Knock-Down Rebuild
Builder Sydney

Renovating an existing home preserves some value and avoids alternative accommodation costs. But many Sydney homes, particularly fibro and brick veneer homes built between 1950 and 1985, are not worth renovating. The structure is tired, the layout is wrong for how you want to live, and the cost of making an old home perform well thermally is often greater than the cost of starting fresh.

A knock-down rebuild makes sense when the existing home has little or no heritage value, the block is well located, and you want a home that performs well for the next 50 years. The land is the asset. What is sitting on it is often the problem.

The critical question is whether the block is heritage-affected. In Sydney, heritage overlays can significantly change what is possible and which approval pathway applies. We check this before we do anything else.

Sydney has a large number of Heritage Conservation Areas (HCAs) and Heritage Items spread across inner and middle ring suburbs. An HCA does not necessarily prevent demolition, but it requires a DA (not a CDC), a heritage impact statement, and often consultation with council's heritage officer. A Heritage Item listing is more restrictive and may prevent demolition of the primary structure entirely.

Mo Amin checks heritage status, zoning, and planning constraints as part of his initial site assessment. This takes a few days and can save months of design work on a project that turns out not to be feasible as a KDR. We do not start design until the site investigation is complete.

A Complying Development Certificate (CDC) is available for new dwellings on sites that meet the standards in the Housing SEPP. CDC approval is issued by a private certifier and does not require public notification. It typically takes 20 to 30 days. It is the faster and more predictable pathway when available.

A Development Application (DA) is required when the site is heritage-affected, when the proposed development does not meet CDC standards (setbacks, height, FSR), or when the council has specific restrictions. DA timeframes vary significantly by council and by the complexity of the proposal. Applications are lodged through the NSW Planning Portal. We have managed DA processes with Inner West Council, Woollahra Council, and Willoughby Council, among others.

Demolition in Sydney typically takes two to four weeks once approvals are in place. Utility disconnections (electricity, gas, water, sewer) need to be arranged in advance and can take four to six weeks to organise with the relevant providers. We manage the disconnection schedule as part of the project programme.

Pre-1990 homes almost always contain some asbestos, typically in fibro sheeting, eaves lining, or floor materials. A pre-demolition asbestos survey identifies the quantity and type before we get a demolition quote. Asbestos removal adds cost and time to the demolition phase, but is not unusual for a Sydney KDR. We factor it into the budget at the feasibility stage so there are no surprises.

A knock-down rebuild is the cleanest opportunity to build a passive house. You have a fresh slab, no existing structure to work around, and full control over orientation, insulation, and window placement from day one. The thermal envelope can be designed without compromise. Ibrahim Amin designs the passive house details from the ground up on every KDR we take on.

The result is a home that sits at 22 degrees year-round, uses approximately 80% less energy than a standard new build, and needs far less heating and cooling than a standard new build. Investing in a properly designed passive house envelope rather than oversized mechanical systems is a straightforward long-term decision.