This will depend on your financial situation and how a lender assesses your borrowing capacity. Some may allow as little as 5% deposit, depending upon your income stability, credit history, and other factors.
If you borrow more than 80% of the property value, then you may need to pay mortgage insurance (or use a guarantor) in order to avoid extra cost. In certain cases like in guarantor backed loans, stamp duty or other costs might also be included. However, this depends on lender policies and local regulations.