Fencing Project Estimator UK

Fencing components are determined by run length divided by panel width (standard UK panel = 1.83m / 6ft). For 2026 professional installs, calculate panels + 1 extra post for the end of the run. Standard post depth is 600mm with 1.5 to 2 bags of Postcrete (20kg) per post to ensure stability against wind loads.

Fence Specifications

Measure the total length of the area you wish to fence.

Standard UK garden height is 6ft (1.8m).

Concrete posts are rot-proof and "fit & forget," but more expensive.

Materials Required

Note: Calculations assume one continuous run of fencing. If you have corners or breaks, you may need additional posts.
Estimated Material Cost: £0
(Based on UK trade averages for pressure-treated timber)
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Choosing Between Fence Panels vs Feather Edge

When planning a new boundary for your garden, the two most popular methods in the UK are pre-made fence panels and build-on-site feather edge (also known as closeboard) fencing. Each has its advantages depending on your budget, skill level, and the slope of your garden.

Fence Panels (The Fast Option)

Fence panels are the go-to for DIYers. They come in standard 6ft (1.83m) widths and varying heights. They are quick to install—you simply slot them into concrete or timber posts. However, they are less flexible on sloping ground and can be difficult to handle alone.

Feather Edge / Closeboard (The Strong Option)

Feather edge fencing is built from scratch on-site. You install the posts, then nail horizontal rails across them, and finally attach vertical, overlapping boards. This method is incredibly strong and allows you to "rake" the fence perfectly to follow any slopes or curves in your garden. It is the preferred choice for professional landscapers.

How many bags of Postcrete do I need?

For a standard 6ft garden fence post, the general rule of thumb is 1.5 to 2 bags of Postcrete per hole. Our calculator assumes 2 bags per post to ensure a solid foundation that won't move during high winds.

Timber Posts vs Concrete Posts: A Detailed Comparison

Choosing the right posts is as important as the panels themselves. Your decision usually comes down to three factors: Durability, Cost, and Skill Level.

Maintenance Tip: The Mist Coat & Treatment

If you've opted for timber, don't forget to treat your fence annually. Using a professional-grade wood preserver or "duck's back" paint will repel water and prevent the timber from becoming waterlogged, which is the primary cause of wind damage (waterlogged wood is heavy and brittle).

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UK Building Regulations: Fences & Boundaries

Erecting a garden fence is generally "Permitted Development", but you must adhere to height restrictions to avoid planning disputes:

  • Height Limit (Rear/Side): You can usually install a fence up to 2 metres (6.5ft) high without needing planning permission.
  • Height Next to Highway: If the fence is adjacent to a road or a footpath used by vehicles, the limit is typically 1 metre high.
  • Trellis & Extensions: Adding a trellis on top of a 2m fence usually counts as part of the total height and may require permission.
  • Ownership: Ensure you are erecting the fence on your side of the boundary. Check your property deeds (TP1 documents) if unsure who owns the boundary.
View official Planning Portal guidance

Frequently Asked Questions

How deep should fence posts be?

For a standard 6ft (1.8m) fence, your posts should be at least 2ft (600mm) in the ground. This means you should buy 8ft (2.4m) posts. For 4ft fences, 1.5ft depth is usually sufficient.

What is a gravel board and do I need one?

A gravel board is a protective board that sits at the bottom of the fence. It prevents the main panels or boards from touching the wet ground. Without one, the bottom of your fence will rot within a few years. Concrete gravel boards are essential when using concrete posts.

Arris Rails vs Cant Rails: What's the difference?

Arris rails are triangular-shaped and fit into pre-cut mortice holes in the posts. Cant rails are square-cut with a sloped top to shed water. Arris rails are stronger but harder to install if you aren't using pre-morticed posts.

Do I need planning permission for a fence?

In most parts of the UK, you can build a fence up to 2 metres (6.5ft) high without planning permission. If the fence is adjacent to a highway or footpath, the limit is usually 1 metre.

How much spacing should I leave between posts?

For panel fencing, the spacing is fixed at 1.83m (6ft). For feather edge, you have more flexibility, but the standard is 1.8m to ensure a strong frame that won't sag over time.