yes, that is common courtesy for Indian families.

I never take my shoes off unless it is required.  Then I hope I'm not wearing my religious socks.  (Holy)

If needed.

I prefer those that do not require this.

I always ask if they woud like me to leave my shoes at the door.

Depends on the location and what is appropriate for the situation.

Usually take them off, especially if the home is clean and warm.

I do if it is wet, snowy or muddy or asked, but never in a REO

yes, unless it's a handyman special....

I ask.  

If I recall there were a couple of blog posts about this topic a couple of years ago with opposing viewpoints on this exact question. I'll have to look for them. -Kasey

Yes. Absolutely.  I carry a fresh pair of booties with me to cover my feet.

Yes sometimes, other times I ask permission to keep them on. I'm always freezing.

At the front door, unless a dirt floor

No.

For an appointment? only if asked

Not unless it is brought up.

Seems like I am very late to this question and you already have great answers 

If that is in the showing instructions.

I always offer first to remove my shoes.

Not unless requested.

Depends on the house. I do not mind removing my shoes and always make  a gesture to do so, unless they insist on keeping my shoes on. 

I ask them if they would like me to remove my shoes.  They always thank me for asking, whether or not they want me to.  It's a good way to start off on the right FOOT! 

It depends but normally I do

Not here in Phoenix - just not necessary with our tile and wood floors for the most part - and not much rain and no snow - lol

No, doctor's orders.  If needed I'll grab my booties from the car.  Plus, I wear boots.  The take forever to put on and off, so not a chance.

Not generally unless it's an asian family that is not wearing street shoes in the house.

Not generally unless my shoes are dirty/muddy and then I would leave them at the door.

I ask if I should. I never wear shoes at home and often am barefoot so it's not a big deal. But no barefootin' at a listing appointment

I survey the situation and act accordingly

I let the seller let me know

Nancy Robinson Ranked #111 by Real Trends/Wall Street Journal No unless the owner asks.