Knockdown Rebuild in Brisbane

In Brisbane this is not a formality. If the house was built before 1947 and sits in a character area or a Demolition Control Precinct under Brisbane City Plan, demolition is restricted and approval is far from guaranteed. Councils protect pre-war streetscapes seriously, and the assessment looks at whether the building contributes to the character of the street.

Before you plan anything, we pull the council property report and check the overlays. If demolition is restricted, the conversation shifts to what is usually a better project anyway — raising the existing house, building in underneath, and adding a rear extension.

Finding this out at the start costs nothing. Finding it out after you have paid for design and a demolition quote is an expensive way to learn.

Demolition is more than a machine and a skip. Service disconnections for power, water, sewer and gas have to be arranged and certified. Asbestos is likely in anything built before the late 1980s and requires licensed removal and disposal with documentation. Any protected vegetation on the site adds another approval layer.

Site conditions drive the cost as much as the building does. A tight inner-suburban block with no side access, overhead powerlines and neighbours a metre away is a different job to a flat suburban lot with a wide driveway.

We price demolition as a defined scope with the asbestos position established up front, rather than as a provisional sum that quietly grows.

The advantage of a rebuild over a greenfield build is that the services are already there and the neighbourhood is established. The disadvantage is that everything else is constrained — access, storage, neighbouring structures, mature trees, and existing levels that may not suit a modern slab.

Soil is the item most people underestimate. Much of Brisbane sits on reactive clay, and a site classified H1 or H2 under AS 2870 requires an engineered footing system considerably more expensive than a standard slab. An old house sitting happily on stumps tells you nothing about what a slab will need.

We get the soil test and the survey done before design so the footing system, the retaining and the levels are in the budget from the first number you see.

The honest test is structural. If the existing frame, roof and foundations are sound and the layout can be reworked without moving everything, renovation usually wins on cost per square metre. If you are moving the kitchen, the bathrooms, the stairs and the external walls, you are paying rebuild prices for a compromised result.

The other factor is compliance. A rebuild delivers a house built to current standards throughout — including the energy efficiency provisions now applying to new homes in Queensland — while a renovation only brings the touched parts up to current requirements.

We give clients a straight comparison on both paths, including the cases where we recommend renovating and therefore doing less work. That is a better outcome for you and a better reference for us.