Many first time buyers make the mistakes of under budgeting to purchase their house. There are other costs involved when you sign the Sales and Purchase Agreement : besides the 10% of the house value, you need to pay the other costs such as lawyer fee, stamp duty and disbursements for both the Sales and Purchase Agreement and Loan Documentation, mortgage and fire insurance, and valuation report.
Sometimes, the developer's representatives do not make it known, they assume the house buyers know it or have extra money to pay for it. While there are many who have more than 10% of the house value that they purchase, there are many more who have just barely enough to buy it, but still buy it for the fact that it's a shelter over the head.
It's advisable that the house buyers ask for the list of cost of purchase, direct and indirect one, from the developers' representatives who handle the house purchase and related documentation. With this data, you can plan for it. As a rule of thumb, you should set aside 5% of the house value for this part of the cost of purchase.
