Last updated: July 2026 · Reviewed by John Pierre Saliba, Director and Mortgage Broker, MFAA Accredited
How a Construction Loan Works in Sydney
Lend & Loan is a Sydney construction loan specialist with 80 five-star reviews. We compare 50+ lenders for new builds, knockdown-rebuilds, and duplex construction, with progress draw facilities and competitive rates.
A construction loan, also called a progress draw loan or building loan, is a specialist home loan designed to fund the construction of a new property. Unlike a standard mortgage where the full amount is advanced at settlement, a construction loan releases funds in stages as each phase of your build is completed and inspected.
This staged drawdown structure means you only pay interest on the money that has actually been released, not the total approved loan amount. During the construction period, your repayments are interest-only on the drawn balance, significantly reducing your carrying cost while the build is underway. Once construction is complete, the loan converts to a standard principal-and-interest home loan.
The biggest mistake I see is borrowers underestimating their total project cost. Lenders will lend against a fixed-price building contract, but cost overruns, variations, landscaping, driveways, fencing and council fees often add 10–20% on top. I always work through a full project budget before we choose a lender, because running out of funds mid-build is far worse than borrowing slightly more upfront.
The 5 Progress Draw Stages
Most Sydney lenders release construction funds across five standard stages. Each drawdown requires an inspection and sign-off before funds are released:
- Stage 1, Slab / base (10–15%): Footings poured and slab completed. First drawdown released after council or private certifier inspection.
- Stage 2, Frame (20–25%): Wall and roof frames erected, windows and external doors in place.
- Stage 3, Lock-up (20–25%): External walls, roofing, external doors and windows installed. Property is now lockable.
- Stage 4, Fixing / fit-out (20–25%): Internal plasterwork, internal doors, kitchen, bathroom and laundry fitout, flooring.
- Stage 5, Practical completion (15–20%): All work complete, occupation certificate issued. Final drawdown released.
Worked Example: $900,000 Construction Loan in Western Sydney
Here's how the numbers work for a typical new build in Sydney's west in 2026:
- Land value (as security): $550,000
- Fixed-price building contract: $900,000
- Estimated completed value: $1,450,000
- Construction loan approved: $900,000 (62% LVR on completed value)
- After slab drawdown ($135,000 drawn): Interest-only ≈ $740/month at 6.59% p.a.
- At lock-up ($495,000 drawn): Interest-only ≈ $2,718/month
- At practical completion (fully drawn): Converts to P&I, repayments ≈ $5,790/month over 25 years
Types of Construction Loans We Arrange
House and Land Package Loans
If you're buying a house and land package in a new estate, the land component settles first under a standard home loan. The construction loan then funds the build in a separate facility. Popular corridors include Marsden Park, Leppington, Oran Park, Box Hill and Schofields. We manage both components so the timing works seamlessly.
Knockdown Rebuild Loans
Knockdown rebuild (KDR) projects use your existing property as security. Most lenders fund both the demolition cost and the new build under one facility. Key considerations include your current LVR, demolition approvals from council, and whether you'll remain on-site during construction. In Sydney's inner suburbs where land values are high, KDR is often the smartest path to a new home without leaving the street.
Duplex Construction Loans
Building a duplex introduces additional complexity around lender appetite, LVR caps and exit strategy. Some lenders treat duplexes identically to single dwellings; others apply commercial criteria if you intend to sell individual lots. We have specific experience placing duplex construction finance with lenders who understand Sydney's dual occupancy market. See our dedicated duplex construction loans page for more.
Owner Builder Loans
Owner builder finance is among the most specialised areas of construction lending. Maximum LVR is typically 60%, and most lenders require an owner builder permit from NSW Fair Trading, a quantity surveyor cost report, home warranty insurance, and demonstrated building experience. We work with the select lenders who actively support owner builders and help you prepare the documentation package that gives your application the best chance of approval.
Investment Property Construction
Building an investment property changes the tax equation. During the interest-only construction period, interest on drawn funds is generally deductible. On completion, you're eligible to depreciate the new build. We regularly work with investors building in Sydney's growth corridors and structure the loan for maximum tax efficiency from day one.
Documentation Required
Construction loan applications require more documentation than standard home loans. Here's what we gather:
- Fixed-price building contract signed by a licensed builder
- Council-approved plans and development approval (DA)
- Builder's licence, public liability insurance and home warranty insurance
- Soil test and engineering reports (if required)
- Evidence of land ownership or land contract of sale
- Standard income documents, payslips, tax returns, or financials if self-employed
We run through this checklist with you upfront so your application isn't delayed by missing documents once it's lodged.
A common error is choosing a construction loan purely on rate. The rate matters, but so does the lender's construction team. Some lenders process progress drawdowns quickly; others are slow, and a delayed drawdown can put you in breach of your builder's payment schedule. I select lenders based on both rate and operational track record on construction loans specifically.
Common Construction Loan Pitfalls
- Underestimating total cost: Build contracts exclude site costs, council fees, landscaping and appliances. Budget 10–15% above your contract price.
- Insufficient contingency: Lenders don't fund variations. Keep a cash buffer of at least 5–10% of the contract price.
- Letting pre-approval expire: Construction loan pre-approvals are valid for 3–6 months. Contact us before it lapses, don't let it go quietly.
- Wrong loan product: Variable construction loans convert to standard variable at completion. If rates are expected to rise, locking the end rate at application can save real money.
- Booking a builder too late: Fixed-price contracts are required for finance, but good Sydney builders are booked 6–12 months ahead.
