A standard ceiling batt retrofit, supplied and installed, runs $20-$40 per m2 for most homes. Removing old insulation first is the biggest swing - this calculator prices R-value, removal and roof access properly, with a DIY materials mode too.
Choose your ceiling size and R-value. Stepping up an R-value costs little in labour - the material step is only about $3-$6 per m2 per level.
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Supplied + installed ceiling batt ranges for Australian homes, cross-checked across published guides and installer rate cards.
$20-$40 per m2
For most homes at R4.0-R5.0 with normal access and no removal. Published guide tables put an R4.0 install at $20-$33/m2; premium metro installers quote up to $30-$70/m2.
$30-$50 per m2
Old insulation removal starts from $15/m2 including disposal (indicative - single installer source). Full remove, vacuum and install-new packages are published at $30-$35/m2 + GST.
$8-$15 per m2
R3.5 glasswool batts supply at $8-$15/m2; installation labour adds $8-$20/m2 on top when a professional does it. A standard batt covers about 0.67 m2 - allow 10% waste.
$2,700-$5,250 for 150 m2
A published 150 m2 ceiling example at R3.5-class spec; a smaller 120 m2 lower-spec home runs $1,600-$3,000.
The biggest single swing on retrofit jobs - from about $15/m2 before the new batts even go in. Top-ups over sound existing insulation are the cheapest path.
Tight roof spaces and complex or multi-storey roofs cost more - published installer pricing jumps from $35-$70/m2 to $70-$110+/m2 for tight-access roof work.
Each R-step lifts material cost only about $3-$6/m2 and barely changes labour, so upgrading R-value while the installer is in the roof is good value.
Safety first: insulation must never cover non-IC-rated downlights or electrical fittings - it is a fire risk. That, plus state rules for work near electrical, is why complex ceilings belong to professionals.
The insulation guide covers climate-zone minimums under the National Construction Code, state rebate schemes and the safety warnings DIYers need.