PropPulse Investment Score Explained: How We Rank 2,642 AU Postcodes

Property research generates a lot of numbers and not many decisions. The PropPulse Investment Score is a 0-100 composite designed to compress the five things that actually matter for residential investment in Australia into one number you can sort by, filter on, and use to short-list postcodes in seconds.

This isn't a magical predictive index. It's a transparent weighted average of five public-data signals. The math is open, the inputs are official ABS + ATO data, and the limits are honest. Here's exactly what goes in and how the score behaves.

The five components

The score is calculated as the weighted sum of five sub-scores:

Total possible: 100. A postcode missing data for any sub-score is graded on the components it has (i.e. if SEIFA isn't available, it's scored out of 75).

Yield (0-30 points)

Calculated as (median weekly rent × 52) ÷ state mean dwelling price × 100. This is gross rental yield expressed as a percentage. The mapping to points is a piecewise linear function:

• Yield < 2%: 0 points
• 2% - 3%: linear from 0 to 10 points
• 3% - 5%: linear from 10 to 25 points
• 5% - 7%: linear from 25 to 30 points
• 7%+: 30 points (capped)

Why this curve: it rewards moving from yield-soft (3% Sydney metro) to cashflow-positive (5%+ regional QLD) heavily, but stops giving credit for very high yields above 7% because those are typically distressed or single-employer towns where the headline number is misleading.

Wealth (0-25 points)

Direct mapping from ABS SEIFA IRSAD decile (1-10). Score = decile × 2.5. So decile 10 = 25 points; decile 5 = 12.5 points; decile 1 = 2.5 points.

Why this matters: SEIFA decile correlates strongly with long-term capital growth. Top-decile suburbs have averaged ~1pp higher annual price growth than median over the last 20 years. They also tend to have lower vacancy and longer-tenure renters, which improves the practical net yield.

Demand (0-20 points)

Calculated as % rented dwellings ÷ 80 × 20. Capped at 80% rented for the maximum (no postcode is 100% renter, and postcodes with extreme renter density are usually transient apartment markets which have their own risks).

High renter % indicates an active rental market with deep tenant pool and lower likely vacancy.

Diversity (0-15 points)

Shannon entropy of dwelling type mix (separate house / townhouse / apartment), normalised to log(3) and scaled to 15 points. A postcode that's 100% one dwelling type scores 0; a perfectly even 1/3 1/3 1/3 split scores 15.

Why this matters: dwelling diversity reduces concentration risk. A postcode that's 95% apartments suffers when the apartment market crashes (oversupply, new-build glut). A diversified postcode has more stable tenant demand across cycles.

Affordability (0-10 points)

Banded scoring on median weekly rent as a price proxy:

• < $400/wk: 10 points (cheapest, most accessible to first-time investors)
• $400-600/wk: 7 points
• $600-800/wk: 5 points
• $800-1000/wk: 3 points
• $1000+/wk: 1 point

This rewards postcodes that are accessible to typical Australian investor budgets (sub-$700K property values). High-yield, low-affordability combinations (luxury Sydney apartments) score low here even if their absolute returns look fine — because most readers can't actually buy them.

Rating bands

The numeric score maps to a qualitative rating:

• 80-100: Exceptional — top-tier across multiple components
• 70-79: Strong — investor-grade, multiple things working
• 55-69: Good — solid fundamentals, balanced
• 40-54: Fair — niche play, requires specific thesis
• 0-39: Poor — multiple structural issues

Data sources

• Yield: median rent from ABS Census 2021 G40 + state mean price from ABS RES_DWELL (refreshed quarterly)
• Wealth: ABS SEIFA 2021 IRSAD via Digital Atlas of Australia
• Demand: ABS Census 2021 G37 (tenure breakdown)
• Diversity: ABS Census 2021 G36 (dwelling structure)
• Affordability: ABS Census 2021 G40 (median weekly rent)

All sources are licensed CC-BY 4.0 (ABS) or CC-BY 3.0 AU (ATO). Methodology is published, data lineage is traceable, and we don't have any proprietary "secret sauce" — the score is reproducible by anyone with access to the same source tables.

What the Score doesn't capture

Honest limitations of any composite metric:

• Capital growth forecast. The Score reflects current fundamentals, not future trajectory. We compute a separate 5-year capital gain projection using state CAGR + SEIFA modifier — that's a complementary signal, not baked into the Score.
• Recent transaction velocity. Census data is 2021-anchored. Postcodes that have shifted dramatically since (e.g. post-COVID lifestyle migration to Tweed Heads) may score higher or lower than current reality.
• Specific property risk. A great postcode can contain terrible individual properties (flood-prone, heritage-encumbered, body corporate from hell). Score is suburb-level only.
• Mining-town concentration. Yield component caps at 30 for 7%+ but doesn't penalise single-employer concentration. Use total_dwellings alongside Score to filter these out.
• Government incentive arbitrage. Score doesn't factor in FHB grants, stamp duty concessions, or NRAS — those are postcode- and buyer-specific and shown separately in the full report.

Example comparisons

How the Score behaves across very different postcodes:

Surry Hills (2010 NSW)

SEIFA 10/10 (top decile, 25 wealth points), but yield around 2.1% (low single-digit yield points), 78% rented (16 demand points), apartment-heavy diversity (~9 diversity points), $599/wk rent (medium affordability ~5). Total around 57/100 — "Good" rating. The wealth and demand carry it; the weak yield holds it back.

Townsville (4810 QLD)

SEIFA ~6 (15 wealth points), yield ~6% (~28 yield points — almost capped), ~50% rented (12.5 demand points), good diversity (12 points), $312/wk rent (top affordability — 10 points). Total around 78/100 — "Strong". Yield does the heavy lifting.

Mt Isa (4825 QLD)

SEIFA ~3 (7.5 wealth), yield ~7%+ (capped 30 yield points), high renter % (good demand), low diversity (mostly houses, ~5), best affordability (10 points). Total around 65/100 — "Good". The yield maxes out but the wealth + diversity components signal the underlying risk.

Bondi (2026 NSW)

SEIFA 10 (25), yield ~2.1% (~5), high renter %, apartment-heavy, $699/wk rent (low affordability — 5). Total around 58/100. Same flaws as Surry Hills: beautiful but yield-soft.

See it in action

The Score appears at the top of every full postcode report and in the Postcode Explorer (Investor tier). Or get the breakdown for any single postcode (yield score, wealth score, demand score, diversity score, affordability score) by hitting the /v1/intelligence/investment-score/{postcode} endpoint on our API.

Free signup unlocks one full report including Score breakdown for any AU postcode. Try it.