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How Adding a Granny Flat Investment to Your Wollongong Property Could Increase Value and Speed Up Mortgage Repayments - A Case Study

Explore a case study about your investment in a Wollongong Granny Flat, created by Matthew Howarth, the principal at Equiti Financial mortgage broking, that shows how it can increase its value, improve cash flow, and help pay your mortgage faster.


In this example scenario, we’ll show how adding a granny flat to an existing Wollongong property could bring significant financial benefits. While each property is unique, this case provides a general idea of how building a granny flat might increase cash flow, boost property value, and accelerate mortgage repayment.


Imagine a 3-bedroom, 1-bathroom house in Wollongong valued at $1,000,000 with a 50% loan-to-value ratio, meaning the homeowner has an outstanding mortgage of $500,000 at an interest rate of 5.5%. By investing $170,000 to build a 2-bedroom, 1-bathroom granny flat (please note the cost of a Wollongong Granny Flats is not fixed and fluctuates significantly per job, so this amount is purely for case study purposes), the homeowner could take advantage of Wollongong’s annual property growth rate of 7% and generate rental income of approximately $500 per week. The additional rental income could result in an annual positive cash flow of $13,472.

Financial case study of Wollongong Granny Flat
Table showing financial returns over time

In our example, the homeowner might use this extra income to make additional mortgage payments, potentially reducing their mortgage repayment period by up to 9 years. The increased property value from the granny flat and the consistent rental income could provide a substantial long-term financial benefit.

Table showing annual extra cashflow from Wollongong Granny Flat investment
Table showing annual extra cashflow from Wollongong Granny Flat investment

While these figures are based on hypothetical assumptions, the potential benefits are clear: higher property value, extra rental income, and the ability to pay a mortgage faster. This example illustrates how adding a granny flat could be a wise investment for many Wollongong homeowners, offering immediate financial benefits and long-term value growth.


Graph showing reduced mortgage period through extra cashflow from Wollongong Granny Flat investment
Graph showing reduced mortgage period through extra cashflow from Wollongong Granny Flat investment

While these figures are based on hypothetical assumptions, the potential benefits are clear: higher property value, extra rental income, and the ability to pay a mortgage faster. This example illustrates how adding a granny flat could be a wise investment for many Wollongong homeowners, offering immediate financial benefits and long-term value growth.


Key Assumptions:

  • $1,000,000 median price in Wollongong (3 bed 2 bath house)

  • 7% annual capital growth rate for Wollongong

  • $500 weekly rent on granny flat (2 bed 1 bath)

  • 5% annual rental growth rate

  • $170,000 build cost

  • 5.50% interest rate / 25 years remaining on loan

  • Not making any extra loan repayments

  • Currently owe 50% on the house mortgage

  • Borrow 100% of granny flat cost


This case study scenario highlights the potential financial impact of building a granny flat, showing how a well-planned addition could improve cash flow, property value, and mortgage management.


Would you like to speak to Matthew or one of our team?



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