Fence panel types and sizes: a UK buyer’s guide

In the UK, the standard fence panel width is 6 feet (1.83m or 1830mm). Standard panel heights are 3ft (910mm), 4ft (1220mm), 5ft (1520mm), and 6ft (1830mm). Fence posts must extend 2ft (600mm) deeper into the ground than the panel, while gravel boards add 150mm to total height.

Buying replacement garden fencing in the UK appears straightforward until you encounter conflicting metric and imperial measurements, planning height limits, and panels that unexpectedly blow out in winter storms. Choosing the correct panel size, style, and compatible post framework ensures your boundary remains structurally sound and fully compliant with UK property regulations for decades.

What are the standard fence panel sizes in the UK?

Standard UK fence panels are universally manufactured to a width of 6 feet (1830mm), while heights follow four standardised increments from 3 feet up to 6 feet. This consistent dimensional standard allows British homeowners to replace damaged modular panels between existing posts without altering bay spacing.

Standard UK fence panel width: why everything is 6 feet (1.83m)

All traditional British timber fence panels are constructed to a fixed nominal width of 6 feet, which converts to 1.8288 metres and is manufactured industrially as 1830mm. This historical standard originates from imperial building measurements, where garden boundary runs were laid out in six-foot bays between wooden or concrete slotted posts.

Because UK post centres—the measurement from the centre of one post to the centre of the next—are installed precisely to accommodate this 1830mm dimension plus the slot depth, you cannot alter panel width without unseating cemented fence posts. While height can vary freely between properties or even along stepped sections of a sloping garden, the 1830mm width remains the foundational metric across UK domestic fencing.

The four standard UK fence panel heights: 3ft, 4ft, 5ft, and 6ft

UK timber merchants manufacture garden panels in four standard heights, each engineered for a distinct boundary function:

• 3ft Panels (0.91m / 910mm): Designed primarily for low-level front garden boundaries, decorative driveway dividing lines, and interior garden zoning around vegetable patches or patios. These panels establish clear legal boundary demarcation without obstructing natural light or street visibility.
• 4ft Panels (1.22m / 1220mm): A balanced height that provides moderate containment for pets and young children while preserving open garden sightlines. Frequently installed along side passages, shared driveway divides, and boundary lines where neighbours agree to maintain an open, social feel.
• 5ft Panels (1.52m / 1520mm): Popular in sheltered rear gardens where homeowners want effective screening while sitting down, without creating the claustrophobic boxing-in effect of taller timber structures. When paired with a gravel board, 5ft panels achieve a finished height of approximately 1.67m.
• 6ft Panels (1.83m / 1830mm): The benchmark choice for rear garden boundaries across the UK, offering complete visual privacy and strong physical deterrence. Commonly referred to as a "6x6 fence panel" (6ft high by 6ft wide), it is the tallest standard panel permitted under UK domestic building conventions.

Complete metric and imperial fence panel size conversion table

UK fencing combines imperial sizing conventions with metric manufacturing tolerances. The reference table below details exact dimensions across all standard domestic panel sizes:

The 30mm continental trap: why European panels fail in UK concrete posts

European continental fence panels are manufactured to a metric width of 1.80 metres (1800mm), making them exactly 30mm (1.2 inches) narrower than standard UK 6ft panels (1830mm). Inserting an unmodified 1800mm continental panel into pre-existing UK concrete slotted posts causes the panel to slip out of the post channels during high winds.

UK standard (1830mm) vs continental (1800mm) width differences

Many decorative, horizontal slatted, and curved lattice panels sold by national DIY retailers (including Wickes and B&Q) or imported from mainland Europe are built to metric European specifications. In European manufacturing, panels are made to a clean 1.80m x 1.80m square rather than imperial British conversions.

Standard UK concrete slotted H-posts are pre-cast with a channel depth of roughly 20mm to 25mm on each side. When spaced for standard 1830mm panels, the gap between post channels is approximately 1835mm. If you slot a 1800mm continental panel into this opening, only 5mm of timber rests inside each channel. As soon as timber expands and contracts with UK rain, or when lateral wind pressure hits the fence face, the panel flexes and collapses out of the posts.

UK Standard Bay (1835mm opening between concrete post channels):
[Post] |<================ 1830mm UK Panel ================>| [Post]  --> 20mm secure seat each side

Continental Panel in UK Bay:
[Post] |<--- 1800mm Continental Panel --->| [Post]  --> Only 5mm seat! Fails under wind load

How to make a 1800mm continental panel fit 6ft slotted posts

To securely install a 1800mm continental panel into existing UK 6ft slotted posts, you must attach treated timber extension battens to both vertical outer stiles of the panel before installation.

Purchase pressure-treated timber battens measuring 15mm thick, 45mm to 50mm wide, and matching the exact height of your panel (e.g., 1800mm). Fix one 15mm batten firmly to the left side frame and one 15mm batten to the right side frame using exterior-grade 50mm stainless steel or galvanised screws. This adds exactly 30mm of structural timber, increasing the total panel width from 1800mm to the required 1830mm. The extended panel will now slide down smoothly into standard concrete channels with a full 20mm seating depth on both ends.

Feather edge vs lap panels: which fence type should you choose?

Feather edge (closeboard) panels provide superior structural strength and wind resistance through thick, overlapping vertical boards, whereas waney lap panels offer a lightweight, budget-friendly boundary constructed from thin horizontal slats. Choosing between them depends on wind exposure, long-term maintenance expectations, and budget.

Waney lap panels: budget boundaries and sheltered gardens

Waney lap panels—also sold as overlap, wavy lap, or horizontal lap panels—are the most widely installed budget boundary panels across the UK. They are constructed from thin (approximately 5mm) horizontal rough-sawn softwood slats that overlap by roughly 25mm, pinned within a lightweight perimeter timber frame and reinforced with vertical timber battens.

The principal advantage of waney lap is affordability. They cost roughly half the price of closeboard panels, making them an attractive choice for rental properties, sheltered suburban housing estates, or extensive boundary replacements on a tight budget. However, lap panels are vulnerable to gale-force winds. Because the thin horizontal slats catch wind like a solid sail, high wind pressure frequently pops the factory staples, splintering the slats and necessitating complete panel replacement.

Closeboard and feather edge panels: heavy-duty wind resistance

Closeboard fencing (traditionally known as feather edge) is constructed from robust vertical tapered timber pales that overlap by 25mm (1 inch) and are nailed directly to heavy horizontal arris or backing rails. The tapered boards are thicker at one edge (typically 10mm to 13mm) and taper down across their width, creating a dense, interlocking vertical timber wall.

This vertical construction gives feather edge panels outstanding rigidity and resistance against lateral wind pressure. Furthermore, closeboard panels offer exceptional modular repairability: if an overhanging tree branch or freak gust cracks two boards, a homeowner can lever out the damaged individual pales and nail in replacement feather edge boards for a couple of pounds, without replacing the entire panel. For exposed countryside gardens, coastal locations, and urban wind tunnels, closeboard is the industry standard.

Contemporary slatted and hit-and-miss panels: modern airflow screens

Contemporary horizontal slatted and hit-and-miss panels feature precision-cut horizontal slats mounted with intentional gaps or alternating front-and-back configurations. These panels provide an architectural, modern design aesthetic while performing an essential aerodynamic function.

Unlike solid waney lap fencing, slatted designs allow roughly 30% to 40% of wind volume to filter harmlessly through the panel gaps. This aerodynamic relief dramatically lowers the lateral wind loading exerted on posts and concrete ground anchors, preventing structural post snap during severe winter storms. Hit-and-miss panels alternate slats on either side of the framework, giving the visual privacy of a solid fence while retaining crucial air permeability.

Construction, lifespan, and cost comparison matrix

What size fence posts do you need for each panel height?

Fence posts must be a minimum of 2 feet (600mm) longer than the finished height of your fence panels to ensure adequate in-ground anchoring. For a standard 6ft (1.83m) fence panel without a gravel board, you must install an 8ft (2.4m) post; if adding a 150mm gravel board, a 9ft (2.7m) post is recommended.

The 2ft in-ground rule: calculating minimum post length

In UK structural fencing, fence posts act as vertical cantilever beams that absorb hundreds of kilograms of lateral wind pressure. British Standard 1722-1 specifies that a minimum of one-third of the post's above-ground height—and never less than 600mm (2ft)—must be securely set in concrete beneath ground level.

Failing to bury fence posts at least 600mm deep leaves the fence vulnerable to frost heave and ground saturation. During wet UK winters, soil softens; if a post hole is only 400mm deep, the rotational leverage created by high winds against a 6ft panel will easily lever the post base out of the ground, toppling the entire fence run.

Required Post Length = Panel Height + Gravel Board Height + 600mm (In-Ground Depth)

Post sizing table: panel height vs total post length and hole depth

Note: Dig post holes three times the width of the post (e.g., 300mm wide for a 100mm post) to ensure an adequate concrete collar around the timber or concrete base.

Timber vs concrete vs DuraPost: which material lasts longest?

Selecting the right post material dictates the structural lifespan of your boundary:

• Pressure-Treated Timber Posts (100mm x 100mm): Offer a traditional timber appearance and allow panels to be screwed directly to the post face. However, ground-line rotting is common after 10–15 years where moist soil meets air, causing premature post failure even if the panel remains intact.
• Pre-Cast Concrete Slotted H-Posts: Concrete posts are immune to ground decay, rot, and insect damage, routinely lasting 25 to 35+ years. Their pre-formed vertical slots allow timber panels and concrete gravel boards to slide in effortlessly without metal brackets. Their primary downside is substantial weight (up to 40kg per post), requiring two people to handle and install.
• DuraPost Cold-Rolled Galvanised Steel Posts: A modern lightweight alternative made from high-strength galvanised steel. They weigh only 7.5kg (roughly 80% lighter than concrete), fit all standard 6ft panels, and are wind-tested to withstand gales up to 110 mph. Backed by manufacturer guarantees up to 25 years, DuraPost combines the durability of concrete with the easy installation of timber.

How do gravel boards and planning permission affect fence height?

Under UK Permitted Development Rights, a garden fence may stand up to 2.0 metres (6ft 6.7in) tall along rear and side boundaries without planning permission, but must not exceed 1.0 metre (3ft 3in) if adjacent to a vehicular highway. Adding a standard 150mm gravel board beneath a 6ft panel reaches 1.98 metres, keeping the fence completely legal.

Why gravel boards are crucial for panel longevity

A gravel board is a horizontal timber or pre-cast concrete plinth installed along the ground between posts, sitting directly underneath the fence panel. Its primary function is to isolate the delicate end-grain of wooden panels from damp soil, wet turf, and surface pooling.

Timber absorbs moisture through capillary action in its bottom edges. If wooden fence panels rest directly on wet earth, moisture wicks upward into the framing, causing fungal rot and insect decay within 3 to 5 years. By lifting the panel 150mm off the ground onto a sacrificial gravel board, the panel stays dry. If a timber gravel board eventually degrades, replacing a single £12 board takes 10 minutes—preserving the £60 panel above it.

The 2-metre planning rule: avoiding unlawful fence heights

Homeowners commonly assume that because a 6ft panel is 1.83m high, they can add any gravel board or trellis topper they like. In reality, the Town and Country Planning (General Permitted Development) Order strictly caps rear and side boundary structures at 2.00 metres total height from existing ground level without planning permission.

• 6ft Panel (1830mm) + 150mm (6-inch) Gravel Board = 1.98m (6ft 6in). This common combination is fully compliant, leaving a 20mm margin beneath the statutory 2.00m ceiling.
• 6ft Panel (1830mm) + 300mm (12-inch) Gravel Board = 2.13m (7ft). This combination breaches UK planning law. Installing a 300mm gravel board beneath a full 6ft panel without planning approval exposes you to council enforcement notices requiring the fence to be cut down or dismantled.
• Trellis Toppers Count Toward the Limit: Attaching a 1ft (300mm) decorative trellis topper on top of a 6ft panel also pushes total boundary height to 2.13m, which requires formal planning permission from your local planning authority.

Highway and front garden fencing: the strict 1-metre restriction

Any boundary fence running adjacent to a road, vehicular highway, or pedestrian pavement used by traffic is legally limited to a maximum height of 1.0 metre (3 feet 3.3 inches) under permitted development rules.

Erecting a 4ft, 5ft, or 6ft fence along a front driveway or front garden boundary bordering a road requires full planning permission. Councils enforce this restriction rigorously to preserve vehicular sightlines at junctions and driveways. Homeowners replacing front boundary fences should install standard 3ft (910mm) panels on 5ft posts to ensure lawful, hassle-free installation.

How to measure and calculate fence panels for your boundary

To determine how many fence panels you need, divide the total linear length of your garden boundary in metres by 1.83m (or total length in feet by 6), then round up to the nearest whole number. Always order one more post than the total number of panels to close the final bay.

The panel and post calculation formula

Measuring a garden boundary requires converting linear distance into standard modular bays:

• Total Panels Needed = Total Boundary Length (m) ÷ 1.83 (rounded up)
• Total Posts Needed = Total Panels + 1

Worked Example: If your rear boundary measures 18.3 metres (60 feet) in length:

1. Divide 18.3m by 1.83m = 10 panels.
2. Add 1 post to close the final run: 10 + 1 = 11 posts.
3. Order 10 gravel boards (1.83m each) and 22 to 33 bags of Postcrete (2 to 3 bags per post hole).

Remember that fence posts add width to the total run. A standard 100mm timber post adds roughly 4 inches between panel faces, while concrete slotted posts add approximately 50mm of centre spacing. Over a long 15-panel run, post widths accumulate up to an additional metre of boundary coverage, which frequently saves you from buying an extra panel.

Handling odd lengths: how to safely cut down fence panels

Because real garden boundaries rarely measure in exact multiples of 1.83 metres, the final panel in a run almost always requires custom trimming on site.

To safely reduce a panel’s width:

1. Measure the exact opening between the face of the penultimate post and the final corner post.
2. Deduct 10mm to allow for thermal expansion and concrete channel clearance.
3. Mark a vertical cut line across the panel boards.
4. Carefully pry off the vertical timber framing battens from the offcut edge.
5. Cut the horizontal rails or slats along your line using a handsaw or circular saw.
6. Re-affix the vertical framing batten to the newly cut edge using galvanised screws.
7. Treat all cut timber ends immediately with a brush-on end-grain wood preservative to prevent premature rot.

Alternatively, purchase a proprietary manufacturer panel cut-down kit, which includes pre-drilled framing battens and fixings designed specifically for on-site resizing.

Estimate your whole-project installation cost with our fencing calculator

Calculating material quantities is only the first step in planning a fencing project. The overall cost depends heavily on whether you install panels yourself or hire professional trade contractors, as well as waste removal fees for clearing old rotted panels.

To generate an accurate, bespoke material and labour estimate tailored to your exact garden perimeter, use our online fencing cost calculator. For a deeper breakdown of material costs per metre across timber, composite, and metal, explore our comprehensive guide to how much fencing costs in the UK per metre. If you are budgeting for a complete property boundary, review our breakdown of the total cost to fence a garden, or check current trade labour rates in our guide to how much fencing contractors charge in the UK.

Frequently asked questions

A quick note

Indicative dimensions and specifications based on British Standard 1722 and UK timber trade standards. Permitted development rules cited are for England — local authorities, conservation areas and listed buildings may enforce stricter limits. Always measure existing post centres before ordering replacement panels. See our full disclaimer.

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