How to Build a Fence NZ — DIY Guide
How to build a fence in NZ — post spacing, concrete depth, timber selection, and whether you need consent. Step-by-step DIY guide for NZ homeowners.
Introduction
When it comes to DIY projects in New Zealand, building a fence is one of the most popular tasks undertaken by homeowners. Not only can a well-built fence enhance the aesthetic appeal of your property, but it can also provide privacy, security, and define your boundary lines. While some fencing projects may require the expertise of a professional, many can be completed by DIY enthusiasts with the right guidance. In this comprehensive guide, we will walk you through the step-by-step process of building a fence in NZ, covering everything from materials and planning to construction and maintenance. Whether you're looking to save money or simply enjoy the satisfaction of a job well done, this guide is designed to help you achieve a high-quality fence that meets your needs and complies with NZ regulations.
Before embarking on your fencing project, it's essential to determine whether you can DIY or need to hire a professional. If your fence is complex, requires specialized skills, or is part of a larger construction project, it's best to consult a licensed builder or fencer. However, for simple fence constructions, DIY can be a cost-effective and rewarding option. This guide covers the entire process, from planning and materials selection to construction and maintenance, so you can make an informed decision about your project.
Do you need building consent?
Under Schedule 1 of the Building Act 2004, fences under 2.5m in height do not require a building consent. However, it's crucial to check your district plan for boundary setbacks and height rules, as these can vary depending on your location. For example, if you live in a heritage zone or have a covenant on your property, there may be specific regulations governing fence height and design. Pool fencing, on the other hand, has separate mandatory requirements, and you must ensure that your fence complies with the Fencing of Swimming Pools Act 1987. Failure to comply with these regulations can result in fines and even legal action, so it's essential to do your research and plan carefully.
To determine whether you need a building consent, you can visit the Ministry of Business, Innovation and Employment (MBIE) website or consult with your local council. They can provide you with information on the specific regulations and requirements for your area. Additionally, you can check the MBIE's website for guidance on the Building Act 2004 and the Fencing of Swimming Pools Act 1987.
Materials
When it comes to choosing materials for your fence, there are several options to consider. The most common materials used for fencing in NZ are timber, metal, and concrete.
Timber
Timber is a popular choice for fencing due to its natural aesthetic appeal and durability. For posts, it's recommended to use H3.2 treated pine, which has been treated to resist rot and insect damage. However, if the posts will be in contact with the ground, a minimum of H4 treatment is required. Other timber options include macrocarpa and cedar, which are naturally resistant to rot and insect damage.
When choosing post size, it's essential to consider the height of your fence. For a 1.8m fence, a minimum post size of 90x90mm is recommended. You can use a larger post size if you prefer, but this will increase the cost of your materials.
| Timber Type | Treatment Rating | Cost per metre |
|---|---|---|
| H3.2 Treated Pine | H3.2 | $25-$40 |
| Macrocarpa | None | $40-$60 |
| Cedar | None | $50-$80 |
Metal
Metal fencing is a popular choice for modern homes, as it provides a sleek and contemporary look. Colorbond, tubular steel, and aluminium are all popular options for metal fencing. Metal fencing is durable and low maintenance, but it can be more expensive than timber.
| Metal Type | Cost per metre |
|---|---|
| Colorbond | $30-$50 |
| Tubular Steel | $40-$60 |
| Aluminium | $50-$80 |
Concrete
Concrete fencing is a cost-effective option that can provide a durable and long-lasting fence. Pre-cast concrete panels are a popular choice, as they are quick and easy to install. However, they can be heavy, so it's essential to ensure that your foundation is strong enough to support the weight.
| Concrete Type | Cost per metre |
|---|---|
| Pre-cast Concrete Panels | $20-$30 |
Bamboo and Privacy Screen Options
Bamboo and privacy screens are popular options for homeowners who want to add a natural and decorative element to their fence. Bamboo is a sustainable and eco-friendly option, while privacy screens can provide an additional layer of security and privacy.
| Bamboo/Privacy Screen Type | Cost per metre |
|---|---|
| Bamboo | $30-$50 |
| Privacy Screen | $40-$60 |
Post Caps
Post caps are an essential component of any fence, as they prevent water from entering the post and causing rot and damage. There are several types of post caps available, including plastic, metal, and timber.
| Post Cap Type | Cost per unit |
|---|---|
| Plastic | $5-$10 |
| Metal | $10-$20 |
| Timber | $15-$30 |
Laying out the fence line
Before you start constructing your fence, it's essential to lay out the fence line. This involves marking the boundary of your property and determining the location of your fence posts. You can use a string line and spirit level to ensure that your fence line is straight and level.
To lay out the fence line, follow these steps:
- Mark the boundary of your property using a string line and stakes.
- Determine the location of your fence posts, spacing them 1.8-2.4m apart for timber fencing.
- Use a spirit level to ensure that your fence line is level and plumb.
- Mark the location of your corner posts, which should be slightly larger than your standard posts.
Setting posts
Setting posts is the most critical step in building a fence, as it provides the foundation for the entire structure. To set posts, you'll need to dig holes that are deep enough to accommodate the post and concrete.
The hole depth should be at least 1/3 of the post length in the ground, which is typically 600mm for a 1.8m fence. The diameter of the hole should be 3x the width of the post, which is 270mm for a 90x90mm post.
To set posts, follow these steps:
- Dig the hole to the required depth and diameter.
- Place the post in the hole, ensuring that it is plumb and level.
- Fill the hole with concrete, tamping the first 100mm to remove any air pockets.
- Use rapid-set concrete to set the post in place, which should take around 24-48 hours to set.
- Brace the post while the concrete sets, using temporary supports to keep it plumb and level.
Rails and palings
Once your posts are set, you can start installing the rails and palings. The rails should be spaced evenly apart, with the top rail around 100mm from the top of the post.
To install the palings, follow these steps:
- Cut the palings to the required length, leaving a 15mm gap between each paling to allow for swelling.
- Nail or screw the palings to the rails, using galvanised fixings to prevent rust.
- Check the level of the palings as you go, ensuring that they are straight and level.
- Use a spirit level to ensure that the palings are plumb and level.
Gates
Gates are an essential component of any fence, providing access to your property. To build a gate, you'll need to construct a frame using timber or metal, and then attach the gate to the fence post using hinges and a latch.
To build a gate, follow these steps:
- Determine the size of your gate, which should be around 1-2m wide.
- Construct the gate frame using timber or metal, bracing the frame diagonally for added strength.
- Attach the gate to the fence post using hinges, ensuring that the gate is level and plumb.
- Install a latch, which should be secure and easy to use.
Painting or staining
Once your fence is complete, you can paint or stain it to protect the timber and enhance its appearance. There are several options available, including penetrating oil, paint, and stain.
Penetrating oil is a popular choice, as it protects the timber without forming a film on the surface. Cutek and Deks Olje D1 are two popular brands of penetrating oil, which can be applied to the timber using a brush or roller.
To apply penetrating oil, follow these steps:
- Clean the timber surface to remove any dirt or debris.
- Apply the penetrating oil to the timber, using a brush or roller.
- Allow the oil to dry, which should take around 24-48 hours.
- Re-apply the oil every 1-2 years, or as recommended by the manufacturer.
Common mistakes
When building a fence, there are several common mistakes to avoid. These include:
- Posts not deep enough, which can cause the fence to lean or collapse.
- Wrong timber treatment rating, which can lead to rot and insect damage.
- No post caps, which can allow water to enter the post and cause damage.
- Palings butted too tight, which can cause the timber to swell and warp.
- Not checking for underground services before digging, which can cause damage to pipes and cables.
FAQ
Here are some frequently asked questions about building a fence in NZ:
- How close to the boundary can I build a fence? You can build a fence up to the boundary of your property, but you should check with your neighbour and local council to ensure that you are not encroaching on their property.
- How long will a treated pine fence last? A treated pine fence can last for 10-20 years, depending on the treatment rating and maintenance.
- Do I need my neighbour's agreement for a boundary fence? Yes, you should obtain your neighbour's agreement before building a boundary fence, as it may affect their property.
- How much does it cost to hire a fencer? The cost of hiring a fencer can range from $80-$160 per metre, depending on the type of fence and materials used.
- What are the benefits of using a DIY fencing kit? A DIY fencing kit can save you money and provide a sense of satisfaction, but it may not be as durable or long-lasting as a professionally built fence.
Conclusion
Building a fence in NZ can be a rewarding DIY project, but it requires careful planning and attention to detail. By following the steps outlined in this guide, you can create a high-quality fence that meets your needs and complies with NZ regulations. Remember to choose the right materials, lay out the fence line carefully, and set the posts correctly to ensure a strong and durable fence.
To get started on your fencing project, visit tradietools.nz/calculators/fence-calculator to calculate the cost of your materials and tradietools.nz/trades/fencers/ to find a licensed fencer in your area. You can also use tools like Xero for invoicing and job management, Fergus for job scheduling and tracking, and Tradify for quoting and project management to help you manage your project and stay organized.
By following this guide and using the right tools and resources, you can build a high-quality fence that enhances the value and appeal of your property. So why not get started today and create a fence that you can be proud of?