Duplex vs House for Investment: Which Is Better?

Traditionally, standalone houses have been the ideal investment. However, as demand for housing increases across Australia, duplexes have become a viable and lucrative alternative. 

A duplex (or dual-occupancy dwelling) is a property consisting of two separate dwellings that share a roof, wall, and more often than not, a driveway. As an investment, a duplex property offers significant differences (and potential benefits) over a standalone or existing house. 

Comparing Duplexes vs Houses for Investment

Upfront Cost

Building a duplex comes with a higher upfront cost than building a standalone house. Each separate dwelling in a duplex requires its own set of amenities, which naturally adds to construction and fitting costs.

The average cost to build a house in Cairns is $2,500 per square metre - taking the average size of 240 square metres for a house, the average build cost for a standalone house is $600,000. The average cost of building a duplex in Cairns is $3,500 per square metre - meaning a property of the same size would cost around $840,000. 

Note: These costs are purely estimates based on average construction costs.

Rental Yield

When it comes to rental yield, duplex properties generally have the upper hand over standalone houses. Both units in a duplex can be rented individually, effectively doubling the potential rental income investors can receive compared to a single house.

Market trends across Australia show that units (including duplexes) outperform houses in rental yield. In Cairns, for instance, units have a 6.24% rental yield compared to 4.78% for houses (December 2025, Real Estate Investar).

Rental Demand

Duplex properties have shared walls, resulting in less privacy for tenants. With privacy being a deciding factor for many tenants, duplex dwellings can come with a lower rental appeal, particularly among those who value space. 

Standalone houses offer complete privacy for tenants, increasing rental appeal for tenant demographics like families. 

Flexibility of Use

Duplex properties offer investors the flexibility of using one dwelling as a private residence while leasing out the other to rent.

Standalone properties do not provide investors with the same flexibility of use - the property must either be used as a residence or leased for rent.

Body Corporate Implications

Duplex properties may be subject to body corporate regulations, particularly if dwellings share common spaces or are physically joined. 

Unlike other strata-titled arrangements, duplex owners do not need to attend formal meetings, engage property managers, or pay levies. Costs for maintenance and building insurance of any shared areas, like a driveway or the roof, will still be shared between co-owners. The only downside of this factor is the added complication that investors have to face for ownership.

A standalone house is a simpler option for investors who want to be less involved in the management of the property.

Resale Potential

As with renting, each unit of the property can be sold separately - this allows investors to keep part of the property for personal use while reaping the capital gains accrued over a long period of ownership.

A standalone house has limited options for subdivision to sell part of the property, and doing so will typically incur high renovation costs to create separate units in the building. 

Both duplexes and standalone houses can be a lucrative investment - it comes down to each investor’s goals and available capital. Looking to invest in North Queensland? Cougar Homes is the region’s trusted builder for premium quality homes. Browse our range of home designs in Cairns - we have designs to meet every layout and budget, as well as house and land packages for investors who want a cost-effective option.