How a Construction Loan Works: The 5 Progress Inspection Stages Explained

Building a brand new home on the Gold Coast or in the Northern Rivers region is an exciting milestone. Whether you have secured a block in a new estate or are embarking on a knockdown rebuild project closer to the beach, watching your vision come to life is incredibly rewarding.

However, funding a build is completely different to buying an established home. With a standard property purchase, the bank releases the entire loan amount to the vendor on settlement day. With a construction project, handing over hundreds of thousands of dollars to a builder before they have laid a single brick would be highly risky for both you and your lender.

To manage this risk, lenders use a construction loan structure that relies on a progressive drawdown process. This means your loan funds are released in chunks over time, strictly aligning with specific milestones in your building contract.

Understanding how these stages work, what happens during progress inspections, and how interest is calculated will save you a massive amount of stress during the building process.

The Architecture of Progressive Drawdowns

The foundational rule of a construction loan is that you only ever pay for work that has actually been completed. This structure provides a crucial layer of financial protection. If a building company experiences delays or faces financial difficulties halfway through your project, the remaining funds stay safely inside your loan account rather than sitting in the builder's bank account.

This structure is also highly beneficial for your daily cash flow. Throughout the construction period, you are only required to make interest only repayments on the specific amount of money that has been drawn down so far, rather than the total approved loan limit.

For example, if your total construction loan budget is 400,000 dollars but your builder has only drawn down 50,000 dollars to complete the initial foundations, your monthly mortgage repayment is calculated solely on that 50,000 dollars. As the build progresses and more money is released, your monthly interest only repayments will scale up accordingly. Once the final stage is complete, the loan will typically convert to a standard principal and interest repayment structure.

Before your builder can start work, the bank requires an industry standard fixed price building contract. This contract must contain a progress payment schedule that divides the total cost of the build across five standard construction stages.

Stage 1: The Foundations and Slab Stage

The first physical phase of construction involves preparing the site and creating the footprint of your new home. This stage begins once your local council has approved the building plans and your lender has issued a formal commencement letter to your builder.

During this stage, the building team will clear the land, level the ground, excavate the soil, and install underground plumbing and drainage lines. They will then set up the wooden formwork, lay down steel reinforcement mesh, and pour the concrete slab. If you are building a home on a steep slope or in an area requiring elevated construction, this phase may involve driving deep piers or building structural brick base walls instead of a flat concrete slab.

Lenders typically allocate around 10 to 15 percent of the total building contract value to this stage. This percentage often includes the initial 5 percent deposit you paid to the builder when signing the contract to cover insurance, working drawings, and initial council filing fees.

Stage 2: The Frame Stage

Once the concrete slab has fully cured and dried, your home begins to take on a three dimensional shape. This is widely considered the most visually exciting phase for homeowners because the actual layout of the rooms becomes clear over the course of just a few weeks.

During the frame stage, the builders will erect the structural skeleton of the house. This includes installing the timber or steel wall frames, standing the support posts, and securing the roof trusses. The team will also install the structural lintels over window spaces and door openings, and they may complete initial plumbing and electrical conduits within the wall cavities.

Lenders generally release about 15 to 20 percent of the total loan funds upon the successful completion of the frame stage. At this point, a building inspector will typically check that the frame complies with Australian engineering standards before work moves forward.

Stage 3: The Lock Up Stage

The primary goal of the third stage is to make the entire structure completely weatherproof and secure, allowing internal work to begin without the risk of rain or wind damage.

During the lock up stage, the builder will install the external wall linings or finish the structural brickwork. They will also lay the roof tiles or install the metal roofing sheets, and fix the gutters and downpipes. Most importantly, all external windows and sliding doors are fitted into the frame, and the main external doors are hung. Once this stage is finished, the builder can literally lock the front door to protect the building materials inside.

Because this phase requires a massive amount of heavy building materials, it typically accounts for around 20 to 25 percent of your total construction loan funds.

Stage 4: The Fixing or Fit Out Stage

With the home sealed from the elements, the focus shifts entirely to the inside of the property. This stage transforms a bare structural shell into a liveable house by installing all the internal components.

During the fixing stage, insulation batts are placed in the walls and ceilings, and plasterboard sheets are fixed to the framing to create smooth interior walls. Carpentry teams will install the internal doors, architraves, skirting boards, and window sills. This is also when the fixed cabinetry is built, including kitchen cupboards, bathroom vanities, and built in wardrobe carcasses. Initial plumbing and electrical wiring are pulled through the walls to prepare for future taps and power points.

This is often the largest single invoice stage in a building contract, usually requiring a drawdown of approximately 30 percent of the total construction budget.

Stage 5: The Practical Completion Stage

The final stage covers all the finishing touches, detailed trades, and rectifications required to make the home ready for you to move into.

During this phase, painters will complete the internal and external walls, tiling is completed in wet areas, and floor coverings like carpet, timber, or polished concrete are laid. Electricians and plumbers return to fit the actual light switches, power outlets, light fixtures, taps, toilets, and appliances. Any external contract items included in your building schedule, such as basic landscaping, driveways, or fencing, will also be finalized.

This final stage represents the remaining 10 percent of your building contract. However, the bank will not release this final payment automatically just because the builder sends an invoice.

The Role of Progress Inspections and Valuations

Every time a stage is completed, your builder will issue a progress claim invoice. To get this invoice paid, you must sign a progress payment instruction form and send it to your mortgage broker or lender along with the builder's invoice.

For the middle stages of a build, lenders will often review the invoice and release the funds directly to the builder's bank account within a few business days. However, at critical milestones—especially at the slab stage and prior to the final completion payment—the bank will send an independent property valuer to the construction site.

The valuer conducts a progress inspection to physically verify that the work matches the invoice. They check that the slab has been poured correctly, that the house is actually at lock up stage, or that all the fixtures are installed as specified. This process ensures the builder is not front loading the contract by asking for more money than the value of the physical work completed on site.

Before the very last payment is released at practical completion, the bank requires a specific set of documents to protect your legal and financial position:

• A formal Certificate of Occupancy or Interim Occupancy Certificate issued by your local council or private building certifier, confirming the home is legally safe to live in.

• A building insurance cover note listing your lender as an interested party, protecting your brand new asset against fire or storm damage from day one.

• A signed practical completion notice showing that you have completed a walk through with the builder and are satisfied with the quality of the finish.

Navigating Contract Variations

It is incredibly common to make small changes to your home design during a build, such as upgrading your kitchen benchtops or adding extra power points. These changes are processed through formal documents called contract variations.

An important educational point to remember is that lenders base your construction loan approval strictly on the original contract price submitted during the initial application. If you sign off on 20,000 dollars worth of luxury upgrades halfway through the build, the bank will generally expect you to pay for those variations out of your own personal savings before they continue releasing loan funds.

Keeping a cash buffer tucked away outside of your construction loan is the smartest strategy to handle these unexpected design changes without halting progress on site. By mapping out your five payment stages and aligning them with your cash flow beforehand, you can step through the construction process with complete confidence.