The 6 Stages of Building a House in Australia — and What to Check at Each

You've signed a building contract, the deposit is paid, and someone mentions you're "going to slab next month." You nod — because what else are you going to do? — and realise you don't actually know what the next twelve months look like.

That's normal. Most first-time builders understand the destination (keys, moving boxes, the kitchen you pinned on Pinterest) far better than the journey. But the journey is where the money goes, the decisions pile up, and the problems get hidden under tiles if nobody is paying attention.

This guide walks through the six stages of building a house in Australia — the sequence most residential contracts use for progress payments — and, at each stage, what to check and what to record. We're not builders or lawyers; this is a practical homeowner's map. For staying organised across the whole build, see Staying Organised Through Your Build. For what happens when something goes wrong, see Building Defects in Australia.

The six stages at a glance

Most Australian home building contracts — HIA, Master Builders, and many custom forms — structure progress payments around the same physical sequence. Percentages vary; the stages don't.

*Illustrative payment shares only — your contract may differ. Deposit caps are set by state law, not this table: NSW allows up to 10% on contracts $20,000 and over (NSW contracts guide); several other states cap deposits at 5% for larger contracts. In NSW, progress payments must also be tied to defined stages of work, not arbitrary dates.

Building contracts explained →

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Stage 1 — Deposit and contract

What happens: You sign the building contract, pay the deposit, and the builder schedules the start date. Surveys, engineering, and council approvals may still be finalising. Colours and selections are often due soon — sometimes before slab.

What to check:

• The contract matches what you were quoted — inclusions, exclusions, allowances, provisional sums, and completion timeframe
• Deposit amount complies with your state's cap (where one applies)
• You understand the progress payment schedule and what triggers each stage
• Home building compensation insurance (or equivalent in your state) is in place before work starts on site, where required

What to record:

• Signed contract and all annexures (plans, specifications, selection schedules)
• Every email confirming inclusions, upgrades, or "included in the price" promises — especially anything discussed before signing
• Deposit receipt and insurance certificate details
• A personal copy of the plans and specs you'll reference for the next eighteen months

Why it matters: Disputes often turn on what was in the contract versus what was said in the sales meeting. If you only have one document, make it the written one — and keep everything that clarifies it. See Verbal agreements with your builder.

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Stage 2 — Base / slab

What happens: The site is cleared and levelled. Footings are dug, formwork goes in, steel is placed, and the concrete slab (or floor system) is poured. Underground plumbing for the slab may be installed before the pour.

What to check:

• Setout matches the approved plans — room dimensions, garage location, alfresco orientation
• Footing and slab details match engineering (you won't verify engineering yourself, but you can compare to plans)
• Plumbing penetrations and floor wastes are in the right locations before pour
• Surface falls on wet-area slabs (bathroom, laundry) drain the right way
• No obvious cracking or heaving after pour — note and photograph anything that concerns you

What to record:

• Dated photos of the formwork, steel, and plumbing before the pour — this is your last chance to see what's under the slab
• Photos of the finished slab with chalk lines or room labels if helpful
• Any variation or change requested at this stage, in writing, with price impact
• Builder's advice that base stage is complete (email) before you approve the progress payment

Why it matters: A wrong plumbing rough-in or a fall draining the wrong way becomes an expensive rectification once tiles and cabinetry are in. Common new-build defects often start here.

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Stage 3 — Frame

What happens: Wall frames go up, then the roof structure. You can walk through rooms for the first time. Windows and external doors may be installed during or after framing depending on the builder's sequence. This is also when the electrical and plumbing rough-in plan is usually finalised — fast.

What to check:

• Room sizes and openings match plans — measure if something feels wrong
• Window and door locations, sizes, and swing directions
• Structural members look plumb and aligned (obvious bows, gaps, or misaligned frames)
• Bracing and tie-downs visible before cladding covers them
• Roof frame pitch and overhangs match what you expected from elevations

What to record:

• Photos of every room from multiple angles — before insulation and plasterboard
• Marked-up electrical plan if you changed power points, switches, or data locations — confirm in writing with the builder
• Any on-site conversation about changes ("we'll move that window") emailed back same day
• Frame stage completion notice before paying the progress claim

Why it matters: Frame stage is the last time the skeleton is visible. Electrical changes after plasterboard are doable but costly. Verbal changes at frame stage are the classic "but you promised" scenario — see our guide on getting it in writing.

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Stage 4 — Lock-up

What happens: The building becomes weathertight. Roof cladding, external walls, fascias, gutters, external doors, and windows are in. The house looks like a house from the outside; inside it's still open framing, services, and bare floors.

What to check:

• Roof covering complete — no missing sheets or tiles, flashings at chimneys and penetrations
• External cladding installed with obvious gaps, damage, or misalignment noted
• Windows and external doors seal properly; open and close cleanly
• Gutters and downpipes in place with sensible falls (no obvious pooling)
• Weathertightness details at balconies and external junctions if applicable

What to record:

• External photos from all elevations
• Internal photos at lock-up — services (plumbing, electrical, HVAC) visible before linings
• Any visible defects: roof leaks after first rain, window leaks, cladding issues — photograph and email immediately
• Lock-up stage completion confirmation before payment

Why it matters: Lock-up is usually the largest progress payment. You're paying for a weathertight shell — if water gets in here, damage compounds through fixing stage. Don't rush the walkthrough because the builder needs the claim approved.

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Stage 5 — Fixing

What happens: Insulation, plasterboard, internal doors, architraves, skirting, cabinetry carcases, benchtops, tiling (after waterproofing), painting, and fixture installation. The house becomes recognisably your home. Trades overlap; the site is busy.

What to check:

• Waterproofing in wet areas before tiles are laid — membrane continuity, sealed penetrations, hob details, balcony falls
• Plasterboard finish quality (Level 4 vs 5 matters in raking light areas)
• Cabinetry and benchtop dimensions against plans
• Tile layout, grout lines, and alignment — easier to query before final clean
• Plumbing and electrical fit-off — test every tap, outlet, and switch as rooms are completed
• Heating, cooling, and ventilation grilles located where agreed

What to record:

• Waterproofing photos before tiling — non-negotiable
• Selection confirmations: tile choice, tapware, paint colours, benchtop edge profile
• Variations with signed or emailed approval and price
• A running snag and defect list — date every item; don't wait for handover
• Written notice for anything serious — see defect notice template

Why it matters: Fixing stage is where the most common defects get covered up. Waterproofing failures, in particular, are invisible and devastating once tiles are down. If you only inspect twice during the whole build, make one of them before bathroom tiles.

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Stage 6 — Practical completion and handover

What happens: Final paint touch-ups, appliance installation, site clean, and a pre-handover walkthrough. The builder asks you to sign a practical completion certificate. You receive keys — and ideally an occupation certificate from council (or confirmation it's been issued).

What to check:

• Every item on your running defect/snag list — in raking light, open every cupboard, run every tap, flush every toilet
• External completion: driveway, landscaping allowances, fencing if included
• All manuals, warranties, and compliance certificates collected (plumbing, electrical, waterproofing where provided)
• Occupation certificate (or certificate of occupancy) — understand whether the builder or you obtains it under your contract; don't assume
• Appliance registration and builder warranty documentation

What to record:

• Handover photos and video — room by room
• Signed snag list with agreed rectification dates — or written refusal to sign until major items are resolved
• Practical completion certificate only when you agree the stage is fairly complete — signing can affect warranty clocks and payment release
• Final progress payment receipt and retention/holdback if your contract includes one

Why it matters: Handover is not a formality. Builders often schedule a single rushed walkthrough. The owners who fare best arrive with a dated list built over months, not a panic scan on the day. How to document defects applies right up to the last hour.

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Inspections, certificates, and independent help

Your contract may require stage inspections or certificates at slab, frame, or waterproofing — especially if you're using a construction loan. Even without a bank requirement, an independent building inspector at frame and pre-handover is money well spent for most owner-occupiers.

What to ask for:

• Written inspection reports with photos
• Clear pass/fail on weathertightness and structural items
• Copy to your builder and your own records

Don't confuse a bank's progress inspector with a defect inspector — their job is often to confirm the stage is complete enough to release loan funds, not to find every fault.

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Progress payments — the golden rule

Pay for work completed, not time elapsed.

Red flags:

• Progress claim arrives before the stage looks finished on site
• Builder pressures you to sign because "everyone pays on the first of the month"
• You haven't visited the site since the last payment
• No written confirmation of stage completion

In NSW and several other states, contracts must tie payments to defined work stages — if yours doesn't, that's a conversation before you pay, not after. Your state contract guide has deposit and payment detail: Building contracts in Australia.

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One habit that changes everything

Each stage above has two lists: what to check and what to record. The checking protects quality. The recording protects you — your money, your timeline, and your position if the relationship sours.

You don't need to become a building expert. You need a dated timeline of photos, decisions, payments, and emails that grows as the build grows. That's the difference between handover feeling like a celebration and handover feeling like a tribunal evidence-gathering exercise.

Chronicle Build brings every email, text, photo, selection, and payment about your build into one clear timeline — staged against the milestones that actually matter. Hope you never need the dispute-ready bundle. Glad it's there if you do.

Join the Chronicle Build early access waitlist →

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Related guides

• Staying organised through your build
• Building contracts in Australia
• The most common new-build defects
• How to document a building defect
• Defect notice template

Frequently asked questions

What are the main stages of building a house in Australia?

Most Australian residential contracts follow six progress-payment stages: deposit (contract), base/slab, frame, lock-up, fixing, and practical completion. Names vary slightly by builder and state, but the sequence is broadly the same — foundations, structure, weathertight shell, internal fit-out, then handover.

When should I visit the site during a new home build?

At minimum: after slab pour (before it is covered), at frame completion (before cladding and linings hide the structure), at lock-up (roof and external envelope), before waterproofing is tiled over, and at pre-handover. These are the moments when problems are visible and cheap to fix.

Should I pay a progress payment before inspecting the stage?

No — or at least not without checking. Progress payments should align with completed work, not the calendar. Walk the site (or review photos and certificates), confirm the stage matches the claim, then pay. Paying ahead of completed work weakens your leverage if something is wrong.

What should I record at each build stage?

Dated photos (especially before cover-up), written confirmations of decisions and variations, progress payment claims and what they covered, inspection certificates where applicable, and any defects or concerns raised in writing. A running timeline beats reconstructing everything at handover.