"Building is painted" vs "Building has been painted"

[Sureshvemuri]

Building is painted - Building has been painted"Is there any difference between these two.
I see that -
Building is painted = Somebody has painted this building (may be this is telling the state of the building. It is a painted building. Is this right?).
Building has been painted = Somebody has painted this building.

I really don't understand and confused, why I have to use "Building is painted" OR "Building has been painted".

If there is no difference in the meaning why should I use two instead of one.
Not, from grammatic perspective, but Non-native speakers view, I mean the meaning of these two sentences.

Another eg:
Active: His hand is burnt
Passive: His hand has been burnt.

Both are same. No other person has burnt HIS hand. Here, why are we using has+been (His hand has been burnt.).

Can anyone tell me this.
Thanks,Suresh

[Mister Micawber]

.
We use the present perfect to emphasize the recent action:
The building has been painted/ his hand has been burnt-- don't touch it!

The building is painted / His hand is burnt-- These contain adjectives describing the condition of the building and the hand:
The building is painted-- bricks are not naturally purple.
His hand is burnt-- he did it last week at the barbecue.
_________________
Native English teacher at Mister Micawber's

[Sureshvemuri]

Thank you for your reply and time.