What is the value of Zakat that must be given on one thousand euros after a full year has passed, and is it permissible to give it in an Islamic country or in the country of residence, and is it valid to give it to a needy person to build a house?

The amount of zakat due on 1000 Euros is 25 Euros (2.5%). Zakat is given to the poor of the country where the money is located. It is permissible to transfer it to another country for a legitimate Shar'i interest, such as extreme need or kinship. As for giving zakat to someone who is building a house, the basic principle is not to buy a house for him from zakat, but rather to rent one, unless he owns land or has started building and his money is insufficient.