Drive through Ocean Grove, Leopold, Grovedale or Torquay and you will notice the backyards are working harder than they used to. A studio for a parent moving closer to family. A self-contained unit for an adult child saving a deposit. A compact second dwelling earning rent in a tight rental market. The granny flat (or, in Victorian planning language, the small second home) has quietly become one of the most talked-about property moves of 2026, and for Geelong and Bellarine homeowners sitting on generous blocks, it is a conversation worth having.
But while the building side of granny flats gets plenty of airtime, the financing side is often an afterthought, and it should not be. How you fund a second dwelling affects your interest costs, your tax position, your borrowing power and even whether the project stacks up at all. This guide walks through the rules, the realistic costs, and the lending options available to homeowners across Geelong, the Bellarine Peninsula, the Surf Coast, Melbourne and the rest of Victoria.
Two forces are driving the surge. The first is affordability: with house prices and rents both elevated, families are looking for ways to house parents, adult children or tenants without buying a second property outright. The second is regulatory: governments have been actively clearing planning obstacles to backyard dwellings as part of the broader housing supply push, and Victoria moved earlier than most.
The lending data reflects it. NAB reported in March 2026 that renovation loans jumped 21% in 2025 (outpacing the previous two years) with granny flats a stand-out theme in what customers are borrowing to build. The same report noted the Housing Industry Association expects granny flat builds to increase roughly tenfold by 2026 compared with four years earlier. This is no longer a niche project type; lenders see applications for backyard dwellings every week, and the good news is that mainstream finance handles them well when the loan is structured properly.
is how much renovation lending grew last year according to NAB’s March 2026 report: with granny flats one of the fastest-growing reasons Australians are borrowing against their homes to build.
Since December 2023, Victoria’s planning provisions have allowed a small second home on the same lot as an existing house without a planning permit in most cases. The dwelling must be 60 square metres or less and self-contained with its own kitchen, bathroom and toilet. There are sensible strings attached: a building permit is always required, the second home cannot be connected to reticulated natural gas, it cannot be subdivided or sold separately from the main house, and lots smaller than 300 square metres, or lots affected by flooding, environmental or other special planning controls, still need a planning permit. No extra car parking space is required.
Crucially for the finance conversation, Victoria places no restriction on who can live in a small second home. Unlike some interstate rules of years past, it can be rented to a family member, a dependent or a completely unrelated tenant: which is what turns a backyard build into a potential income-producing asset. Rules and overlays differ block by block, so confirm your property’s position with your council or a building surveyor, and check the current provisions at Planning Victoria before committing. If your plans run bigger than 60 square metres (a full second dwelling, dual occupancy or subdivision), you are into different planning and lending territory, closer to what we cover in our development finance guide.
Honest answer: it varies more than most headlines suggest. Mainstream reports commonly cite starting costs of roughly $100,000 to $120,000 for simpler or prefabricated builds, while custom architect-designed projects in Victoria are frequently quoted at $200,000 or more once site works are counted. The spread is wide because the biggest costs are often invisible in the brochure: site preparation, sloping blocks, soil conditions, and connecting sewer, water and power can add tens of thousands before a wall goes up.
For finance purposes, the number that matters is not an industry average but your fixed-price building contract plus a realistic contingency. Lenders will generally want to see the contract, and your borrowing capacity needs to cover the full project, not just the display-village price. Treat any figure you read online, including the ranges above, as a starting point for conversations with builders, and get multiple detailed quotes for your specific block before you approach a lender.
Most granny flat projects are funded one of three ways. The right route depends on how much equity you hold, the size of the build, and whether you want the discipline of progress payments.
| Option | How It Works | Often Best Suited To |
|---|---|---|
| Home equity top-up | Increase your existing home loan against the equity you have built, drawing the funds as a lump sum or via redraw/offset as the build progresses. | Owners with strong equity who want simplicity and a single loan. |
| Construction loan | The lender releases funds in stages as the builder completes each phase, usually with interest charged only on what has been drawn down. | Larger fixed-price contracts where staged payments and lender oversight suit the project. |
| Refinance with renovation funds | Switch lenders and borrow additional funds for the build at the same time: useful if your current loan is no longer competitive anyway. | Owners whose existing rate or structure is due for review regardless. |
| Other routes | Smaller amounts are sometimes funded with savings or a personal loan; SMSF and trust-owned properties involve strict borrowing rules and need specialist advice. | Modest studio-style builds, or complex ownership structures. |
If you are weighing an equity release, start with our home equity guide to understand how usable equity is calculated. For staged builds, our construction loans guide explains progress payments in detail, and our home renovation loans guide covers the middle ground. And if a lender switch is on the cards anyway, see our guide to refinancing your home loan in 2026.
Lenders assess a granny flat project on two fronts: can you service the extra borrowing, and what will the completed dwelling do to the property’s value? On serviceability, some lenders will factor in expected rental income from the second dwelling (typically shaded rather than counted dollar-for-dollar), while others are more conservative, and treatment can differ again if the tenant is a family member. On valuation, a well-built second home on a suitable block can add meaningful value, but the uplift is not guaranteed to match the build cost, and valuers take into account how the local market prices dual-living arrangements. Our guides on borrowing power and property valuations explain both sides of that equation.
There are also tax questions worth settling before you build, not after. Renting out a second dwelling brings rental income into your tax return, may allow deductions, and can have capital gains tax implications for your main residence: outcomes that depend heavily on your circumstances, so speak with your accountant early. If the plan is a short-stay listing rather than a long-term tenant, lender policy differs again; our guide to Airbnb and short-term rental finance covers what that changes.
A couple in Leopold came to us wanting to build a self-contained unit in their backyard for one of their mothers, who was finding Melbourne living costs and distance from the grandkids equally unappealing. Their block comfortably supported a small second home under Victoria’s rules, and their builder priced a fixed contract with proper allowances for site works and services. Rather than defaulting to a separate loan, we modelled two structures: a top-up against their existing equity, and a construction loan with progress payments. Because their fixed-price contract was staged and they wanted interest charged only as funds were drawn, the construction route suited them better, and because the dwelling could later become a rental if circumstances changed, we made sure the structure would not box them in. Mum moved from the suburbs to the Bellarine, and the family kept full flexibility for the future.
Our region is unusually well suited to the small second home. Established suburbs like Belmont, Highton, Newcomb and Hamlyn Heights carry a deep stock of older homes on 600-plus square metre blocks. Across the Bellarine (Ocean Grove, Barwon Heads, Point Lonsdale, Portarlington), dual living lets families keep ageing parents close to the coast without a second purchase, and gives holiday-home owners a way to add year-round rental income. In Torquay, Jan Juc and along the Surf Coast, a backyard studio can house a family member or help offset the mortgage in one of Victoria’s more expensive coastal markets. And in growth areas like Lara, Armstrong Creek and Werribee, some newer estates carry design covenants or smaller lots, so checking your title and lot size is step one.
While our roots are in Geelong and the Bellarine, we arrange granny flat and renovation lending for clients across Melbourne, Ballarat and Australia-wide. The playbook travels well: confirm the planning position, price the build properly, then structure the loan to suit both today’s purpose and tomorrow’s possibilities.
Get your finance structure sorted before you sign the building contract, not after. The choice between a top-up and a construction loan affects how your builder’s payment schedule needs to be written, and some lenders have specific requirements for fixed-price contracts and progress payment stages. Signing first and financing second is the most common way granny flat projects end up delayed, or funded through an expensive stopgap.
In most cases, no. Since December 2023, a small second home of 60 square metres or less on the same lot as an existing house does not require a planning permit: provided the lot is at least 300 square metres and not affected by flooding, environmental or other special planning controls. A building permit is always required, and conditions apply, so confirm your block’s position with your council or a building surveyor and check the current rules with Planning Victoria.
Published estimates commonly start around $100,000 to $120,000 for simpler or prefabricated builds, with custom projects often quoted above $200,000 once site works and service connections are included. Costs vary widely with your block’s slope, soil and services, so treat any published range as a guide only and work from fixed-price quotes for your specific site.
Often, yes. If you have built sufficient equity in your home, a loan top-up or refinance can release funds for the build, or a construction loan can release money in stages as the builder completes each phase. Which structure works best depends on your equity, the contract type and your broader plans: a broker can model the options across multiple lenders before you commit.
Victoria’s small second home rules let anyone live in or rent the dwelling, including unrelated tenants. Some lenders will count a portion of expected rental income toward your serviceability, while others apply it conservatively or not at all: policies genuinely differ, so the lender you choose can change what you can borrow. Renting also brings tax considerations, including possible capital gains tax implications for your main residence, so get advice from your accountant first.
We’ll assess your equity, compare top-up and construction loan structures across our lender panel, and set your project up to suit both today’s plans and tomorrow’s options.
With years of experience in mortgage broking and finance, Melanie helps first home buyers, homeowners and investors across Geelong, the Bellarine, the Surf Coast, Melbourne and regional Victoria navigate lending policy and structure the right loan. Contact our team on 03 9020 2699.
