Issue 435: There are six conditions for the place where one offers their prayers:

1- It must be Mubah (not usurped). So, one who offers their prayers in a usurped place, even if it is on a carpet, a bed etc., their prayers will be void. However, offering prayers under a usurped ceiling or in a usurped tent is not forbidden.

Issue 436: Prayers offered in a place whose benefits belong to a person who has not consented to the use of their property, is void. For example, in a rented house, the prayers of the owner of the house or anyone else without the permission of the tenant is void, and so is the prayers of a person in a place where someone else has a legal right. For example, if a dead person has stated in his will to spend one-third of their property on a special purpose, it is not allowable to offer prayers on their property, as long as they have not executed their will.

2- It must be motionless and not moving. For example, it cannot be a car.

3- It must not be cramped. Nor must the ceiling be too low so that one can stand, bow, and prostrate properly.

4- The point where they place their forehead in prostration must be pure.

5- If the place is pure, it must not be so wet that the wetness would reach their body or clothes.

6- The point where they place their forehead in prostration must not be lower or higher than four attached fingers, compared to the place where they put their knees, and as an obligatory precaution, compared to the place where they put the tips of their big toes. However, it does not matter if the ground slopes slightly.