The Mistakes 99% of Property Investors Make (And How to Buy at Genuine Depth)

Let me save you a hundred grand right now. I'm going to run through the most common mistakes property investors make — the ones I see every single week — and explain what separates people who consistently make money from people who buy one property, have a miserable experience, and never invest again.

I've watched hundreds of investors go through this process. The ones who succeed share a handful of habits. The ones who don't share a different set. And the gap between those two groups — in dollar terms — is enormous.

Mistake 1: Buying on-market at advertised prices

Here's the first thing most investors get wrong. They go to realestate.com.au, find a property listed at $650K, attend the open inspection with forty other people, and put in an offer at $655K.

That's not investing. That's shopping.

The best deals in property almost never hit the public market. They come through off-market channels — agent relationships, expired listings, vendor distress, deceased estates. Properties where the seller wants a quick, quiet transaction without the circus of a public campaign 1.

When a property is listed on-market, you're competing against every buyer in the market. The agent is paid by the seller to maximise price. Every marketing dollar they've spent is designed to create competition and push the price up. You cannot buy at genuine depth in that environment. The best you'll do is pay market value. More likely, you'll pay above market value because auction pressure made you emotional.

We source around 60-70% of our acquisitions through off-market channels. Our scouts physically cover the southeast corridor every week — Cranbourne, Hampton Park, Narre Warren, Berwick, Frankston — building relationships with selling agents who know we'll move fast and settle unconditionally 2.

That access is why we bought a Boronia property at $660K that the bank valued at $890K four weeks later. The vendor wanted a quiet sale, the agent knew we'd perform, and there was no competing bidder to push the price up. That $230K gap between purchase price and bank valuation? That's the depth you can't achieve on-market 3.

Mistake 2: No exit strategy before you buy

The selling agent is not your friend. I know that sounds obvious, but most investors behave as if the agent helping them buy is also looking out for their long-term interests. They're not. Their job is to sell the property. Full stop.

No selling agent will tell you:

• What your exit strategy should be
• When to sell or refinance
• What the property will be worth in five years
• What hidden issues might suppress future growth
• What the true holding costs will be

They'll tell you the property is "great value" and that "there's a lot of interest." That's marketing, not advice 4.

Before you buy any investment property, you need to be able to articulate: Why am I buying this? What am I going to do with it? Under what conditions would I sell? What's my target hold period? What rent will it achieve and will that cover my costs?

If you can't answer all five, you're not investing. You're gambling with a very expensive chip.

We build a full investment thesis for every client acquisition. That includes a 30-point checklist covering affordability ratios, land value percentage, vacancy rates, comparable rents, renovation scope, refinancing timeline, and exit triggers. The thesis gets written before we make an offer — not after 5.

Mistake 3: DIY renovations that blow out timelines

This one kills me. I see it constantly.

An investor buys a property that needs work. Instead of engaging a professional team, they decide to do it themselves. "How hard can it be? I'll save $30K on labour."

Six months later, the kitchen is half-finished. The investor is exhausted. They're still paying the mortgage but receiving zero rent because the property isn't tenantable. And the "savings" on labour have been completely eaten by the holding costs they've accumulated during the blowout period.

Let me do the maths on a real scenario. Property purchased at $650K. Mortgage at 5.5% = $35,750 per year, or roughly $690 per week. Expected rent once renovated: $800 per week.

If the renovation takes four weeks with a professional team, the investor loses four weeks of rent ($3,200) and pays four weeks of mortgage ($2,760) = $5,960 in holding costs.

If the investor does it themselves and it takes seven months (which is generous — I've seen twelve months), that's 30 weeks of lost rent ($24,000) plus 30 weeks of mortgage payments ($20,700) = $44,700 in holding costs 6.

The "savings" on $30K of labour costs have been obliterated by $39K of additional holding costs. Net result: the DIY approach cost $9K more than hiring professionals. And the investor got seven months of stress and weekends with a paint roller.

Our in-house reno team turns properties around in two to six weeks depending on scope. Light cosmetic work (paint, flooring, blinds, garden): two weeks, $10K-$15K. Medium scope (kitchen update, bathroom refresh, external paint): four weeks, $25K-$40K. Structural work with council involvement: six to twelve weeks 7.

Every additional week of vacancy is a week of zero income and full costs. Speed is not a luxury — it's a direct contributor to your return on investment.

Mistake 4: Managing your own properties

The other thing investors try to do themselves — with equally bad results — is property management.

"Why would I pay a PM 7% of rent when I can do it myself?"

Because you can't. Not at scale. And if you're planning to build a portfolio of more than one property (which you should be), doing your own PM is the single fastest way to burn out and stop investing altogether.

Property management is not collecting rent. That's the easy part. Property management is:

• Screening tenants (properly — TICA checks, credit reports, employer verification, prior landlord references)
• Organising and attending inspections
• Handling maintenance requests at 10pm on a Sunday
• Issuing breach notices and Notices to Vacate when tenants fall behind on rent
• Managing VCAT proceedings when things go sideways
• Staying current on the Residential Tenancies Act (which is 868 pages in Victoria and gets updated regularly)
• Chasing contractors for quotes, scheduling repairs, following up on invoices [8]

Do you have time for that while also working a full-time job? Probably not. And if you try, one of two things happens: either you neglect the management (and your returns suffer), or you neglect your job (and your income suffers).

Our PM team manages at a 1:50 ratio — each dedicated leasing manager handles a maximum of 50 properties. The industry average is 1:170. That difference is why our vacancy rate is under 2%, our arrears rate is under 2%, and our tenant retention is consistently above 85% 8.

The 7% PM fee costs a lot less than the vacancy, arrears, and maintenance blowouts that come from amateur management.

The real framework: find the right people

Here's the uncomfortable truth. The investors who make money in property are not the ones who know the most about property. They're the ones who find the right people to work with.

The best deal finder. The cheapest flooring supplier. The most reliable tradie. The most responsible property manager. The buyer's agent who actually uses data, not spruiker scripts.

Your job as an investor is not to be an expert at everything. It's to build a team of experts and hold them accountable.

I came from IT. My background is in systems and data, not in swinging hammers. What I bring to property is the ability to evaluate information quickly, spot patterns in data, and negotiate with calculated aggression. The construction? That's our reno team. The tenant management? That's our PM team. The legal compliance? That's our Madura handling VCAT 8.

No single person can do all of this well. The investors who try end up doing all of it badly.

If you're thinking about buying in Melbourne, or you've already got a property and you're wondering why the returns don't match what you expected, come talk to us. Not for a sales pitch. For a genuine assessment of where your portfolio stands and what it could look like with the right team behind it.

I'm Joey Don. I only do real talk.