Heat rises. In a NZ home with no ceiling insulation, you can lose 30–35% of the heat you've paid to generate straight out the roof. That's why ceiling first, always.
The priority order
- Ceiling — biggest single win. R3.6 Pink Batts or equivalent. Often eligible for the Warmer Kiwi Homes 90% co-funded grant.
- Underfloor — second biggest. Cold floors = cold rooms. R1.4–R2.0 polyester underlay or pumped foam.
- Pipe and cylinder lagging — costs $50, saves hundreds.
- Wall insulation — only worth it during a renovation when the linings are off.
- Glazing — last on the list. Hugely expensive vs the saving. Curtains and pelmets first.
Free money — Warmer Kiwi Homes
If your home was built before 2008 and you own it, the government covers 90% of the cost of ceiling and underfloor insulation. Heat pump installation is also covered up to $3,450. Always check your eligibility before paying for either.
Get a personalised priority list from our free home audit.