Why is the terrace higher than indoors?

There is something wrong with this and it is not normal. You need to ask the developer to correct it. It is normal for the balcony to be slightly lower. If it is not decorated, you can lay the indoor floor higher than the balcony floor when laying the floor. If it has been renovated, you can consider raising the area where the interior is in contact with the balcony. However, from the perspective of Feng Shui, the floor of the balcony should not be higher than the floor of the room. The ancients said that "the sky is clear and the earth is turbid", that is, the clear air rises and the turbid air falls. If the floor of the room is lower than the floor of the balcony, dirty air will easily pour in. Rooms pose a threat to people's health. Therefore, when building houses, Chinese people always raise the foundations and build high-rise buildings to occupy geomantic omens. So it is best to make some changes to form a high inside and low outside.