H1 Calculations: Building Code Compliance Made Simple
Understanding H1 compliance doesn't need to be complicated. Whether you're building a new home, renovating, or designing a commercial space, we'll help you navigate the three pathways to meet New Zealand's energy efficiency requirements.
What is H1 Compliance?
New Zealand Building Code Clause H1 sets minimum requirements for energy efficiency in buildings. It ensures your building envelope (walls, roof, floors, windows) provides adequate thermal resistance to keep occupants comfortable while minimizing energy costs.
Three Ways to Show H1 Compliance
1. Schedule Method
The simplest approach—use the prescriptive R-values from the Building Code tables (H1/AS1 or H1/AS2). Perfect for straightforward residential projects with standard construction.
Best for:
• Standard residential builds
• Projects using conventional construction methods
• Builders who want certainty without calculations
2. Calculation Method
Compare your proposed building's heat loss against a reference building insulated to minimum standards. This method gives you flexibility to trade off between different building elements.
Best for:
• Custom designs with non-standard construction
• Projects where you want to use lower R-values in one area but compensate elsewhere
• Designs with large glazing areas
Our calculator implements Section 2.1.3 of H1/AS1 and H1/AS2, allowing you to:
• Input your specific building envelope details
• Compare against reference building performance
• Generate a compliance report
• Understand where heat loss is occurring
3. Verification Method (Energy Modelling)
The most flexible pathway—use whole-building energy modeling (H1/VM1) to demonstrate your design meets or exceeds energy performance requirements. This method considers the entire building system, not just the envelope.
Best for:
• Complex commercial buildings
• Passive House projects
• High-performance homes with advanced HVAC systems
• Buildings with significant passive solar design
• Bank-ready energy performance reports
Get expert H1/VM1 verification [link]
Our comprehensive energy modeling service includes:
• Detailed thermal modeling using industry-standard software
• H1/VM1 compliance verification
• Bank-ready energy performance certificates
• Design optimization recommendations
• Building warrant of fitness support
Need Help?
Not sure which compliance pathway is right for your project? Our building science experts can guide you through the options and ensure your design meets all requirements.
Contact us: denise@beoscience.com | 0210 239 4980