Choosing post hole diameter for the post size
A hole cut too close to the post's own width leaves no room for concrete to fully surround it, which weakens the base and gives water a direct channel down alongside the timber rather than a solid seal.
A generally quoted rule is a hole roughly three times the post's width, so a 100mm post wants in the region of a 300mm diameter hole, adjusted upward on poor ground or for taller, more heavily loaded posts such as gate posts.
Oversized holes aren't free either — they use more concrete and take longer to backfill and haunch neatly, so the aim is the right diameter for the post and ground rather than simply digging as wide as convenient.
Fences crossing a natural drainage swale in the garden
Some gardens have a shallow natural low line, or swale, that carries surface water across the plot during heavy rain even without any formal drainage installed, and a fence built straight across it without allowance for that flow effectively becomes a small dam.
Water backing up against a fence in these conditions accelerates rot at that specific point and, in significant storms, adds a load the fence wasn't designed to resist.
A gap under the gravel board or a permeable section at the exact point the swale crosses the boundary lets water pass through rather than building up against the structure.
Working over septic or drainage runs
Properties without mains drainage, more common on the rural fringes of Hertfordshire, often have a septic tank or soakaway drainage field with pipework running across the garden that a fence line can unknowingly cross.
A collapsed or compressed drainage pipe under a post base is a common cause of a fence settling unevenly a season or two after installation.
Where a septic system's layout isn't documented, a damp or lush strip of grass running away from the tank is often the visible sign of a soakaway field that needs avoiding when setting posts.
Moss and damp on shaded boundaries
A boundary shaded for most of the day by a building, high hedge or overhanging trees dries far more slowly after rain than an open, sunlit run, and that prolonged dampness is what allows moss and algae to establish on timber.
Beyond the cosmetic green staining, sustained damp accelerates fungal decay in untreated or lightly treated softwood, shortening its service life compared with an identical fence in a sunnier position.
Species and treatment choice matter more on these boundaries — a naturally durable timber or a heavier preservative treatment earns its cost back in reduced maintenance on a permanently shaded run.
Reinstating turf strips damaged by tool storage
A pile of tools, offcuts or a mixing tray left in one spot on a lawn for several days can leave a yellowed, compacted patch even after the job is finished and everything is cleared away.
Moving stored items to a slightly different spot every day or two, where the site allows, spreads that pressure rather than concentrating it in a single dead patch that then needs separate attention to recover.
Where a genuinely fixed storage point is unavoidable, laying a board or matting underneath from the start protects the grass far more effectively than trying to revive a flattened patch afterwards.
Razor mesh panel systems for high-security compounds
A razor mesh panel embeds short, sharp folded barbs directly into the mesh weave itself rather than adding a separate topping coil, giving an anti-cut and anti-climb barrier across the whole panel height rather than only at the top.
These panels carry a higher injury risk than a standard mesh and are typically reserved for high-value compounds such as a fuel depot or a substation, kept well away from any pedestrian route.
Height restrictions on a fence directly fronting a public footpath
A boundary that fronts directly onto a public footpath is often subject to a lower permitted height than a rear or side boundary under general planning rules, since a tall solid structure close to a pavement can affect sightlines and pedestrian safety.
Where security needs push toward a taller specification than the footpath frontage rule allows, planning permission is sought explicitly rather than assumed to fall under permitted development, and a mesh or picket design can sometimes reach greater height than a solid panel under the same visual-impact assessment.
Garden levels raised by decking or patios
A raised deck or built-up patio on one side of a boundary can leave the finished surface level noticeably higher than the fence's original ground-level reference, sometimes reducing the effective fence height as seen from that side.
Where a neighbour raises their ground level after a fence is already installed, drainage that previously ran away from the fence can be redirected toward it, so it's worth checking finished levels on both sides before agreeing a new fence height or base detail.
A fence installed at the same time as a client's own raised patio should account for the new level from the outset, rather than being set to the pre-existing grade and later needing extension.
Wind-tunnelling in gaps between barriers and buildings
A gap between a solid acoustic fence and an adjacent building or wall can accelerate wind through that narrow channel, a wind-tunnelling effect that increases load on both the fence and anything positioned near it.
Closing that gap with a return panel, or accepting a lower barrier height where a gap can't be closed, avoids concentrating wind load onto a single narrow section.
