The right answer between renovating, extending, knocking down to rebuild, or moving depends on six things: the structural condition of your existing home, your suburb's land-to-build ratio, your budget tolerance, your timeline, your tax position, and how much disruption your family can absorb. Most Canberra families I sit down with assume the answer is obvious before they start asking, and most are wrong about which option actually serves them best. This is the single highest-stakes decision in homeownership outside of buying the house in the first place, so it deserves a clear framework rather than a gut call.

I'm Jeff. I've been in the Canberra building industry for 19 years, the last 5 of those running Rentoule Projects. I sit down with roughly two Canberra families a week who are working through this exact decision. About a third end up renovating, a third end up extending, a quarter end up doing a knockdown rebuild, and the rest either sell and buy a different home or decide to do nothing for now. There is no single right answer. But there is a right answer for each family once you work through the variables honestly. This article walks through the framework I use in those conversations.

Why this decision is hard

It is hard because the four options are not really comparable on a single axis. Renovating is a $150k to $600k+ decision with 4-8 months of inconvenience. Extending is a $250k to $500k+ decision with 6-12 months of inconvenience and a DA. Knocking down and rebuilding is an $850k to $1.6 million+ decision with 14-20 months of inconvenience and a year-plus in temporary accommodation. Moving is an $80k to $150k transactional cost (stamp duty, agent fees, removalists, lost time) plus the cost of buying a different home and the soft cost of starting over in a different suburb.

It is also hard because every conversation you have skews the answer toward whoever is talking. Renovation builders say renovate. New build companies say rebuild. Real estate agents say sell and buy. Your in-laws say stay put. None of those people are looking at your specific block, your specific budget, your specific family, and your specific timeline.

The framework below is the one I walk clients through. It will not give you the answer in five minutes. It will give you the right questions to ask yourself in the right order.

The four options, briefly

Renovate means working within the existing footprint of the house. You retain the existing structure and floor plan and you change finishes, fixtures, sometimes internal walls within the existing envelope. Cost range for a meaningful renovation in Canberra: $150,000 to $600,000+ depending on scope and finish level. Timeline: 4 to 8 months on site, plus 2-4 months of design and approvals. The house remains structurally what it was. You can live in it during minor renovations; you cannot live in it during a full strip-out. For full cost detail by project type, see our Canberra renovation costs guide.

Extend means adding floor area to the existing house. Most extensions in Canberra are ground floor rear extensions ($3,200 to $5,200 per square metre) or second storey additions ($4,800 to $7,500+ per square metre). A 40 square metre extension typically costs $135,000 to $215,000 all-in. Timeline: 6 to 12 months including DA. You can usually live in the house during most of construction although the last 4-6 weeks (when the new and existing structures are joined) are disruptive. Our home extension cost guide covers this in detail.

Knockdown rebuild means demolishing the existing house and building a new custom home on the same block. Cost range: $850,000 to $1.6 million+ for the build, plus $25,000 to $35,000 for demolition. Timeline: 14 to 20 months including DA, demolition, construction and handover. You cannot live on the block during construction. Budget for 12-18 months of rental or alternative accommodation.

Move means selling your current home and buying a different one. Transaction costs in the ACT are significant: stamp duty on the purchase ($30,000 to $80,000 depending on price), real estate agent commission on the sale ($25,000 to $60,000), legal and conveyancing fees ($3,000 to $6,000), removalists ($3,000 to $8,000), and the soft cost of starting over in a new suburb with new schools, new commute, new neighbours. Timeline: 3-6 months from listing to settling. Worth noting: from 1 July 2026, the ACT 2026-27 Budget abolishes stamp duty for all first home buyers, which slightly changes the move calculation if anyone in the household is buying their first home.

The six questions to actually ask yourself

1. What are the bones of the existing house worth?

Walk through your house and ask: if everything was new, would the layout still work? Are the rooms in the right places? Is the natural light reasonable? Are the load-bearing walls in places that limit what you can do? Is the slab in good condition? Is the roofline working with you or against you?

If the bones are good and you mostly need a finish-level refresh plus some internal layout changes, you are a renovation candidate. If the bones are sound but the floor area is too small, you are an extension candidate. If the layout is fundamentally wrong (multiple load-bearing walls in the wrong places, a kitchen that cannot be relocated, a heritage problem that prevents the design you actually want) or the structure is genuinely past its useful life, you are a rebuild candidate.

The Ainslie 1950s brick veneer with a hipped roof and three small bedrooms is almost always a rebuild or a substantial extension. The Yarralumla 1960s home with good bones and a poor layout is often a renovation with some internal restructuring. The Hawker 1970s home with strong slab and decent layout but tired finishes is usually a renovation. Your specific house is its own case.

2. What does your block and suburb support?

This is where most owners get the answer wrong. A 700 square metre block in Ainslie supports a rebuild because the land is worth $1.4 to $2.2 million and a new build worth $2 million+ adds up financially. The same 700 square metre block in Kambah where land is $550 to $700k often does not support a rebuild because the end value of the rebuilt home may not justify the build cost.

The rough test: if your block alone (land only, vacant) would sell for more than $1 million, a knockdown rebuild can usually be financially justified for owners who plan to stay long-term or sell at the top of the market. If your block alone would sell for less than $700,000, renovation or extension is usually a stronger ROI play. Between those numbers, the maths is sensitive to the specifics.

The new ACT Missing Middle Housing reform (MPA04, approved by the Planning Minister on 22 May 2026, with major financial incentives added in the 9 June Budget) also widens the picture. RZ1 and RZ2 blocks across most established Canberra suburbs can now potentially carry multi-unit developments, and the temporary 50 per cent Lease Variation Charge reduction announced in the Budget materially improves the financial maths. Our full MPA04 explainer goes deeper on this.

3. What is your budget tolerance and how does it match the option?

Be honest about what you can spend, not what you wish you could spend. Most families I sit with quote me a number, and the real budget (after a banker conversation) is 20-30 per cent higher. That is fine. But the conversation should be grounded in actual numbers, not aspirational ones.

Match the option to the budget:

  • Under $250k available: renovation is your only realistic option
  • $250k to $500k: meaningful renovation or modest extension
  • $500k to $900k: full renovation, larger extension, or moderate knockdown rebuild
  • $900k to $1.5M: most options are open including a quality custom new build
  • $1.5M+: full custom rebuild with premium finish, or significant land upgrade

If your dream is a custom new home but your budget is $400k, no amount of clever design will bridge that gap. The honest conversation is about which option produces the best outcome with the money you actually have. For real cost breakdowns by project type, see our guides on home renovation costs and home extension costs.

4. What is your timeline and how much disruption can your family absorb?

This question kills more rebuild plans than any other. The numbers:

  • Renovation (full strip-out, lived in elsewhere): 4-8 months on site
  • Renovation (partial, lived in during): 6-12 months with significant disruption
  • Extension (lived in during): 6-12 months, last 4-6 weeks brutal
  • Knockdown rebuild: 14-20 months total, 12-18 months in alternative accommodation
  • Move: 3-6 months to settle

A young family with a new baby and two kids in primary school usually cannot absorb a 14-month rebuild with temporary accommodation. A family with older teenagers and a smaller dog often can. The financial answer and the family answer have to agree, and they often do not at first.

5. What is your tax position?

This is more important than it used to be after the recent Federal Budget. For your principal residence, capital gains tax is not in play and negative gearing is irrelevant. For investment properties, the new rules around negative gearing on established stock (from 1 July 2027) and the CGT changes around new builds materially change the equation. A knockdown rebuild that creates two new dwellings now has tax advantages that a single rebuild does not. Our Federal Budget 2026 article covers the specifics.

Also worth checking: in the ACT, the Lease Variation Charge can be a significant cost if you change the permitted use of your Crown Lease (such as moving from single dwelling to multi-unit), although the recent 50 per cent temporary reduction for Missing Middle developments has softened this. Talk to a registered tax adviser before committing.

6. What is the right answer for the next ten years, not just this year?

The cheapest mistake to make is the one you only have to fix once. Buying back into a different home and then deciding three years later that you need to renovate it is two transactions and three rounds of disruption. Renovating now and then deciding in five years that you needed a rebuild is also two rounds. The right answer factors in your family's likely trajectory: are the kids getting bigger, are the parents getting older, are you likely to need more rooms or fewer, is the suburb you live in still the right suburb in ten years?

If the suburb is right for the next ten years, renovate, extend or rebuild. If the suburb is not right for the next ten years, the only winning move is to move now and avoid the building exercise altogether. Spending $400k upgrading a home in a suburb you will leave in five years is a losing move every time.

Three worked examples

The Inner North family. Couple in their late 30s, two kids in primary school. Own a 1960s three-bedroom brick veneer on a 700 square metre RZ1 block in Watson, bought 8 years ago, now worth $1.6 million (land alone $1.1 million, structure adds $500k). Budget: $750k available with some equity headroom. They love the suburb and the schools.

Right answer for them: substantial extension with internal renovation, total cost around $650k all-in. They keep the existing front of the house, extend the rear by 50 square metres to create open-plan living and a fourth bedroom, and redo the kitchen, bathrooms, and finishes throughout. They live in the house for 6 months of the build and 6 weeks of brutal disruption. After: they have a $2.4 million home in the suburb they love for $650k of work. Better return than a $1.2 million rebuild on the same block.

The Inner South family. Couple in their late 40s, kids are teenagers. Own a 1950s home on a 650 square metre RZ1 block in Yarralumla worth $1.9 million. Budget: $1.2 million available. They are 8 years from the kids being independent and they value design quality.

Right answer for them: knockdown rebuild. The 1950s structure does not support the floor plan or design quality they want for the next 10-15 years. They build a four-bedroom architect-designed home for $1.1 million build plus $25k demolition plus $80k design and approvals. They rent in the suburb for 14 months. After: they have a $3.4 million home in the suburb they love that is exactly what they wanted.

The outer-suburb family. Couple in their mid 30s, three young kids. Own a 1990s home on a 600 square metre block in Macgregor worth $850k. Budget: $300k. The suburb is fine, the schools are okay, but they are wondering if they should move closer to Belconnen for better commute.

Right answer for them: this is a move conversation, not a build conversation. The block does not support a rebuild financially. A $300k renovation on the existing house will produce a $1.0-1.1 million home in Macgregor where land values cap the upside. The same $300k applied to upgrading their position in a better suburb (selling $850k, buying $1.0 million with the difference, plus transaction costs) gives them a stronger long-term position. Most builders will not tell them this. We do.

What we do at Rentoule

We start with a coffee, walk through the block, and have an honest conversation about which of the four options serves you best. About a third of the families I talk to do not end up doing a renovation or rebuild with us. They go away with clarity and they do whatever makes sense for them. The day they decide to build, they remember the conversation and they come back.

We do not pitch you a project the day we meet. We tell you what we would do if it was our own family on your block. If we are the right builder for the path you choose, we build it on a fixed-price contract with me personally across every project. If we are not the right builder, we will tell you who is. Our knockdown rebuild service and dual occupancy service pages cover the build side in more detail.

If you are sitting on this decision and have been for a while, the cost of inaction is real. Another year passes, another winter of cold rooms and cramped kitchens, another summer of frustration. Get the conversation started, even if you are not ready to build for 12 months.

Frequently asked questions

How do I work out the value of my block without the house on it?

Get a written appraisal from two local real estate agents who know your suburb well. Tell them you are considering knocking down and ask for the land-only value in the current market. The number you get will be approximate but it is the starting point for any rebuild feasibility. For more precision, an independent valuer charges $400-$700 for a written valuation.

Is renovating ever cheaper per square metre than rebuilding?

Yes, for finished work, almost always. Renovation costs in Canberra run roughly $2,500-$5,000 per square metre for the renovated area. New build costs run $3,500-$5,500 per square metre of new construction. The reason families still choose rebuild is that a rebuild gives you a fully new home with current standards (NCC 2025 energy efficiency, modern layout, full warranty), while a renovation gives you an improved older home with one foot in the past.

What about moving to a new suburb to get a bigger or newer house?

Worth modelling honestly. Calculate cost to sell (agent 1.5-2.5 per cent, legal $2-3k), cost to buy ($30-80k stamp duty depending on price, legal, removalists, soft costs). Total transaction cost is usually $80-$150k. If a renovation of the same scope on your current home costs $300k but you could buy a home that already has the features you want for the price difference plus transaction cost, the move might be the right answer. The maths is sensitive but it should be modelled, not dismissed.

How long should I budget for the decision itself?

If you have not yet had a serious conversation with a builder, a valuer, and a tax adviser, give yourself 6-12 weeks to work through it properly. Decisions made in two weeks tend to get reversed. Decisions made in six months tend to stick. The decision is too important to rush and too important to postpone indefinitely.

Can you help me work out which option is right for my family?

Yes. That is exactly the conversation I prefer to start with. Get in touch and we will arrange a no-obligation site visit. I will walk through the four options for your specific block, give you a frank assessment of which one I would choose if it was my family, and you can take that thinking wherever you want from there. Coffee is on me.

The honest takeaway

There is no single right answer between renovating, extending, knocking down to rebuild, or moving. There is a right answer for your specific family on your specific block at this specific time. The framework above will get you to the right question. The conversation will get you to the right answer.

If you want clarity rather than a sales pitch, that is the conversation we have. Get in touch when you are ready.