Start with what your block allows, not what you want

Most owners have the design conversation before the approvals conversation, which is the wrong order. The regulatory position is the only test capable of removing an option entirely. Structure can be repaired and a floor plan reworked. A refusal to permit demolition cannot be designed around.

Two systems apply. Planning controls sit in your council's planning scheme and govern land use and appearance, including whether demolition needs a planning permit. Building controls sit under the Building Act 1993, with the building permit issued by a registered building surveyor rather than the council.

Demolition falls under sections 28, 29A and 29B of that Act, set out in the Building and Plumbing Commission's practice note on demolition of buildings. The order is fixed: settle the planning position, obtain consent to demolish, then apply for the building permit.

Section 29A report and consent, and what triggers it

Under section 29A, council consent must be in hand before a building permit to demolish can issue. It is separate from any planning permit and applies across Victoria. Using the City of Boroondara's Section 29A guidance as a worked example, consent is required where you:

• Demolish or remove 100% of a building, or demolish more than half the volume of the original building
• Demolish or change any part of a facade, meaning an external wall facing a street or laneway, including an attached verandah, balcony or architectural feature

The practice note adds a detail that catches people out: the volume test counts demolition carried out in the preceding three years alongside the work proposed now. Two modest stages done separately can cross the threshold together.

Boroondara assesses applications within 15 business days, matching the response period in the practice note, but requirements and fees vary between councils, so confirm the process with the council covering your property. The practice note also records that where a planning permit is required for the demolition and has not been obtained, the responsible authority must refuse consent.

What council assesses here is whether the demolition itself is appropriate, separately from what you intend to build afterwards, and consent can carry conditions.

Heritage overlays and neighbourhood character overlays

This is where most Melbourne rebuilds either proceed or stop.

Victoria has two heritage systems and they are commonly confused. State significant places sit on the Victorian Heritage Register, administered by Heritage Victoria. Locally significant places are listed in the Heritage Overlay of a council planning scheme, protected under the Planning and Environment Act 1987, with the rules and the list of affected places set out at Clause 43.01 of each planning scheme. Far more Melbourne homes sit in a local overlay than on the state register, so the overlay is the control most likely to affect an ordinary suburban block.

A heritage overlay does not freeze a property. It commonly allows sympathetic alteration and rear additions while treating demolition of the street-facing form as discretionary, meaning council can refuse it. Two houses in the same overlay on the same street can get different answers, because the assessment turns on the significance of the individual place.

A neighbourhood character overlay has a similar effect by a different route. It applies where standard residential controls consistently fail to meet an area's character objectives, and a permit is required to construct a building or carry out works, including single dwellings, alterations and additions. 

Where the schedule to the overlay specifies it, a permit is also needed to demolish or remove a building, or to remove trees. There is no heritage significance test, but it still shapes bulk, siting and street presentation.

Either control can make partial retention, keeping a street-facing facade and rebuilding behind it, the only route to a substantially new house.

The four tests that actually settle it

Each test below either rules an option out or leaves both live, and you run them in order.

Test one: is the structure worth keeping?

Retention only makes sense when there is something worth retaining. Look at the items that are expensive to fix and invisible once fixed.

• Footings and stumps. Movement, cracking and uneven floors point to restumping or underpinning, which adds cost without adding a square metre of amenity.
• Subfloor and roof structure. Timber condition, ventilation, and whether the roof frame can carry a second storey if that is the ambition.
• Wall framing and wet areas. What sits behind the plaster is the largest unknown in any renovation, and the main reason scopes move once work starts.
• Wiring and plumbing. Original services in an older Melbourne home usually need full replacement rather than extension.
• Asbestos. Homes built before the 1990s may contain asbestos in eaves, cladding, wet area sheeting and floor coverings. It is manageable either way, but it complicates access and sequencing on a renovation in a way it does not on a clear site.
• Previous unpermitted work. Additions built without permits must be regularised or removed, and are frequently the worst-built part of the house.

Where a full rewire, replumb, restump and reroof are all in scope before a single new room appears, you are paying most of the cost of a new house to keep an old one.

Test two: can the floor plan become what you want?

This is where the sunk-cost trap sits. A structurally sound house with an unfixable plan is the most common reason a renovation disappoints its owner, because the money goes into preserving the problem.

Work through what the plan physically permits. Where does the northern light fall, and can the living areas reach it? Are ceiling heights workable in the parts you intend to keep? Which walls are load-bearing, and does the arrangement you want require moving them? Wet areas are the expensive ones to relocate, because drainage falls dictate where they can go.

Then the question most owners skip: how does the house meet the garden? On established Melbourne blocks, that gap frequently cannot be fixed without demolishing the rear third of the house, at which point the retention argument has already collapsed.

Test three: what does the site itself impose?

The block sets limits that apply whichever option you choose, and some favour one strongly.

• Slope and levels. Fall across the block affects footings, retaining and how much excavation a new build requires.
• Access. Frontage width, laneway access and overhead services determine whether demolition machinery and deliveries can reach the site.
• Easements and covenants. An easement can rule out building over part of the block. A covenant on title can restrict height, materials or the number of dwellings.
• Site coverage and setbacks. Residential development standards cap how much of the block can be built on and how close to the boundaries.
• Tree protection. Many councils maintain tree registers and protection zones, and a protected tree can dictate where a new house sits.
• Neighbouring buildings and party walls. Attached or closely spaced dwellings bring protection work obligations for the adjoining owner.

Add one that owners underestimate: where the family lives during works. A rebuild means moving out for a known duration. A renovation sometimes allows staged occupation, which sounds cheaper and is difficult to live through. The gap in accommodation cost is often wider than the gap in build cost.

Test four: how long are you staying?

This is the test owners answer least honestly, because the aspirational answer and the real one differ.

A shorter horizon favours a targeted renovation. Fixing the kitchen, the bathrooms and the connection to the garden addresses what makes a house unpleasant to live in, without a programme that outruns your intended stay.

A long horizon changes the arithmetic. A new home resets the maintenance clock and sets one compliance and energy baseline across the whole house rather than a patchwork from different decades. If this is a twenty-year house, that is worth paying for. If it is a five-year house, it is not.

When renovating is the right call

Renovation wins on an established Melbourne block more often than builder marketing suggests.

• The structure is sound, and the expensive invisible items are not all in scope at once
• The plan broadly works, or can work without relocating load-bearing structure and wet areas throughout
• A heritage overlay or neighbourhood character overlay restricts demolition of the existing form
• The ownership horizon is shorter, or uncertain
• The house has genuine character contributing to its value that a new build would not reproduce
• Staying in the area or the house during works matters more than maximising floor area
• The budget delivers more spent on quality of finish across less area than on more area at a thinner specification

A well-executed renovation of a smaller footprint frequently produces a better house to live in than a larger new one. Our high-end renovation work is where owners land when the bones are good and the plan can get there.

When a knock down rebuild is the right call

A rebuild is the right call when the existing house is working against you rather than for you.

• The structure is at the end of its serviceable life, with footings, roof, wiring and plumbing all requiring replacement
• The floor plan cannot be reworked into the house you want, whatever is spent on it
• The existing house does not use the block, through orientation, siting or a footprint far below what the controls allow
• Separate renovation projects have accumulated that, together, approach the scope of building new
• The ownership horizon is long enough to justify full replacement
• One new compliance, energy and warranty baseline is worth more than retaining existing fabric

The case is strongest when several are true at once.

If a rebuild is where you are heading, building a new home from scratch follows a different approval sequence and contract from renovating. We have set that out in our guide to the knock down rebuild process step by step, so it is not repeated here.

The third option most people overlook

The question is usually framed as a binary and frequently is not one.

The first middle path is a substantial extension. Where the house is sound and the problem is size, orientation or the relationship to the garden rather than condition, an extension targets the deficiency without paying to replace what already works. On established blocks this often means keeping the front rooms, usually the best rooms in an older Melbourne house, and rebuilding the rear.

The second is partial retention, and the trade-off deserves clear eyes: it can carry the constraints of a renovation and the cost drivers of new construction at once. Propping a retained facade, tying new structure into old and matching existing fabric are all work neither pure option requires. It is the best answer when the overlay makes it the only answer, and the worst when it is chosen to avoid deciding.

Renovate versus rebuild, side by side

How to find out where your block actually stands

Everything above is answerable within about a week, well before any design commitment.

1. Obtain the planning property report for your address. It is free, issued through the Victorian planning system, and lists the zone and every overlay applying to the property.
2. Check the council's heritage listing and planning scheme schedule. The overlay tells you a control exists. The schedule and the heritage citation tell you what it protects and how strictly.
3. Order a title search. Covenants and easements sit on the title, not the planning report, and either can restrict what is buildable.
4. Engage a registered building surveyor early. They issue the building permit and can advise on the report and consent pathway before you are committed to a design.
5. Get an independent structural condition assessment. Do it before choosing an option, not after. It is the only way to answer test one with evidence rather than optimism.
6. Price both options against the same brief. Most owners compare a fully specified rebuild against a vaguely imagined renovation, which is not a comparison.

Running that sequence is what a pre-construction consultation is for, and it is the honest answer to the question this article opened with. ROMAAC Group is a registered Victorian builder holding licences DB-U 100420 and CD-BU 100477, working on established blocks across Melbourne including our Camberwell build in the City of Boroondara, the council used as the worked example above.

Making the Right Choice for Your Melbourne Block 

Your block and your existing structure decide this, not preference and not a general rule about which option is cheaper. Run the four tests in order, confirm the planning controls on your address first, and price both routes against the same brief. Both options are worth doing well when the site supports them. If you would like that sequence run on your property before you commit to a design, that is the conversation to have first.

Frequently asked questions

1. Is it cheaper to renovate or knock down and rebuild?

Neither is reliably cheaper. Renovation budgets carry more variance because more is unknown until walls come off, while rebuild budgets are more predictable but start with demolition, disposal and service works. Compare both against the same defined brief. 

2. Do I need council approval to demolish my house in Victoria?

Usually yes. Under section 29A of the Building Act 1993, council report and consent is required before a building permit to demolish can issue where you remove 100% of a building, demolish more than half its original volume, or alter any part of a street-facing facade. A planning permit may also apply where an overlay affects the property.

3. Can I knock down and rebuild if my house is in a heritage overlay?

Sometimes, but demolition is discretionary and council can refuse it. A heritage overlay commonly permits sympathetic alteration and rear additions while protecting the street-facing form. Partial retention, keeping the facade and building new behind it, is often the workable path. Check the overlay position and the heritage citation before commissioning a design.

4. Is a knock down rebuild better than an extension?

It depends on what is wrong with the house. An extension is better where the structure is sound and the deficiency is size, orientation or the connection to the garden. A rebuild is better where the structure is at the end of its life or the plan cannot be reworked, because an extension attached to a failing house inherits its problems.

5. What are the hidden costs in a knock down rebuild?

The ones owners miss are rarely in the build contract: demolition and waste disposal, service disconnection and reconnection, consent and permit fees, site preparation on sloping or narrow blocks, hazardous material removal, and accommodation for the construction period. 

6. How do I know if my house is structurally worth renovating?

An independent structural condition assessment is the only reliable answer. It examines footings and stumps, subfloor, roof structure, wall framing, and the age and condition of wiring and plumbing. As a working rule, when a full restump, reroof, rewire and replumb are all in scope before any new space is created, the case for retention has weakened considerably.

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