Before VP, only got lot number. You will know your house number when you get the key. But you can try to guess the house number by counting the unit in the specific road.

My lot was 134 but my house number is 43. Lot usually got from 1 to xxx number of houses in the housing area. House number is usually by the road (eg: road 1, no 1-40, road 2, no 1-50).