We get asked versions of this constantly, but rarely with this much justified indignation.

He is 41, owns his home and one investment property, and bought a block in a greenfield estate

intending to build. He put it precisely: "I've been convicted on suspicion."

Here is what happened to owners in his situation. A planning authority applied an overlay

across an entire precinct — about 250 lots — on the basis that the land may be at **high or

medium risk of potential contamination**. Not confirmed. Potential. No building permit can issue,

and no works can start, until an environmental audit or a preliminary risk screen assessment is done.

One owner found out from his builder — he already had plans approved, soil tests done and a signed

building contract. The assessment he needed was quoted at up to $80,000.

At a public rally, a political figure told the crowd the overlay had **"literally stolen $150,000 out

of your pocket."** That number needs care — it is a claim made in a political setting, not a

valuation. But the direction is not disputed. A block you cannot build on until an expensive,

open-ended process finishes is worth less than one you can.

His question: "How does an entire estate get repriced for something nobody has found?"

The part that makes owners angriest

The environment regulator was asked whether the overlay had been correctly applied and could be

reduced or removed. Its answer, in substance: based on the information available, it was **unable to

draw definitive conclusions about the level of contamination**, and therefore unable to recommend

whether the overlay should stand.

Meanwhile the council's own chief executive said there was **no evidence of contamination in the

soil, and appointed an auditor with the stated goal of getting the overlays removed**.

So: the mapping was applied, the regulator could not confirm the problem, the council did not

believe there was one, and the owners paid for it anyway. The trigger was historical — a consultant

report years earlier had flagged **introduced fill or stockpiled soil, potential mine waste, and

storage of waste material or scrap** on some of the lots.

Read that again. On some of the lots. The overlay went over all of them.

The two documents are drawn at different scales

This is the whole answer, and almost nobody sees it.

The overlay is a planning instrument, drawn across an area — a precinct, a corridor — because

planning controls are administered spatially. It is a flag saying *someone should look here before

anything gets built*.

The assessment that resolves it is drawn somewhere else entirely. In the regulator's own process,

each statement usually aligns with existing or proposed title boundaries.

And critically: one investigation may produce more than one statement — an auditor can conclude

that one part of a site requires a full audit and another part does not. The published purpose of

these assessments on subdivided land is, in plain terms, to **separate the areas that need an audit

from the areas that don't.**

So the state does not actually believe land inside an area behaves consistently. Its own instrument

assumes the opposite — that you go title by title to find out. The owners were repriced at **precinct

resolution and can only be un-repriced at lot resolution**. That asymmetry is the entire loss.

There are three outcomes: contamination unlikely, no audit; likely but no audit required because

there is no risk of harm for the proposed use; or likely and an audit required. Two of the three let

you get on with it. And the result is only valid for the specific land use assessed — a finding for

a house is not a finding for a childcare centre.

Why this is a street-level question

Contamination does not distribute itself evenly across a postcode. It sits where something happened

— a shed, a workshop, a fuel tank, a fill dump, a burn pit, a wash bay. In the regulator's own worked

example of an industrial site, the investigation found affected soil near the boundary, the

question being whether it was migrating next door. Boundary resolution.

Two blocks on one street, sharing postcode, median, council and catchment, can carry entirely

different histories, because a century ago one had a building on it and the other was paddock. A

median averages the block that was a depot with the block that was never anything. It is the same

failure we've written about with

a subdivision approval that sent an owner's equity backwards

and a $210,000 renovation that added nothing because the street had a ceiling

— the suburb was researched, the site was not.

And there is a rule buyers discover too late: **the duty to manage contaminated land applies to you

even if you did not cause the contamination.** It attaches to whoever manages or controls the land —

owner or tenant. Fault is irrelevant. It transfers on settlement, with the keys.

What to actually do

One: look up the history of the specific address before you buy. At least one state now publishes

a free public map combining the priority sites register, licensed sites, completed audits and

assessments, groundwater restriction areas, current and historical landfill locations, the audit

overlays — and digitised business directories running from 1896 to 1974, which until recently

existed only in hard copy on a library shelf. You can look up what operated at your address a century

ago. Free, minutes, and skipped almost universally.

Two: read the assessment, not the overlay. If a statement has been issued, whoever controls the

site must hand a copy to anyone taking over control. Ask for it. Completed audits sit on a public

register.

Three: price the process, not the fear. These assessments take weeks to months depending on site

size and history. On an overlaid block the real cost is the assessment plus the delay plus the carry —

estimable before you commit, rather than discovered after. Get that advice before the contract.

Every owner in the worst position had already committed.

What it means if you own property

A market that reprices land on suspicion is not an argument against owning property. It is an

argument against owning property you have not investigated — because the mapping keeps getting

better, and better mapping does not create risk. It removes an information advantage from whoever

hadn't looked.

There is real opportunity in the asymmetry. Land discounted by an area-wide flag, where a

title-level assessment comes back clean, is mispriced in your favour — and that assessment is

available to any buyer willing to pay for it. It is the trade the market keeps handing to people who

work at lot resolution while everyone argues about the precinct.

**Nobody tested his soil. They tested his neighbourhood's history — then priced his block as though

the two were the same thing. They never are.**

*This article is general information only and does not take into account your personal objectives,

financial situation or needs. Consider professional advice before making any investment decision.*