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NZ Building Code · Build SequenceWaste minimisation & disposal for NZ builders
Cutting site waste is both an environmental duty and a straight cost saving — separated streams are cheaper to dispose of than one mixed skip.
Construction and demolition waste is roughly 40–50% of everything going into NZ landfills, so it’s both an environmental issue and a real cost on your job — skip fees plus the materials you paid for going in the bin. A growing number of councils now ask for a Site Waste Minimisation Plan (SWMP) at consent, and the Waste Minimisation Act 2008 plus rising landfill levies make it only more relevant.
The waste hierarchy (top is best)
Work from the top down — the cheapest waste is the waste you never buy.
- Reduce — order accurately, set out to sheet and timber sizes, and cut off-cuts down. The cheapest waste is the waste you never buy.
- Reuse — deconstruct rather than demolish where you can; salvage timber, fixtures, bricks and joinery.
- Recycle — separate on site (see below).
- Dispose — only what’s left. Mixed-waste skips cost the most and recover the least.
Separating for recycling on site
Keep the streams apart so each can go to the right place:
- Clean timber — keep it separate.
- Metal — high value; worth sorting out.
- Plasterboard — GIB / Winstone take-back or dedicated recyclers; keep it dry and clean.
- Concrete and brick — cleanfill or crushing.
- Cardboard — separate for recycling.
Why it pays
Separated waste streams are cheaper to dispose of — or earn money, in the case of scrap metal — than one mixed skip, and a tidy, sorted site is safer and faster to work on.
Building a SWMP
If your council wants a Site Waste Minimisation Plan, build it straight from the hierarchy above:
- Estimate the main waste streams your job will produce.
- Name where each stream goes (recycler, take-back, cleanfill, disposal).
- Track it as the job runs.
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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Common questions
How much of NZ landfill is construction waste?
Construction and demolition waste is roughly 40–50% of everything going into NZ landfills, which makes it both an environmental issue and a real cost on your job through skip fees and wasted materials.
What is the waste hierarchy?
Top is best: Reduce (order accurately and cut off-cuts down), then Reuse (deconstruct and salvage timber, fixtures, bricks and joinery), then Recycle (separate streams on site), and finally Dispose — only what’s left. The cheapest waste is the waste you never buy.
How do I recycle plasterboard off-cuts?
Plasterboard goes to GIB / Winstone take-back or dedicated recyclers. Keep it dry and clean so it can be accepted.
What is a SWMP and how do I build one?
A Site Waste Minimisation Plan is what a growing number of councils ask for at consent. Build it from the waste hierarchy: estimate the main waste streams, name where each stream goes, and track it as the job runs.
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