Pre-lining inspection

A pre-lining inspection is the walk-through after first fix is complete and before linings (plasterboard, fibre cement, panel) go up. The builder, certifier, and the key trades (sparky, plumber, HVAC, hydronics, data, fire) walk every room and confirm that what’s in the walls matches what’s on the drawings. Once linings go on, anything missed is a tear-out and re-do at significant cost.

What gets checked at pre-lining:

Electrical: every outlet, switch, ceiling-fan rough-in, downlight cut, smoke alarm box, data point, oven and cooktop circuit positions. The sparky shows the certifier the cable runs into each location.
Plumbing: hot/cold tail positions for every tap, mixer, and appliance; waste pipe alignments; gas line endpoints; pressure-test results on hot and cold lines.
HVAC and ducted services: return-air grille locations, supply-air diffuser positions, controller wiring rough-ins, refrigerant line stubs at the wall.
Fire detection and alarm: cable runs, hard-wired smoke alarm locations, interconnect wiring (required on residential), emergency lighting (Class 2 plus).
Acoustic and fire-rated walls: confirm correct grade plasterboard ordered for those zones; confirm acoustic batts installed in the right cavities; confirm penetrations through fire-rated walls have correct fire collars or seals.
Noggings and blocking: timber blocking where heavy fittings will be screwed later (TV mounts, wall ovens, towel rails, shelving brackets, balustrade fixings).
Insulation: wall and ceiling insulation in place to the spec’d R-value, no gaps at top plate or behind switches.
Vapour barriers and sarking: sarking continuous over framing, taped at joins where rated for that role.

Why it matters. Linings hide everything behind them. Common defects discovered after lining and paint, with the tear-out cost:

Missing or wrong-location cable: $500 to $2,000 per location.
Plumbing tail at wrong height: $300 to $1,500 per fixture.
Missing nogging behind a TV bracket: $200 to $800 plus repaint.
Wrong-grade plasterboard on a fire-rated wall: $2,000 to $10,000 for the wall.
Missing return-air path: HVAC underperforms permanently or major re-do.

A 60-90 minute pre-lining walk costs almost nothing relative to any one of these.

Who runs it. The builder organises and leads. The RBS / certifier attends in most jurisdictions (mandatory inspection in VIC; varies elsewhere). The trades attend to defend their first fix or capture rework. The client is welcome but optional.

Documentation. Photograph every wall before the plasterboard goes on. A drone or 360-camera through the empty framed shell produces a permanent record that pays off years later when someone wants to know where a cable runs.

For builders.

Schedule the walk at the end of the first-fix lock-down day, before the linings supplier arrives. Don’t do it the morning of lining-fix day; there’s no time to remediate.
Use a printed checklist matched to the architectural and services drawings. Tick off each item room by room.
Don’t skip rooms. Bathroom corners, laundry behind appliances, and walk-in robe back walls are the most-missed.

Also known as: pre-line walk-through, first-fix sign-off, rough-in inspection.

Category: Practical / inspection / first-fix.

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