The Pros and Cons of Construction Loan Structures

Construction finance works differently to a standard home loan because you're funding something that doesn't exist yet.

The way your construction loan is structured affects how much you pay each month, when those payments start, and how much flexibility you have if the build runs over schedule or if you're managing shift work around settlement and inspections. Most construction loans use progressive drawdown, which means the lender releases funds in stages as the build progresses. You only pay interest on the amount drawn down so far, not the full loan amount. That structure keeps your repayments lower during construction, but it also means your repayments increase each time another progress payment is made.

Progressive Drawdown vs Full Advance: How Funding Timing Changes Your Repayments

Progressive drawdown releases your loan in instalments tied to construction milestones. Full advance pays the builder upfront in one lump sum.

With progressive drawdown, the lender holds back most of the loan amount until each stage is inspected and signed off. You might pay interest on $150,000 after the slab is poured, then $250,000 after frame stage, and so on until the build is finished. Each time a progress payment is released, your interest charges step up. Most lenders charge a Progressive Drawing Fee each time they release funds, typically between $200 and $400 per drawdown, and there are usually five to seven drawdowns depending on the builder's progress payment schedule.

Full advance is rarely used in residential construction because it carries more risk for the lender, but it's sometimes available for owner builders or builders working under a cost plus contract where you're paying actual costs rather than a fixed price. If you're working with a registered builder on a fixed price building contract, progressive drawdown is the standard structure you'll be offered.

Interest-Only Repayments During Construction: What You Actually Pay Each Month

Most construction loans let you make interest-only repayments while the build is underway. You're not paying down the loan amount, just covering the interest on whatever's been drawn so far.

Consider a detective building a custom home on suitable land with a $500,000 construction loan. After the first drawdown of $100,000 for the slab and footings, monthly interest at current variable rates might sit around $500. After the second drawdown brings the total to $250,000, that climbs to around $1,250 per month. By the time frame stage is complete and $350,000 has been released, monthly interest is closer to $1,750. These amounts shift each time another progress payment is made, and they're charged monthly in arrears. Some lenders let you make additional payments during construction to reduce the balance, but most detectives we work with prefer to keep repayments at the minimum during the build and then refinance to a construction to permanent loan once the keys are handed over. That gives you more breathing room if the build runs over schedule or if an unexpected overtime shift means you're not around for a progress inspection.

Fixed Price Contracts vs Cost Plus: How the Builder Agreement Affects Loan Approval

Your construction loan application depends heavily on whether you're building under a fixed price contract or a cost plus contract. Most lenders will only approve construction finance if you're working with a registered builder on a fixed price building contract.

A fixed price contract locks in the build cost upfront. The builder quotes $480,000 to complete the job, and that's what the lender assesses when they approve your loan amount. The progress payment schedule is spelled out in the contract, usually tied to stages like base, frame, lockup, fixing, and completion. The lender knows exactly when funds will be drawn and what each stage should look like during the progress inspection.

A cost plus contract charges you for actual costs plus a margin, which means the final price isn't fixed when you apply for finance. Some lenders will consider cost plus arrangements if you're an owner builder or if the project involves a custom design with variables the builder can't price upfront, but the loan amount usually includes a buffer and the lender will want detailed council plans and a development application already approved before they'll assess the application. If you're building a project home under a house and land package, you'll almost always be working with a fixed price contract, and that's what most construction loan structures are designed around.

The Build Period Requirement: Why Lenders Want You to Start Within Six Months

Most construction loans require you to commence building within a set period from the Disclosure Date, usually six months. If you don't start on time, the loan approval can lapse and you'll need to reapply.

That timeline matters if you're waiting on council approval or if there's a delay with the builder's schedule. Some lenders offer longer build windows, particularly if you're working on a land and construction package where settlement on the land and the start of construction are separated by a few months. If you're buying land first and planning to build later, you'll usually need to take out a standard land loan and then refinance into construction funding when you're closer to breaking ground. The structure you choose upfront affects whether you can hold land without starting construction immediately, or whether you're locked into a timeline that doesn't suit your roster or the builder's availability.

Construction to Permanent Loan: How the Loan Converts When the Build Finishes

A construction to permanent loan starts as construction finance with progressive drawdown and interest-only repayments, then converts automatically to a standard home loan once the build is complete. You don't need to reapply or go through a second approval process.

Most detectives we work with choose this structure because it avoids the need to refinance after handover. Once the final inspection is done and the keys are handed over, the lender switches the loan from interest-only to principal and interest repayments, and the construction loan interest rate usually shifts to the lender's standard variable or fixed rate depending on what you've locked in. Some lenders let you fix the rate at the start of construction, others wait until conversion. If you've been making interest-only payments during the build, your repayments will jump once the loan converts because you're now paying down the principal as well. That increase is something to factor in if you're managing mortgage repayments around shift work or if you've taken unpaid leave during the build period.

Who Handles Progress Inspections and When Payments Are Released

The lender arranges a progress inspection each time the builder requests a drawdown. An independent valuer checks that the stage is complete and matches what's outlined in the progress payment finance schedule.

If the builder has completed frame stage and is requesting $120,000, the valuer will visit the site, check the work, and report back to the lender. Once approved, the lender releases the funds directly to the builder. You're not handling the payments yourself. The builder invoices the lender, the inspection happens, and the money is transferred. That process usually takes five to ten business days from the time the builder submits the drawdown request, so if you're on shift and the builder needs funds to pay sub-contractors like plumbers or electricians, you don't need to be physically present. The builder and lender coordinate it, and you'll get confirmation once the funds have been released and your loan balance has increased.

If you're working on a build while living interstate or if your shifts make it difficult to attend site meetings, the structure of a construction loan is designed to work without needing you there every step of the way. The progress inspection is handled by the lender's valuer, not by you, and the builder manages the day-to-day coordination with contractors and council.

The Structure That Suits Shift Work and Build Delays

Construction loans with progressive drawdown and interest-only repayments give you the lowest monthly outlay during the build. You're only charged interest on what's been drawn, and you're not locked into principal repayments until the build is finished.

That structure works well if you're managing irregular income from shift penalties or if you're putting overtime toward the build but want to keep your committed monthly expenses as low as possible during construction. If the build runs over schedule, you're not carrying the full loan amount the entire time. The trade-off is that your repayments step up each time a progress payment is released, and you'll pay a Progressive Drawing Fee at each stage. For most detectives building a new home, that's a more manageable structure than trying to carry the full loan amount from day one.

If you're considering a renovation instead, the structure changes slightly. A house renovation loan usually works as a single lump sum advance rather than progressive drawdown, particularly if you're doing cosmetic work rather than a full rebuild. If the scope involves structural changes or a second storey, some lenders will treat it like construction funding and offer progress payments tied to stages, but that depends on the size of the project and whether you're working with a licensed builder.

Call one of our team or book an appointment at a time that works for you. We'll walk through which construction loan structure fits your build, your deposit, and your roster, and make sure the drawdown schedule aligns with your builder's timeline and your council plans.

Frequently Asked Questions