Building Inspection Stages Explained
Every new Queensland home moves through the same six inspection stages. Here's what each stage covers, why it matters, and the defects we catch at each one — before the next trade covers the work for good.
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We inspect across South East Queensland
Why a new home is inspected in stages
A new home is built up in layers, and each layer permanently hides the one beneath it. Concrete buries the slab reinforcement and termite barriers. Plasterboard covers the frame, its bracing and tie-downs. Tiles seal the waterproofing membrane in for the life of the home. By the time the house looks finished, most of what determines whether it was built correctly is already hidden.
Stage inspections exist because of that sequence. Each one is timed to a hold point — the narrow window after one trade finishes and before the next covers their work — so a defect can still be seen and rectified cheaply, rather than surfacing years later behind a wall or under a floor. The earlier a defect is caught, the less it costs to fix: a torn vapour barrier is free to replace before the pour and a major problem afterwards.
Your builder's private certifier attends key stages and issues Form 16 and Form 21 certificates confirming the work meets the building approval — a regulatory compliance check, not an assessment carried out for you. An independent VG Inspect stage inspection is the buyer-facing check: every accessible element assessed against the relevant Australian Standard, the National Construction Code and the QBCC Standards and Tolerances Guide, with each defect photographed and tied to the specific clause it breaches.
The best value in a new build is catching defects at the stage they occur — not at handover, and not after you've moved in.
The six stages, in order
Jump to any stage to see what it covers, why it matters and the defects we commonly find.
Pre-Pour Slab Inspection
The pre-pour is carried out after the formwork, reinforcement steel, termite barriers and vapour barrier are in place and before concrete is poured. It is the single most time-critical inspection of the entire build — once the truck arrives the window closes permanently.
When it happens
After formwork, reinforcement, termite and vapour barriers are set — before the concrete truck arrives. You typically get 24–48 hours' notice.
Why this stage matters
Everything checked at pre-pour is buried under concrete within hours and can never be seen again. Defects found here cost nothing to fix; the same defects found after pouring require core sampling, engineer assessment and potentially slab rectification at enormous cost. No other stage offers this return on investment.
What we check
- Reinforcement steel placement and concrete cover — AS 2870
- Bar chair spacing, splice lap lengths and edge beam reinforcement
- Vapour barrier integrity — cuts, tears and penetrations taped
- Termite barrier installation and collars on all pipe penetrations — AS 3660.1
- Pipe and conduit placement, waffle pods, formwork and site cleanliness
Defects commonly caught here
- Insufficient concrete cover or steel sitting on the ground
- Torn or unsealed vapour barrier that will let ground moisture through the slab
- Missing termite collars around plumbing penetrations
- Bar chairs spaced too widely, letting the steel sag out of position during the pour
Slab Inspection
The slab inspection assesses the finished, cured concrete after the pour and before the frame goes up. Where the pre-pour checks what goes into the slab, the slab inspection checks the result: levelness, surface finish, edge beams and drainage falls against the QBCC Standards and Tolerances and AS 2870.
When it happens
After the concrete has cured — typically 7–14 days after the pour — and before frame delivery begins.
Why this stage matters
Issues identified at slab stage — before the frame is loaded onto it — are far easier and cheaper to address than the same issues found at handover. A slab out of level, or with inadequate perimeter drainage falls, creates problems that compound through every stage that follows.
What we check
- Slab levelness — QBCC S&T tolerance 10mm across any room
- Surface finish suitability for the applied floor coverings
- Edge beam condition — honeycombing and exposed steel
- Slab crack assessment — Category 1 through 4
- Drainage falls around the perimeter, away from the building
Defects commonly caught here
- Finished floor level out of tolerance under a 2m straightedge
- Honeycombing or exposed reinforcement to the edge beams
- Category 3–4 movement cracks needing structural engineer assessment
- Perimeter falls that pond water against the slab rather than draining away
Frame Stage Inspection
The frame inspection is carried out after the structural framework is erected and before internal wall linings and plasterboard are installed. Along with the pre-pour, it is one of the two most critical stages — defects found at frame stage can still be rectified; once plaster goes on, they cannot.
When it happens
After your builder's certifier has approved the frame — but before plasterboard installation begins. You typically have a 1–2 week window.
Why this stage matters
The frame is your home's skeleton. Incorrect bracing, missing tie-downs and non-compliant truss connections are straightforward to fix before plastering, but the same defects discovered after handover require walls to be opened. This is the most cost-effective intervention point in the entire build.
What we check
- Structural frame compliance — AS 1684.2 (timber) and steel framing
- Bracing nail patterns, strap installations and shear blocks
- Tie-down bolts, rod connections and chemset anchors
- Truss installation, saddle fixings and bracing — AS 4440
- Brick veneer cavity clearance, wall wrap and window/door fixings
Defects commonly caught here
- Missing or under-fixed tie-downs and bracing straps
- Non-compliant truss connections and saddle fixings
- Bottom plate fixings short of the required spacing
- Brick cavity clearance below the 25mm minimum, bridging the frame to moisture
Enclosed / Lock-Up & Waterproofing Inspection
The enclosed (lock-up) and waterproofing inspection is carried out once external cladding, windows and doors are installed and after the wet-area membrane is applied — before tiling begins. It is the critical checkpoint for waterproofing in showers, bathrooms, laundries and balconies, and the point at which the external envelope is verified.
When it happens
After the wet-area membranes have been applied and cured — but before any tiling commences.
Why this stage matters
Waterproofing failures are the highest-consequence defect category in new Queensland homes. A failed shower membrane not caught before tiling means tiles, screed and often wall linings have to be stripped out and reinstated — weeks of downtime and multiple trades. Caught before the tiles go on, it is typically a quick fix for the waterproofer.
What we check
- Shower, bath and laundry membrane height, coverage and junctions — AS 3740
- Balcony and alfresco waterproofing and drainage falls
- External cladding, brickwork and articulation joints
- Roof cladding, flashings, gutters and downpipe connections
- Window and door seals, head flashings and drainage holes
Defects commonly caught here
- Membrane upturns below the required height at the shower walls
- Pinholes or missed coverage at floor-to-wall junctions where water collects
- Unsealed or short-lapped window and roof flashings
- Wet-area falls that don't run to the floor waste, leaving water pooling
Practical Completion Inspection (PCI)
The PCI — also called the handover inspection — is the independent assessment of your finished home before you accept the keys. Walls are plastered, floors laid and fixtures installed. It is the final opportunity to identify defects and have them rectified at the builder's cost before you take possession.
When it happens
Once your builder notifies you of a handover date — ideally 3–5 business days before you accept the keys. Never sign handover documents first.
Why this stage matters
This is the moment of greatest leverage and greatest risk. Before you sign, your builder is contractually obliged to rectify legitimate defects before receiving final payment. Once you sign, outstanding items move into the slower statutory 12-month defect liability process. An independent, clause-referenced report handed over before you sign keeps the obligation on the builder's side of the line.
What we check
- Every accessible area against QBCC Standards & Tolerances, the NCC and the relevant Australian Standards
- Roof, cladding, brickwork, windows, doors and external sealants
- Wet-area waterproofing, internal finishes, joinery and fixtures
- Electrical GPOs, safety switches, plumbing fixtures and drainage
- Contract-specification items — what you paid for, confirmed as installed
Defects commonly caught here
- Paint, plasterboard and tiling defects assessed against the QBCC viewing test
- Site drainage and finished levels ponding water against the slab
- Incomplete contract-specification items and missing compliance documentation
- Safety switches (RCDs) not installed or not tripping on test
Which stages should you book?
You don't have to book every stage — though full coverage is the safest path. If you're choosing where to spend, the four highest-risk moments in a modern build are the ones where a defect gets permanently buried:
- Pre-Pour — the only chance to verify slab steel, termite and vapour barriers before concrete hides them.
- Frame — the last look at structural bracing and tie-downs before plasterboard covers the timber.
- Waterproofing — the one window to confirm the wet-area membrane before tiles seal it in.
- PCI — the final, most comprehensive check before you sign handover and your leverage drops.
Add the slab inspection for complete stage coverage from footing to handover.
QBCC-Licensed Builder-Inspectors
Every VG Inspect inspector is a builder first, holds their own QBCC licence, and every report is checked before it's sent
QBCC-Licensed Builder-Inspectors
Every inspector is a licensed QBCC builder who has built hundreds of homes
Builders first — fully insured
If an inspector hasn't built a couple of hundred homes, they don't inspect yours. Each holds their own QBCC licence, and every report is checked before it's sent.
Explore each inspection stage
Each stage has its own page with the full checklist, pricing and booking window.
Building inspection stage FAQs
Common questions about stage inspections on Queensland new-home builds.
What are building inspection stages?
Building inspection stages are independent QBCC-licensed inspections carried out at each critical hold point during the build of your new home — not after. Each stage happens where the next trade will cover the previous work: pre-pour before concrete goes down, frame before plasterboard covers the timber, waterproofing before tiles hide the membrane, and PCI before handover. Every stage is an opportunity to catch defects while they can still be fixed easily.
Which stages should I book on a Queensland new home?
The typical high-value schedule is Pre-Pour (24–72 hours before the concrete pour), Frame (after frame is up, before plasterboard), Waterproofing (after the membrane, before tiling), and PCI (a few days before handover). That covers the four highest-risk moments in a modern build. The Slab inspection (post-pour) rounds out full stage coverage from footing to handover.
How much do stage inspections cost?
Stage inspections are $550 per stage including GST. Practical Completion (PCI) is $660 for homes under 220m² (larger homes quoted individually). Every fee includes the same-day standards-referenced report with photographs and Australian Standard / QBCC / NCC clause references.
What's the difference between a stage inspection and the certifier's inspection?
Queensland uses a private-certifier system. Your builder appoints a certifier who attends key stages and issues Form 16 and Form 21 certificates confirming compliance with the building approval — a regulatory check. The certifier is not contracted to identify cosmetic defects, finish quality, contract-specification omissions, or items inside QBCC Standards and Tolerances but outside the approval. A VG Inspect stage inspection is the independent, buyer-facing assessment that picks up those items.
What if the builder is already at PCI and I haven't booked any stage inspections?
Not too late. The PCI catches finishes, workmanship, drainage and everything visible at handover. What's lost is verification of what's buried behind plaster, tiles and concrete — the structural and waterproofing checks from pre-pour, frame and waterproofing stages. Book the PCI now to catch what's still catchable, and for your next build book from pre-pour.
What happens if defects are found at a stage inspection?
Every defect goes in the report with a photograph, its exact location and the AS/NCC/QBCC clause it breaches. You hand the report to your builder's site supervisor — under the Domestic Building Contracts Act and the QBCC Standards and Tolerances Guide, your builder is responsible for rectification at their cost. Typically defects flagged at a stage inspection are rectified before the next stage proceeds.
Not ready to book yet?
Get the free stage-by-stage checklist — the six inspection stages on one timeline, when to book each one, and the questions to ask your builder at every stage. We'll also send a reminder as each stage comes up on your build.
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The whole build on one timeline — the six inspection stages, when to book each one, the questions to ask your builder at every stage, and how the full-build package works.
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