More Brisbane families are choosing to keep everyone on the one block. Rather than move parents further away or watch adult children priced out of the market, they are adding a second, self-contained home beside the main house. It is a practical answer to intergenerational living, and it is a new build in its own right, not a renovation or an extension.

That distinction matters. A dual living home is not a spare room or a converted garage. It is a proper second dwelling with its own bedrooms, living area, kitchen and bathroom, built to give family their independence while keeping them close.

Why families are choosing dual living:

• Family stays close without living on top of each other.

• A real home, not a compromise, with its own entry, living space and privacy.

• Flexibility over time, as the space suits parents now and grown children or guests later.

What is a dual living home?

A dual living home is a second self-contained dwelling on the same block as your main house. In Brisbane, a smaller version, generally up to 80 square metres and within 20 metres of the main home, is what most people call a granny flat, or in planning terms a secondary dwelling. Go beyond those limits, or set the home up for a separate household, and it usually moves into dual occupancy territory, which is a different planning pathway.

The point for families is that this is a full home, not a bolt-on. It is built new, to the same standards as any dwelling, which is exactly why it works so well for parents or adult children who want their own front door.

Dual living versus a granny flat: what is the difference?

The line comes down to size, siting and who lives there. In Brisbane, a secondary dwelling up to 80 square metres (100 in rural areas) and within 20 metres of the main house is generally accepted development, which means it can often proceed without a planning application if it meets the relevant code. Build it larger, place it further away, or rent it to a separate household, and you move into dual occupancy, which typically needs a development application.

Queensland also changed the rules in 2022 so a secondary dwelling can now be rented to anyone, not only family. The planning detail sits with your council and can turn on your zone and overlays, so it is worth confirming early. The Queensland Government sets out the current position on secondary dwellings, and your block's specifics can be checked through Brisbane City Council's City Plan online.

Building a second dwelling close to your existing home

This is where a second dwelling has a real advantage over renovating or extending. When you build a separate new home on the block, your family keeps living safely in the existing house while the new one goes up. The work happens in its own fenced, separated zone, rather than opening up an occupied home with the dust, noise and safety risks that come with it.

That separation is something we plan around from the start: where site access and machinery go, how the build area is kept clear of the occupied home, and how the two dwellings connect once the new one is finished. It keeps everyday life running while the second home takes shape.

What Brisbane's rules mean for a second dwelling

Whether your dual living home is a secondary dwelling or a dual occupancy, a few things always apply. It needs building approval and a certifier, it has to meet the boundary setbacks and site cover limits for your lot, and if it will be rented to a separate household there can be extra fire and sound separation requirements. Overlays such as flood or biodiversity can add their own conditions.

None of this is a barrier. It just needs to be understood before the design is settled. Confirming your zone, overlays and the right pathway, secondary dwelling or dual occupancy, at the start saves reworking a plan later.

Is a dual living home right for your block?

It comes down to the block as much as the brief. Lot size, site cover, setbacks, where services run and how the two homes sit together all shape what is possible. On the right block, a dual living home adds genuine flexibility: a home for parents now, and a space for adult children or guests down the track. It is worth mapping those site realities early so the second home works for your family and your block.

Planning a dual living home in Brisbane

If you are weighing up a dual living home or second dwelling in Brisbane, we can help you understand what your block allows and shape a build that works for the whole family. Complete a free site feasibility check and we will look at the options with you.