St Marys SA Property Investment

Marion · 5042 · Score: 67/100 · Buy

Median House Price
$975K
Rental Yield
3.1%
Vacancy Rate
0.8%
Median Weekly Rent
$675/wk
Median Unit Price
$637K
Population
3,010
Days on Market
20 days
Annual Growth
10.7%

St Marys Short-Term Rental (Airbnb) Market

Avg Nightly Rate
$457.19/night
Occupancy Rate
42%
Est. Annual Revenue
$70K
AI Investment Analysis

St Marys SA Investment Brief

BUY3.1% gross yield on a $975,000$1,097,342 (sources disagree, range shown — do NOT quote a single number) median.

THE MARKET

St Marys has compounded at 3.5%/yr over 5 years. Median sits in the $975,000$1,097,342 (sources disagree, range shown — do NOT quote a single number) band today. Properties are sitting on market for 20 days (sellers have the leverage).

  • Median house: $975,000$1,097,342 (sources disagree, range shown — do NOT quote a single number) | Units: $636,990
  • Gross yield: 3.1% | Net yield: 1.6%
  • 5yr price CAGR: 3.5%/yr | 3yr forecast: 13.5%/yr
  • Population: 3,010 | Owner-occupier rate: 61% | Affluence: High
  • Supply pipeline: Low — Price growth outpacing new supply, limited development pipeline

RENTAL SNAPSHOT

  • Vacancy: 0.8% (improving) | Rental demand: Very High
  • Median weekly rent: $675/wk | Days on market: 20 (improving)
  • Landlord market — rents likely to keep rising.

SHORT-TERM RENTAL

  • Median nightly rate: $457/night | Occupancy: 42%
  • Estimated annual STR gross: ~$70,087/yr
  • vs long-term rent: $35,100/yr (+100% STR premium — factor in higher management costs)

INFRASTRUCTURE & CATALYSTS

  • North South Corridor (South Australia) (Under Construction)
  • Adelaide Metro Train Services Franchise (Under Delivery)
  • Transport: Tonsley station 1.0km away

BULL CASE

If St Marys maintains 3%+ annual growth and vacancy stays below 0.8%, median prices could reach $1,282,825 within 3 years with yields compressing slightly as capital values rise.

BEAR CASE

A market correction or interest rate shock could see prices in St Marys pull back 10-15% from $1,115,500, with vacancy rising to 1.4% and rental yields softening as tenants gain leverage.

KEY RISKS

  • Bushfire risk: HIGH (planning_overlay) — confirm BAL rating and any bushfire overlay obligations for the property

COMPARABLE MARKETS

  • Elizabeth (SA): $817,500 median, 3.1% yield, 0.0% 1yr growth
  • Gepps Cross (SA): $912,646 median, 1.9% yield, 2.1% 1yr growth
  • Kilburn (SA): $1,093,556 median, 2.8% yield, 31.9% 1yr growth

THE PLAY

St Marys presents a compelling investment opportunity. The combination of solid fundamentals and very high rental demand supports entry at current price levels. Proceed with due diligence on specific properties. Target gross yields above 3.1% and prioritise properties with value-add potential. Consider timing entry around the current cooling phase of the market cycle.

  • Entry range: $1,003,950$1,227,050
  • Minimum gross yield to target: 4.5%
  • Watch signal: vacancy staying below 2% and days on market holding under 35

This analysis is for informational purposes only and does not constitute financial, legal, or investment advice. Seek professional advice before making investment decisions.

Gentrification Index

Pre-gentrification3.5/10
High SEIFA decile — already upgraded or established affluent area
Inner/middle ring location (8.9km to CBD) — high gentrification corridor
Active development pipeline (3617 approvals) — supply attracting new residents
Strong public transport infrastructure — supports walkable gentrification

Growth Forecast

high confidence
1yr Forecast
4.4%
p.a.
2yr Forecast
4.0%
p.a.
5yr Forecast
3.5%
p.a.

Basis: 5yr CAGR 3.5% + 10yr CAGR 5.0%

Growth drivers
  • +Above-average population growth (1.8%/yr)
  • +Very tight rental market (vacancy 0.8%) — upward price pressure
  • +Active market (20 days avg)
Headwinds
  • High supply pipeline (3617 new approvals) — may cap price growth

Suburb Metric Thresholds

8 green4 yellow4 red
Rental Vacancy Rate
0.8 high impact
Days on Market
20 high impact
Weekly Rent (house)
675 medium impact
5yr Price CAGR
3.55 high impact
10yr Price CAGR
5.02 high impact
1yr Price Growth
10.73 medium impact
Population Growth
1.77 high impact
Median Household Income
1476 medium impact
Unemployment Rate
6.4 medium impact
Public Transport Score
7.5 medium impact
School Zone Quality
7.2 medium impact
Distance to CBD
8.88 medium impact
SEIFA Advantage/Disadvantage
7 medium impact
Owner Occupier Rate
60.7 medium impact
Gross Rental Yield (%)
3.15 high impact
Net Rental Yield (%)
1.65 high impact

Macro Environment

Macro Indicators

Cash Rate

4.35%

0.25%

Cash rate as at 2026-05-06 · Credit data 2026-04

Suburb Supply & Demand

Suburb Supply Pipeline — New Dwelling Approvals

789

2020

799

2021

636

2022

626

2023

767

2025

New dwelling approvals — higher numbers mean more future supply

Socio-Economic Profile

Source: ABS Census 2021

SEIFA Index · Postcode 5042

Most disadvantagedLeast disadvantaged

Decile 6 of 10 — Average

Population

11,832

Education (IEO)

8/10

Econ. Resources (IER)

3/10

10-Year Investment Projection

Modelled on St Marys SA data — rent, capital growth, tax, and depreciation over 10 years.

Pre-filled: $675/wk median rent for St Marys. Capital growth and rent increase are editable assumptions.

Schools

In your catchment

Unley High School
SecondaryGovernment
7.6/10

These are the government-school zones containing this suburb centroid. Specific addresses within the suburb may fall in different catchments — confirm with the school directly.

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Data sourced from ABS, state government property sales, and Airbnb market analytics. For informational purposes only — not financial advice.