It may have been snug and "just right" to move out of a little house where you used to live when there were only the two of you. After a few years of life with a wife and developing children, purchasing a new home may be the best option. If you are resident in Melbourne and want to sell your property then you can look for milesre.
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Apart from the cramped size of your current home, the location may be another factor to consider: perhaps your current home is too distant from your place of employment, or too far from the hospital in case of an emergency, or perhaps there are better and more reputable schools in the next town for your children. These are just a few of the reasons why you should make such a significant change.
Make a note of these factors and use them as criteria for making your decision; this will ensure that you don't waste time looking at properties in places that don't meet your criterion for a new home. Then develop a detailed list of the steps you'll need to take.
The first step toward achieving this aim is to examine your budget for purchasing a new home. Because you've been an employee your entire career, it's extremely possible that you've only been able to save enough for a down payment; therefore, you'll need to either take out a bank loan or obtain owner financing.
Because you are a novice in this area, you may want to consult with a professional real estate broker to help you determine which option is the best for you. This will ensure that you do not become entangled in a project that will drain your savings over time, leaving you and your family penniless and homeless, and still without a home to call your own.