Welcome to your go-to guide for choosing the right decking timber in NZ. Whether you’re planning a weekend DIY project or a full outdoor renovation, picking the right timber can make or break the look, feel, and durability of your deck. With New Zealand’s changing weather and love for outdoor living, it’s important to understand which timber suits your space, budget, and maintenance preferences. In this post, you’ll learn about the most popular decking timber options, how to compare them, what to look for when buying, and how to avoid costly mistakes, so you can build a deck that lasts and looks great year-round.
The best decking timber in NZ includes pine for affordability, kwila for rich colour and durability, vitex as a sustainable option, and garapa for low maintenance. Choose based on climate, budget, and desired look. Always check for treatment grades like H3.2 or H4 to ensure outdoor durability.
Table of Contents
What Is Decking Timber?
Decking timber is a type of wood specifically designed and treated for outdoor use, particularly for building decks, patios, or other exposed structures. It’s built to withstand the elements, sun, rain, moisture, and foot traffic, making it more durable than untreated or indoor-use timber. In New Zealand, decking timber is a common choice for creating practical and attractive outdoor living areas, especially with the country’s love for backyard entertaining and open-air spaces.
Unlike standard timber used for interior framing or furniture, decking timber must meet specific requirements to handle outdoor conditions. Standard timber is often untreated or lightly treated and not suitable for prolonged exposure to moisture, which can cause warping, rotting, or fungal growth. Decking timber, on the other hand, is either naturally resistant to decay (like hardwoods) or pressure-treated with chemicals to protect it from insects, mold, and rot.
Treatment and durability are key when choosing the right timber for decking in NZ. Treated pine, for example, is widely available and affordable. It’s commonly treated to H3.2 grade, which means it’s suitable for use above ground and in contact with the weather. For parts of the deck that touch the ground, like posts or bearers, you’ll typically need H4-treated timber, which offers stronger protection against decay. These treatment ratings are based on New Zealand standards and help ensure safety and longevity in the country’s varied climates.
Using the right timber for decking in NZ means your deck will last longer, stay safer, and look better over time. Always check for durability ratings, treatment grades, and supplier reputation when choosing your materials. This ensures that your outdoor space not only looks good but also stands the test of time.
Common Types Of Decking Timber In NZ
Choosing the right decking timber is one of the most important decisions you’ll make when building or upgrading your outdoor space. New Zealand’s climate, budget range, and aesthetic preferences all play a role in your decision. Below, you’ll find the most commonly used decking timbers in NZ, each with its own strengths and trade-offs. This guide breaks them down to help you make an informed choice.
Pine
Pine is one of the most popular decking timber options in NZ, especially for those on a budget. It’s widely available, easy to work with, and suitable for a range of outdoor projects.
- Treated Options:
Pine used for decking is typically treated to withstand outdoor conditions. The most common treatments are H3.2 (for above-ground use) and H4 (for in-ground contact). These treatments protect the timber from fungal decay and insect damage.
Pros:
- Affordable and cost-effective
- Readily available across NZ
- Easy to cut, drill, and install
- Can be stained or painted to suit any style
Cons:
- Requires regular maintenance (oiling or staining)
- More prone to warping or splitting if not sealed properly
- Shorter lifespan compared to hardwoods
Pine is ideal for budget-conscious homeowners or DIYers who are prepared to maintain their decks regularly.
Kwila
Kwila is a dense, imported hardwood known for its strength and rich reddish-brown colour. It’s a premium choice for those wanting a durable and eye-catching deck.
- Rich Colour And Durability:
Kwila’s deep colour gives a luxurious feel. Over time, it weathers to a silver-grey if left untreated. It’s resistant to rot, fungi, and insects, making it suitable for NZ’s variable weather conditions. - Environmental Concerns:
There are sustainability concerns with Kwila due to illegal logging in some regions. When buying, look for FSC-certified Kwila to ensure it’s sourced from responsibly managed forests.
Pros:
- Extremely durable and long-lasting
- Attractive colour and grain
- Performs well in harsh conditions
Cons:
- Higher cost
- Can bleed tannins that stain nearby surfaces
- Heavy and harder to work with
If you want a premium hardwood deck that will last for decades, Kwila is one of the best hardwood decking timber NZ options.
Vitex
Vitex is a sustainable hardwood that has become a popular alternative to Kwila. It’s lighter in colour and easier to handle, while still offering strong performance outdoors.
- Light Appearance:
Vitex has a pale yellow to creamy-white tone, which gives a modern, clean look. It weathers gracefully and suits minimalist or coastal-style homes. - Naturally Durable:
Vitex is naturally resistant to decay and insect attack, even without treatment. It’s typically sourced from the Solomon Islands and often comes from certified, legal sources.
Pros:
- Sustainably harvested in most cases
- Lighter and easier to install than Kwila
- Doesn’t bleed or stain like other hardwoods
Cons:
- Less available than pine or Kwila
- Slightly higher price point than pine
For those looking for eco-friendly decking timber NZ residents trust, Vitex is a strong and responsible option.
Garapa
Garapa is another hardwood that’s gaining popularity in NZ. It offers a golden-yellow colour, great durability, and low maintenance, making it ideal for busy homeowners.
- Low-Maintenance:
Garapa resists scratches, dents, and weathering. It also doesn’t require as much ongoing treatment as softer timbers. - Doesn’t Bleed Like Kwila:
A big advantage of Garapa is that it doesn’t release tannins, so it won’t stain surrounding surfaces like tiles or concrete. - Medium Tone:
Garapa starts with a warm, honey tone and weathers to a soft silver-grey. It fits well with a wide range of home styles.
Pros:
- Hard, dense, and long-lasting
- Low risk of staining
- Smooth and clean finish
Cons:
- More expensive than pine
- Can be harder to source in some areas
Garapa is a smart pick if you want a low-maintenance deck with high durability and a clean aesthetic.
Other Options
Besides the common timbers mentioned above, here are a few more choices that may suit your specific needs:
- Jarrah:
An Australian hardwood known for deep red tones and toughness. Best for high-end builds. - Purpleheart:
Striking purple colour that fades to brown-grey. Extremely hard and dense. - Composite Timber:
Made from wood fibres and plastic. Very low maintenance and resistant to rot, but can get hot underfoot.
When To Choose These Options:
- Use Jarrah or Purpleheart if you want something unique and durable.
- Choose composite timber if you want a long-term, no-maintenance solution.
- Look into these alternatives when aesthetic or specific performance needs override cost concerns.
Choosing the right decking timber in NZ depends on your priorities, cost, maintenance, durability, sustainability, and appearance. Whether you go for the affordability of pine or the prestige of Kwila, understanding each type helps you build a deck that fits your home and lifestyle.
Factors To Consider When Choosing Decking Timber
Choosing the right decking timber isn’t just about picking the nicest-looking wood. You need to match the timber to your lifestyle, budget, environment, and expectations. Below are key factors you should think through before making a decision.
Climate: Coastal Vs. Inland, Sun Exposure
New Zealand’s climate varies a lot from region to region. If you live near the coast, your deck will face high moisture, salt air, and humidity. In this case, choose a timber that resists rot and decay, like kwila, garapa, or well-treated pine.
Inland areas, especially those with hot summers, can dry out timber quickly. Some woods crack or split under intense sun. If your deck gets a lot of direct sunlight, pick a stable timber that won’t expand or contract too much.
Also, think about shaded areas. Damp, shaded decks need timber with good mold resistance. Always match your timber to your microclimate.
Budget: Upfront Cost Vs. Long-Term Value
Decking timber ranges in price. Treated pine is affordable upfront but may require more maintenance down the road. Hardwood timbers like kwila or vitex cost more, but they tend to last longer and need less frequent upkeep.
Ask yourself:
Do you want to save money now or spend less over the next 20 years?
Are you building a forever home or upgrading to sell?
Don’t just look at price per metre. Factor in tools, stains, oil, and long-term durability.
Maintenance Level: Some Woods Need Oiling, Some Don’t
Some decking timbers require regular oiling or staining to keep their colour and protect against the elements. For example, kwila and vitex benefit from oiling to maintain their rich tones and surface protection.
Pine also benefits from sealing, but it’s more forgiving if left untreated. Garapa weathers to a soft silver-grey and stays visually appealing even without much maintenance.
If you’re not keen on annual deck maintenance, choose a low-maintenance timber and accept the natural ageing look. Ask yourself:
Is low maintenance more important than looks?
Aesthetics: Colour, Grain, And How It Weathers
Each timber has a unique look. Kwila is dark and rich. Vitex is pale and smooth. Garapa has a golden honey tone. Pine is light and can be stained to match almost anything.
But over time, all timbers weather when exposed to sunlight and rain. Most will turn grey or silver unless oiled regularly. This natural process doesn’t affect the wood’s performance, but it changes how it looks.
Think about your long-term vision:
Do you want a deck that stays light, or one that turns silver over time?
Also, consider the wood grain and whether you want a bold, natural texture or a clean, minimal finish.
Environmental Impact: Sourcing, Certifications, Local Vs. Imported
Sustainability matters. Many NZ homeowners are now choosing eco-friendly timber options. Look for timber certified by FSC (Forest Stewardship Council) or PEFC (Programme for the Endorsement of Forest Certification).
Locally sourced pine is a sustainable choice that supports NZ forestry and cuts down on shipping emissions. Imported hardwoods should come from responsibly managed forests.
Always ask where the timber comes from. Avoid woods harvested from endangered forests or unsustainable sources.
When you weigh up all these factors, you’ll find the right timber for your home, and avoid costly regrets later. Every deck is different. What works for a beach house might not suit a mountain cabin or a rental property. Make your choice based on how you live, not just how it looks.
Timber Treatment And Durability Ratings In NZ
When choosing decking timber in NZ, one of the most important things to understand is timber treatment and its durability rating. These factors determine how well the wood holds up in New Zealand’s climate, how long it lasts outdoors, and whether it meets local building regulations. If you’re planning to build a deck that’s safe, long-lasting, and compliant, knowing the difference between H3.2 and H4 timber is essential.
What Do H3.2 And H4 Mean?
In New Zealand, treated timber is graded based on its hazard class , a system that shows what conditions the wood is suitable for. You’ll often see labels like H1.2, H3.2, or H4 on timber products. For decking timber, the two most relevant grades are:
- H3.2: This is suitable for above-ground, exposed timber, like decking boards. It’s treated to resist moisture, fungal decay, and insect attack, making it ideal for outdoor structures that don’t sit directly on the ground.
- H4: This is used for timber that comes into contact with the ground, such as deck posts, retaining walls, and fence rails. It offers a higher level of protection against rot and insect damage.
Choosing the right treatment level ensures your deck doesn’t degrade prematurely. Using untreated or under-treated timber in the wrong setting can lead to fast deterioration, costly repairs, or safety issues.
Why Timber Treatment Matters
New Zealand’s environment is harsh on outdoor wood. Between heavy rain, humidity, and temperature swings, untreated timber can quickly become a breeding ground for mold, fungi, and wood-boring insects like borers or termites.
Using decking timber treatment NZ-approved products helps protect your investment. Proper treatment:
- Prevents rot and fungal decay
- Protects against insect infestations
- Extends the life of your deck by 10–30 years, depending on the wood
- Meets NZ Building Code requirements
Make sure the treatment is pressure-applied and that you follow any post-installation care, like sealing cut ends with an approved treatment product.
Safety And Compliance For Elevated Decks Or Pool Areas
If your deck is elevated over 1.5 metres or located near a pool, building consent is usually required. In these situations, H4 or higher-rated timber may be necessary for structural elements like posts or bearers to ensure they meet safety standards.
Non-compliance can lead to penalties or having to rebuild parts of the structure. For example, building near a pool requires non-toxic treatment to avoid chemical leaching into water systems. In some cases, H5-treated timber is recommended for in-ground or very wet environments.
Always refer to the New Zealand Building Code and timber treatment guidelines to check what’s allowed in your region. You can find more information on the NZ Building Performance website.
If you’re unsure what treatment level you need, ask your timber supplier. Provide details about the deck’s height, location, and exposure to moisture. They can help match you with the correct decking timber treatment NZ standards, so your deck is not only beautiful but built to last.
Cost Comparison: Understanding Decking Timber Prices In NZ
Choosing the right decking timber isn’t just about appearance, it’s also about cost, value, and how much maintenance you’re willing to take on. In New Zealand, timber prices vary depending on the type of wood, its treatment level, and other key factors. Whether you’re working on a tight budget or investing in a premium hardwood deck, it’s important to understand what you’re really paying for and what kind of performance to expect over time.
General Price Ranges Per Square Metre
Here’s a rough guide to what you can expect to pay per square metre for common decking timbers in NZ:
- Treated Pine: $30–$60 per m²
- Kwila: $90–$140 per m²
- Vitex: $80–$120 per m²
- Garapa: $85–$130 per m²
- Composite Timber (for comparison): $110–$150 per m²
Keep in mind that these prices are ballpark figures. They may vary depending on your location, supplier, and whether the timber is pre-oiled or kiln-dried.
What Factors Add To The Total Cost?
Several hidden costs can affect your total project budget:
- Length and Width of Boards: Wider and longer boards often cost more per piece.
- Treatment Grade: Higher treatment levels (like H4) add to cost but increase longevity.
- Timber Grade: Premium grades with fewer knots and better visual appeal cost more.
- Transport or Delivery: Heavy timber deliveries can add a significant fee, especially in rural areas.
- Installation Costs: If you’re hiring a builder, timber type affects labor (e.g., hardwoods take longer to cut and fix).
These are all important to factor in when comparing timber options, not just the cost per metre.
The Value Over Time
A lower price upfront doesn’t always mean lower total cost. Treated pine may cost less to buy, but it usually needs more frequent maintenance, staining, or replacement within 10–15 years. In contrast, hardwoods like Kwila or Vitex may have a higher initial cost but require less upkeep and can last 25 years or more.
If you plan to stay in your home long-term or want fewer maintenance headaches, investing in a more durable timber might save you money over time.
Comparison Table: Price, Lifespan, And Maintenance
| Timber Type | Avg. Price per m² | Lifespan (Years) | Maintenance Level |
| Treated Pine | $30–$60 | 10–15 | High |
| Kwila | $90–$140 | 25–30 | Medium |
| Vitex | $80–$120 | 25–30 | Medium |
| Garapa | $85–$130 | 20–30 | Low |
| Composite Timber | $110–$150 | 25–35 | Very Low |
Use this table to compare not just price but also the long-term value of each material. Sometimes spending a little more now means fewer costs later, and fewer weekends spent sanding and oiling your deck.
Where To Buy Decking Timber In NZ
When it comes to building a deck that lasts, choosing the right supplier is just as important as choosing the right timber. In New Zealand, you’re spoiled for choice with several reliable places to buy decking timber, whether you’re planning a weekend DIY project or hiring a builder to do the job.
Trusted Suppliers Across New Zealand
Some of the most popular suppliers include:
- Mitre 10 – Offers a wide selection of treated pine and hardwood decking boards, available in various sizes and finishes. Most stores have knowledgeable staff who can guide you on what suits your needs.
- Bunnings Warehouse – Known for competitive pricing and bulk deals. Bunnings also stocks composite decking and provides delivery options nationwide.
- ITM (Independent Timber Merchants) – Ideal for custom orders and bulk supply. ITM is locally owned, and each branch may carry a unique range tailored to local preferences and climate conditions.
- Local Timber Yards – Don’t overlook small or independent timber yards. They often carry high-quality timber sourced from New Zealand mills and may offer better customer service and advice for your specific region.
Buying locally helps support Kiwi-owned businesses and reduces the environmental impact of long-distance shipping.
What To Look For Before You Buy
Before purchasing, take time to inspect the decking timber, especially if you’re buying in-store:
- Moisture Content – Timber should be dry to the touch but not cracked. High moisture levels can cause warping or shrinking after installation.
- Timber Grade – Look for grading stamps (e.g., premium, select, standard) to ensure quality. Premium grades have fewer knots and more consistent grain.
- Straightness – Lay the board flat on the ground or eye it from the side. Avoid pieces that bow or twist, as these can be hard to work with and affect the final look of your deck.
Online Vs. In-Store Shopping
Both shopping methods have their pros and cons:
- Online – Convenient for price comparison and bulk ordering. You can read product specs and customer reviews before buying. Some suppliers offer delivery or click-and-collect options.
- In-Store – Allows you to inspect the timber firsthand. This is especially helpful for spotting defects, testing weight, or choosing between colour tones.
If you’re new to decking or unsure what to buy, visiting a physical store can make the process easier and help you avoid buying the wrong type of wood.
Support Local, Build Local
Choosing local suppliers not only boosts the economy but also ensures you’re getting timber suited to NZ’s weather and building regulations. Many smaller suppliers work directly with New Zealand sawmills and forestry operations, which means you’re more likely to get sustainably sourced and properly treated wood.
Whether you’re shopping at a national chain or your nearest timber yard, doing a bit of research and comparing options can make all the difference in how your deck looks and lasts.
Ready to build your dream deck? Explore top-quality decking timber options across NZ. Visit us to get started.
FAQs: About Decking Timber In NZ
What is the best decking timber to use in New Zealand?
The best decking timber in NZ depends on your needs. Pine is affordable and widely available. Kwila is durable and rich in colour. Vitex is a sustainable choice, and garapa offers low maintenance with a clean look. For coastal or high-moisture areas, hardwoods tend to last longer.
Is pine decking timber a good choice for NZ weather?
Yes, treated pine (H3.2 or H4) performs well in most NZ climates. It’s cost-effective and easy to work with. However, it may require regular maintenance like staining or oiling to extend its lifespan and prevent warping or splitting.
What is H3.2 and H4 timber treatment?
H3.2 is treated timber suitable for above-ground outdoor use, like decking boards. H4 is a stronger treatment level used for timber that touches the ground, like joists or fence posts. Both protect against rot, fungi, and insect damage.
How much does decking timber cost in NZ?
Prices vary depending on the timber type. Pine starts around $3–$5 per metre, while hardwoods like Kwila or Vitex can range from $8–$15 per metre. Additional costs include treatment, delivery, and fasteners. Buying in bulk may lower the overall cost.
How long does decking timber last?
Lifespan depends on the type and maintenance. Treated pine lasts 10–15 years with proper care. Hardwoods like Kwila or Vitex can last 20–30 years or more. Regular cleaning, sealing, or oiling will help your deck last longer.
Can I stain or oil decking timber?
Yes, most decking timbers can be stained or oiled to enhance colour and protect the wood. Oiling helps reduce cracking and maintains the timber’s natural tone. Hardwood timbers may need specific products to prevent surface bleeding or discoloration.
What are the most eco-friendly decking timber options in NZ?
Vitex and garapa are considered more sustainable, especially when sourced from certified forests (FSC). Locally grown treated pine is also eco-friendly due to reduced transport emissions. Always look for certified and legally harvested timber.
Do I need a building consent to install a deck in NZ?
In many cases, yes. If the deck is over 1.5 metres high or attached to a building, you may need consent. Local council rules vary, so it’s best to check with your local authority before starting any construction.
How do I maintain a timber deck in NZ?
Sweep regularly, clean off mold or dirt, and re-oil or stain annually if needed. Softwoods need more maintenance than hardwoods. Keep plants and furniture raised to allow airflow and reduce moisture damage.
Where can I buy quality decking timber in NZ?
You can buy decking timber from hardware stores like Mitre 10, Bunnings, ITM, or local timber merchants. Some suppliers also offer online ordering and delivery. Look for suppliers that provide treated, graded timber suitable for your project.
Conclusion
Choosing the right decking timber in NZ isn’t just about appearance, it directly affects how much you’ll spend, how your outdoor space will look over time, and how much effort you’ll put into maintenance. Some timbers offer great durability but come at a higher price, while others are budget-friendly but require more upkeep. That’s why it’s important to take a moment to weigh your options carefully. Think about your location, how much sun or rain your deck will get, and how much maintenance you’re realistically willing to do. If you’re unsure, visit a local timber merchant and ask for samples, seeing the grain, tone, and feel in person can help you make a more confident choice. Thinking of building a deck? Compare decking timber options today.
