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Links Property Finance · Construction loan mortgage broker, Sydney: Property Development Finance

Development finance funds the land and construction of a project built to sell or keep, and lenders size it on the project’s costs and end value rather than on your income alone.

Reviewed by Charles Touma Updated 18 October 2026

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Charles Touma, mortgage broker at Links Property Finance

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How do lenders size a development loan for a duplex or a small project?

Lenders size a development loan on loan to cost: the share of the total project cost, including land, construction, fees and interest, that they will fund, tested against the value of the finished dwellings.

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They also want approvals in place, your contribution and, on larger projects, presales and some experience.

Part of the construction loans guide.

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What would the repayments be?

Quick repayment estimate

Quick repayment estimate

$600,000
6.00%
30
Estimated repayment$3,597/mo≈ $1,660 per fortnight · total interest $695,029

If things change

Rate rises 1%$3,992/mo+$395 a month
25‑year term$3,866/mo+$269 a month, saves $135,287 interest
Lender’s test rate (+3%)$4,828/mowhat your budget is assessed at

Principal and interest, constant rate, monthly repayments. An estimate only, not credit advice or an offer.

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How lenders size a development loan

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  • Loan to cost.The share of the total project cost, including land, construction, fees and interest, that the lender will fund.
  • Loan to gross realisation.The loan as a share of what the finished dwellings are expected to sell for, assessed by a valuer before work starts.
  • Your contribution.Equity in the land, cash or equity in other property makes up the difference, and the lender usually wants it in first.

What do lenders check before they commit?

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  • Approvals.A development application or complying development certificate, with conditions you can meet.
  • A fixed-price building contract.With a licensed builder and insurance in place, and a quantity surveyor’s report on larger jobs.
  • Feasibility.Costs, end values and a margin that leaves room for overruns and slower sales.
  • Presales on larger projects.Some lenders want a share of the dwellings sold off the plan before they fund construction.

Residential construction or development lending?

Many lenders will fund a duplex or a small number of dwellings under their residential construction policy, especially if you will live in one or keep them, with progress payments as the build reaches each stage. Where that line sits differs from lender to lender.

Above a certain number of dwellings, or where everything will be sold, the loan usually becomes commercial development finance, with lower lending ratios, higher pricing and requirements such as presales and an independent monitor. See duplex and dual occupancy finance.

Interest during the build

Development loans are drawn progressively, and interest is charged only on what has been drawn. Delays cost money, because every extra month of building or marketing adds interest.

On larger projects the interest is often capitalised, which means it is added to the loan and repaid from the sales, so the lender includes an interest allowance in the project budget.

After the project is finished

The development loan is repaid from sales, or refinanced to investment or home loans for any dwellings you keep. If sales are slower than planned, some lenders offer residual stock loans that give more time to sell completed dwellings.

Plan for both outcomes before construction starts.

Common questions about development finance

How much do I need to contribute to a development?

More than for a home loan: lenders fund only part of the total project cost, and your land, cash or other equity covers the rest. The share depends on the lender, the size of the project and your experience.

Can I get development finance with no experience?

For a duplex or a small project, often yes, particularly with a reputable builder on a fixed-price contract. For larger projects, lenders usually want a track record, or an experienced project manager on your team, and may lend less without one.

Do I need presales?

Not always. Small projects funded under residential policy generally do not. Larger commercial development loans often require a share of the dwellings to be presold, though some non-bank and private lenders fund projects with fewer or no presales at a higher cost.

Can I build a duplex and keep both sides?

Yes. Many owners build, then refinance both dwellings once they are complete, on separate titles where subdivision is approved. The lender checks that your income and the rent support the ongoing debt.

What is a quantity surveyor’s report?

An independent report on the construction costs and, during the build, on progress, so the lender only pays for work that has been done. Lenders commonly require one on larger projects, and its cost belongs in the project budget.

Building one home rather than several? Our guide to construction loans covers progress payments for a single build.

Get advice on property development finance

Charles can look at your site, plans and costings and say whether the project fits residential construction lending or needs development finance, before you commit to a builder.

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Charles Touma, mortgage broker at Links Property FinanceCharles calls back within one business day. No documents needed yet.

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Charles Touma, mortgage broker at Links Property Finance
Reviewed by Charles Touma Director & Mortgage Broker · MFAA member · Credit Representative 579003 under ACL 389328 About Charles · Construction loans · MFAA register · ASIC register · Complaints processEvery page is reviewed by Charles before it is published and checked against current lender policy and the official scheme pages linked where figures appear.

General information only, not credit, tax, planning or legal advice. Development lending policies, presale requirements and lending ratios vary between lenders and change over time. Planning approvals depend on the site and the council.