A well-built deck extends your living space and adds value to your home. Here's what you need to know about building a deck in New Zealand.
Deck Costs in NZ
A basic pine deck costs $250-$400 per square metre. Hardwood (kwila, vitex) runs $400-$600/m². Composite decking costs $350-$550/m². A standard 20m² deck typically costs $8,000-$15,000 installed, depending on materials, height, complexity, and balustrade requirements.
Do You Need a Building Consent?
Decks under 1.5m above ground level are generally exempt from building consent (under Schedule 1 of the Building Act). However, decks attached to the house, higher than 1.5m, or over a certain size may require consent. Check with your local council or builder.
Choosing Deck Materials
H3.2 treated pine is the most affordable option and lasts 15-20 years with proper maintenance. Kwila and vitex are premium hardwoods that last 25+ years but require regular oiling. Composite decking (like Trex or Futurewood) is low-maintenance and lasts 25+ years but costs more upfront. Each has pros and cons for NZ conditions.
Design Considerations
Consider sun orientation (north-facing is ideal in NZ), shelter from prevailing winds, privacy from neighbours, access from indoor living areas, and drainage underneath. A good builder will help you design a deck that works with your section and lifestyle.
Maintenance
Timber decks need washing annually, re-staining or oiling every 1-2 years, and checking fixings and bearers for rot every few years. Composite decks only need occasional washing. NZ's UV exposure is harsh on all materials, so regular maintenance extends your deck's life significantly.
Finding a Deck Builder
Look for builders with specific deck-building experience and examples of completed projects. A deck might seem simple, but proper foundations, drainage, and structural connections are critical. Check reviews on Call A Tradie and get at least three quotes.