A Piano will usually stay in tune if it is gently moved from one side of a room to another, but after a move such as in a van, the bumps and jolts will inevitably knock it out of tune to some degree. 

However, the biggest concern with moving any piano is the climate change from the room in which it has been situated, to the new room in which it will be going. Even if it is in the same house! But the further a piano travels, the more chance of a change in climate, which the piano will feel, and respond to. The whole soundboard will change shape slightly, therefore changing the tension on the strings. This will result in a 'settling-in' period, of a week or two, or maybe a few months, where the stability of the tuning may well suffer.

If we were to take, for instance, a piano which has just been tuned, from a Centrally-heated (dry heat) home, to a cool but humid home, it would probably sound fine immediately after the move. But within a few days, after adjusting to the higher humidity, and temperature variations,  it will start to sound quite out of tune.

If the piano hasn't got far to go though, and if it is treated gently, as long as the climate from one place to another is pretty similar, the tuning should not really suffer too much. All pianos need to be tuned regularly to keep an even and correct tension throughout the instrument, but they are quite hardy things, and moving should not bother a piano, if done correctly.

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