I am going to get a mortgage with 1 year fixed rate.
But the property will not be available for another 8 months. Would I still get the same 1 year fixed rate when the property is available if I agree to mortgage.
The rate that you get will be the rate that is available when the property is ready - you can not prebook interest rates into the future. If you are not happy with the rate at the time of closing (or about 6 weeks before hand) you are free to shop around to see if a better deal is available from A N Other lender.