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Before you mark post centres, identify every buried service that may run along or across the boundary and where each one enters your plot. This reduces strike risk and informs post depth, spacing and materials.
Colchester’s heavy clay swells and shrinks, and coastal winds increase loading. Both affect post sizing and foundations. Walk the full route and mark manholes, covers, valve boxes, utility markers and any changes in level or soil. For design detail, see clay‑heave fencing design for Colchester soils and our guide to choosing fence materials in Essex.
Locate services first, then plan your bays. Never dig blind.
Use insulated hand tools within the caution zone. If anything is unclear, stop and contact the asset owner before proceeding.
Service plans use colours and symbols but legends vary by provider. On‑site spray marks should match the plans; treat all depths as indicative. Services can be shallow after landscaping, repairs or settlement.
Agree a no‑go strip directly over each service, and a wider hand‑dig caution zone to either side. Many teams work to a 300–500 mm horizontal offset as a starting point, but confirm the exact clearance with the asset owner. Record agreed offsets and methods in your build file and keep copies on site.
Shift post centres so joints fall clear of pipes and cables. Keep the line straight by mixing bay widths: use cut‑to‑fit closeboard or alternate standard panel sizes where required. Fix your centres on a sketch before ordering.
Use the correct structural post at every change of direction or layout. End posts, corners, 3‑way posts and inters each carry different loads. For layout tips, see planning a fence run with concrete inters, corners and 3‑way posts. Choose the right type at design stage, not on the day.
This image was generated with AI and may not always represent the product or service exactly.
Keep posts offset from confirmed utility lines. Do not drill, drive or spike into the no‑go zone. Where the route must cross a service, expose it by hand and maintain the owner‑specified cover over the pipe or cable.
Spread loads so nothing bears directly on a service. Use suitable bridging (for example a pre‑cast concrete lintel or dense slab) and confirm the method with the service owner. Never use power augers within the caution zone. Photograph exposed services with a depth reference, note their route, then re‑cover with the correct surround (e.g. sand for pipes) and warning tape before backfilling.
If digging is unsafe or restricted, go above ground. Bolt‑down shoes suit sound concrete pads; verify pad thickness and integrity, then fix with through‑bolts or resin anchors. Where soil is proven clear of services, driven spikes can work for light fences in firm, stone‑free ground.
Reduce disturbance by retaining sound posts and adding concrete repair spurs set clear of services. Raised sleeper courses or planters can form a stable base and move fixings away from utility corridors. Use corrosion‑resistant fixings and seal all cut timber ends.
Wet clay and salty air shorten timber life. Concrete slotted posts and concrete gravelboards offer long service with minimal upkeep. If you choose timber, specify UC4 posts only and keep all timber clear of ground contact.
Where utilities limit digging, open styles such as picket or post‑and‑rail reduce post count and wind load. For a side‑by‑side look at options, read concrete slotted posts vs timber in Essex. Use galvanised or A2/A4 stainless fixings throughout.
Widen holes in soft clay and bell the base where space allows. Avoid waterlogged hole bottoms. Add 50–100 mm of compacted drainage aggregate if the ground holds water. Brace posts plumb and backfill in stages, tamping firmly.
Use quality post mix to the maker’s guidance and crown the top to shed water. Exposed coastal plots need deeper, wider footings and stronger posts. See our guide on fence post depth, clay and post mix in Colchester for practical rules of thumb.
This image was generated with AI and may not always represent the product or service exactly.
Never set posts over inspection covers or visible ducts. Move the gate opening to keep safe clearance and access to services. Keep fixings away from lids and allow space to lift them fully.
Use heavier concrete end or corner posts, or large‑section UC4 timber gate posts, set deeper to take gate loads. Fit quality hook‑and‑band hinges and latches. Add line wire or braces to control sag and keep clearances true over time.
Confirm boundaries and fence heights before you start. Talk to neighbours early to agree the line, height and any working access. Most rear garden fences up to 2 m are permitted; beside a highway the limit is usually 1 m unless you have permission. Check local visibility rules at junctions.
Sketch and photograph confirmed service routes for future work. Do a final locator sweep and a last trial‑hole check before you pour any concrete. For height limits, see 2 m fence height regulations in the UK.
Pre‑dig safety checklist:
Typical order list:
Price your options and see quality in person. Compare local costs with our guide to fencing prices in Essex. Visit Essex Concrete and Fencing to view posts, panels and concrete products before you buy.
Stay off the no‑go strip directly over the service and hand‑dig within a wider caution zone. Many teams use 300–500 mm horizontal offset as a guide, but confirm on site with trial holes and the asset owner’s requirements.
No. Do not use power augers in the caution zone. Hand‑dig with insulated tools after marking and verifying service positions.
Concrete slotted posts with concrete gravelboards give the longest, lowest‑maintenance life. If using timber, choose UC4 posts only and keep timber clear of the ground.
Increase embedment depth and footing width beyond standard guidance and use stronger posts. Add drainage aggregate and ensure firm, staged backfill.
Move the opening to maintain access to covers and ducts. Use robust gate posts set clear of services and leave space to lift the lid fully.
Yes, it’s good practice to agree the boundary line, height and access before works start. Check local height rules and keep a written record of the agreement.
