Knockdown Rebuild in Melbourne: What It Really Costs, Start to Finish (2026)

You love the street. You love the block. The schools are right, the neighbours are good, and you've spent years imagining what the house could be. It's the house itself that's let you down — the wrong layout, the cold rooms, the renovation list that never gets shorter.

So you've started looking into a knockdown rebuild. And the first thing you want to know isn't the philosophy of it. It's the number. What is this actually going to cost me?

This guide answers that honestly. Not a marketing range designed to get you in the door — the real breakdown, including the costs most builders don't mention until you've already signed. We build knockdown rebuilds across Melbourne's southeast, and we'd rather you walked into this with your eyes open. A well-informed client is a better client to build for.

The short answer

A knockdown rebuild in Melbourne in 2026 typically lands between $400,000 and $1.5 million-plus, all in — demolition, site preparation, and the new home together.

That range is wide because a knockdown rebuild is really two projects stacked on top of each other: getting the old house off the block, and building the new one on it. Where you land depends on your block, your home's size and finish, and how many surprises are hiding under the old slab. Here's how that number actually breaks down.

The full cost breakdown

For a family building a considered, quality home in the $800,000–$950,000 construction range — which is where most of our clients sit — the total project figure, once you add demolition, site costs and the extras above, usually lands between $950,000 and $1.15 million.

Demolition: getting the old house off the block

Demolishing a standard three-bedroom Melbourne home costs $15,000 to $35,000 in 2026. A double-storey or full-brick home pushes toward $40,000. Most demolition jobs — from the first inspection to a fully cleared, ready-to-build block — take three to eight weeks.

The biggest variable is asbestos. Almost any home built before 1990 contains asbestos somewhere — eaves, cladding, fencing, old floor coverings. It has to be removed by a licensed asbestos removalist and disposed of under WorkSafe Victoria's rules, and it adds $2,500 to $15,000 to the demolition, depending on how much is there.

This is the first place an honest builder earns their keep. Anyone quoting you a firm demolition price before they've assessed the house for asbestos is guessing — and a guess that turns into a variation is exactly the kind of moving number that keeps people up at night.

Site costs: the number no one leads with

Site costs are what it takes to prepare your specific block for construction — and they vary more than any other line item. On a flat, straightforward suburban block with good access, you might spend $15,000. On a sloped, tight, or complicated site, it can climb past $80,000. What moves it:

Soil type. Reactive clay soils are common across Melbourne's southeast, and they demand more substantial footings. Your soil report — done before you commit to a design — tells you what you're dealing with.

Slope. More fall across the block means more excavation, retaining, and a more engineered slab.

Access. Narrow frontages, rear-only access, or a block hemmed in by neighbours makes it harder and slower to get machinery and materials in.

Service connections. Water, sewer, power, gas and stormwater all need connecting. If they have to travel a long way to reach your block, the cost adds up.

The new build: what you're actually paying per square metre

Once the block is clear, you're building. Custom home construction in Melbourne in 2026 runs $2,200–$3,400/m² for a practical, well-built home working within constraints; $3,400–$5,200/m² for most quality custom builds with real design and considered inclusions; and $5,200/m²+ for architect-led homes with premium materials and complex forms.

For a 250m² family home in that middle band, you're looking at roughly $850,000 to $1.3 million in construction alone, before the demolition and site costs above.

We've written a full breakdown of what drives the build price — and what $850,000 actually buys — in our guide to what it costs to build a house in Melbourne. The one-line version: the single biggest lever on your final number is what you specify. Kitchens, bathrooms and floors are where budgets rise or hold.

How long does a knockdown rebuild take?

Plan for 12 to 24 months from your first serious conversation to holding the keys. Roughly: design and documentation takes 2 to 4 months; council approvals and permits 3 to 4 months (the stage people underestimate); demolition and site clearing 1 to 3 weeks; and construction 8 to 12 months, depending on size and complexity.

The approvals stage is the one that surprises people. It feels like nothing is happening, but permits, engineering, and council requirements are all moving in the background. A builder who's done this before manages that stretch so you're not chasing it yourself.

And yes — you'll need somewhere to live while it happens. Most Melbourne families spend $8,000 to $25,000 on rent across the build. Worth budgeting from day one, not discovering halfway through.

Knockdown rebuild vs renovate vs move

Three honest questions to ask before you commit to knocking down.

Could you renovate instead? Sometimes. But homes built before the 1980s often carry structural, wiring and plumbing issues that make a big renovation cost more than a new build — and you're still left with an old house wearing a new jacket. If your renovation wish-list is long, a knockdown rebuild frequently works out better value per dollar and gives you a home with no compromises baked in.

Could you just move? You could. But you'd pay stamp duty (often $40,000–$50,000+ on a Melbourne home), agent fees, and moving costs — and you'd be competing for someone else's house in a tight market, in a suburb that may not be the one you already love. A knockdown rebuild keeps you on the block you chose, near the schools and people you know.

Is your land worth building on? This is the one to confirm early. In established southeast suburbs, most residential blocks are well-suited to a new build — but overlays, easements and zoning can affect what's possible. It's a quick thing to check before you fall in love with a floor plan.

If you own land in a suburb you don't want to leave, and your current home fights you more than it serves you, a knockdown rebuild is usually the most direct path to the home you've been putting off.

Protecting yourself from the blowout

The fear underneath every knockdown rebuild question is the same one: I'll commit to a number, and then watch it move. Everyone's heard the story — the friend locked into $120,000 of variations, the "fixed" price that turned out to be anything but. Here's how to protect yourself, whoever you build with.

Get your reports done before you sign. A soil report and site assessment turn guesses into real numbers. Budget from those numbers, not from an optimistic quote.

Ask what's not included. This is the single most useful question you can ask a builder. Site costs, demolition, landscaping, driveways, fencing, appliances, window furnishings — get a clear answer in writing. A builder who won't give you one is telling you something.

Understand the allowances. A lot of blowouts aren't dishonesty — they're allowances set too low. If the contract allows $8,000 for a kitchen you'll actually spend $30,000 on, the difference isn't a surprise, it's a certainty. Pressure-test the allowances early.

Choose a builder who'll be in the room. With a boutique builder, the person quoting your job is usually the person running it. Fewer homes on the book means more accountability when something needs to change — and more of the direct, honest communication that makes a build feel manageable instead of frightening. It's why we work the way we do — you can see the whole approach on our process page.

Knockdown rebuilds across SE Bayside Melbourne

We build in the established suburbs of Melbourne's southeast bayside corridor — the areas where the land has held its value but a lot of the housing stock hasn't kept pace. Bonbeach, Edithvale, Chelsea, Aspendale, Mordialloc, Moorabbin, Highett and across the Frankston line: streets where families have lived for years and the block is worth staying on.

We're currently in the early stages of a knockdown rebuild in Moorabbin — one of the area's most tightly held pockets. The old home comes down shortly to make way for an energy-efficient family home built for the next stage of life. We're documenting the whole journey, so if you want to see what the process actually looks like from the ground up, it's worth following along. You can see more of our work over on our projects page.

Common questions

How much does it cost to knock down and rebuild a house in Melbourne?
In 2026, a knockdown rebuild in Melbourne typically costs between $400,000 and $1.5 million-plus all in — demolition, site costs and the new home together. For a quality custom family home in Melbourne's southeast, most projects land between $950,000 and $1.15 million once demolition, site costs, permits and temporary accommodation are included.

Do I need to move out during a knockdown rebuild?
Yes. Once demolition starts, the block is a construction site for the duration. Most families rent nearby and plan for it in advance — budget $8,000–$25,000 across the build.

Can I stay in my suburb?
That's the whole point. A knockdown rebuild keeps you on your existing block — same street, same schools, same community — with a brand-new home designed around how you actually live.

Is a knockdown rebuild cheaper than renovating?
Often, for older homes. Large renovations of pre-1980s houses can cost more than a new build once you account for hidden structural and services work — and you still end up with an old home. A knockdown rebuild gives you a home with no compromises.

What's the cheapest a knockdown rebuild can realistically be?
Around $400,000 at the very bottom for a small, simple home on an easy block with no asbestos. For a quality custom family home in SE Melbourne, plan closer to $950,000–$1.15 million all in.

Talk it through with Tim

If you're weighing up a knockdown rebuild, the most useful thing you can do is have an honest conversation before you commit to anything. Tim will look at your block, your brief and your budget and tell you plainly what's realistic — including whether a knockdown rebuild is even the right move for you. No pressure, no sales pitch. Just a straight answer from someone who's done it many times.

Tim Swindon

Director & Builder · Crowncon Homes

Tim has been building custom homes in SE Bayside Melbourne for over 17 years. He started Crowncon Homes because he believed families deserved a builder who would be honest with them — starting from the very first conversation.