NZ Building Code guide

🚿 Trades — the plain-English guide

Plumbing (G12/G13), drainage, electrical zones, gas (G11), smoke alarms — what other trades need from you. Free, plain-English NZ Building Code reference for builders — 6 topics.

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Plumbing (G12 hot water)NZBC clause G12 Water Supplies covers getting safe, adequate hot and cold water to the fixtures and away again. The…

Drainage (G13 foul water)NZBC clause G13 Foul Water covers carrying wastewater (from WCs, basins, showers, kitchen, laundry) safely to the…

Stormwater DrainageStormwater is rain off the roof and hard surfaces — a completely separate system from foul drainage. NZBC clause E1…

Electrical (AS/NZS 3000)Electrical work sits outside the Building Code — it's governed by the Electricity Act and the Electrical (Safety)…

Gas (G11)NZBC clause G11 Energy & Lighting / Gas (with the Gas Act and gas safety regs) covers LPG and natural-gas…

MEP Rough-in DimensionsStandard rough-in dimensions for residential MEP (mechanical/electrical/plumbing) services — the heights and setbacks…

More of the NZ Building Code guide: Standards & Codes · Contracts & Compliance · Quality & Defects · Build Sequence · Materials · Structural · Linings & GIB · Weathertightness · Fire & Acoustic · Energy & H1 · Site Conditions · Healthy Homes · Health & Safety · BRANZ Research · Pro Tips & Facts

Plain-English guide, not advice. This page helps you understand and navigate the rules — it is general information, not design, engineering or consent advice, and it does not reproduce the copyrighted tables of NZS 3604 or any Standard. Always check the current Standard or Acceptable Solution and your BCA, and use a suitably qualified LBP, engineer or QS where it matters.

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