Mount Martha (VIC 3931) in Focus 2026: Is It a Good Investment? R-Score 86/100, 4.2% Yield & Best Streets

Market Classification: Established Family & Commuter Corridor · R-Score: 86/100 (National Rank #2,247 of 15,286) · Street Average: 62/100 across 380 streets.

Mount Martha (VIC 3931) represents a bread-and-butter Australian family housing market($1,225,000 median price, $995/wk rent, 4.2% gross yield) supported by +1.6% 3-year council population movement. Here, investment returns are determined almost entirely by micro-location: separating quiet, >65% owner-occupied pockets from main-road or high-public-housing blocks.

“I would treat the 1.8% vacancy rate as useful support, not a licence to overpay. With an 80% LVR purchase showing a $442 weekly pre-tax shortfall, buyers need to be selective about the street and property, and keep a proper buffer for the holding costs.”

Looking for the live, monthly-updated numbers? The Mount Martha (VIC) suburb profile tracks the current median house price, rent, vacancy and R-Score, and the Mount Martha street-by-street scores rank every street. This article is our investment analysis of what those numbers mean.

Below is our full September 2026 quantitative and street-level breakdown for Mount Martha (VIC 3931), combining 36 months of settled price and rental history from our Aurora research warehouse, council-level supply and employment data for Mornington Peninsula (VIC), and block-by-block ABS 2021 Census SA1 tenure and yield rankings across 11,139 residential addresses.

1. Mount Martha (VIC) 3-Year Market Trajectory & 27-Indicator R-Score (September 2026)

Over the past 12 months, Mount Martha’s median house price moved -17.8% (from $1,490,000 to $1,225,000), bringing its 3-year cumulative price movement to -30% (from $1,751,000 three years ago). On the rental side, median weekly asking rents moved +0% over the past year to $995/wk (+10.3% over 36 months), equating to a 4.2% gross rental yield. Compared with 12 months ago—when Mount Martha carried an R-Score of 86/100—its current composite R-Score of 86/100 represents a +0-point shift in underlying market pressure.

Indicator / R-Score Pillar	Mount Martha (VIC) Current	12-Month / 36-Month Context
Composite Suburb R-Score	86 / 100	Ranked #2,247 of 15,286 suburbs (was 86/100 12m ago)
Median House Price	$1,225,000	12m change: -17.8% · 36m change: -30%
Median Weekly Rent & Gross Yield	$995/wk (4.2%)	12m rent change: +0% · 36m rent change: +10.3%
Rental Vacancy & Days on Market	1.8% vacancy	Median selling time: 69 days on market (1.5% vacancy is the tight-market line)
Pillar 1: Buyer Demand	47 / 100	Measures days-on-market compression, vendor discounting & sales velocity
Pillar 2: Supply & Ownership	49 / 100	Measures stock on market, building approvals vs stock & owner-occupier share
Pillar 3: Price Momentum	72 / 100	Measures short/medium-term price velocity vs Mornington Peninsula & VIC
Pillar 4: Yield Pressure	63 / 100	Measures gross rental yield, rent trajectory & vacancy compression

2. The “Two-Speed Suburb” Test: Best & Worst Streets in Mount Martha (VIC)

Why do two 4-bedroom houses in Mount Martha achieve completely different bank valuations and tenant quality? Because suburb medians blend every pocket together. When we map all 11,139 addresses across 380 streets in Mount Martha through G-NAF to their ABS 2021 Census SA1 blocks, the suburb splits into three distinct tiers:

• Strong Street Profile (Score 75–100): 113 streets (37% of scored streets) pass both ABS Census tenure tests (owner-occupiers >65% and public housing ≤5%) plus at least one—or both—of the Mount Martha rent and yield benchmarks.
• Mid / Mixed Street Profile (Score 50–74): 181 streets pass the core owner-occupier and public-housing thresholds but sit below the suburb median on weekly rent or yield.
• Weaker / Caution Street Profile (Score 0–25): 9 streets fail one or both census tenure thresholds—meaning either owner-occupation sits at or below 65% or state/community public housing exceeds 5% on those specific SA1 blocks.

Top 5 Highest-Scoring Streets in Mount Martha (VIC)

These streets sit in SA1 census blocks with high homeowner pride of ownership, minimal social housing concentration, and strong block-level rents (inspect all 380 streets in Mount Martha):

Top Street in Mount Martha	Street Score	Addresses	Owner-Occupiers	Public Housing	SA1 Rent & Yield
#1 St Ives Grove	100/100	51	84%	0%	$1100/wk (5%)
#2 Greenfield Way	100/100	12	84%	0%	$1100/wk (5%)
#3 Finlayson Avenue	100/100	71	83%	0%	$1010/wk (4.9%)
#4 Mcgregor Avenue	100/100	40	83%	0%	$1010/wk (4.9%)
#5 Headland Waters	100/100	36	83%	0%	$1010/wk (4.9%)

Streets Where Block-Level Tenure Trails the Mount Martha Average

By contrast, the streets below run through SA1 census blocks that fail one or more of our tenure or rental tests. A lower Street Score is not a judgement of any individual house, but it highlights where higher renter turnover or public housing concentration exists within Mount Martha:

Caution Street Sample	Street Score	Addresses	Owner-Occupiers	Public Housing	SA1 Median Rent
Frances Drive	25/100	37	63%	0%	$600/wk
Cassandra Drive	25/100	17	63%	0%	$600/wk
Tanyalee Court	25/100	13	63%	0%	$600/wk

3. Economic & Supply Drivers in Mornington Peninsula Council (Victoria)

Mount Martha sits within the Mornington Peninsula Local Government Area, which has a residential population of approximately 172,217 (+1.6% population movement over the past 3 years) and 89,110 total dwellings. Three council-level fundamentals shape Mount Martha’s medium-term outlook:

• Local Employment Diversity (ABS Census): The largest employment sectors across Mornington Peninsula are Health Care and Social Assistance (14%), Retail Trade (14%), Construction (11%), Accommodation and Food Services (10%). Multi-sector employment reduces reliance on any single employer or commodity cycle.
• New Building Approvals vs. Existing Stock: Over the latest 12-month financial year, Mornington Peninsula approved 0.9% new dwelling stock (~782.636 dwellings). Because annual additions sit under 1.8% of stock, incoming supply is constrained relative to tenant and buyer demand.
• Tracked Infrastructure Pipeline: Mornington Peninsula currently has $334 million in tracked major infrastructure projects (placing it in the 16th percentile of Australian councils).

4. Worked Cashflow, Deposit & 80% LVR Stress-Test for Mount Martha (September 2026)

What does it actually cost to acquire and hold a typical house in Mount Martha at today’s median price of $1,225,000 and median rent of $995/wk? Below is the baseline 80% Loan-to-Value Ratio (LVR) model we use to stress-test serviceability before shortlisting a property:

Cashflow & Capital Item	Mount Martha Worked Figure	Assumptions & Notes
Purchase Price (Suburb Median)	$1,225,000	Settled house median as of September 2026
20% Deposit + Est. Stamp Duty & Costs	$303,800	$245,000 deposit (80% LVR) + ~$58,800 stamp duty, legal & inspection allowance (can be funded via usable home equity)
80% LVR Loan Amount	$980,000	Standard no-LMI investor loan threshold
Gross Annual Rental Income	$51,740/yr ($995/wk)	4.2% gross rental yield before vacancies and expenses
Est. Annual Interest + Operating Costs	$74,725/yr	Assumes 6.25% interest-only ($61,250/yr) + ~1.1% for council rates, insurance & property management ($13,475/yr)
Pre-Tax Weekly Cashflow Position	-$442/wk top-up	Before tax deductions / depreciation (confirm post-tax position with your accountant)

5. Who Should Buy in Mount Martha—And 3 Rules Before You Make an Offer

Solid 86/100 R-Score Backed by Mornington Peninsula Fundamentals. Based on our September 2026 data, Mount Martha is best suited to higher-income professionals, medical practitioners, and upgraders with strong cashflow buffers targeting scarce land in an owner-occupier dominated suburb.

1. Never Buy Blind on the Suburb Median: In Mount Martha, 9 streets score below 50/100 on our census tenure and yield tests. Always run the exact street through the Mount Martha Street Score Hub and target the 113 streets scoring 75–100/100.
2. Check Lot-Level Overlays (Flood, Bushfire, Slope & Easements): Even on a 100/100 streetlike St Ives Grove, individual lots can carry overland flow paths, steep gradients, or sewer easements that restrict granny-flat additions or spike insurance premiums.
3. Price Against Street-Matched Settled Comparables: Do not let a selling agent justify an asking price on a 25/100 street using comparable sales from a 100/100 street. Compare settled sales within the same SA1 Street Score band.