Should you reconfigure your Melbourne house or extend it?

By Barbara Yerondais
Oct 10, 2026

Answering: Should we reconfigure our existing Melbourne floor plan, or do we need to add on?

Estimated reading time: 14 min read

Reconfigure first when your Melbourne house has enough floor area arranged in the wrong order, and add on only when an honest test of the existing plan shows the household has outgrown the footprint. The test is worth doing before anyone draws, because in Victoria’s General Residential Zone a structural change that does not make a dwelling bigger needs no planning permit, while extending a house on a lot under 300 square metres does. Barbara Yerondais, a fixed-fee renovation and extension architect with more than 35 years in practice, leads BY Projects Architecture, a practice with more than 400 projects in Victoria. The decision can go wrong in both directions: the handsome extension that still lives like a rabbit warren, and the gut renovation that never finds the bedroom the family needed.

You know the evening loop. Homework spreads across the dining table because the so-called study is really a corridor with a desk in it. The kitchen faces the side fence, and nobody ever carries a plate out to the garden. One of you has started saying extension. The other keeps saying just open it up. Both sound expensive, and neither is obviously right.

Choose the wrong path and the first big cheques go on drawings, permits and builder preliminaries that answer the wrong problem. You spend the budget and planning window you had, then live another year in a house that fights the way your family already lives.

So before anyone draws a new wing, answer a sharper question: is this house short on space, or short on a plan that works?

Key Insights

  • A plan failure is rooms in the wrong order, dead corridors or a kitchen cut off from the garden. An area failure is a need, such as another bedroom or a second living space, that no arrangement of the existing rooms can meet.
  • In Victoria’s General Residential Zone, structural changes need no planning permit as long as neither the dwelling’s size nor the number of dwellings increases. Extending one dwelling on a lot under 300 square metres in the main residential zones needs a permit assessed against Clause 54.
  • Reconfiguring is still building work. The Building and Plumbing Commission says renovations may not need a building permit only where the home’s structural soundness and safety are not affected, so plan on one for load-bearing walls.
  • The answer is often a mix. Barbara Yerondais’s practice turned a 3-bedroom, 1-bathroom Altona house into 4 bedrooms and 2 bathrooms by reworking the existing footprint and enclosing one underused rear patio.
  • Talk to Barbara first: a free, no-obligation call, then a one-hour Feasibility Session, in person or on Zoom, if it is a fit.

Table of Contents

Plan failure or area failure: the question under the question

Most owners arrive with a solution already chosen. An extension feels like progress you can see from the street; opening up feels quicker and cheaper. Both answer a question nobody has asked yet: what, exactly, is failing?

A plan failure means the square metres are there but arranged against you. Rooms sit in the wrong order, so the front living room goes unused while everyone crowds the kitchen. Light reaches one or two rooms and leaves the middle of the house dim. The kitchen faces a fence while the garden sits behind a laundry.

An area failure is different. The household needs something the house cannot give in any arrangement: another bedroom, a second living space so teenagers and adults are not in one room every night, a bathroom without a queue, or a work room with a door that closes. Moving walls can make an area-short house feel better for a season, but it cannot conjure a room the footprint does not hold.

Plenty of Melbourne houses have both problems at once, which is why the honest answer is so often a reconfiguration with a smaller addition than the one first briefed. Solve the plan first, on paper, then see what is still missing. Whatever is left is the size of the add-on you actually need.

Four tests that show which one you have

Run these at the kitchen table with a copy of your existing floor plan and a pencil.

  1. House every need without adding a square metre. List every bedroom, study, living space, storage need and bathroom the household needs. Then give each one a room on the existing plan, moving internal walls freely. If every need finds a home, you have a plan failure. If one or two are left standing with nowhere to go, you have an area failure of about that size.
  2. Walk the daily route. Trace the paths your household walks most: front door to kitchen, kitchen to garden, bedrooms to bathroom. Long, dark or doubled-back routes point to the plan. A route that works but ends in a room too small to use points to area.
  3. Find the dead floor. Shade every space nobody really uses: passages, a formal room opened twice a year, a back patio that is outdoor living in name only. Dead floor is the cheapest floor area you will ever gain, because it is already built.
  4. Read the site before anyone draws. Pull the Planning Property Report for your address through VicPlan. It shows your zone, any overlays, whether the property is on the Victorian Heritage Register and whether it sits in a bushfire prone area. Note your lot size too. These decide what kind of add-on is even available.

If tests one to three point to the plan, the add-on may be unnecessary. If they point to area, test four tells you what shape of addition the site will accept.

What Victorian planning rules say about each path

Reconfiguring inside the footprint. In the General Residential Zone, Clause 32.08 says no permit is required to make structural changes to a dwelling, provided the size of the dwelling is not increased or the number of dwellings is not increased. Overlays are the exception to check. Under a heritage overlay, for example, Clause 43.01 requires a permit to demolish or construct, and to internally alter a building only where the overlay’s schedule lists internal alteration controls for that property.

Building regulation still applies. The Building and Plumbing Commission says all building and demolition work needs a building permit unless an exemption applies, and renovations may not need one only where the structural soundness and safety of the home are not affected. Taking out load-bearing walls is structural work by definition.

Adding on. On a lot under 300 square metres in the main residential zones, extending one dwelling needs a planning permit assessed against Clause 54. Its standards cover setbacks, height, walls on boundaries, site coverage, daylight to existing windows, overshadowing and overlooking, among others. A proposal that meets every VicSmart eligibility standard, and needs no other permit outside the VicSmart classes, is a VicSmart application: council has 10 business days to decide it, and it is not advertised. On larger lots, Clause 54 in most cases does not apply, and siting is assessed with the building permit instead. Where a planning permit is needed, Consumer Affairs Victoria says it must come before the building permit.

Barbara Yerondais’s practice has lodged more than 200 permit applications, a record of the process and never a promise about yours.

Reconfigure, add on, or both: the paths side by side

Weighing Reconfigure inside the footprint Add on Reconfigure plus a smaller addition
What it fixes Flow, light, room order, dead floor A genuine shortage of rooms or floor area A plan problem with one missing room behind it
Planning permit (General Residential Zone) Not required for structural changes that keep the dwelling the same size, unless an overlay requires one Required on lots under 300 square metres; overlays can add triggers on any lot Follows the addition, so check lot size and overlays first
Building permit Likely, once structural walls move Required unless an exemption applies Required unless an exemption applies
What it costs the site Nothing: garden, setbacks and neighbours untouched Garden, sun and setback room Less than a full addition
The answer when Every need finds a room once walls move Needs are left over after the plan is solved One or two needs are left over

Two Melbourne houses, two different answers

Harvey Street, Malvern: the answer was inside the footprint. The house had a deeply compartmentalised layout, with light trapped in individual rooms and a dark, underused middle. We selectively removed load-bearing partitions to create one kitchen, dining and living core, then introduced a repeated sequence of arched openings so the rooms stayed defined while daylight travelled across the plan. No new wing was needed: the house had the floor area, and the plan was what let it down. The finished rooms are on our Harvey Street project page.

Altona: the answer was mostly inside the footprint. A typical 1960s triple-fronted brick veneer house, untouched for 60 years, had to fit a growing young family on a modest budget, with more bedrooms and bathrooms and no full demolition. We enclosed an underused rear patio as the new lounge and dining room, with clerestory windows bringing in northern light, which freed the original living room to become a fourth bedroom with an ensuite. Three bedrooms and one bathroom became four and two, as the Altona Transformation project page sets out. The addition was the smallest piece of the job and the reconfiguration did the heavy lifting.

Builder, draftsperson, surveyor, architect: who does what here

Several people can help with this decision, and each does a different job.

  • A builder prices and builds the work. Ask one for a cost reality check early, and for a firm quote once drawings exist.
  • A building designer or draftsperson documents plans for permits. On a settled brief and a simple site, that can be all the design help you need.
  • A registered building surveyor issues the building permit, the written approval Consumer Affairs Victoria describes, before any structural wall comes out.
  • A town planner prepares and argues a planning application where an overlay, Clause 54 or a contested site makes planning the hard part.
  • Barbara Yerondais, a fixed-fee renovation and extension architect, works on the question before all of that: whether your house is short on plan or short on area, and what the block, the planning rules and the budget will hold before anyone draws. Her answer becomes the brief the builder prices, the surveyor permits and, where needed, the planner argues.

Spend the first design dollars on this question

The worst time to discover you briefed the wrong project is after documentation, when drawings, engineering and permit work are paid for. Under Barbara Yerondais’s staged, fixed-fee method, the fee is fixed before design begins and the early stages answer the footprint question before the later ones document anything. Schematic design comes first. Then you see two options side by side, one showing what your budget achieves and one showing what the full wish list would cost, with a shopping list between them so the scope is your decision. That is where an extension either earns its place or drops out. On a smaller job, a fixed architect’s fee can look large against the build, and she will say so before you sign anything.

Start with a free, no-obligation call. Barbara rings you herself to talk it through and see whether the practice is the right fit, whether your answer turns out to be a few walls or a new wing. If it is a fit, the next step is a one-hour Feasibility Session with Barbara Yerondais, FRAIA, in person or on Zoom. You’ll talk through your site, budget and planning timelines, and leave knowing what’s realistic and what your next step is. There’s no obligation to go further. Bring your property report, your existing plan and the list of needs from test one.

Closing

If every need on your list finds a room once the walls move, reconfigure and keep the garden. If needs are left over, add on, but only by as much as is left over, and only in the form your lot, zone and overlays will accept. For more on how we approach additions, see our page for home extension architects in Melbourne, or our renovation architects page if your answer stays inside the footprint. Then talk to Barbara and bring the plan to the table.

Frequently asked questions about reconfiguring or extending

Q: Do I need a planning permit to reconfigure the inside of my Melbourne house?

A: Often not. In the General Residential Zone, Clause 32.08 says no planning permit is required for structural changes to a dwelling as long as its size and the number of dwellings do not increase, and Clause 62.02-2 exempts internal rearrangement on the same terms unless the scheme specifically requires a permit. A heritage overlay can change that: Clause 43.01 needs a permit for internal alterations where its schedule lists internal controls for the property, and for most external changes. You will usually still need a building permit once structural walls move.

Q: Is reconfiguring always cheaper than extending?

A: Not always, and there is no reliable Melbourne-wide figure that compares the two like for like. Reconfiguring avoids new footings, roof and external walls, but it concentrates work in the kitchen, bathrooms and structure, which are among the costliest parts of any house. An extension adds new floor area but can leave the existing rooms largely alone. The honest comparison is your two options priced side by side, which is what Barbara Yerondais’s staged, fixed-fee process is built to produce.

Q: Can we reconfigure now and add on later?

A: Yes, and for some households that is the right sequence, especially when the budget or the planning path favours doing the plan first. The trick is to design the reconfiguration knowing where a later addition would go, so today’s kitchen, stair or bathroom does not sit exactly where tomorrow’s connection needs to be. Planning rules can change between stages, so check your property report again before stage two.

Q: What happens on the free call and in the Feasibility Session?

A: The call is a conversation with Barbara to see whether the practice is the right fit for your house, with no obligation. If it is, the one-hour Feasibility Session is in person or on Zoom with Barbara Yerondais, FRAIA. You talk through your site, budget and planning timelines, and leave knowing what is realistic and what your next step is. There is no obligation to go further.

Who is giving this advice

Barbara Yerondais, FRAIA, a fixed-fee renovation and extension architect, brings more than 35 years in practice to that first conversation, and BY Projects Architecture has delivered more than 400 projects across Victoria, renovations and extensions among them. We would rather find your missing room inside the house you already own than draw one you did not need.

Citations

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About the Author

Barbara Yerondais, FRAIA, is the founder of BY Projects Architecture. With 35+ years of experience, she specializes in sustainable, community-focused design and heritage restoration. A dedicated mentor and rower, Barbara balances her high-impact Melbourne practice with a passion for social inclusion and passive, energy-saving design.

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