Owner-Builder & Construction Loans
What Is a Construction Loan and How Does It Work
A construction loan is a specialised facility that releases funds in stages — called progress draws — as your build reaches specific milestones: slab down, frame up, lock-up, fixing stage, practical completion. Unlike a standard home loan where you get the full amount at settlement, a construction loan starts as land finance (if you’re buying the block separately) then converts to a building facility once council approves the plans.
The lender values the property at completion, not at today’s land value. If your block in Baldivis is worth $180,000 and your approved building quote totals $420,000, the bank lends against a $600,000 end valuation. At 90% LVR, that’s a $540,000 loan — but you still need to cover the 10% deposit ($60,000) plus Lenders Mortgage Insurance, application fees, valuation, conveyancing, and builder’s risk insurance before the first draw.
Most lenders require builder’s risk insurance (also called home owner warranty or contract works insurance) from day one. This covers the structure during construction if the builder walks off site, goes insolvent, or if storm damage occurs mid-build. Owner-builders face stricter requirements: you’ll need an owner-builder permit from the Building Commission, proof of builder’s risk cover in your name, and often a higher deposit (15–20% instead of 10%) because the lender sees higher completion risk.
Draws are triggered by an independent valuer or the bank’s construction manager inspecting the site and certifying that the stage is complete. The funds go to the builder (or to you as owner-builder), not into your offset account. Interest is charged only on the drawn amount, so in the first few months your repayments are lower — but they climb as each stage completes. Once the final draw is paid and you get occupancy approval, the loan converts to a standard variable or fixed home loan and you start principal-and-interest repayments on the full amount.
Andy’s been arranging construction loans since 2003 — back when most brokers wouldn’t touch them because the paperwork was harder. He walks you through the council approval timeline, explains what the valuer looks for at frame stage, and lets you know which lenders will accept your builder if they’re not on the bank’s preferred panel.
Why Work with a Broker on a Construction Loan
Lender Panel Knowledge
Not every builder is on every bank’s approved list. Andy knows which lenders accept boutique builders, which require HIA membership, and which will finance an owner-builder at all. He matches your builder to the panel before you apply so you don’t waste time on a declined application.
Draw Schedule Walkthrough
He explains exactly when funds release, what the valuer inspects at each stage, and how long each draw takes to clear — typically 5-10 business days from inspection to payment. You’ll know when to book trades and when to expect the next chunk of cash.
Insurance Sorted Early
Builder’s risk insurance has to be in place before the first draw. Andy connects you with brokers who write contract works policies and checks the coverage matches the lender’s requirements so settlement doesn’t stall at the last minute.
Plain-English Loan Docs
Construction loan documents run to 40-60 pages and include clauses about retention amounts, interest capitalisation, and what happens if you run over budget. Andy walks you through every section before you sign so you’re not surprised when the surveyor visits.
| Criterion | Standard Construction Loan | Owner-Builder Loan |
|---|---|---|
| Minimum deposit | 10% of completed value (plus LMI if <20%) | 15–20% of completed value; some lenders require 20% cash |
| Builder requirements | Registered builder on lender’s panel; HIA or MBA membership preferred | Owner-builder permit from Building Commission; builder’s risk insurance in owner’s name |
| Builder’s risk insurance | Builder arranges and lender verifies coverage | You arrange and pay; lender requires policy noting their interest |
| Draw inspection | Independent valuer or construction manager certifies stage completion | Valuer and sometimes council sign-off required; lenders more cautious at lock-up and fixing stages |
| Interest rate | Standard construction variable rate (typically 0.1–0.2% above standard variable) | Often 0.2–0.4% above standard variable due to higher perceived risk |
| Completion timeline | Lender allows 12 months from first draw; extensions negotiable | Lender expects 12 months; tighter scrutiny if you’re behind schedule after 9 months |
| Eligible lenders | Most major banks and regionals | Fewer lenders; some non-bank specialists accept owner-builders, others decline outright |
Andy’s advice: if you’re confident managing trades and have built before, an owner-builder loan saves the builder’s margin (typically 15–20% of contract value). But if this is your first build, the extra deposit, higher rate, and tighter draw approvals mean the risk often outweighs the saving. He’ll run both scenarios with real numbers before you commit.
How Construction Loan Approval and Drawdown Works
Land Purchase or Valuation
If you’re buying land separately, the lender values it first and settles that portion as a land loan. If you already own the block, they value it based on current zoning and council plans. You’ll need a copy of the building contract and council-approved plans before the construction component is assessed.
Building Contract and Insurance
Submit your signed building contract (or owner-builder cost breakdown), builder’s licence and insurance details (if using a builder), and proof of builder’s risk insurance. The lender checks the builder is on their panel or, for owner-builders, that your permit and insurance meet their requirements. This stage takes 5-10 business days.
Loan Approval and Construction Facility
Once approved, you receive a formal loan offer detailing the total facility, draw schedule (typically 5-6 stages), interest rate during construction, and what documents the valuer needs at each stage. You sign, pay application and valuation fees, and the land portion (if separate) settles first.
First Draw — Slab or Base Stage
When the slab is poured and council issues a frame inspection clearance, your builder (or you) requests the first draw. The lender’s valuer inspects, certifies the stage is complete to contract spec, and the bank releases funds to the builder’s account (or yours if owner-builder). Turnaround: 5-10 business days from inspection request.
Subsequent Draws — Frame, Lock-Up, Fixing, Completion
Each stage follows the same process: reach the milestone, request inspection, valuer certifies, funds release. At lock-up (roof on, windows in), lenders become stricter — if you’re behind schedule or over budget, they may freeze the next draw until you inject more cash or the builder provides an updated cost estimate.
Final Draw and Loan Conversion
Once you get practical completion and occupancy certificate from council, the lender releases the final draw and converts the construction facility to a standard principal-and-interest home loan. Your repayments jump to the full loan amount. If you’ve been paying interest-only during construction, this is when P&I kicks in — plan for a $400-$800/month increase on a $500,000 loan.
What People Get Wrong About Construction Loan Deposits
Most banks quote a construction loan at ‘90% LVR’ but don’t explain that the 90% applies to the completed value, not your land-plus-build cost. If your land in Rockingham is worth $180,000 and your build quote is $420,000, the total project cost is $600,000. At 90% LVR, the bank lends $540,000 — which sounds like a $60,000 deposit (10%).
But here’s the catch: you need that $60,000 plus Lenders Mortgage Insurance (around $12,000-$18,000 on a $540k loan at 90% LVR), valuation fee ($600-$800), application fee ($600), conveyancing ($1,200-$1,800), council and water connection fees ($3,000-$6,000 depending on the shire), and builder’s risk insurance ($1,500-$3,000 for a 12-month build). Add it up and you’re closer to $80,000 in cash before the first draw, not $60,000.
Owner-builders face a steeper climb: most lenders want 15-20% deposit in cash (not equity), so on that same $600k project you’d need $90,000-$120,000 liquid plus all the costs above. Andy’s seen families assume they can roll settlement costs into the loan — you can’t. Every dollar of stamp duty, insurance, and fees comes out of your pocket before the slab goes down.
The other mistake: underestimating the time between draws. If your builder quotes a 9-month build and the lender allows 12 months from first draw, that sounds fine. But if wet weather delays frame stage by 6 weeks and the electrician is booked out another month, you’re now at 11 months before lock-up. If the final draw pushes past 12 months, some lenders charge a higher interest rate (0.5-1% more) or require a formal loan variation. Andy’s advice: budget for a 14-month build timeline in your head, even if the contract says 9. The extra breathing room keeps the lender happy and stops you panicking if trades run late.
Construction Loan Rates and Fees in 2025 Fees
Construction loan interest rates in 2025 sit around 6.2-6.8% variable for standard builds with a registered builder, and 6.5-7.2% for owner-builders. During the construction phase, you pay interest only on the drawn amount — so if you’ve drawn $200,000 of a $540,000 facility, you’re paying interest on $200k, not the full loan. Repayments start low (around $1,000-$1,200/month on that $200k) and climb with each draw. Once the build completes and the loan converts to a standard home loan, you switch to principal-and-interest repayments on the full amount — expect that monthly figure to jump to $3,400-$3,800 on a $540k loan at 6.5%.
Lenders Mortgage Insurance applies if your deposit is under 20% of the completed value. On a $540,000 loan at 90% LVR (10% deposit), LMI typically costs $12,000-$18,000 and is added to your loan balance — you don’t pay it upfront, but it increases your total borrowing and interest bill over 30 years.
Valuation and application fees: most lenders charge $600-$800 for the initial land-plus-construction valuation, then $300-$400 for each progress draw inspection (5-6 inspections across a typical build). Some lenders bundle inspection fees into the loan; others bill you per visit. Application fees run $600-$900.
Builder’s risk insurance is your biggest upfront cost after the deposit. Premiums range from $1,500 to $3,000 for a 12-month build, depending on contract value and insurer. Owner-builders pay at the higher end because insurers see them as higher risk. The policy covers storm damage, fire, theft of materials, and builder insolvency. It’s non-negotiable — no insurance, no draw.
Andy’s rule: add $25,000-$35,000 to your deposit for all the soft costs (LMI, insurance, fees, legals, connections). If your deposit is exactly 10% and you’ve got nothing left over, you’ll stall at first draw.
Owner-Builder & Construction Loan Questions Perth Families Ask
Yes, but fewer lenders accept owner-builders and the requirements are stricter. You’ll need an owner-builder permit from the WA Building Commission, builder’s risk insurance in your name with the lender noted as interested party, and typically a 15-20% deposit instead of 10%. Some lenders require the full 20% in cash (not equity) and charge a higher interest rate — usually 0.2-0.4% more than a standard construction loan. Andy knows which lenders will consider owner-builders and which decline outright, so he matches you to the right panel before you apply.
For a standard construction loan with a registered builder, lenders quote 10% of the completed property value. But you also need to cover Lenders Mortgage Insurance (if borrowing above 80%), valuation and inspection fees, application fees, builder’s risk insurance, conveyancing, and council/utility connection costs. In practice, budget for 15-18% of the total project cost in liquid cash before the first draw. Owner-builders need 15-20% deposit minimum, and most of that must be genuine savings or equity, not a gift or bonus.
If your builder submits a variation to the contract that pushes the total cost higher, the lender reassesses your borrowing capacity and may require you to inject more cash before releasing the next draw. If the build runs past the agreed 12-month construction period, some lenders increase the interest rate by 0.5-1% or freeze further draws until you provide an updated completion timeline and cost breakdown. Andy’s advice: choose a builder with a track record of finishing on time and get a fixed-price contract with a clear variations clause. And always keep a $10,000-$15,000 buffer in your offset for unexpected costs.
Yes — you pay interest only on the amount drawn so far, not the full loan. For example, if you’ve drawn $200,000 of a $500,000 facility at 6.5%, your monthly interest bill is around $1,083. As each draw releases, your repayments climb. Once the build completes and the loan converts to a standard home loan, you switch to principal-and-interest repayments on the full amount — on a $500k loan that’s typically $3,200-$3,600/month. Plan for that jump in your budget before you start building.
From the day you (or your builder) request an inspection to funds hitting the builder’s account, allow 5-10 business days. The lender books the valuer, the valuer visits site (usually within 2-3 days), writes a short report certifying the stage is complete, and the lender’s credit team approves the draw. If it’s a public holiday period or the valuer finds the stage isn’t quite finished (e.g. frame up but scaffolding still in place), add another week. Andy’s rule: book your next trade 2 weeks after you expect the draw to clear, not the day after.
Builder’s risk insurance (also called contract works or home owner warranty insurance) covers the structure during construction if the builder becomes insolvent, abandons the site, or if storm, fire, or theft damages materials before practical completion. For a standard construction loan, the builder arranges it and you pay the premium (usually rolled into the contract price). For owner-builders, you arrange and pay for the policy directly — premiums run $1,500-$3,000 for a typical 9-12 month build in Perth. The lender must be noted on the policy as interested party, and they won’t release the first draw until they’ve sighted the certificate of currency.
Yes — if you have at least 20% equity in your existing property (it’s worth $500k and you owe $350k or less), you can use that equity as your deposit for the new build. The lender secures both properties and you don’t need to sell or inject cash. This is common for families upgrading from a smaller home in Mandurah or Rockingham to a new build in Baldivis or Pinjarra. Andy structures it so your repayments during construction stay manageable, then refinances both loans once the new house is finished and you’ve sold the old one (if that’s the plan). He’ll walk you through the numbers before you commit so you’re not stretched too thin if the build takes longer than expected.
For a standard construction loan: signed building contract with itemised schedule of works, builder’s licence and insurance certificates, council-approved building plans, soil and contour reports if the block is sloping or fill, proof of deposit (bank statements showing savings), two years’ tax returns or payslips, and your existing home loan statements if you’re using equity. For owner-builders, add your owner-builder permit, detailed cost breakdown by trade (not just a lump sum), and builder’s risk insurance quote or certificate. Andy reviews everything before lodgement so you’re not chasing missing documents mid-application.
Yes — most lenders require two years’ financials (tax returns plus Notice of Assessment), but some accept 12 months if your ABN is older and your BAS statements show consistent income. If you’re a tradie building your own home as an owner-builder, a few specialist lenders offer low-doc construction loans using bank statements and BAS only, though the rate is typically 0.5-0.8% higher and deposit requirements jump to 20%. Andy arranges both full-doc and low-doc construction loans for self-employed buyers; he matches your documentation to the lender’s policy so you don’t apply with a bank that will decline you on ABN age alone.
Andy works across the Perth southern corridor and Peel region: Mandurah, Baldivis, Rockingham, Secret Harbour, Singleton, Lakelands, Pinjarra, Waroona, and out to Yarloop and Harvey for rural or large-block builds. He knows which councils move fast on building approvals (Mandurah typically 6-8 weeks, Rockingham 8-10 weeks) and which lenders finance in bushfire-prone or flood-overlay areas without loading the rate. If you’re building on a battle-axe block or a rear strata lot, he’ll tell you upfront which lenders will touch it and which won’t.
Any change that increases the contract value requires the builder to issue a variation and the lender to approve the higher loan amount. If the variation pushes your LVR above the original approval (e.g. from 90% to 92%), the lender may decline the extra funds and you’ll need to pay the variation cost in cash. Minor changes that don’t affect the total contract price (swapping tiles, upgrading taps) don’t need lender approval, but the builder must document them so the valuer knows the spec hasn’t dropped. Andy’s advice: lock in all your selections and colours before you sign the building contract. Post-contract variations cost 20-30% more than if you’d chosen them upfront, and they can delay your draw schedule if the lender reassesses mid-build.
He explains the draw schedule in plain language, walks you through what the valuer looks for at each stage, connects you with a builder’s risk insurance broker, and lets you know when to expect each chunk of cash so you can book trades in advance. Most first-time builders underestimate how much admin is involved — council inspections, engineer sign-offs, variation paperwork. Andy’s been arranging construction loans since 2003; he knows the timeline, the pitfalls (wet weather delays, trade shortages, budget blowouts), and which lenders are flexible if something goes sideways. You get his mobile number and he answers when you call at 7pm because the builder just rang about a soil issue and you don’t know if it affects the next draw.
Experience You Can't Shortcut
Andy’s been a mortgage broker in Perth since 2000 — just two years after broking began in WA. He’s seen every lender policy shift, every construction boom and bust, and every trick builders and lenders pull when budgets blow out or trades disappear.
He works with families in Mandurah, Baldivis, Rockingham, and across the Peel region who are building their first home, upgrading to acreage, or managing an owner-builder project. His clients come back for the next purchase, the investment property, the refinance, because he keeps working for them after the final draw clears — not just until settlement.
You deal with Andy directly from the first conversation about your block and building contract through to the last draw and loan conversion. No junior processing your file while the senior broker chases the next lead. You get his mobile, he answers at night when the builder rings with a problem, and he explains every line of the loan documents before you sign. That’s the difference between a broker who’s done this for 25 years and one who started last year.
Reviewed by
Credit Representative & Mortgage Broker
The information on this page has been reviewed for accuracy by Andy Iriks, a Credit Representative & Mortgage Broker at Wanna Finance. It is general information only.







