most builders will not give you a set in stone handover date as there is a lot of variables but you can normally get a ball park once the slab is down but don't count on it , your building a house , not putting together something from ikea!
i have seen a house that went pretty far over the handover date (5 months) and we subsidized the clients rent while it was being finished but it was in the contract.
also i worked for Metrostyle/in-vogue for a couple of years , good builder with a good experienced team so you will be fine.
happy building.
