Insulation Costs
Average costs per m² (supply and install):
- Ceiling batts (R4.0): $12-20/m²
- Ceiling batts (R6.0): $18-28/m²
- Wall batts (R2.5): $10-18/m²
- Underfloor: $15-30/m²
- Spray foam: $30-60/m²
Full House Costs
- Ceiling only (150m²): $2,000-4,000
- Walls (new build): $2,000-5,000
- Complete package: $4,000-10,000
R-Value Requirements (by climate zone)
- Hot/humid: R4.0 ceiling, R2.0 walls
- Warm: R4.0-5.0 ceiling, R2.5 walls
- Mild: R5.0 ceiling, R2.5 walls
- Cool: R6.0 ceiling, R2.5-4.0 walls
- Cold: R6.0-7.0 ceiling, R4.0 walls
Insulation Types
- Glasswool batts: Most common, cost-effective
- Polyester batts: Non-irritant, slightly more expensive
- Cellulose: Blown in, good for retrofits
- Spray foam: Best seal, highest cost
- Reflective foil: Good for radiant heat