10/03/2026 12:00 AM
1. Begin by measuring the fence run
For a fence run between two points, in a straight line across level ground: mark the start and end points of the run by driving short stakes/pegs into the ground or marking the ground and measure between the two points.
For a fence run across two points, with changes in direction across level ground: mark the start and end of the run by driving short stakes/pegs into the ground or marking the ground. Next, mark any changes in direction and measure between each marked point. Treat the distance between each point as an individual run.
For a fence run between two points, in a straight line across sloping ground: mark the start and end points of the run by driving long stakes/pegs into the ground. Next, run a plumb line by fixing a length of string horizontally between the two markers, ensure the string is taut then ‘true it’ using a spirit level. Finally, measure the horizontal distance between the two markers using the string as the guide.
2. Make your post selection
Our fence panels are designed for use with Slotted Jakposts® (Standard 100 x 100mm or Heavy-Duty 120 x 124mm) but may also be used with square section (non-slotted) posts (Standard 70 x 70mm or Heavy 91 x 91mm).Decide on the type of post you’d like to use then select the length of post required for the fence height* including the gravel board** and any topping/trellis you want to incorporate above the fence and between the posts.
A post is required to support the edges of each fence panel. In addition to the two basic styles of post we offer (Slotted Jakposts and square, non-slotted posts), Slotted Jakposts are also available in the following types:
- Intermediate Post (use to join panels along the fence run)
- Corner Post (use at the end of the run or to create a right angle)
- To create an end post, use an intermediate post with end post strip
- We also supply 45 degree angled posts for awkward fence runs. (image below)
3. Calculate the number of panels required
for your fence run
Use the overall measurement you have taken for each fence run and deduct the sectional dimensions of the selected posts required. Divide this dimension by the standard width of our fence panels (1.8m / 1800mm) to give you the number of full panels required, for example:
18m / 1.87m = 9.62 Jacksons fence panels
Where there is a requirement for a special size to fit between posts, these may be ordered as a ‘special’ or you can order our Panel Width Cut-Down Kits to suit the fence style selected. Some panels can be cut down on site, for more information read our blog on the following:
What is a fence panel cut down kit
Further help
Should you need additional help to or to confirm your calculations use our fence calculator.
Next Steps
Choosing a Fence Panel Style
After you have calculated how many panels you need, the next step is to decide which style you require. You can usually work backwards from what you want the fence to achieve. If you need a simple boundary, Featherboard is a suitable choice. If you need a very strong boundary that is difficult to climb, PineGroove with a Viking topper is ideal. Our fence builder can also help you choose from a wide range of fence panel styles, ensuring that you select the most appropriate option for your project.
Deciding if You Want to Install the Fence Yourself
Installing the Fence Panels Yourself
Many people install fence panels themselves, and with the design of our fencing systems they are reasonably simple to install. To ensure that the job goes well, it is important to use good tools. You will also find that a professional installer will know tips and tricks that help achieve a better finish than a typical do it yourself job. Watch our video on how to install a garden fence to understand the process.
Finding a Fencing Installer
We have an Approved Installer network where we vet fence installers and then recommend them. If you find a local Approved Installer, they will measure the site for you, discuss different fence styles, and give you an idea of costs.
Call us for help if required on 0800 408 2234. If you are intending to have the fencing installed, we would suggest you consider employing the services of our Approved Installers, or if you want to install the fence yourself, take a look at the Installation Instructions available to download.
Additional resources
Use our Fence Builder to automatically calculate how many panels you need, along with all the additional components required for your project.
Use our comparison tool to review different fence panel styles and find the option that best suits your garden.
Read our blog on concrete or wooden fence panels, which explains the benefits of each material and helps you decide which option is most suitable.
Concrete Or Wooden Fence Posts?
Read our blog on privacy fence panels. Privacy fence panels are the most common style for boundary projects, and they can look impressive. With the addition of toppers they can appear unique and less imposing while still providing valuable height and privacy.
Read our blog on the many things to consider when choosing a fence, which provides helpful guidance and clear advice to support your project.
What To Consider When Choosing A Fence
Download our Good Fencing Guide Brochure
This blog and content was updated in March 2026. Originally written in 2018