Most property investors make the same mistake: they fall in love with one metric and ignore the others. High yield? In. Top CAGR? In. They pick a suburb, justify it, and move on.

Real data-driven investing reads metrics in the right order and treats no single number as gospel. Here’s the framework we use when building the TopBurb Score — and how you can apply it yourself.

The four-question framework

Any suburb you consider should answer four questions, in order:

  1. Is it safe? (risk and stability)
  2. Is it growing? (capital growth trajectory)
  3. Does it pay? (yield and cashflow)
  4. Will it keep doing what it’s doing? (forward indicators)

The order matters. A 7% yield in a high-crime suburb with falling population is a losing investment — even if the yield looks attractive. Safety first, then growth, then income, then trajectory.

Question 1: Is it safe?

The stability filter rules out problems before you invest money. Key metrics:

  • SEIFA decile — below 4 signals elevated risk of tenant issues, higher vacancy, and weaker long-term growth. Not an absolute veto, but a flag.
  • Crime rate trend — raw numbers matter less than direction. A decile-4 suburb with falling crime is far better than a decile-6 suburb with rising crime.
  • Vacancy rate — above 3% is a warning. The suburb is struggling to fill rentals.
  • BAL rating — hills suburbs in Perth need a BAL check. Insurance premiums and resale discounts are real.

If any two of these flag warnings, skip the suburb. No yield is worth it.

Question 2: Is it growing?

Capital growth is where long-term wealth comes from — for most Australian investors, growth beats yield over 10+ years. Key metrics:

  • 10-year CAGR — the honest long-run story. Above 6% beats Australian average. Below 4% is concerning.
  • 5-year CAGR vs 10-year CAGR — is recent growth accelerating (bullish) or decelerating (caution)?
  • 12-month growth — context for where you’re buying in the cycle.
  • Population trajectory — growing population = growing demand. Check ABS estimates and local council forecasts.

A suburb with 7% 10-year CAGR, 9% 5-year CAGR, and 12% recent growth is in a strong growth phase. A suburb with 6% 10-year but only 2% over the last 5 is cooling.

Question 3: Does it pay?

Yield matters because it funds holding costs and compounds your ability to scale:

  • Gross rental yield — the top-line. Perth averages 4.2%. Above 4.5% is strong, above 5% is exceptional.
  • Net yield (estimated) — strip out rates, insurance, management, maintenance. Usually 1.0-1.5 points below gross.
  • Weekly rent vs surrounding suburbs — is the suburb’s rent under-priced relative to comparable areas? That’s room to grow.

A critical check: is the yield sustainable? A 6% gross yield that depends on a single mining operation is not the same as a 6% yield backed by diversified employment.

Question 4: Will it keep doing what it’s doing?

Past performance doesn’t guarantee future returns — forward indicators do. These are the metrics most investors miss:

  • Demand-supply ratio — rising D/S above 1.3 signals upward price pressure.
  • Days on Market trend — tightening DOM (under 20 days) means buyer demand is exceeding supply.
  • Vendor discounting trend — compressing VD (under 3%) means sellers have pricing power.
  • New dwelling approvals — rising approvals mean future supply is coming. Falling approvals mean current tightness will persist.
  • Infrastructure pipeline — rail extensions, school construction, commercial development — all leading indicators of future demand.

The golden combination: tightening DOM, compressing VD, rising D/S, and declining approvals. That’s a suburb entering a growth cycle.

Common traps to avoid

Trap 1: The yield trap

“High yield must mean good investment.” No — often it means stagnant prices. A suburb with 7% yield but 2% CAGR is a cashflow drain in real terms once inflation is accounted for.

Trap 2: The story trap

“This suburb has a great story — new train line coming.” Stories are priced in by the time you’ve heard them. Verify with data: has DOM already tightened? Is the price already reflecting the story? Usually, yes.

Trap 3: The averaging trap

“Suburb median went up 12% last year.” Medians can be moved by mix changes, not genuine growth. Look at stratified data — median per property type, median per bedroom count.

Trap 4: The single-cycle trap

“10-year return of 9%” — are you looking at 2014-2024 (which had two boom cycles) or 2000-2010 (which had one)? Compare across multiple 10-year windows to avoid cycle-specific distortion.

Trap 5: The narrative alignment trap

“This suburb fits everything I believe.” If you find yourself building a case for a suburb, you’re no longer reading data — you’re confirming bias. Force yourself to argue the opposite side.

How TopBurb compresses this into one Score

The TopBurb Score combines 22 metrics into a single 0-100 number, weighted to reflect the four-question framework. Safety metrics account for ~20% of the Score. Growth metrics ~35%. Yield ~20%. Forward indicators ~25%.

This weighting isn’t arbitrary — it reflects what historically drives 10-year total returns in Australian residential property.

But the Score is a starting point, not a destination. The full report contains every underlying metric so you can apply your own weighting. Different investors have different priorities, and the data should serve your framework, not dictate it.

The one thing most investors get wrong

They skip question 4.

Past growth is reassuring. Present yield is tangible. But the future is where you actually make or lose money — and the future shows up in forward indicators like DOM, D/S, and approvals long before it shows up in price data.

The investors consistently finding opportunities early are watching these signals. The ones buying at the peak are reading last year’s CAGR and thinking it’s predictive.

Read the data in the right order. Read all of it, not just the parts you like. That’s the edge.