Should you renovate your existing Gold Coast home or knock it down and start fresh? It is one of the biggest decisions homeowners face, and the answer depends on far more than just cost. Your site, your home’s current condition, what you want to achieve, and the local planning rules all play a part.
As someone who holds both a builder’s licence and a building designer’s licence, I have worked on both sides of this decision. Here is how to think through it — and why getting independent design advice before committing either way is the best money you will spend.
The existing structure is sound. If the foundations, framing, and roof are in good condition, renovating preserves a significant amount of embodied value. Demolishing a structurally sound home to build a new one is not always the most cost-effective approach.
You love the location and the character. Many Gold Coast homes — particularly older Queenslanders, mid-century designs, and character homes in established suburbs — have qualities that cannot be replicated in new construction. Wide verandahs, high ceilings, mature gardens, and established streetscapes have genuine value.
Your changes are contained. If you need an additional bedroom, an updated kitchen, or an extended living area, a well-designed renovation can achieve this without the cost, disruption, and waste of a complete rebuild. Our renovation design service is built around getting the maximum result from targeted changes.
Budget constraints. A renovation can often be staged — do the kitchen and living areas now, the bedrooms later. A knockdown rebuild is all or nothing, and you need somewhere to live during the 8-14 months of construction.
The existing home is fundamentally compromised. Severe termite damage, structural defects, asbestos throughout, or a slab that has moved beyond repair can make renovation uneconomical. If fixing the existing problems costs more than 50-60% of a new build, starting fresh usually makes more sense.
The layout cannot be salvaged. Some floor plans simply do not work for modern living and cannot be reasonably modified. If every wall needs to move, every ceiling needs to change, and the plumbing and electrical need complete replacement, you are effectively building a new house inside an old shell — at a premium.
You want to maximise the site. If your block has potential that the existing home does not capture — views, northern aspect, better use of the footprint — a new design can respond to the site in ways that modifying the existing building cannot.
Energy performance. Achieving the NCC 2022 7-star energy rating is straightforward in a new build but can be extremely difficult and expensive when renovating an existing structure. A new home designed for energy performance will be more comfortable and cheaper to run for decades.
The common assumption is that renovating is always cheaper than rebuilding. This is not always true.
Renovation costs on the Gold Coast typically range from $2,000 to $5,000 per square metre for mid-range work, depending on the scope and complexity. Structural changes, wet area relocations, and asbestos removal push costs toward the higher end. The unknown factor is what you find once walls are opened — and on older homes, surprises are common.
New build costs on the Gold Coast range from $2,000 to $3,500 per square metre for a standard to mid-range home, and $3,500 to $5,000+ for custom or architectural builds. Add demolition costs ($15,000 to $40,000 depending on size and asbestos) and temporary accommodation.
For a major renovation that touches most of the house — new kitchen, new bathrooms, structural changes, new roof, updated services — the total cost can approach or exceed a knockdown rebuild. The difference is that the rebuild gives you a brand new home with a new structural warranty, current energy efficiency standards, and a design that actually suits how you want to live.
Renovation: Asbestos removal, structural discoveries behind walls, services (plumbing and electrical) that do not meet current code, matching existing materials and finishes, and the ongoing maintenance costs of retaining old building fabric.
Knockdown rebuild: Demolition and site clearing, temporary accommodation for 8-14 months, disconnection and reconnection of services, landscaping from scratch, and potentially losing mature trees that council may require you to retain.
This decision should not be made by your builder. A builder has a financial interest in whichever option generates more work. A building designer provides independent advice based on your site, your existing home’s condition, your brief, and your budget.
At Design Science, we start with an assessment of your existing property. Because we are licensed builders, we can evaluate the structural condition, identify potential issues, and give you a realistic picture of what renovation would involve. We then compare that with what a new design on the same site could achieve. This comparison — based on real numbers and real site conditions — gives you the information you need to make a confident decision.
Our design process works for both renovation and new build projects. Either way, you end up with construction-ready documentation that builders can price accurately.
Related: Renovation design services | Custom home designs | Building designer costs
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