The 4 Checks: What You Must Do Before Calling a Real Estate Agent
The moment you call a selling agent to ask about a property, the information game is already stacked against you. That agent knows the vendor’s motivation, knows what comparable sales have done recently, knows whether there are other interested buyers, and knows exactly how much pressure they can apply to move you toward a decision. You know the listing price and what the kitchen looks like in the hero shot.
That is not a negotiation. That is an ambush.
Most investors fall into one of two traps before they make contact. They either over-research to the point of paralysis and never actually pull the trigger, or they under-research and walk into that first call completely blind. Neither approach serves them.
The 4 Checks framework is what we run at Property Principles before we ever pick up the phone on a property. It is a specific sequence of four filters, run in a deliberate order, designed to close the information gap before contact is made. If a property fails any one of the four checks, we do not call. We move on. That discipline protects our clients from chasing the wrong asset and from telegraphing interest to an agent before we know whether the deal is worth pursuing.
Here is how each check works and why the order matters.
Why does calling the agent first cost investors money?
Quick Answer: When you enquire before doing your own research, you hand the selling agent a significant information advantage. They can gauge your interest level, frame the property’s value before you have independent data, and apply pressure during negotiation. Skipping pre-engagement research is one of the most consistent and avoidable mistakes investors make. This information asymmetry is also one of the strongest arguments for having an experienced buyer’s agent in your corner.
Think about what happens in a typical enquiry call. The agent picks up, you ask a few questions, and they immediately ask how serious you are and whether you have finance pre-approved. Within two minutes, they know your urgency, your buying capacity, and your emotional state. You have revealed your hand before you have assessed the table.
According to CoreLogic data, properties in Australian capital cities sell within a median of 28 to 45 days depending on the market cycle. Agents in tighter markets are highly skilled at creating artificial urgency during that window. Going in unprepared hands them the tools they need to do exactly that.
The 4 Checks are what you run before that call happens. Think of them as your pre-flight checklist. Not the due diligence you do after signing a contract, but the minimum intelligence-gathering required before you even signal interest.
What is the 4 Checks framework and why does the order matter?
Quick Answer: The 4 Checks is a sequential due diligence framework used by Property Principles to filter investment properties before making agent contact. The checks run in a specific order: Location Grade, Supply and Demand Snapshot, Financial Fit, and Property-Level Red Flags. Each check is a binary gate. Pass all four, then you call. Fail any one, and you move on without wasting contact capital.
The order is not arbitrary. Each check builds on the one before it. There is no point running a detailed financial model on a property in a suburb that fails the location test. There is no point checking flood overlays on a property that already fails on vacancy rates. Running these in sequence saves time and keeps you from falling in love with a property before you have assessed whether the location actually deserves your attention.
Let’s run through each one.
Check 1: Does the suburb pass the investment-grade location filter?
Quick Answer: The first check screens the suburb, not the property. A strong property in a weak suburb will still underperform over time. This check uses the Property Principles 1% Filter to assess whether the location demonstrates the structural characteristics of an investment-grade market before any further analysis is done.
Location is doing roughly 80% of the heavy lifting in any investment property. That is not a marketing line. It reflects the reality that a median-quality home in a high-demand, supply-constrained suburb will consistently outperform a premium home in a flat or declining one. The suburb comes first.
The 1% Filter screens locations across several variables: population growth trajectory, infrastructure spend, employment diversification, owner-occupier to investor ratio, and historic median price performance over rolling five and ten-year windows. The target is a suburb where demand fundamentals are strong and supply is structurally constrained, not just currently tight.
In practice, this means we eliminate a significant majority of suburbs before we even look at a specific listing. The ABS 2021 Census data and subsequent updates show that fewer than 20% of Australian suburbs meet all of our investment-grade criteria simultaneously. That filter alone saves enormous amounts of wasted research time downstream.
If the suburb passes Check 1, you move to Check 2. If it does not, you stop and find another suburb.
Check 2: What does the supply and demand snapshot show?
Quick Answer: This check examines four real-time indicators: vacancy rate, days on market (DOM), stock on market, and absorption rate. Together they give you a current read on whether the suburb’s demand fundamentals are actually translating into market conditions that favour buyers or vendors. A suburb can pass the long-term filter but be in a short-term correction. Check 2 catches that.
Here is what each metric tells you:
| Metric | Healthy Signal (Investor Favourable) | Warning Signal (Proceed with Caution) |
|---|---|---|
| Vacancy Rate | Below 2% – strong rental demand, low supply of available stock | Above 3% – softening demand or oversupply of rental properties |
| Days on Market (DOM) | Below 30 days – vendors are not waiting, buyers are active | Above 60 days – properties sitting, potential price softening ahead |
| Stock on Market | Below long-term average – fewer properties competing for buyers | Above long-term average – buyers have more choices, less urgency |
| Absorption Rate | Above 20% monthly – new listings being absorbed quickly | Below 10% monthly – inventory building up, vendor pressure dropping |
A real example: I had a client send me a property in a regional Queensland market earlier this year. The suburb had solid long-term fundamentals and passed Check 1 comfortably. But when we ran Check 2, the vacancy rate had climbed to 3.4% and days on market had pushed out to 72 days. That combination told us the market had softened since the original research was done. We did not call the agent. We watched the market for another six weeks, picked up updated data showing absorption had improved, and then re-entered the process with much better price intelligence.
PropTrack data from late 2025 showed average vacancy rates across combined capital cities sitting at approximately 1.1%, but that national figure masks significant variation at the suburb level. Always check suburb-specific figures, not city averages.
Check 3: Does the deal fit the investor’s financial brief?
Quick Answer: Check 3 tests whether the property makes sense for this specific investor, not whether it is a good property in theory. It cross-references the listed price against the investor’s borrowing position, cash flow tolerance, and target yield band. A property can be objectively good but wrong for the investor’s current brief. The Deal Crunch Calculator runs this assessment before any agent contact is made.
This is where investors most commonly deceive themselves. They find a suburb they like, see a property that seems attractive, and start imagining themselves owning it before they have tested whether the numbers actually work. Then they call the agent emotionally invested, which is the worst possible negotiating position to be in.
Check 3 forces the financial question early. The inputs are:
- Estimated purchase price based on recent comparable sales (not the asking price)
- Expected gross rental yield for the property type and suburb
- Interest rate scenario based on the investor’s current loan structure
- Holding costs including rates, insurance, body corporate if applicable, and management fees
- Net cash flow position after all costs
The question Check 3 is answering is not “is this property good?” It is “does this property fit my brief?” Those are very different questions. A 4.8% gross yield on a house in a capital city growth corridor might be excellent for a cash-flow-focused investor with a high loan-to-value ratio, while the same deal might be entirely wrong for someone needing a stronger cash surplus to service existing debt. Understanding the distinction between rental yield versus capital growth strategy is critical at this stage.
If the deal does not clear the investor’s minimum financial thresholds, we do not call. We note the property and the reason it failed, and we move on.
Check 4: Are there any visible property-level red flags?
Quick Answer: Check 4 screens for deal-disqualifying risk signals that are visible from public data before any physical inspection occurs. These include flood and bushfire zone overlays, heritage listings, council zoning restrictions, strata sinking fund status, and proximity to planned or approved developments. Any single red flag that permanently limits the property’s use or future value is grounds for walking away at this stage.
Check 4 is not the full property-level due diligence. That happens after an offer is accepted or under a contract with conditions. What Check 4 does is screen for the obvious disqualifiers you can identify from your desk so you are not wasting time inspecting properties with fatal structural issues.
The signals we check at this stage:
- Flood and bushfire overlays: Available through council flood mapping tools and the NEARA bushfire risk datasets. A property in a high flood hazard zone has insurance implications, lender restrictions, and resale limitations that can destroy yield and capital growth simultaneously.
- Heritage overlays: State heritage registers and local council overlays can place permanent restrictions on what you can do with a property. A heritage-listed building with renovation potential on paper may have almost no development flexibility in reality.
- Strata sinking fund: For any unit, villa, or townhouse, a depleted strata sinking fund is a major red flag. A sinking fund below $1,000 per lot is a commonly used rule of thumb for inadequate reserves, though the right figure depends on building age and maintenance history.
- Neighbouring development: Check the council DA register for approved or pending developments on adjacent lots. A south-facing property with a six-storey approved development to the north is going to lose natural light, amenity, and potentially 10-15% of its resale value.
This check also screens for the less obvious risks that are easy to miss when you are caught up in the excitement of a listing. I have seen clients nearly purchase properties flagged as off-the-plan conversions masquerading as established stock, and properties with easements that permanently prevent any future development or extension. A quick search of the council planning portal takes 15 minutes and can save you years of headache. For a deeper look at the risks that come with newer stock, the off-the-plan property risks guide is worth reading before Check 4 if any of the listings you are assessing are less than five years old.
Pass all four checks and then you call the agent. Not before.
What happens after all four checks pass?
Quick Answer: Once a property clears all four checks, you make contact with the selling agent from a position of genuine information advantage. You know the suburb fundamentals, the current market conditions, the financial fit, and you have cleared the visible risk signals. That knowledge changes the tone and outcome of every conversation you have with the agent from that point forward.
When I call an agent after running the 4 Checks, I am not asking them to educate me on the market. I already know what comparable properties have sold for. I already know how long stock is sitting in that suburb. I know whether the vendor has priced the property fairly or whether there is room to negotiate. That shifts the entire dynamic of the call.
Agents respect informed buyers. More importantly, they cannot manufacture urgency with an informed buyer as easily as they can with someone walking in cold. When you ask a question that demonstrates you have done your homework, the conversation moves faster, the responses are more direct, and you are in a far stronger position when it comes time to negotiate the price.
The 4 Checks are the pre-engagement step. From there, once you are under contract, the deeper post-purchase due diligence kicks in. The full property due diligence checklist covers what happens after the 4 Checks pass and you have signed a contract, including building and pest inspections, title searches, strata reports, and legal review. That is where you validate what you already believe to be true based on the 4 Checks.
How long does the 4 Checks process take?
Quick Answer: For an experienced investor working with good data sources, all four checks can be completed in two to four hours per property. Check 1 and Check 2 take the most time initially, but once you have screened and approved a suburb, subsequent properties in that same suburb only require Checks 2, 3, and 4 – cutting the time significantly.
The first time you run the 4 Checks on a suburb, expect to invest around two to three hours pulling vacancy data, comparable sales, council overlays, and running the financial model. That time investment is front-loaded. Once you know a suburb and have a current read on its market conditions, assessing the next property that comes up in the same area takes closer to 45 minutes.
The time investment is also relative. Two to four hours of research before making contact is trivial compared to the time, money, and stress involved in recovering from a poorly researched property purchase. The average Australian property purchase costs between $500,000 and $900,000 in capital city markets, according to ABS residential property price index data from 2025. Spending four hours to protect a half-million-dollar decision is not optional. It is basic financial discipline.
What due diligence should I do before buying an investment property in Australia?
At a minimum, run Property Principles’ 4 Checks before making any agent contact: (1) assess whether the suburb passes an investment-grade location filter, (2) review current supply and demand indicators including vacancy rate and days on market, (3) test whether the deal fits your specific financial brief using modelled cash flow and yield, and (4) screen for visible property-level red flags including flood overlays, heritage listings, and strata sinking fund status. Full post-contract due diligence including building and pest inspections and legal review follows after an offer is accepted.
What checks do buyers agents do before purchasing a property?
A professional buyer’s agent runs location analysis, supply and demand assessment, financial modelling against the client’s brief, and a property-level risk screen before making any contact with the selling agent. At Property Principles, this pre-engagement protocol is called the 4 Checks. It ensures any property we pursue has already cleared a minimum standard across location quality, market conditions, financial fit, and visible risk signals before a single call is made.
How long does property due diligence take in Australia?
Pre-engagement due diligence using the 4 Checks framework takes two to four hours per property for an experienced investor with access to good data sources. Post-contract due diligence, which includes building and pest inspections, title searches, strata reports, and legal review, typically takes five to fifteen business days depending on the state and asset type. Attempting to compress the post-contract phase carries significant financial risk.
Do I need to do due diligence before or after signing a contract?
Both. Pre-contract due diligence (the 4 Checks) happens before you make any agent contact and gives you an information advantage going into negotiation. Post-contract due diligence is embedded in the contract conditions and covers building and pest inspections, title searches, legal review, and strata reports where applicable. Skipping the pre-contact phase means entering negotiation without the information needed to assess price and risk accurately.
What should I check about a suburb before buying an investment property?
Assess the suburb across five key dimensions: population and employment growth trajectory, infrastructure pipeline, owner-occupier to investor ratio, historic median price performance over five and ten-year windows, and current supply-demand indicators including vacancy rate and days on market. Strong performance across all five dimensions is what separates an investment-grade suburb from an average one. The Property Principles 1% Filter screens Australian suburbs against these criteria to identify investment-grade locations.
What is the minimum due diligence before making an offer on a property?
Before making any offer, you should have completed all four of the pre-engagement checks: location grade, supply and demand snapshot, financial fit test, and property-level red flag screen. Any offer made without completing these four steps is being made without a full picture of the property’s investment merit, and you are negotiating at a disadvantage. Minimum diligence is not a checklist item you can skip to move faster.
What are the most common mistakes investors make during due diligence?
The most common mistakes are: calling the agent before completing any independent research, relying on the agent’s comparable sales data instead of pulling your own, skipping the financial fit test and assuming a deal works without modelling it, and missing property-level red flags like flood overlays or depleted strata sinking funds that are visible from public sources. A second common trap is completing thorough due diligence on the wrong suburb entirely, having never run a proper location quality screen first.
How do I know if a property is investment-grade before I call the agent?
Run the 4 Checks in sequence. If the suburb passes the location filter, the current market data supports the fundamentals, the deal fits your financial brief, and there are no visible red flags from public data sources, the property has cleared the investment-grade threshold for pre-contact assessment. Full validation requires post-contract due diligence, but the 4 Checks give you high confidence before you ever signal interest to the selling agent.
Ready to have someone run the 4 Checks for you?
The 4 Checks framework works. But it requires reliable data sources, experience reading the signals correctly, and the discipline to walk away when a check fails even when a property looks appealing on the surface.
If you want a buyer’s agent to run the 4 Checks on your next property, book a free discovery call with Property Principles. We will assess your brief, review any properties you are considering, and tell you straight whether they are worth pursuing. No sales pitch. Just the data and an honest read on the deal.
