When purchasing a property there are many things to consider – and each person approaches the decision differently. We typically look at many things before settling on a property including the location, the availability of good infrastructure, the society and the neighbourhood, the distance from work, good hospitals, schools and so on.  
At the end of all of this we come to how we will finance the property to answer the question: can we afford our dream house? This is where the 30-30-3 rule can come in handy. This thumb rule is meant to be a guide to help you understand if the house purchase you are about to make is stretching your finances too thin.