What a Knockdown-Rebuild Really Costs in Boroondara

When people ask what a knockdown-rebuild costs in Boroondara, they usually mean the demolition. But demolition is one of the smaller lines in the project. Understanding where the money actually goes stops the rebuild budget from blowing out in the parts nobody quotes upfront.

Here is the full picture for a Balwyn, Kew or Canterbury knockdown-rebuild.

The headline: demolition is a small slice

For a standard detached Boroondara home, demolition generally runs $18,000 to $40,000, higher for double-storey or full-brick houses, difficult access or significant asbestos. Against a total knockdown-rebuild that commonly lands between $600,000 and well over $1,000,000 in this part of Melbourne, demolition is a single-digit percentage of the job.

That matters because owners often shop hard on the demolition number and then get surprised by the lines that dwarf it.

Where the money actually goes

The rebuild itself

The new home is the overwhelming share. In Boroondara, land values and buyer expectations push builds toward the premium end, and custom designs on established blocks cost more per square metre than volume-builder product on a greenfield estate. This is the line to get right first.

Approvals and design

Architect or building designer fees, engineering, energy rating, soil tests, a land survey and building permit fees add up well before a wall goes up. In a Heritage Overlay — which covers pockets of Kew and Canterbury — you may also need a planning permit before demolition is even approved, which adds time and professional cost.

Site and service works

This is the quiet budget-killer. Service abolishment and new connections, a new crossover if the council requires it, site cuts on a sloping block, retaining, and stormwater works are frequently underestimated or left out of early numbers entirely. On an established Boroondara block they can be substantial.

Demolition and asbestos

Covered above — modest against the whole, but sensitive to asbestos, concrete volume, pools and access. A pool that has to be removed and the void backfilled and compacted is a real job in itself.

The costs that catch Boroondara owners out

The unpleasant surprises almost always come from the same short list:

Asbestos that was never assessed before the quote.

Site and service works excluded from early estimates.

Heritage requirements discovered late — an overlay can force a planning permit or a retained facade.

Driveways, paths and old footings left out of the demolition scope.

Council crossover and asset-protection conditions.

None of these are exotic. They are simply the lines that a low headline quote leaves out to look competitive.

How to build a number you can trust

Sequence the pricing so the big unknowns surface early:

1. Settle the rebuild design and builder — that anchors the largest number. 2. Get a demolition inspection and fixed price, with asbestos assessed and exclusions written down. 3. Price the site and service works properly, not as a placeholder. 4. Check the planning position — overlays especially — before you commit, while changes are still cheap.

The bottom line

A Boroondara knockdown-rebuild is not a demolition bill with a house attached — it is a rebuild with demolition as one early, manageable line. Get the demolition inspected and fixed-priced early so it stops being a variable, put real numbers against site and service works, and confirm your planning position before you sign. Do that and the total holds; skip it and the surprises all land after you are committed.