Most Sunshine Coast homeowners eventually land on the same question: work with the house we have, or start again? There is no universal answer. The call comes down to six things — the structure, whether the floor plan can be made to work, what the planning scheme allows on your block, the cost of meeting current standards, asbestos, and what the existing home is genuinely worth to you.
Is it cheaper to renovate or rebuild?
Renovating is generally cheaper when you keep the existing footprint, the floor structure and frame are sound, and you are not relocating wet areas or removing load-bearing walls. Rebuilding often becomes better value once the work touches the roof, the frame, the services and the layout all at once — because at that point you are paying for demolition and reconstruction anyway, only inside constraints somebody else set forty years ago.
Be wary of anyone quoting a per-square-metre figure over the phone. Renovation cost is driven by what nobody can see until the linings come off: rot and termite damage, undersized or corroded footings, old wiring and plumbing, failed waterproofing. Coastal blocks at Coolum Beach, Marcus Beach and Noosa add salt exposure and, on sloping sites, access that decides how much can be done by machine rather than by hand.
Is a knockdown rebuild worth it?
A knockdown rebuild is usually worth it when the land is the asset and the house is not — a common position in Noosa Heads, Coolum Beach and Pelican Waters — or when the existing home fights every change you want to make. You get a whole house built to one standard, with one set of documentation and one warranty, rather than a new wing bolted onto an old one.
It is often not worth it in one situation people underestimate: the planning scheme has tightened since the original house was built. An older dwelling can sit legally where a new one could not. Replace it and the new house must meet current setbacks, height limits, site cover, coastal hazard and flood provisions — which on some coastal and Noosa blocks means the replacement is smaller, lower or further from the boundary than what you just demolished. Check that before you commit.
Renovate or rebuild: a side-by-side comparison
| Consideration | Renovate or extend | Knock down and rebuild |
|---|---|---|
| Existing structure | You inherit it, good and bad | Irrelevant beyond demolition cost |
| Planning risk | Lower; existing siting retained | Higher; current scheme applies in full |
| Building code | Only the work you touch complies | The whole house complies |
| Design freedom | Limited by grid, ceilings, orientation | Free within the planning envelope |
| Cost certainty | Low until the house is opened up | Higher; fewer hidden unknowns |
| Living arrangements | You may stay in part of the home | You move out for the build |
| Heritage or character overlay | Usually workable | Can be the deciding obstacle |
| Best suited to | Sound house, fixable plan | Poor house, good block |
Is the existing structure worth building on?
Start here, because it is a physical test rather than a matter of taste. Have a licensed builder, and where warranted a structural engineer, look at the stumps or piers, subfloor, roof frame, slab edge and any signs of movement. On the Sunshine Coast we watch for termite activity, timber decay where a deck or wet area has been leaking quietly for years, and corrosion in fixings on salt-exposed sites. A straight, dry, well-founded house is worth renovating even when it looks tired. One that has moved, or sits on footings that will not carry the loads you want to add, makes you pay twice.
Can the existing floor plan actually work?
Plenty of structurally sound Sunshine Coast homes were designed with their back to everything worth facing: small openings, low ceilings, dark central cores, living areas pointed at the street instead of the north-east breeze. If the wet areas can stay roughly put, the roof can carry a new opening, and northern light can reach the main living space without demolishing half the house, a renovation will usually deliver. If every idea requires the roof off, the slab cut and the services relocated, you have designed a new house around an old one. Our Grandview Drive Extension at Coolum Beach was the opposite case — a pole home with good bones, extended in every direction, which won three awards at the 2025 Master Builders Queensland Sunshine Coast Housing & Construction Awards.
Do you need council approval to demolish a house on the Sunshine Coast?
Demolishing a house is building work under the Building Act 1975, so it needs building approval from a building certifier. Whether you also need development approval from council depends on the overlays over your lot, set by the Sunshine Coast Planning Scheme 2014, which council records as gazetted on 2 May 2014 and commenced on 21 May 2014, or, in Noosa Shire, The Noosa Plan 2020. Heritage and character provisions are the usual trigger: where they apply, demolition can become assessable development and the outcome is not guaranteed. Vegetation, coastal hazard, flood and bushfire overlays then shape what may replace it. Check the council’s property mapping before spending money on design.
Can you knock down and rebuild in Noosa Shire?
Often, yes — but Noosa Shire runs its own scheme, The Noosa Plan 2020, and it is deliberately protective of building height, vegetation and the low-rise coastal character of suburbs such as Noosa Heads and Marcus Beach. A rebuild there needs the planning envelope resolved before the design is locked in, not the other way around.
What does it cost to bring an old Queensland house up to current standards?
This is where the money moves. A renovation only has to bring the parts you actually touch up to current requirements. A new house must comply with the National Construction Code in full — energy efficiency, waterproofing, glazing, termite management, wind loading, and the pool safety standard where a pool is involved. The energy efficiency provisions in the Australian Building Codes Board’s NCC 2022, the edition currently in force, bring in thermal performance limits and whole-of-home efficiency requirements well beyond anything a 1970s coastal house was built to. Chasing that performance in an old home means relining, reglazing, insulating, rewiring and re-plumbing. Done selectively it is good value; done comprehensively it approaches the cost of building new without giving you a new house.
Does a renovation have to meet the current building code?
The new work does. Existing parts you are not altering generally do not have to be retrospectively upgraded, though your certifier will require compliance where the new work affects them — structural adequacy, egress, or waterproofing to a new wet area. Your building certifier makes that call, which is why it pays to involve one early rather than after the drawings are finished.
What happens if the house contains asbestos?
Asbestos cement sheeting — fibro — was used in many Queensland buildings before 1990, as WorkSafe Queensland notes, for cladding, roofs and fences, and often as backing boards in wet areas like kitchens and bathrooms. On the Sunshine Coast that makes it a live question for most older homes. Finding it is not automatically a reason to demolish, and demolishing does not make it disappear: sections 452 and 453 of the Work Health and Safety Regulation 2011 require asbestos to be removed before demolition begins so far as is reasonably practicable, as WorkSafe Queensland sets out in its asbestos and demolition guidance. On licensing, WorkSafe Queensland states that no licence is required to remove ten square metres or less of non-friable asbestos; a class B licence covers more than ten square metres of non-friable material, and a class A licence is required for any amount of friable asbestos. What matters is that removal is identified and priced up front, not discovered mid-project.
What is the existing house worth to you that a new one is not?
Spreadsheets miss things that matter. A mature poinciana or a stand of established tuckeroos cannot be bought back, nor can a garden twenty years in the making, a pool that already complies, or the chance to stay in part of the home instead of renting elsewhere for the length of the build. Wanting to keep the house your children grew up in is a legitimate input, not a sentimental indulgence. Weigh it in both directions: improving a house you love is a good outcome, and so is admitting that what you love is the block, the light and the breeze.
Do you need a written contract for a renovation in Queensland?
Yes, and the same protections apply whichever path you take. The Queensland Building and Construction Commission requires a written contract for domestic building work priced over $3,300 including labour, materials and GST — a Level 1 contract for work from $3,301 to $19,999, and a Level 2 contract for work of $20,000 and over. Where the contract is Level 2, the QBCC also requires the builder to give you a copy of the QBCC consumer building guide before you sign. Separately, the QBCC requires Queensland Home Warranty Scheme insurance on most residential building work valued at more than $3,300. Check any builder’s licence number on the QBCC’s online register before signing.
Getting a second opinion before you commit
The cheapest hour you will spend is the one where a licensed builder walks the house with you and tells you which path it actually supports. Roebuck Concepts is a Coolum Beach builder working across the Sunshine Coast and Noosa Shire, holding QBCC licence 15280811 and a member of Master Builders Queensland. For the detail on each option, read our guides to knockdown rebuilds on the Sunshine Coast and renovation building, or call Tom on 0477 333 386.