Granny Flat Boom Fuels Renovation Lending — How Non-Bank Lenders Are Financing Australia's Secondary Dwelling Wave

Granny Flat Boom Is Fuelling a Surge in Renovation Lending — And Non-Bank Lenders Are Driving It

Australia is in the middle of a granny flat construction wave. Renovation loans are surging as property owners convert backyards, garages, and underused spaces into secondary dwellings — and it's non-bank lenders, not the big banks, who are doing most of the financing, according to reporting by Australian Broker this week.

The trend is being driven by several converging pressures: a chronic housing shortage, rising rental yields, and a growing number of homeowners looking to generate income from their existing property. Granny flats and secondary dwellings now represent one of the most active segments in residential construction lending.

Why This Is a Non-Bank Story

Major banks have been slow to develop flexible renovation and secondary dwelling loan products. Their serviceability calculators are built around straightforward owner-occupied or investment scenarios — not the hybrid cases that granny flat construction creates.

A common scenario non-bank lenders regularly finance:

• A self-employed homeowner wants to build a granny flat on their current property
• The primary residence has significant equity
• The borrower's income is documented via BAS or accountant letter, not payslips
• Expected rental income from the new dwelling is factored into serviceability

For a major bank, this transaction is complicated enough to trigger a rejection. For an experienced non-bank lender, it's a standard deal.

The Numbers Behind the Trend

The Residential Construction Pipeline data shows:

• Secondary dwelling approvals have increased by over 30% in the past 18 months in Victoria and NSW
• Average construction cost for a compliant granny flat: $180,000–$280,000 (depending on state and size)
• Rental yields on secondary dwellings in inner and middle-ring suburbs: 4.5%–6.5% gross
• Payback periods for many borrowers: 12–18 years from rental income alone

With rental vacancy rates still historically low across major cities (CoreLogic, March 2026), the economics of granny flat construction continue to stack up — even in a high interest rate environment.

Financing Options for Property Owners

Several pathways exist for financing a granny flat build, depending on your existing equity and income profile:

1. Equity release / cash-out refinance

Use existing equity in your primary property to fund construction. Requires sufficient LVR headroom — most non-bank lenders allow cash-out up to 80% LVR for this purpose.

2. Construction loan

Drawn down progressively as construction milestones are reached. Interest paid only on drawn amounts during the build phase.

3. Renovation / home improvement loan

Structured as a variation on your existing mortgage — suitable for smaller builds where construction complexity is lower.

For self-employed borrowers, the critical advantage of non-bank lenders is that Alt Doc income evidence (BAS statements, accountant declarations) is accepted across all three structures.

MPFG's Take

Granny flat financing is an area where non-bank flexibility genuinely outperforms the major banks for most self-employed owners. The asset class has strong fundamentals, and lenders who understand how to assess it — including factoring in projected rental yield — can unlock finance that a bank will simply refuse.

If you're a property owner considering adding a secondary dwelling and your income is self-employed, speak to a specialist before assuming the answer is no.

General information only. Lending criteria apply. Speak to MPFG Capital for advice tailored to your situation.