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Most plots here sit on shrink–swell clay. Do a quick check. Roll a damp ribbon in your hand; if it holds shape and feels smooth and sticky, it is clay. A jar test also helps: shake soil and water in a jar and let it settle to see the clay layer.
Dig a 300 mm trial hole. Fill it with water and time the drain-down. If it still sits after 60–120 minutes, plan for drainage in the footing. Note shade, wind exposure and nearby trees. These increase movement risk. For more local tips, see our blog. Essex Concrete and Fencing tests mixes on Essex clay, so the steps below are proven.
Decide fence height and type first. Higher fences face more wind, so reduce bay width and deepen footings. Typical spacing is 1.8–2.4 m for panels and up to 3.0 m for rail-and-board, adjusted for exposure.
Brace corners, ends and gate posts. Make these deeper and wider than mid-bays. Check limits before you start; see the 2m fence height regulations in the UK. If you are still weighing up materials, read choosing fence materials in Essex for pros and cons in local weather.
Clay moves with seasons. Concrete slotted posts resist rot and are less affected by shrink–swell. Pair them with concrete gravelboards to keep panels clear of wet ground. They also make panel swaps simple.
In exposed spots, closeboard is tougher than light overlap. A solid frame with rails and feather edge copes better with gusts. See our concrete slotted posts and closeboard fence panels for durable options that suit clay ground.
This image was generated with AI and may not always represent the product or service exactly.
For 1.5–1.8 m fences, aim 750–900 mm deep in Colchester clay. For 2.0 m fences, go 900 mm or more where practical. Hole width should be 250–300 mm for 100–125 mm posts. These figures improve stability and reduce seasonal lift.
Keep the sides straight and slightly rough, not flared. Avoid a smooth, bowl-shaped hole that encourages heave. Shape the top of the footing to fall away from the post. This sheds water and protects the ground line, especially for timber.
Put drainage in before concrete. Add 100–150 mm of clean 20 mm shingle at the base for a gravel sump. It lets water escape from the bottom of the footing and reduces softening of the clay.
If water lingers, cut a narrow side channel to a free-draining spot and fill it with the same shingle. Finish the top with a neat domed cap that falls away from the post so water runs off, not in.
Control water. Bail out standing water before setting. In wet holes, pre-mix to a stiff, no-slump consistency in a bucket. Never tip dry mix into a wet hole. Place in layers and rod each lift so it bonds to the hole sides.
Allow 2–3 bags for 100 mm posts in 250–300 mm holes; 3–4 bags for 125 mm or gate posts. Let it set for at least 24 hours before fitting panels and 48 hours before hanging gates. Choose a reliable post mix that suits wet ground.
Mark lines and heights. Dig to target depth with straight sides. Add 100–150 mm of clean shingle. Set the post plumb and brace firmly so it will not move while you backfill.
Place stiff mix in lifts, ramming each layer. Keep checking plumb. Form a domed cap to shed water. Let it cure, then slot in panels or fix rails. After the first heavy rain, recheck alignment and re-tighten braces if needed.
This image was generated with AI and may not always represent the product or service exactly.
Increase the diameter and depth for corner, end and gate posts. Add 100–150 mm to depth and step up at least one auger size. This resists racking and seasonal movement.
Use galvanised ironmongery and good hinges. Delay hanging gates until the footing is fully cured. For timber gate posts, consider straps or post supports to reduce twist and guard the ground line.
On slopes, step the line with level gravelboards for a tidy finish. You can rake lighter panels where wind allows, but keep spans short in exposed spots. Small trellis sections at the top can ease wind loads.
Large trees pull moisture from clay and increase movement. Go deeper and reduce bay width in these zones. Always locate buried services before digging and adjust positions to keep safe clearances.
For fields and paddocks, start with oversized strainer posts set deep with gravel sumps. Brace assemblies are essential to hold wire tension without movement.
Chain link works well on concrete posts and rails in clay. Keep wire clear of the ground where possible to avoid corrosion, and maintain tight, even tension through the seasons.
After very dry or very wet spells, walk the fence line. Look for slight gaps or lift. Re-tamp around posts and top up the domed caps where needed to keep water away.
Refresh gravel at the post base if it has silted up. Treat exposed timber annually, especially at and just above the ground line. Keep soil off gravelboards to prevent splash-back and rot.
List every bay, post, gravelboard and panel. Note corners, ends and gates separately. Allow 2–4 bags of post mix per hole in clay, depending on depth and post size. Add 20 mm shingle for each sump.
If building closeboard, add rails, feather edge and fixings to your take-off. Check local availability and delivery lead times. Order a few spare panels or boards to handle breakages or future repairs.
For 1.5–1.8 m fences, target 750–900 mm. For 2.0 m fences, go 900 mm or more. Increase depth near trees and in exposed spots.
Yes, if you control water. Bail out the hole, use a gravel sump, and place stiff, pre-mixed concrete. Protect the cap from rain while it cures.
Concrete slotted posts resist rot and seasonal movement. Treated timber can work if protected at the ground line, but needs more maintenance.
Wait at least 48 hours in cool or damp weather. Longer is safer for heavy gates. Keep braces on until the concrete is fully cured.
Add a 100–150 mm gravel sump and a short gravel-filled weep channel to a free-draining spot. Pre-mix your concrete to a stiff consistency and compact in lifts.
Often a rear garden fence up to 2 m is allowed, but there are exceptions. Check local rules and any road or boundary constraints before you start.
