Many factors determine the final price of a duplex construction project. Architects, location, materials and land costs all heavily contribute. The average cost to build a duplex in Australia (excluding land costs) ranges between $550,000 and $1.3 million.
Costs in Australia
City | Average Reported Costs |
Sydney | $600,000 – $1.2 million |
Melbourne | $650,000 – $1 million |
Canberra | $550,000 – $1.1 million |
Strong Value Growth – Duplexes are stable investments. They can produce strong value growth with high rental yields over time, allowing you to earn more money compared to detached residential properties.
Great for Beginners – Those who are looking to increase their net worth by investing in real estate can start by building a duplex. The cost of building a duplex is significantly lower compared to a house, which makes it less of a risk. Over time, the duplex can increase in value and can be sold for more than what it cost to build it, allowing the owner to earn a profit.
Low Maintenance Costs – Due to the smaller size of duplexes, they often come with low maintenance costs. Some duplexes also don’t have yards or more modest exteriors, which means less money invested in the landscaping. They can also be easier to own for retirees or couples without children. The cost of the utilities each month are also more affordable due to the smaller size of the duplex.
Affordable – Those who want to own a home but are on a tight budget can build a duplex as a more affordable option compared to building a house. Duplexes cost less compared to houses due to their smaller size. Many people who want to live closer to the city also choose to build a duplex. It provides them with the opportunity to afford a property in a specific location due to the lower cost. It also allows many people to be on the fast track to buying a home.
Rent Out the Duplex – Duplexes are great investments because they can be rented out to a tenant or family member. The earnings can supplement the owner’s income. They can also be used to pay off the mortgage as the property increases in value and is sold for a higher amount in the coming years.
Site size – The amount of land purchased to build the duplex influences the cost, as does the location of the property. The demand for land in the area will affect the value and the price to build a duplex.
Architects & Contractors – The types of architects and contractors who are hired affects the price of duplex homes with their rates and what they charge. Architects and contractors with a higher skill level and more experience in the industry often charge more, which can increase the duplex house cost.
Location – The location of the site where the duplex is built is the main factor that determines the final price. Demo
Materials – The types of materials used to construct the building will significantly influence the duplex price. Everything from the materials used on the frame to the materials installed for the countertops will determine the duplex cost.
Demolition costs depend on the size of the building and where it’s located. A standard knock down or demolition will cost between $10,000 and $30,000. As mentioned, the cost to build a duplex varies between $550,000 and $1.3 million. Factoring in these costs, the knock down rebuild duplex cost will vary between $560,000 and $1.33 million. Some of the materials that are torn down can be recycled, allowing the owner of the land to recoup some of their costs before building a new duplex. Recycling the materials are often considered to be tax-deductible donations and can make it easier to discard the remains of the old building quickly.
Ask Family Members and Friends for Referrals
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Narrow Down Your Top Three Choices
Interview the Builder
Licencing and Qualifications
How to Save Money Hiring a Duplex Builder
* The cost data is based on Oneflare and third-party sources