Imagine a Melbourne homeowner reaching practical completion on a new backyard granny flat in early August. Their spreadsheet assumes the property will collect rent from the following Monday, giving them almost a full year of income.
The building looks finished, but the required occupancy paperwork is still being finalised. Window coverings and bins are not ready, listing photos have not been taken, and no renter has inspected the property.
The project may be complete for one purpose, but it is not yet producing rent.
The practical answer
A new granny flat starts earning rent when it is lawfully ready for occupation, meets Victorian rental requirements, has been leased and reaches the paid start date in the rental agreement.
There is no universal number of days between construction completion and first rent. The gap depends on the building surveyor’s completion requirements, outstanding work, rental compliance, marketing, local demand, applicant checks and the agreed move-in date.
That gap belongs in the first-year investment model. It is different from the normal vacancy allowance used after the property has settled into ongoing rental operation.
Permission to rent is only the first check
Planning Victoria states that anyone can live in or rent a small second home, including an unrelated person. It also states that a small second home always requires a building permit and remains subject to residential tenancy requirements.
This answers who may occupy the dwelling. It does not mean every completed-looking building can immediately be advertised or occupied.
Property-specific planning controls may still affect the approval path. The Council Approval Guide explains the difference between general rules and the approvals that may apply to a particular address.
Practical completion is not the same as occupancy approval
A builder may describe the contracted work as practically complete while minor items or administrative steps remain. The building permit and building surveyor determine the mandatory inspections and completion requirements.
Victorian Government guidance says a new home cannot be occupied until the building surveyor has issued the required occupancy permit. The surveyor may require certificates or statements from people involved in the construction before issuing it.
Do not use the final builder invoice or appearance of the dwelling as the rent-start trigger. Confirm with the building surveyor which occupancy or completion document applies to the project and obtain it before planning a move-in date.
The How We Build page shows where approvals and handover sit within the wider project sequence.
Rental standards apply before advertising
Building approval and rental compliance are related but separate checks.
Consumer Affairs Victoria states that rental providers and agents must reasonably believe a property meets the rental minimum standards when it is advertised or offered to let. The standards must also be met before the renter moves in.
The current categories cover matters including:
- bathroom and kitchen facilities
- electrical safety
- fixed heating
- lighting and ventilation
- locks and window latches
- structural soundness
- toilets and laundry connections
- bins
- window coverings and cord anchors
This can expose small but important gaps at the end of a project. A dwelling may have passed building inspections but still need curtains or blinds, compliant cord anchors, bins or rental-specific checks before marketing.
Marketing does not create paid occupancy
Once the property is ready to advertise, a property manager may still need time to:
- confirm an evidence-based fixed asking rent
- arrange photography and prepare the listing
- schedule inspections
- receive and assess applications
- obtain the owner’s decision
- prepare the prescribed rental documents
- complete the condition report and move-in process
Consumer Affairs Victoria requires a rental property to be advertised at a fixed amount. Rental providers and agents cannot invite or accept offers above that advertised rent. From 31 March 2026, the prescribed rental application form must also be used.
The Rental Income Guide can help test tenant demand and rent assumptions before the listing goes live.
First-year ROI can differ from a normal year
The figures below are hypothetical example assumptions only. They are not a rent appraisal, building timeline, fee quote or return forecast.
| Item | First year after completion | Stabilised year |
|---|---|---|
| Weekly rent assumption | $540 | $540 |
| Paid rental weeks | 47 | 50 |
| Collected rent | $25,380 | $27,000 |
| Recurring cash operating costs | $4,000 | $4,000 |
| One-off readiness and leasing costs | $2,500 | $0 |
| Pre-finance operating cash | $18,880 | $23,000 |
| Complete project cost | $220,000 | $220,000 |
| Simple pre-finance return | 8.6% | 10.5% |
In this example, five unpaid weeks after completion and $2,500 of one-off readiness and leasing costs reduce first-year pre-finance operating cash by $4,120 compared with the stabilised year.
The difference is about 1.9 percentage points when both results are divided by the same example project cost.
The calculation excludes finance, tax and any construction-period holding costs. It simply shows why a 52-week rent estimate can overstate the first year.
Use the ROI Calculator to test paid weeks and first-year costs separately from a normal operating year.
One-off costs need their own budget line
The first lease may create costs that are not repeated every year in the same way. Depending on the project and management arrangement, these may include:
- final rental-compliance work
- blinds, basic fixed inclusions and bins
- cleaning, photography and advertising
- letting and condition-report fees
- utility account or metering setup
- landscaping and access completion
- insurance changes before leasing
Do not treat these as construction costs twice, but do not leave them outside the investment model either. Obtain actual quotes and check the management authority.
The complete denominator also matters. The Granny Flat Cost Victoria guide explains why site works, services, approvals and owner-selected items must be added before relying on a return percentage.
Prepare early without promising an impossible date
Some rental preparation can begin before handover.
You can seek a rental appraisal from the proposed plans, ask a property manager what inclusions local renters expect, choose window coverings, plan bins and access, obtain insurance advice and prepare the marketing brief.
Avoid committing to an unsupported availability date. Construction, inspections and documentation can change. The property should only be advertised when the current Victorian requirements for rental minimum standards are satisfied.
It is also sensible to keep a contingency for the first lease-up period. Strong suburb demand does not guarantee an immediate suitable application.
Build the income timeline from the land forward
The realistic sequence is:
- confirm that the property can support the proposed dwelling
- establish the approval and construction scope
- complete the build and required inspections
- obtain the applicable occupancy and completion documentation
- satisfy rental minimum standards
- advertise, inspect and select a renter
- begin collecting rent under the agreement
Site constraints can affect the schedule long before the final leasing stage. Access, easements, services, overlays and usable backyard area may change the design, cost or completion timing.
MPLUS can review those early property inputs before the income start date is treated as fixed. Check My Land to test whether the project behind the first-year ROI model is workable.
Sources checked
- Planning Victoria, Small second homes
- Victorian Government, Planning and building permits
- Consumer Affairs Victoria, Rental properties minimum standards
- Consumer Affairs Victoria, Applying for a property
