The single best 60-second due-diligence move

Most pre-purchase due diligence is over-engineered. Buyers assume that thorough investigation requires hours of professional consultation. For most properties at most stages, it does not. The single highest-leverage 60-second move catches 70% of what a paid professional would surface, free of cost, available to anyone with internet access.

This post is the 60-second move. The shortest possible route from "I am looking at this property" to "do I want to dig deeper?"

The move

Type the property address into the planning portal of the relevant state. Open the layered view. Scroll through the hazard and constraint overlays one by one.

For NSW

The NSW Planning Portal at planningportal.nsw.gov.au includes a Spatial Viewer that overlays:

• Zoning
• Heritage items and conservation areas
• Flood planning area
• Bushfire prone land
• Coastal hazard
• Acid sulfate soil
• Biodiversity values
• Transport noise corridors (for major roads/rail)

For each address, the viewer shows a map with the lot highlighted and each overlay as a polygon. The check takes 60-90 seconds for a buyer reasonably familiar with the interface.

For Queensland

Brisbane City Plan online mapping (Brisbane), Gold Coast City Plan mapping (Gold Coast), or the relevant LGA's planning scheme map for other QLD councils. The QLD State Planning Policy mapping at qspatial.information.qld.gov.au covers state-level overlays (bushfire, coastal, biodiversity).

For Victoria

VicPlan at mapshare.vic.gov.au/vicplan returns the planning controls and overlays for any Victorian address.

For other states

SA: SAPPA (planning.sa.gov.au) WA: PathWest planning portal TAS: ListMap at planning.tas.gov.au ACT: ACTmapi

Each state has a free online planning portal. The interface and the layer list vary. The principle is identical: enter an address, see the overlays.

What the 60-second move surfaces

After 60-90 seconds, you have answers to:

Answer 1: zone

What zone is the lot in? Residential, commercial, mixed-use, rural? The zone tells you the dominant permitted use.

Answer 2: any heritage or character overlays

Is the lot or surrounding area protected? Heritage-listed individually or in a conservation area?

Answer 3: any hazard overlays

Flood, bushfire, coastal, landslip, acid sulfate. Each is a polygon. You can see whether the lot is inside, adjacent, or clear.

Answer 4: any biodiversity or environmental overlays

For lots near bushland, rural-residential, or peri-urban, the biodiversity and vegetation layers may apply.

Answer 5: any specific overlays (transport noise, coastal, infrastructure)

Some lots have specialised overlays that affect what can be done.

What the 60-second move does NOT surface

Three things that require more time:

Limitation 1: build envelope

The 60-second move tells you the overlays. It does not compute the buildable envelope under setbacks, FSR, height limits, and site coverage. That requires reading the LEP / Planning Scheme in detail (10-30 minutes for the 60-second LEP read covered in a separate post).

Limitation 2: specific clauses and conditions

Each overlay has its own clauses, conditions, exemptions, and pathways. Knowing the overlay applies is the first step. Understanding what specifically it requires for your intended project takes more reading.

Limitation 3: physical condition

The planning portal shows planning data, not physical condition. A building inspection is a separate exercise.

Why this move is high-leverage

Three reasons:

Reason 1: cost is zero

The planning portals are free. No login required for the public layers. No fees.

Reason 2: time is minimal

60-90 seconds per address. A buyer screening 10 properties can run the check on all 10 in 15 minutes total. The throughput supports active property searching.

Reason 3: information density is high

The visual output (lot with overlay polygons drawn on it) is denser than reading the same information in text form. A buyer who looks at the visual immediately understands the spatial implications of any overlay.

How to make the move a habit

Three practical steps:

Step 1: bookmark the relevant portal

For the state(s) you are actively searching in, bookmark the planning portal. Bookmark the specific spatial viewer page if possible. Eliminate any friction between deciding to check and starting the check.

Step 2: develop a personal layer checklist

Decide which overlays you will always check. For most residential buyers, the list is:

• Zone
• Heritage / character
• Flood
• Bushfire
• Acid sulfate (coastal areas)
• Biodiversity (rural-residential or bushland-adjacent)

The checklist runs in 60-90 seconds for any address. The check becomes automatic.

Step 3: integrate into your property search workflow

Before any inspection. Before any further research. Before any agent contact. Run the 60-second check first. The check tells you whether the property is worth the broader investment of time.

What to do after the 60-second move

Three branches:

Branch 1: clean of overlays

No significant hazards, no heritage, no obvious constraints. Continue with broader due diligence: inspection, financials, suburb research. The 60-second check has not revealed any showstoppers.

Branch 2: one or two overlays present, manageable

The lot has flood overlay on the rear quarter, or bushfire BAL-12.5. Manageable but adds cost and design constraints. Continue with broader due diligence but factor the constraints into your offer.

Branch 3: multiple overlays or severe constraints

The lot has heritage character + bushfire BAL-29 + landslip overlay. Significant constraints layered. May still be a viable purchase but the cost and complexity are materially higher. Decide whether the lot still fits your goal before investing further time.

The advantages of SafeBuy over a manual 60-second check:

• Federal heritage and EPBC layers (not always on state portals)
• Council-specific overlays for the council we cover
• Solar API analysis
• Financial calculator
• Business Pulse data
• All 8 reports for the same address in one place

The cost: $23 per property unlock, or $99.99/mo for 100 unlocks on the Pro tier.

For a buyer running active property searches with 5+ shortlist properties, SafeBuy is faster and more comprehensive than the manual planning portal checks.

For a buyer screening properties more lightly, the manual 60-second move on each state portal is still the highest-leverage free move available.

The principle

Most due diligence advice over-emphasises depth. The 60-second move trades depth for breadth: cover every property quickly, then invest depth only where the quick check has not revealed showstoppers.

The breadth-first approach catches deal-breaker overlays before you have spent hours on a property that should have been ruled out in the first minute. The depth-first approach often wastes professional fees on properties that the 60-second check would have eliminated.

Sixty seconds. Free. The cheapest insurance available against an expensive mistake.