It's one of the biggest calls a homeowner makes. The house is in the right spot but it isn't working anymore, and you're stuck between two roads: renovate and extend what's there, or knock it down and start again. Both can be the right answer. The trick is matching the decision to your house, your budget and your plans, rather than to whatever the last person you spoke to did.
We build across Wollongong, the Illawarra and the Southern Highlands, and we do both renovations and extensions, so we've got no axe to grind either way. Here's the framework we'd walk you through.
Renovation vs knockdown rebuild: how to decide
Renovate if the house is structurally sound and the problem is space or layout; knock down and rebuild if the structure is tired, the block is easy and a renovation would cost more than about half of what a new house would. That one test settles most Illawarra homes, because the majority of the housing stock here is solid brick or timber on blocks people want to stay in, and a dated plan is a renovation problem, not a demolition one.
The rest of this guide works through the four things that feed that call: the condition of the existing house, the honest cost comparison, the planning controls on the block, and how long you intend to stay. If the rebuild side wins, our knockdown rebuild page covers how that job runs, and if you want a sense of how long a renovation keeps you out of your kitchen, read how long a renovation takes first.
Start with the house you've got
The condition and bones of the existing home decide a lot. Some questions worth being honest about:
- Is the structure sound? A house with good footings, solid framing and a sensible layout is a strong candidate for a renovation or extension. One that's riddled with rot, termite damage or a failing slab is a different conversation.
- Is the layout fixable? Sometimes the problem is just a few closed-off rooms that want opening up, which is straightforward. Sometimes the floor plan is so awkward that no amount of reworking fixes it.
- What's actually good about it? Original features, a solid double-brick shell, ceiling height, the way it sits on the block. These are things worth keeping that a rebuild would throw away.
If the house is fundamentally sound and the issue is space or layout, you're usually in renovate-or-extend territory. If it's structurally tired and poorly built, a rebuild starts to make sense.
Weigh the cost honestly
Cost is where people often get caught out, in both directions.
A renovation or extension lets you spend where it counts and keep what already works, which usually makes it the cheaper option. You're not paying to rebuild walls, floors and a roof that are perfectly fine. But renovations can throw up surprises once you open things up, especially in older Illawarra homes, where you might find soft framing or a bathroom that was never waterproofed. A good builder allows for the likely surprises and is straight with you about the unknowns.
A knockdown rebuild has a higher base cost, because you're paying for demolition and a whole new house. The upside is fewer surprises, because everything's new, and you get exactly the home you design with none of the compromises an old structure forces on you. The downsides are the bigger spend, the longer build, and the fact you have to move out for the whole job.
A useful rule of thumb: if a renovation would cost more than about half what a rebuild would, and the existing house has real problems, the rebuild starts looking like better value. If you can get most of what you want for well under that, renovating usually wins.
Heritage, planning and the block
Some homes can't be knocked down easily. A heritage listing, a conservation area, or certain planning controls can rule a rebuild out or make it a long, expensive process. In those cases a sympathetic renovation or extension isn't just the cheaper path, it's the only realistic one. It's worth checking your block's controls early, because they can make the decision for you.
The block itself matters too. A sloping or constrained site can make a rebuild more expensive than the same house on flat land, which tilts the maths back towards working with what you've got.
How long will you stay?
This one's easy to skip and it matters more than people think.
If this is your long-term home, the one you plan to be in for the next decade or more, it's worth investing properly, whichever path you choose. A rebuild or a major renovation both make sense when you'll be there to enjoy it.
If you're likely to move in a few years, a full rebuild rarely pays off, because you won't be there long enough to get the value back. A targeted renovation, a new kitchen and bathroom and an extra room, often gives you both a better place to live now and a better resale, for far less outlay.
Where we land for most Illawarra homes
Here's our honest read, and we say this as a builder that does both. For a lot of Illawarra homes, a smart renovation or extension is the better value. Plenty of the housing stock down here is structurally sound, double-brick or solid timber, sitting on blocks in suburbs people want to live in. The issue is usually a dated, closed-off layout and a shortage of space, not a house that's falling down. Both of those are exactly what a good renovation or extension fixes, and you keep the things about the house and the location that drew you to it in the first place.
That's not always the answer. A genuinely tired, poorly built house on flat, easy land can be a fair candidate for a rebuild. But the assumption that "old house equals knock it down" costs people a lot of money they didn't need to spend.
Get a real opinion before you decide
The best thing you can do is have a builder who'll be straight with you walk the house and tell you honestly which way it leans. We do exactly that, and because we handle home renovations and home extensions, we've got no reason to push you one way over the other.
If you're weighing it up, call us on 0434 037 851 or get in touch through the contact page for a free, no-pressure look at your place.
Want a hand with this at your place? Get a free quote or call 0434 037 851.