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A knock down rebuild in Brisbane means demolishing your existing house and building a new home on the same block. It usually makes sense when the land and location suit you but the house does not. Most projects follow six steps: feasibility and site check, design, approvals, demolition, build and handover, and the homework done before demolition decides how smoothly it runs.
We are a QBCC licensed builder (licence 15267396) and Master Builders Queensland member based in Slacks Creek, building custom homes across Brisbane, Logan, Ipswich, Redlands and the Gold Coast. This guide walks through how a knock down rebuild actually works, what to check first and how to choose the right builder for it.
Most people weighing up a knock down rebuild are really choosing between three options. Each one suits a different situation.
| Option | Best when | Watch out for |
|---|---|---|
| Knock down rebuild | The layout fights you, the structure is tired, or you need more space, but you love the street, school catchment or commute | Overlays that limit demolition, and moving out for the whole build |
| Renovate | The bones are sound and your wish list is mostly a new kitchen, bathrooms or better flow | If fixing the layout means moving most walls and wet areas anyway, a rebuild may be better value |
| Move | The block is too small, restricted by an overlay or in the wrong place for your next stage of life | Giving up the location you chose the house for |
A rebuild tends to make sense when the house is the problem and the land is not. Maybe the layout fights you, and fixing it would mean moving most walls, wet areas and the kitchen anyway. Maybe the structure is tired, with sagging floors, termite damage, poor footings or old wiring and plumbing throughout. Or you simply want more space, a second storey or a better orientation than the existing frame can give you. If you also love the street, rebuilding lets you keep it while starting fresh.
If the bones are sound, a renovation is often the smarter path. It keeps the parts of the house that still work, and the work can often be staged. Our home renovation builders can tell you honestly which side of the line your house sits on.
Sometimes the block itself is the limit: too small for what you need, restricted by an overlay, or in the wrong place for the next stage of your life. No amount of building will fix that, and buying elsewhere may be the better move.
The easiest way to decide is a site visit with a builder before you commit to any path.
Every block is different, but most knock down rebuild projects follow the same six stages.
This is where the project is won or lost. Before any design work starts, your builder should look at the size and shape of the block, the slope, soil and drainage, access for machinery, where the sewer and stormwater run, trees, neighbouring homes and any overlays that apply to your lot. A survey and soil test usually follow, so the design is based on facts rather than guesses.
With the site understood, design can begin. A custom design lets you place living areas to catch breezes and light, fit the home to the land rather than flattening the block, and plan for how your family will use the house in ten or twenty years. Expect a few rounds of drawings before everything feels right.
A new home needs building approval, and some lots also need planning approval from council, for example where an overlay applies or the design sits outside the standard settings. Demolition can need its own approval too. Your council and private certifier set the rules for your lot; we check this at the start so there are no surprises halfway through.
Before the old house comes down, services such as electricity, gas, water, sewer and telecommunications need to be disconnected or capped with the relevant providers. Older homes may contain asbestos, which must be assessed and removed by licensed specialists before general demolition starts. Once the site is clear, it is prepared for the new slab or footings.
The build follows a familiar sequence: footings and slab, frame, roof, lock-up, services, internal linings, fit-off and finishes, with inspections at key stages along the way. Communication matters most here. You should always know what is happening on site and which decisions are coming up next.
Before you get the keys, walk through the finished home with your builder, note anything that needs attention and collect your certificates, warranties and appliance documents. Then you move back onto the street you love, into a house designed around you.
Many of Brisbane’s established suburbs sit on hills, and plenty of older blocks are narrower than standard project home designs allow for. Neither rules out a knock down rebuild, but both change how the home should be designed.
On a slope, the choice is between cutting and filling to make the land flat, or designing the home to step with it. Stepped floor levels, a suspended slab or a split level layout can reduce earthworks and retaining walls, and often give you better views and breezes. Our custom home in Bridgeman Downs is a stepped home built to suit an uneven block, and our sloping block home builders page covers the options in more detail.
Narrow lots push the design upwards and inwards. A double storey layout, a central courtyard or clever use of side setbacks can bring in light without overlooking the neighbours. Access also matters during construction, since deliveries, machinery and skip bins all need somewhere to go.
In parts of Brisbane, older homes such as pre-war Queenslanders and workers’ cottages can be protected by character or heritage overlays. Where these apply, demolition may be restricted or need specific approval, and in some cases it may not be allowed at all. Neighbouring streets can have quite different rules.
The key step is to check before you buy, design or sign anything. Council mapping is a good place to start, and your builder and certifier can confirm what applies to your lot during the feasibility stage. If an overlay means the existing house has to stay, a renovation, raise or extension may still get you most of what you want.
This is the part people often leave too late. A knock down rebuild means moving out for the whole project, from demolition through to handover, so it pays to plan early.
Every knock down rebuild is priced on its own block and design, so the only reliable number is a written quote. What we can tell you is what moves that number most.
| Cost driver | What makes the difference |
|---|---|
| The site | Slope, soil type, rock, retaining walls, drainage and the location of the sewer main all affect footings and earthworks. |
| The old house | Its size, construction and whether asbestos is present change demolition time and disposal. |
| The design | Floor area, number of storeys, roof shape and how complex the plan is. |
| Your selections | Kitchens, bathrooms, flooring, windows and joinery, especially where you choose custom over standard. |
| Approvals and access | Overlays, extra reports and tight access can all add time and work. |
A good builder will walk you through each of these on site and show clearly where the money goes, so you can see where you have room to adjust. A free quote is the quickest way to get real numbers for your block.
A knock down rebuild is a custom build on a site with history, so the builder matters as much as the design. When you compare builders, check:
Take your time at this stage. The right builder will be happy to answer every question before you sign. You can see the homes we have built on our custom home builders page.
If you are weighing up a knock down rebuild in Brisbane, Logan, Ipswich, Redlands or the Gold Coast, start with a conversation about your block. Get in touch for a free quote or call us on 0420 266 652, and we will help you work out whether a rebuild, a renovation or something else makes the most sense.
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