Buy and renovate a Mornington Peninsula home, or walk away?

By Barbara Yerondais
Oct 22, 2026

Answering: Should we buy and renovate this existing Mornington Peninsula home, or walk away?

Estimated reading time: 16 min read

Buy and renovate an existing Mornington Peninsula home only when five checks pass before you sign a contract: the overlays on that exact lot, the permits behind any past extension, the condition of the house, the ground it sits on, and whether your budget can carry the brief you actually want. If one of them fails and cannot be priced before settlement, walk away, however good the listing photographs look. Barbara Yerondais, a fixed-fee renovation and extension architect with 35+ years in practice, runs this read with buyers before the big commitment, and her practice, BY Projects Architecture, brings a record of 400+ projects across Victoria to it.

Picture the Saturday inspection. You are standing in a Mount Martha living room with the sliding doors open. The house photographs well, the agent has mentioned twice that there is no heritage overlay, and someone in your group has already decided where the new deck goes. What the listing cannot tell you is whether the block, the shire’s controls and your budget still add up once someone who reads the planning scheme and the structure has looked properly.

The stakes run both ways. Exchange without that read and you can lock serious money into a block that cannot deliver the life you planned without over-capitalising, or into a permit path nobody priced. Walk away without a framework and you can pass on a workable house for the wrong reasons. The questions below run in the order buyers should ask them.

Key Insights

  • No Heritage Overlay is a good start, never a clean bill: on the Mornington Peninsula a design overlay, vegetation protection or the interim landslide overlay (EMO7) can still put an extension, earthworks or tree removal into the planning permit net.
  • In the Shire’s Coast and Landscape Design overlay (DDO3), an extension to an existing house needs a permit if it sits on a slope over 20 per cent or a ridge, has a wall over 5.5 metres or a building over 6 metres, or needs more than 1 metre of cut or fill.
  • The Shire calls its flood map indicative only and points owners to a Building Regulation 51(2) Property Information Certificate and a site survey. The whole peninsula is deemed termite prone.
  • If the house was renovated or extended, Consumer Affairs Victoria says to check the Section 32 statement and ask council whether permits were obtained, because illegal alterations may become yours once you sign.
  • Barbara Yerondais fixes the design fee from day one, smaller renovations are welcome, and the first step is a free, no-obligation call.
What you find before you sign What it usually means Our read
Zone only, no overlays that bite, permits on file, sound structure The house can probably carry a renovation; your brief and budget decide the scope Buy, then design
A past extension with no permit record Unauthorised work can become your responsibility once you sign Investigate before you bid, or negotiate on price
Land inside the interim EMO7 landslide overlay Development, including vegetation removal, may need a permit and geotechnical information Price the reports first, then decide
A DDO3 lot on a slope over 20 per cent or a ridge An extension is likely to need a planning permit Buy only if your timeline can carry a permit
Flood-liable land on the 51(2) certificate Your building proposal needs extra assessment Confirm with a site survey before you commit
A brief that needs more than the controls allow, and no budget slack The renovation you want is not one this house can give you Walk away

Table of Contents

Does a house with no heritage overlay still need a permit to extend?

Often it does, which is why planning timelines are one of the three things you talk through in a one-hour session with Barbara Yerondais, alongside your site and your budget. The Mornington Peninsula Planning Scheme layers zones and overlays across the whole shire, and the Shire’s guide to planning zones and overlays shows how many of them reach an ordinary house. The controls that most often decide a renovation on existing peninsula stock are these:

  • Coast and Landscape Design (DDO3). It generally applies to coastal villages, hillsides and clifftop areas. An extension or alteration needs a permit if it misses the general requirements: a slope over 20 per cent or a ridge, a wall over 5.5 metres or a building over 6 metres, more than 1 metre of cut or fill (pools excepted), a front setback under 7.5 metres, or light, reflective cladding.
  • DDO5. A permit is required for any building or works, including extensions and alterations to existing houses.
  • Vegetation Protection Overlay. Removing, destroying or lopping protected vegetation generally needs a permit, and the Shire warns that this can include groundcover and shrubs.
  • The interim EMO7. A temporary Erosion Management Overlay for landslide-prone land. Amendment C314morn, approved on 19 October 2026, cut the properties it covers from about 33,000 to about 6,000, so check the current map, not what a neighbour remembers.

Not every control tightens. In the Green Wedge Zone, the Shire lists renovations or small extensions to an existing house among the things that might not need a permit, while a new dwelling may. That difference alone can decide whether you extend the house you are buying or start again.

Find out before the second inspection. The Shire’s MyLot service and its online mapping tool show the zones and overlays on a lot, and the Shire recommends confirming with council that its advice applies to your property. If the lot does carry a Heritage Overlay, our guide to renovating a heritage home on the Mornington Peninsula takes over from here.

What should you check about the house and the ground before you sign?

Start with the paperwork behind the house. Consumer Affairs Victoria’s advice to inspect properties before you buy is direct: if the property has been renovated or extended, check the Section 32 statement and contact the council to find out whether planning or building permits were obtained, because illegal alterations may become your responsibility once you sign. On the peninsula, where plenty of weekenders grew a room at a time, that check matters.

Then look at the house itself. The same guidance suggests engaging a qualified building inspector, surveyor or architect for a written building inspection report before you sign, one that flags unsafe or unauthorised work and gives you grounds to negotiate. It also recommends an asbestos assessment for homes built before 1990 and a pest inspection.

The ground deserves the same care, and on the peninsula it carries three questions of its own:

  • Termites. The Shire states that the whole of the Mornington Peninsula is deemed termite prone, so treat the pest inspection as essential.
  • Flooding. The Shire’s flood prone maps are indicative only. It says to obtain a Property Information Certificate under Building Regulation 51(2) to confirm the land’s designation, and a site survey to verify the contours.
  • Landslip. Where the interim EMO7 applies, the Shire’s landslide susceptibility page says you might need a permit before developing, including removing vegetation, and that a landslide risk assessment report will be required in many cases.

Coastal exposure is a design input everywhere on the peninsula, overlay or not: salt, wind and maintenance decide which materials last. On a steep block, our piece on building or extending on a sloping or difficult site goes further.

How do you tell whether the budget and the block still add up?

Write the brief before you price anything. List what the house has to do every day for your household: where you will work, who visits and how often, what a winter weekend looks like, what the garden is for. A weekender becoming a permanent home needs a different house from the one it was built to be, and that gap is usually where the money goes.

Then set a ceiling that covers more than the build. Reports, surveys, permit fees and design all belong in it, and a lot inside EMO7 or a flood designation adds reports that a flat suburban block never needs.

This is where Barbara Yerondais’s staged fixed-fee method earns its place. She fixes the design fee from day one, then stages the work: schematic design comes first, followed by two sketches, 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 stays your decision. You see the gap between dream and budget before documentation, not at tender. Our piece on what fixed-fee cost certainty really buys you sets out the same discipline.

Fixed fees are honest about smaller jobs too. On a modest renovation a fixed fee can look high against the build, and Barbara says so before you commit. Smaller jobs are still welcome. For the full approach to existing homes, see our page on renovation architects in Melbourne.

When is walking away the right answer?

Walking away is a legitimate outcome of good due diligence, and Barbara Yerondais would rather you reach it before you sign than after: the point of the first conversation is to leave knowing what’s realistic and what your next step is. Four situations point that way:

  1. The problem sits in the ground or the controls, and cannot be priced before settlement. A landslip overlay that needs geotechnical work, or a flood designation over the footprint you need, can turn a renovation budget into a reports budget.
  2. Past works have no permits, and the vendor will not deal with them. You would be buying someone else’s compliance problem at full price.
  3. Your brief only works with height, earthworks or vegetation removal the controls resist. If a second storey breaks the DDO3 height trigger and your timeline cannot carry a permit, the house you want is not this one.
  4. The numbers leave no room for the brief. If the purchase price plus a realistic renovation leaves you over-capitalised for the years you plan to stay, the honest answer is a different house.

A good buy has a shape too: the problems are inside the walls and priceable, the overlays are known and a design can work within them, and the brief fits the block. Sometimes the right answer is a knock-down; our guide to renovating or rebuilding a post-war home walks through that call, and our piece on custom new homes in Melbourne and on the Peninsula covers building new.

Who reads what before you sign?

A peninsula purchase usually involves several professionals, and each reads a different part of the decision:

  • Your conveyancer or property lawyer reads the contract of sale and the Section 32 statement.
  • A building and pest inspector reports on condition, defects, termites and unauthorised work.
  • A land surveyor fixes levels and contours, which the Shire asks for on flood questions.
  • A geotechnical engineer assesses landslide risk where EMO7 applies.
  • A town planner can take a complex permit application through council.
  • A builder prices and builds the work once there is a design to price.
  • A registered building surveyor later issues the building permit, which comes only after any planning permit, as Consumer Affairs Victoria’s guide to building plans and permits explains.

Barbara Yerondais works alongside all of them. Her part is reading the block, the shire’s controls, the house and your budget together, before anyone draws, then designing and documenting the renovation as a registered architect on a fixed fee. Our booking form even lists “Pre-purchase feasibility” as a project type.

The first step is to talk to Barbara. A free, no-obligation call comes first, and Barbara rings you herself. If the project is a fit, the Feasibility Session follows: in one hour 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. Why that hour belongs before any design contract is set out in what one hour settles before a renovation design contract.

Closing

The best peninsula renovations start with a purchase made with open eyes. Pass all five checks and you are buying a house you can grow into. Fail one you cannot price and walking away is a win. Read our page for architects on the Mornington Peninsula. Barbara Yerondais brings 35+ years in practice to that read, and BY Projects Architecture has delivered 400+ projects across Victoria. Pull the lot’s overlays before the next inspection, then talk to Barbara.

Frequently asked questions before you buy on the Peninsula

Q: Do I need a planning permit to extend a Mornington Peninsula house with no heritage overlay?

A: It depends on the zone and overlays on that lot. In the Coast and Landscape Design overlay (DDO3), an extension needs a permit if it misses the general requirements, such as a slope over 20 per cent, a ridge location, a wall over 5.5 metres, a building over 6 metres or more than 1 metre of cut or fill. In DDO5 any building or works need one, and removing protected vegetation or building in the interim EMO7 can also trigger a permit. In the Green Wedge Zone, a renovation or small extension might not. Check the lot on the Shire’s MyLot service.

Q: Should an architect look at a Peninsula house before we buy it?

A: If you plan to renovate or extend, it helps. Consumer Affairs Victoria suggests a qualified building inspector, surveyor or architect for a building inspection report before you sign. A building and pest inspection tells you what is wrong with the house; an architect who reads the overlays, the slope and your brief tells you what the house can become, and roughly whether your budget gets you there. BY Projects lists pre-purchase feasibility as a project type.

Q: How do I check flood and termite risk on a Mornington Peninsula property?

A: The Shire says its flood map is indicative only, so order a Property Information Certificate under Building Regulation 51(2) to confirm whether the land is flood-liable, and a site survey to verify the contours. The same certificate notes termite risk, and the Shire states that the whole peninsula is deemed termite prone, so a professional pest inspection belongs in every purchase. In most cases you will need the certificate for a building permit anyway.

Q: Is our renovation too small for BY Projects Architecture?

A: No, and smaller jobs are welcome. Our booking form lists a “Smaller renovation or alteration” project type and an “Under $500k” budget band. If a fixed fee looks high against a small build, Barbara will say so before you commit. Start with a free, no-obligation call, and Barbara rings you herself to talk it through. If it’s a fit, the one-hour Feasibility Session follows, in person or on Zoom.

Citations

TALK TO BARBARA
SEE OUR PROCESS →

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.

INDEX

Start the Conversation

Every project begins with a deep inquiry into site, heritage, and vision. Let’s discuss the strategic potential of your next work.

SCHEDULE A FEASIBILITY SESSION →

A PRELIMINARY CONSULTATION TO EVALUATE HERITAGE CONSTRAINTS, SITE POTENTIAL, AND PROJECT FEASIBILITY.