Healthy Homes Compliance Cost Calculator
Estimate the cost to make a NZ rental property comply with the Healthy Homes Standards. Covers heating, insulation, ventilation, moisture, and drainage.
About this calculator
This calculator implements Healthy Homes Standards (heating, insulation, ventilation, moisture, drainage) from Tenancy Services NZ. Last consulted 18 May 2026. Verify the figures yourself by following the link.
NZ Healthy Homes Standards (5 areas)
All private rentals (compliance deadline 1 July 2025)- •Heating standard: Fixed heater, sized to living room
- •Ceiling insulation R-value: R2.9 (zone 1-2) / R3.3 (zone 3)
- •Underfloor insulation R-value: R1.3+
- •Ventilation: Extractor fans in kitchen + bath
- •Moisture barrier (if floor enclosed): Polythene under floor
- •Max penalty per breach: $7,200 (Tenancy Tribunal)
Source: Tenancy Services NZ
Disclaimer
This calculator provides estimates for general information purposes only. Results should not be relied upon as professional financial, tax, or legal advice. Tax rates and thresholds are based on publicly available IRD data and may change. Always consult a qualified tax agent or financial adviser for advice specific to your circumstances.
How Healthy Homes compliance cost is estimated
Sum of unmet standards' remediation costs, each with $/m² or $/unit benchmarks.
- 1
Heat pump cost
Heating = $2,500 + ceil(kW_needed) × $500
kW = max(1.5, living_area ÷ 50 × 1.5).
- 2
Ceiling insulation
Ceiling = floor_m² × $25/m² (full top-up)
Partial top-up ~$15/m² if existing R2.9+.
- 3
Underfloor insulation
Underfloor = floor_m² × $20/m²
Often less practical in older homes with no access.
- 4
Misc (ventilation, moisture)
Extras = 2 × $350 (fans) + floor_m² × $15 (moisture barrier)
Plus drainage if needed.
- 5
Total compliance cost
Total = sum of non-compliant items
Penalty for non-compliance up to $7,200 per breach.
Worked example
Inputs: 120m² 1980s rental, no heat pump, no insulation, basic ventilation
Result: Heating $4k + ceiling $3k + underfloor $2.4k + fans $0.7k + moisture $1.8k = ~$11.9k.
Frequently Asked Questions
What are the NZ Healthy Homes Standards?
How much does it typically cost to comply?
The Healthy Homes compliance cost calculator estimates what it will cost to bring a NZ rental property up to the Healthy Homes Standards across all five areas: heating, insulation, ventilation, moisture ingress, and drainage/draught stopping.
How this calculator works
All private rentals must have complied with the Healthy Homes Standards since 1 July 2025, and each breach can cost a landlord up to $7,200 at the Tenancy Tribunal. The calculator prices each unmet standard using NZ trade benchmarks. Heating is a fixed heater sized to the main living area — a heat pump typically costs $2,500 plus about $500 per kW of required capacity (roughly 1.5 kW per 50 m² of living space). Ceiling insulation must reach R2.9 (climate zones 1-2) or R3.3 (zone 3), costing about $25/m² for a full top-up; underfloor insulation to R1.3 runs about $20/m². Ventilation requires extractor fans in the kitchen and bathroom (~$350 each installed), and enclosed subfloors need a polythene moisture barrier at roughly $15/m². Summing only the items your property is missing gives a realistic compliance budget.
Healthy Homes Standards — the five areas
| Heating | Fixed heater sized to the main living area |
| Ceiling insulation | R2.9 (zones 1-2) / R3.3 (zone 3) |
| Underfloor insulation | R1.3 or better |
| Ventilation | Extractor fans in kitchen and bathroom |
| Moisture barrier | Polythene ground cover if subfloor is enclosed |
| Compliance deadline (all private rentals) | 1 July 2025 — already in force |
| Maximum penalty per breach | $7,200 |
Cost benchmarks are indicative national trade rates; get local quotes.
Worked Examples
120 m² 1980s rental: no fixed heating, no insulation, no extractor fans, enclosed subfloor
Total compliance cost ≈ $11,900.
- Heat pump for the living area: ≈ $4,000
- Ceiling insulation: 120 m² × $25 = $3,000
- Underfloor insulation: 120 m² × $20 = $2,400
- Extractor fans: 2 × $350 = $700
- Moisture barrier: 120 m² × $15 = $1,800
- Total: ≈ $11,900
90 m² 2000s rental: heat pump already fitted, partial ceiling insulation, no extractor fans
Total compliance cost ≈ $2,050.
- Heating: already compliant — $0
- Ceiling insulation top-up: 90 m² × $15 = $1,350
- Extractor fans: 2 × $350 = $700
- Total: ≈ $2,050
Built and maintained by Konstantin Iakovlev. Data sourced from the IRD and official New Zealand government sources.
Last reviewed: