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Made in NZ · For NZ buildersH1 R-values, checked both ways
Pick the district, enter each element’s area and construction R-value, and see whether the house meets H1 — by the 6th-edition calculation method, or the schedule method for consents lodged before 27 November 2026.
No credit card · Cancel anytime · Works offline on site · Flat NZD pricing
H1 compliance without the guesswork
H1/AS1 6th edition (in force 27 November 2025) removed the schedule method. The 5th-edition schedule method can still be used for building consents lodged before 27 November 2026; after that, the calculation method compares the house’s heat loss with a reference building of the same size.
Toolie’s H1 calculator runs both. The climate zone comes from the district (H1/AS1 Table C.1.1.2). You enter each element’s construction R-value — from the insulation maker’s tables or the BRANZ House Insulation Guide — and Toolie reads slab R-values from the MBIE slab tables by area-to-perimeter ratio and window R-values from the MBIE window table. You get the heat loss against the reference building, the minimum R-value backstops and the glazing limit, element by element.
- 6th-edition calculation method: heat loss against the reference building
- 5th-edition schedule method for consents lodged before 27 Nov 2026
- Climate zone by district (H1/AS1 Table C.1.1.2)
- MBIE slab tables by area-to-perimeter ratio, and the window table
- Minimum R-value backstops and the 40% glazing limit
- Pairs with the Healthy Homes check for rentals
It’s part of the quote, not a separate tool
In Toolie this isn’t a one-off calculator — it feeds the actual priced quote and the build programme. Describe the job or drop in a PDF plan and Toolie runs the take-off, applies NZ site intelligence and prices it off a real NZ pricebook.
More on-site calculators
See all 17 builder calculators, the full feature guide, or how Toolie quotes a job.
Common questions
Is the calculator the H1 6th edition?
Yes — it runs the H1/AS1 6th-edition calculation method (Equation 2.1 against the reference building in Table 2.1.2.7), and keeps the 5th-edition schedule method for building consents lodged before 27 November 2026.
How does Toolie pick the climate zone?
You choose the district and Toolie applies H1/AS1 Table C.1.1.2, which sets the zone for each territorial authority.
Does the H1 check write into my quote?
No — it is a stand-alone check. Enter the construction R-values you are quoting to confirm they pass before the quote goes out.
Quote, comply and get paid — in one place
Start free today. Built around NZS 3604, H1, Healthy Homes & CCA 2002. One flat price for your whole crew.
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