Four Types of Property I Refuse to Let Clients Buy. No Matter the Price.

I have a short list. Four items. If a property triggers any one of them, I tell clients to walk. Not "think about it." Not "maybe negotiate a discount." Walk.

These four property types look normal from the outside. Some look beautiful. Freshly painted, landscaped front yard, sparkling kitchen. And that is precisely why they trap people.

The most expensive mistake in property is not overpaying by $20,000. It is buying a property with a hidden structural deficiency that costs $50,000 to $150,000 to fix—or that permanently caps your asset's growth potential.

I am a trained actuary. I price risk for a living. Here are the four risks I will not accept at any price.

Flood overlay properties

The vendor will tell you they have lived there for fifteen years and never seen water. That is not the point.

The point is the insurance. A property in a high-risk flood zone (marked as LSIO or SBO on the council's planning overlay) can attract home insurance premiums of $7,000 to $30,000 per year, according to the Insurance Council of Australia 1. A comparable property in a low-risk zone? The flood component adds less than $20 to the annual premium.

That is a $7,000-$30,000 annual holding cost that never goes away. Every year, for as long as you own the property.

Banks are also wary. Properties with flood overlays frequently receive lower valuations because the assessor factors in the overlay risk. Lower valuation means less borrowing capacity, which means the next buyer faces the same constraint when you try to sell. Your buyer pool shrinks. Offers come in lower 2.

Before purchasing any property, check VicPlan for planning overlays. If you see "Land Subject to Inundation Overlay" or "Special Building Overlay," pause. Not all flood zones are equal—some are minor drainage overlays that have negligible practical impact. Others are full inundation risk areas where the council will impose severe building restrictions. The distinction matters, and your conveyancer or buyer's agent should be able to interpret it.

But as a default rule: if the house sits in a high-risk flood zone, the maths does not work. Period.

Properties with easements through the middle

An easement is a strip of your land that somebody else has the right to access. Usually a council or utility provider, for drainage pipes, sewer lines, or power cables. The land is technically yours. You pay rates on it. But you cannot build any permanent structure on it 3.

Drainage easements are typically 3-6 metres wide. If the easement runs along the back fence line, the practical impact is minimal—you lose a few metres of backyard that you probably were not going to build on anyway.

But if the easement cuts through the middle of the lot, you have a serious problem. It divides your usable land into two sections, neither of which may be large enough for meaningful development. Want to add a granny flat out the back? If the easement sits between the house and the planned granny flat location, the council will not approve construction over the easement.

I have had multiple clients approach us with plans to add a granny flat for dual income. The first thing we check is the plan of subdivision in the Section 32 for easement locations 4. If the easement position kills the development potential, the entire investment thesis collapses. You paid a premium for a large block of land, but a chunk of it is permanently unusable.

Check the Section 32 before you fall in love with the property. The easement information is right there in the plan of subdivision.

Asbestos (with a critical nuance)

Any house built before 1990 in Australia has a realistic chance of containing asbestos-containing materials. Eaves boards, bathroom wall panels, floor tile adhesive, roofing tiles—it was used extensively because it was cheap, durable, and fire-resistant 5.

Intact, undisturbed asbestos is not dangerous. It sits there doing nothing. The danger arises when you renovate. Cutting, drilling, sanding, or demolishing asbestos-containing materials releases microscopic fibres that cause serious respiratory disease. Professional removal starts at $10,000 and can reach $30,000 or more for large-scale projects 6.

Here is the nuance that most commentary misses: asbestos is a good material. It is fire-resistant and durable. The problem is specifically exposed, damaged, or disturbed asbestos. In a pre-1990 house where the asbestos is sealed behind paint, encapsulated in flooring, or sitting in intact roof sheeting, it poses no health risk during normal occupation.

Our investment strategy centres on established homes where the land value dominates—typically 80%+ of the purchase price. These are older houses. Many contain asbestos. We buy them anyway, because we are buying the land, not the building. Our renovation approach is deliberately minimal—paint, flooring, fixtures—and we ensure the building inspector confirms that all asbestos-containing materials are intact and undisturbed before proceeding 7.

The red flag is not "this house contains asbestos." The red flag is "this house requires major renovation that will disturb asbestos." If your investment plan involves gutting the interior, replacing walls, or demolishing sections of the building, the asbestos removal cost must be factored into your feasibility analysis. For our typical light-touch renovation strategy, asbestos is manageable.

But for the DIY renovator planning a weekend demolition party: stop. Get a hazmat assessment first.

Cosmetic flip properties

This is the most deceptive category. And it catches experienced investors, not just beginners.

A flip property is one that was purchased cheaply, given a superficial cosmetic renovation—fresh paint, new kitchen handles, vinyl plank flooring, trendy light fixtures—and re-listed within six to twelve months at a significant markup 8.

The problem is not the renovation itself. The problem is what the renovation hides. Behind that fresh coat of paint might be water damage, mould, or termite tracks. Under that new flooring might be cracked tiles and subfloor moisture. The plumbing has not been touched. The electrical has not been touched. The waterproofing in the bathroom has not been redone.

The flipper's business model depends on minimising spend. Every dollar they save on genuine structural remediation is a dollar of profit. They are not investing in the property. They are decorating it for sale.

How do you identify a flip? Check the property's sales history on realestate.com.au or pricefinder.com.au. If it sold within the last twelve months and is now relisted at a 20%+ premium, it is almost certainly a flip. The vendor is the flipper.

I am not saying renovated properties are automatically bad. I am saying that any property that changed hands recently and received a cosmetic makeover demands extra scrutiny. Get your own building inspector—never use the vendor's recommended inspector. Check the switchboard (is it the original 1970s unit?). Check the hot water system age. Check the roof tiles. If the cosmetics are new but the infrastructure is original, you are paying the flipper's margin for work that was not done.

"The most expensive house is not the one with the highest price tag," says Yan Zhu. "It is the one where you discover the real cost six months after settlement. Flood overlays, easements, asbestos surprises, and flip cover-ups account for more investor losses than market downturns ever have."

The bottom line: due diligence is not optional

These four categories share a common thread: the cost of the mistake does not appear on the contract of sale. It appears later. In insurance premiums that compound annually. In development applications that get rejected. In removal quotes that make your stomach drop. In repair bills for problems that were painted over.

The fix is straightforward. Before you sign anything:

1. Check VicPlan for overlays (flood, heritage, vegetation, bushfire).
2. Read the plan of subdivision in the Section 32 for easement positions.
3. Commission an independent building and pest inspection ($500-$600).
4. Check the property's sales history for recent flipping activity.

Four checks. Under $1,000 in total cost. Against a purchase of $600,000 or more.

The cheapest part of buying property is the due diligence. The most expensive part is skipping it.

I am Yan Zhu, actuary and buyer's agent in Melbourne. I do not sell property. I only help buy it.