Category: Landscaping

Like all construction projects, building a fence takes time, careful planning and hard work. However, the result is something that can last for years, and may well add value to your property, enhance recreation space, or give an outside area a newly designated purpose.

Are you replacing an old fence or building in a new area?

Does an existing fence need to be removed first? Whose property is it on, yours or your neighbours? If there is a new area that requires fencing around your home, make sure that you are not building in the wrong place. Also, make sure you’re not building a fence across anything important, like guttering or a sewer that requires access. Do you need access to a neighbours garden to install your fence?

In most cases, you don’t need planning permission to erect a fence less than 2m high, but it’s best to check with your local planning authority if you’re unsure of restrictions.

You may need planning permission if your fence will border a Public Right of Way.

Planning your new fence

Although it’s possible to build a fence all year round, try to avoid very hot, cold, or wet weather conditions. Early spring or late autumn are ideal times as they cause the least disturbance to plant and soil health.

Use a CAT detector to scan for underground pipes and cables before you start. If you do find any cables, you will probably need to amend your plans.

Use pegs or bamboo canes and string to mark out where your fence line and posts will be. Most fence panels are sold as a standard 183cm wide, but other sizes are available. Use a batten that’s cut to the same length as your panels as a guide, and carefully mark out where the centre point of each post will be.

If you are using concrete or Postcrete to secure your posts then you will need a post hole 450-600mm in-depth, and a fence post up to 8ft high. Be sure to check the manufacturer’s instructions of concrete or Postcrete, and plan accordingly before you buy the timber.

Similarly, adding gravel boards or trellis will affect the height of your fence and the length of the fence post you need. Again, make sure you have measured and planned accurately before you buy your timber.

What kind of fencing would you like?

There are lots of different types of fencing to choose from that can be used across your home. You can choose from lap panels to build across your garden, or picket panels that you can add around the front of your home, decorative panels, or even something more specific.

Depending on what the weather’s like for most of the year you may want to consider a different type of fencing over another. Heavy duty timber fences are very versatile and strong, but there are also different techniques used like in closeboard fencing for instance.

How to put up a fence

When putting up fencing, there are a few basic rules you should follow to ensure a stable and durable end result. Even though the fence posts are already treated, it’s a good idea to soak the base of the posts into wood preservative before installation.

Always use treated wood and exterior grade screws to prevent premature rotting and rusting. Even if you are installing a pressure-treated fence panel it should be raised a minimum of 50mm above the ground to help prevent rotting.

If you are installing a fence onto a sloping area, keep the fence panels along a horizontal line but fill the angled gap at the base by cutting a gravel board to size. Some heavily sloped areas will require a different method of installation, so seek specialist advice on how to build your fence in those instances.

Although it’s possible to erect a fence on your own it’s always safest to get somebody to help you.

When using Postcrete wear a dust mask, safety goggles and protective gloves, and be sure to follow the manufacturer’s instructions. Wear protective gloves when handling wood and applying wood preserver. Offcuts of timber should be disposed of safely – your local recycling centre should be able to help and advise.

How to fit fence posts

Step 1

Once you have scanned the area for cables and marked out the fence line with bamboo poles and string, you are ready to install your new fence. Remove any rocks or debris from the area and carefully dig up any small plants or shrubs that you want to replant once the fence is in position.

Step 2

Mark out the position of your first fence post and dig a hole appropriate to the length of the post you are using. As previously mentioned, a standard hole would be 450-600mm deep and 300mm wide. If you’re digging into soft ground though, you may need a deeper hole and a longer post.

Step 3

Add roughly 25mm of gravel or MOT type 1 to the bottom of the hole. This will help with drainage and reduce the chance of the post rotting over time.

Step 4

Place your first fence post into the hole, and use a spirit level to position the post, making sure that it’s vertically level on two adjacent sides. At this point it helps to screw two timber battens to the post to temporarily secure it in position.

Step 5

Following the manufacturer’s instructions, carefully add Postcrete to the hole. Fill the hole until the Postcrete is 25mm beneath the surface line. Make sure your fence post stays level.

Step 6

Use a trowel to create a gentle slope in the Postcrete so that rainwater will run away from the fence post on all sides. Once the Postcrete has set you can remove the timber props.

Step 7

Repeat the above process until all the fence posts are securely in place, checking as you go that each one is exactly vertical.

Step 8

As you go along, lay a piece of timber across the top of two consecutive posts and use a spirit level to check the posts are level. If necessary, trim the tops of the posts down so they are all the same height.

How to cut a fence panel

Step 1

You will often need to trim a fence panel to fit a required space. Firstly, measure out the section you need, and mark a saw guideline. Then remove the framing battens from the front and back of the section you will be cutting.

Step 2

If you re-attach the battens to the new marked edge, then you can also use them as a secure guideline for sawing. Make sure you saw the panel flush with the outer edge of the repositioned batten. You may also need to reposition the centre battens too.


How to attach trellis to your fence

Step 1

If you have included a trellis in your plans, then you should have ordered fence posts which will accommodate the height of the trellis.

Step 2

Measure and mark whereabouts on the fence post the trellis will be positioned and fix a U bracket to the posts. The number of brackets you need may depend on local conditions. You will need more brackets in a particularly exposed or windy location.

Step 3

Slide the trellis into position and secure using 35mm external grade screws. Repeat this process until all your trellis is attached.

Step 4

To add a neat finish to your fence posts you can protect them by adding a post cap. Pre-drill a hole into the top of the fence post, before screwing the cap in place.

Painting, Varnishing or Sealing Your Fence

Wood is an easy material to work with, but it requires a sealant to protect it from the elements and keep it in good condition. With a fence, you have numerous options and can choose to oil it annually with linseed or other oil, to seal it with a sealant or varnish that is gloss or matte, or to paint it with gloss, satin or matte paint.

If you opt for the paint, you are not limited to natural colours and can choose a shade that suits your house or the area in which you have erected your fence. Whatever option you go for, bear in mind that a wooden fence takes maintenance, and you may need to revarnish or repaint every few years to ensure that it stays looking as good as new, and the wood doesn't get damaged by the elements.


If you have any questions about building a fence or want to buy the necessary supplies, IBT is your one-stop-shop. We can help you start your project and ensure that you have everything you need to complete the construction process and build a fence that lasts.

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