A $100K Renovation Turned $400/Week Rent Into $1,200. Here Are the Blueprints.

There's a persistent myth in Australian property that you have to choose between capital growth and cash flow. That high-growth suburbs deliver lousy rental returns, and high-yield properties sit in stagnant markets.

The data from our portfolio says otherwise.

This case study involves an $785,000 house on 700 square metres in Melbourne's southeast. Before conversion, it was renting for $400 per week — a gross yield of 2.6%. After a strategic $100,000 renovation that created three independent dwelling units from a single house, the property now returns $1,200 per week. That's a 7.6% gross yield on total outlay, and the property appreciated 10% in its first year of ownership 1.

Capital growth and cash flow. Not mutually exclusive. Just requires a different approach to renovation.

How we found this deal (and why nobody else wanted it)

The property had been under contract once before. The previous buyer's finance fell through, which spooked the market. Other buyers assumed something was structurally wrong — why else would a deal collapse? The vendor's expectations dropped. The listing agent, who we'd worked with on four prior transactions, flagged it to us before relisting 2.

The guide price was $770,000-$810,000. We secured it at $785,000 with a 60-day settlement and minimal conditions. The s32 was clean — no heritage overlay, no restrictive covenant, no sewer line cutting through the middle of the block. The easement sat neatly along the rear boundary, exactly where you want it for future development access 3.

What made this particular house ideal for conversion was the 700-square-metre block with 3.2-metre side access, flat topography, and a layout that naturally divided into separate living zones. We brought our builder and a Building Surveyor to the pre-purchase inspection specifically to validate that the conversion was physically and legally feasible before we committed.

That pre-commitment validation is something most buyers skip entirely. They buy first, then discover the renovation they imagined is either illegal, prohibitively expensive, or both.

The conversion plan: from 1 dwelling to 3 units

The original house was a standard 1980s brick veneer: three bedrooms, one bathroom, single living area, single garage. Nothing special. What mattered was the bones.

Unit 1 and Unit 2 (front dwelling, split into two): A certified fire-rated wall was installed to divide the existing house into two completely independent units. One side retained the original three bedrooms and bathroom. The other side received a new kitchen (IKEA-grade cabinetry, laminate benchtops, $2,200 for the fit-out) and a new bathroom ($10,000 including full waterproofing and tiling to 1.8m height) 4. Each unit has its own entrance. Combined rent: $800 per week.

The firewall is the single most important element. It cannot be plasterboard. It must be fire-rated and certified by a registered Building Surveyor. If there's a fire and your dividing wall is just gyprock, you carry unlimited personal liability 5.

Unit 3 (rear structure): A pre-existing detached structure in the backyard — roughly 25 square metres — was converted into a self-contained studio with kitchenette and bathroom. Connection to the existing sewer required only 8 metres of new pipe (within our standard builder's allowance of 10 metres). Rent: $400 per week.

Total renovation cost: approximately $100,000. Breakdown: ~$55,000-$60,000 for the front dwelling split (firewall, kitchen, bathroom, separate entries, electrical rewiring), ~$25,000 for the rear studio fit-out, ~$15,000 for compliance paperwork, Building Permits, surveyor fees, and safety certifications.

"The conversion cost pays for itself in under two years through the rental uplift alone," notes Yan Zhu, Co-Founder & Chief Data Officer at PremiumRea. "From $400/week to $1,200/week is an $800/week increase — that's $41,600 annually against a $100,000 outlay. And the property's bank valuation lifted from $785,000 to approximately $850,000 within twelve months."

Why the yield calculation matters more than people think

At $1,200 per week on a total investment of $885,000 ($785K purchase + $100K reno), the gross yield is 7.06%. With interest-only repayments on an 80% LVR loan ($628,000 at ~6.5%), annual interest is $40,820 6.

Annual rental income: $62,400. Holding costs (land tax, council rates, water, insurance, maintenance): ~$7,650 7. Net operating income: $54,750. Less interest: $40,820. Annual surplus: $13,930.

That is positive cash flow. In Melbourne. At current interest rates. On an asset that appreciated 10% in year one.

The comparison property — same street, same era, single-tenancy rental with no conversion — collects $400 per week. Same approximate purchase price. The $100K renovation is the entire difference between a 2.6% yield that bleeds cash and a 7.06% yield that generates it.

The broader statistical point is this: Melbourne's median gross rental yield for houses was approximately 3.0% in early 2023 8. Our converted properties consistently deliver 5.5%-7.5%. That gap is not luck. It's systematic renovation strategy applied to properties with the right physical characteristics.

The compliance framework you cannot afford to ignore

Victoria permits a maximum of three separate leases on a single residential title (Class 1a building) without triggering Rooming House registration requirements. Exceed that and you're into Class 1b territory — council registration, DDA accessibility modifications, fire exits with illuminated signage, and regular inspections 5.

This property operates with exactly three leases. That's by design, not coincidence.

Every tenancy has a current Occupancy Certificate. The Building Surveyor certified the firewall, the electrical compliance, the plumbing, and the fire safety provisions. We completed the full suite of safety checks required under Victorian rental law: electrical every two years, gas every two years, smoke alarms annually. Total compliance cost per inspection cycle: approximately $500-$650 9.

One detail that saves significant money: we installed internal sub-meters for electricity ($2,000 total) rather than applying for separate official meters from the distribution company ($20,000-$30,000). The property operates on a bills-included rental model where estimated utility costs are built into the weekly rent. This is standard practice for multi-tenancy conversions and is fully legal under Victorian rental regulations 10.

The $15,000 allocated to paperwork and compliance sounds like dead money. It is, in a sense — it doesn't make the property prettier or the kitchens fancier. But it's the difference between a legal, insured, defensible rental arrangement and an unlicensed conversion that could see you facing unlimited personal liability in a fire, or a council enforcement action that requires $30,000 in retrospective compliance work 5.

Can this be replicated? What to look for.

Not every property qualifies. In our experience, approximately one in fifteen houses we inspect has the right combination of characteristics for this type of conversion. The criteria are specific:

• Block size: 600 square metres minimum, 700+ preferred
• Side access: wider than 3 metres (needed for crane truck access during construction and for separate tenant entry)
• Topography: flat or near-flat. Every metre of slope adds roughly $50,000 to construction costs [3]
• Sewer line: at or near the rear boundary, not crossing through the centre of the block
• No restrictive covenant (Single Dwelling Covenant kills all multi-dwelling potential)
• House layout that naturally divides — ideally with existing hallway or living area that can become the separation point
• Zoning: GRZ (General Residential Zone) preferred over NRZ for greater development flexibility

The 10% capital growth this property achieved in year one is not guaranteed. But it reflects a broader pattern we've observed: established suburbs in Melbourne's southeast with constrained land supply — Cranbourne, Hampton Park, Narre Warren, Boronia — continue to appreciate because no new comparable supply can be built. You can build more townhouses in growth corridors. You cannot manufacture more 700-square-metre blocks in established suburbs.

"When clients tell me capital growth and cash flow are mutually exclusive, I show them this spreadsheet," says Yan Zhu. "The trick isn't choosing one or the other. It's buying the right land in the right location and then physically transforming the rental potential of the building sitting on it."