The down payment is only part of the budget.
Consider transaction costs, moving and the expenses that come with ownership. Costs vary with the property and your situation.
Separate what you can borrow from what works for you.
The amount you qualify for and the payment you feel comfortable with can differ. Your budget also needs to reflect your other goals and expenses.
Gather your information.
Prepare a picture of your income, debts and down payment. A first conversation helps identify the documents needed for your circumstances.
Leave some breathing room.
A property comes with maintenance and sometimes unexpected expenses. Discussing them early helps you build a more realistic budget.
Further reading
Financial Consumer Agency of Canada