H1 Compliance Checker

01 / Project Details

Climate Zone

Building Type

Construction Type

Floor Area (m²)

Zone lookup: use Zone Finder to confirm your H1 climate zone from an address.

02 / Assembly R-Values

Enter the calculated construction R-value for each element. Use the R-Value & Dewpoint tool to calculate these. Leave blank if the element does not apply.

Roof/Ceiling R

Wall R

Floor R

Window R

Required Minimums (auto-updated from zone + construction type)

R —

03 / Glazing Specification

Glazing Type

Frame Type

Glazing Area (m²)

Total Wall Area (m²)

% of Wall Area

—

Max Allowed

30%

04 / Compliance Summary

Enter values and run check

Element	Provided R	Required R	Margin	Result

Schedule method scope. This check applies H1/AS1 5th Edition Amendment 1 schedule method for housing and small buildings ≤300 m². Buildings >300 m² require H1/AS2 or H1/VM2. The schedule method requires glazing ≤30% of total wall area; for 30–40% glazing use the calculation method (H1/AS1 2.1.3); beyond 40% use H1/VM1. This tool does not account for thermal mass credits, heated elements, or trade-offs. Results are indicative — verify against the current NZBC amendment in force for your consent with a qualified professional.

H1/AS1 Minimum R-Values — Reference

H1/AS1 5th Ed Amdt 1 · Table 2.1.2.2B · Schedule / Calculation method

Zone	Roof	Wall (T)	Wall (S)	Wall (M)	Floor	Win (Al)	Win (TB/Ti)
1	6.6	1.9	1.9	1.9	1.3	0.26	0.26
2	6.6	1.9	1.9	1.9	1.3	0.26	0.26
3	6.6	1.9	1.9	1.9	1.3	0.26	0.26
4	6.6	1.9	2.0	2.0	1.3	0.26	0.26
5	6.6	2.0	2.0	2.0	1.3	0.30	0.30
6	6.6	2.0	2.0	2.0	1.3	0.30	0.30

T=Timber, S=Steel, M=Masonry. Win(Al) = min Rw for standard aluminium frame. Win(TB/Ti) = min Rw for thermally broken aluminium or timber/uPVC frame. Large buildings use H1/AS2.

Window R_w Requirements by Type — H1/AS1 Table E.1.1.1

Minimum construction R-value (R_w) for windows by glazing specification and climate zone. Aluminium frames in zones 1–4 require R0.26. Zones 5–6 require R0.30 (TB/timber) or R0.30 (aluminium). Use a Statement of Thermal Performance from your joinery supplier for the actual R_w value.

Glazing	Ug	Al (Z1–4)	Al (Z5–6)	TB Al (Z1–4)	TB Al (Z5–6)	Tim/PVC (Z1–4)	Tim/PVC (Z5–6)
Single	5.8	0.26	0.30	0.26	0.30	0.26	0.30
Dbl + Air spacer	2.9	0.26	0.30	0.32	0.42	0.32	0.42
Dbl + Warm edge	2.9	0.26	0.30	0.40	0.50	0.40	0.50
Dbl + Low-E₃	1.3	0.35	0.37	0.46	0.63	0.46	0.63
Dbl + Low-E₄	1.1	0.37	0.50	0.50	0.69	0.50	0.69
Triple	0.7	0.50	0.50	0.50	0.77	0.50	0.77

Source: H1/AS1 5th Ed Amdt 1 Table E.1.1.1. TB = thermally broken. Tim/PVC = timber or uPVC frame. The required R_w depends on the glazing/frame combination AND the climate zone — read the row that matches your spec. The schedule-method floor (R0.26 / R0.30) is the absolute minimum the assembly must achieve in any zone.