How much does it cost to build a deck in NZ in 2026?
Short answer
A standard treated-pine deck in 2026 runs $300-500 per m² for a simple ground-level deck, $500-800/m² for a raised deck with handrails, and $800-1,500+/m² for hardwood (kwila, vitex) or composite decking. A 25 m² deck typically lands $8-20k installed. Hardwood and composite cost more upfront but last longer with less maintenance.
Key facts
- Treated pine, ground-level: $300-500/m²
- Treated pine, raised with handrails: $500-800/m²
- Hardwood (kwila / vitex): $800-1,300/m²
- Composite decking (Trex, Modwood): $1,000-1,500+/m²
- Decks under 1.5m generally don't need consent
Material choice — long-term cost
Treated pine: cheapest upfront, needs oiling/staining every 1-2 years, lifespan 12-15 years without major work.
Hardwood: higher upfront, oil every 2-3 years, lifespan 25+ years.
Composite: highest upfront, almost no maintenance, lifespan 25+ years, doesn't splinter or grey.
Cost over 20 years tends to favour hardwood or composite even though upfront is higher.
What's in the per-m² price
Decking boards, joists, posts, fixings, labour. Usually excludes: foundation work for raised decks, balustrades for raised decks (~$200-400/m), stairs, footings.
Always get the quote with what's included spelled out.
Knowing the rules is half the job. The other half is knowing who you're hiring — check any NZ builder's court action, insolvency history, director track record and AI risk score in minutes.
Related questions
Sources: Master Joiners pricing; Carter Holt Harvey / ITM merchant pricing 2026. General information for NZ homeowners, not legal advice — building rules change and vary by council, so confirm critical details on the official source before acting. Last updated 2026-05.