Changes to Building Code clause H1 (Energy efficiency), introduced from late 2021 with transition periods into 2023, raised minimum thermal performance for new buildings. For estimators, that is not just a product change: it can change quantities and labour too.
Six climate zones
The updated acceptable solutions divide New Zealand into six climate zones instead of three. A home in Southland or Central Otago now has noticeably higher minimum requirements than one in Northland. Using an old default R-value from a previous job can understate costs.
Where it shows up in an estimate
Insulation lines change product and thickness. Walls may need deeper framing to fit higher-R products. Glazing specifications often move to low-E double glazing or thermally broken frames. Slab edge and under-slab insulation are more common.
The safest approach is to measure what is specified on the consented drawings, rather than assume minimums, and to flag any part of the specification that is unclear.
Our approach
We read the insulation and glazing specification for every job and measure the specified products. We do not certify H1 compliance; that sits with the designer and building consent authority.