Construction Stages Explained: The 5 Stages of Building a Home
The five stages of building a home — what happens at each stage, how long it takes and what to check.
Cost estimates only: Any building or upgrade figures in this guide are indicative, not fixed prices or quotes. Costs and inclusions vary by project, supplier, location and time. Confirm current written prices and specifications directly with your builder, suppliers and relevant trades.
- Australian home building follows five defined stages: slab, frame, lock-up, fixing and practical completion
- Each stage has a corresponding progress payment — you pay as each stage is completed
- You have the right to inspect each stage before making the progress payment
- Understanding what happens at each stage helps you catch issues early
- The total construction time is typically 6–14 months depending on home size and complexity
Building a new Australian home follows a defined process with five major construction stages. Each stage has a corresponding progress payment, and you have the right to inspect the work before paying. Understanding what happens at each stage, what to check and how long it takes helps you stay informed and catch issues early.
Stage 1: Base (Slab)
The base stage is when your home's foundation is created. The builder:
- Excavates and prepares the site (if not already done as site works)
- Lays the slab edge formwork and installs reinforcement (steel mesh)
- Installs plumbing and electrical conduits under the slab
- Pours the concrete slab
- Cures the slab (waits for the concrete to set and gain strength)
What to check: slab dimensions match the plans, slab is level, no cracking (hairline cracks are normal; structural cracks are not), drainage provisions are in the right place, plumbing rough-in is correct. This stage typically takes 1–2 weeks.
Stage 2: Frame
The frame stage is when the skeleton of your home is erected. The builder:
- Erects the wall frames (timber or steel)
- Erects the roof frame (trusses or rafters)
- Installs temporary bracing
- Installs window and door frames
- Frames are inspected (by the builder and potentially by a private inspector)
What to check: frame matches the plans (room sizes, openings, heights), frame is plumb and level, bracing is adequate, openings are the right size for windows and doors, frame height matches ceiling height. This stage typically takes 1–3 weeks. This is the most important stage to inspect — frame errors are expensive to fix later.
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Stage 3: Lock-Up
The lock-up stage is when the home can be locked — external walls, roof, windows and doors are installed. The builder:
- Installs external wall cladding (brick, render, cladding)
- Installs the roof (Colorbond or tiles, sarking, insulation)
- Installs windows and external doors
- Installs gutters and downpipes
- Wraps the home in building wrap (if applicable)
What to check: external cladding is installed correctly, roof is installed and flashings are in place, windows and doors are installed and sealed, gutters and downpipes are installed, no visible gaps or damage. This stage typically takes 2–4 weeks.
Stage 4: Fixing
The fixing stage is when the internal fitout is completed. The builder:
- Installs insulation (walls and ceiling)
- Installs plaster (walls and ceiling)
- Installs cornice and skirting
- Installs internal doors and architraves
- Installs cabinetry (kitchen, bathrooms, laundry)
- Lays flooring (tiles, timber, carpet)
- Installs tapware, vanities, toilets, baths, showers
- Installs appliances (oven, cooktop, rangehood)
- Installs light fittings and power points
- Paints walls, ceilings and trim
What to check: plaster is smooth and even, cornice and skirting are installed neatly, doors operate correctly, cabinetry is aligned and undamaged, tiles are laid correctly (no lipping, cracking), tapware and fittings are installed correctly, paint coverage is even. This stage typically takes 4–8 weeks — it's the longest stage.
Stage 5: Practical Completion
Practical completion is when the home is complete and ready for handover. The builder:
- Completes all remaining work
- Conducts a final clean
- Installs any remaining fixtures
- Conducts a practical completion inspection (PCI) with you
- Rectifies any defects identified at the PCI
What to check: EVERYTHING — this is your final inspection. Check all surfaces, fittings, fixtures, appliances, doors, windows, external areas. Document all defects. See our Practical Completion Guide for a comprehensive checklist. This stage typically takes 1–2 weeks.
| Stage | Duration |
|---|---|
| Base (slab) | 1–2 weeks |
| Frame | 1–3 weeks |
| Lock-up | 2–4 weeks |
| Fixing | 4–8 weeks |
| Practical completion | 1–2 weeks |
| Total (single-storey) | 6–9 months |
- What construction timeframe is specified in my contract?
- Can I inspect each stage before making the progress payment?
- What are the progress payment percentages for each stage?
- Does the contract include a liquidated damages clause for delays?
- Not inspecting each stage before making the progress payment — you lose leverage
- Assuming the build will take exactly the contracted time — delays are common
- Not understanding what happens at each stage — you can't check what you don't understand
- Making progress payments without verifying the stage is complete and defect-free
- Inspect each stage before paying — you have the right to verify work is complete and correct
- The frame stage is the most critical inspection — consider hiring a private inspector
- Track progress against the timeline and raise concerns early if the build is falling behind
- Understand the five stages — it helps you know what to check at each inspection
Frame Stage: What to Check
The most important stage to inspect — know what to look for.
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