Permitted development height limits
Height allowances differ between the front of a plot and the side or rear boundary, and drop further again near a highway where sightlines for road users have to be kept clear. We check the specific limit for the boundary in question rather than quoting a blanket height.
Conservation designation can reduce what's permitted even further, and a boundary next to a corner plot has its own separate sightline rule — both are checked against the site before a height is put on a quote.
Arris rail mortice joints as a water trap
The mortice joint where an arris rail meets a post is a natural place for water to collect, since the joint interrupts the smooth run of both timbers and can hold moisture in the gap even after the surrounding wood has dried.
This is a common early failure point on older featherboard fencing, where the rail can rot through at the joint while the rest of the rail well away from the post remains sound.
Modern galvanised joist-hanger-style brackets used instead of a traditional mortice avoid this trap entirely, which is why many newer close-boarded fences use bracket fixings even where the visual style still resembles a traditional arris rail panel.
Post anchor sockets versus set-in posts
A bolt-down or drive-in post anchor holds a timber post entirely above ground level, isolating the post's end grain from the direct soil and moisture contact it would face if simply set into a concreted hole.
Because the post itself never touches the ground, anchor-mounted posts largely avoid the ground-line rot that's the single most common failure point for concreted posts, though the anchor and its fixings become the new focus for corrosion.
Anchors do transfer more concentrated leverage into a smaller fixing area at the base than a post set deep in concrete, so they generally need a correspondingly larger or deeper concrete footing beneath them for the same wind load.
Off-street parking and dropped kerbs
Converting a front garden to off-street parking usually requires a dropped kerb permit from the highway authority, and a boundary fence or gate across that new access has to be positioned clear of the visibility splay the dropped kerb creates.
Where a low front boundary already exists specifically to preserve sightlines onto the new parking, replacing it with a taller or solid fence can undo the safety benefit the dropped kerb approval was granted on.
It's worth checking whether the dropped kerb approval included any conditions on boundary treatment before ordering a new front fence or gate.
Building decking over an existing patio or hardstanding
Decking built directly over a sound existing patio saves the cost and disruption of breaking out the old surface, provided the substructure can be securely fixed to it and a fall is built in for drainage rather than trapping water underneath.
A patio with a slope toward the house, rather than away from it, needs correcting in the decking substructure rather than simply built over as-is, since a deck can't fix a drainage problem it's built directly on top of.
Ventilation gaps around the edge of a deck built over solid paving matter just as much as one built over soil, since trapped moisture and poor airflow cause the same rot risk to the substructure timber either way.
Ivy growth as a structural load
Established ivy doesn't just sit on a fence for appearance — its woody stems and aerial roots add real dead weight, and a mature growth can add the equivalent of several boards' worth of load to a panel over years of unchecked growth.
Ivy also holds moisture directly against the timber or brickwork it covers, which accelerates rot or mortar erosion underneath even though the visible growth looks healthy.
Removing mature ivy from a fence intended to stay in place needs care, since cutting the base and letting it die back gradually avoids suddenly exposing timber that has been softened by long-term dampness underneath.
British Standards relevant to fencing
BS 1722 covers specifications for fences and gates across a range of types including chain link, wooden palisade, and estate fencing, setting out minimum post spacing, wire gauges and timber dimensions for each category.
These standards aren't legally mandatory on a private domestic job in the way building regulations are, but they're the reference point used in commercial specifications, school and public sector tenders, and by insurers assessing whether a boundary structure was reasonably built.
Where a job is speculatively described as 'to British Standard', it's worth confirming which specific part of BS 1722 is meant, since the standard covers a wide family of very different fence types.
Repairing a fence smothered by a neighbour's overgrown vegetation
Ivy, brambles or an overgrown hedge growing through and over a fence from next door often has to be cut back before the extent of the damage underneath can even be assessed properly, and that cutting back needs the neighbour's agreement if the growth originates on their side.
Vegetation left growing through a repaired section will usually cause the same damage again, so flagging this to the client as an ongoing issue rather than just repairing around it is worth doing.
A physical boundary survey versus the title plan
A chartered surveyor's physical boundary survey measures the actual position of fences, walls and other features on the ground, which can differ noticeably from the general boundary shown on a Land Registry plan.
These two sources sometimes tell different stories on older plots, particularly where fences have shifted, been rebuilt slightly off-line, or the original conveyance plan was drawn at a small scale.
For a routine fence replacement this rarely matters, but where a genuine discrepancy is suspected, a professional survey carries more evidential weight than either party's assumption.
Reinforcing a hinge post weakened by gate movement
A gate hinge post takes repeated leverage every time the gate swings, which loosens its footing faster than a plain fence post nearby carrying no such load, and it's a common early failure point on a boundary that includes a gate.
Reinforcing usually means a larger post section, a deeper footing, or bracing back into the adjoining fence run, rather than simply resetting the same post size that already proved inadequate for the load.
Digging in summer-baked clay ground
Clay that's dried and cracked over a hot summer can be almost as hard as digging through soft rock in the top few hundred millimetres, even though the same ground would be workable a season later once it's rehydrated.
An auger struggles on baked clay in the same way it struggles on rubble, tending to bounce and judder rather than cut cleanly, so a pilot hole broken up with a bar first can make the auger's job easier.
Watering the dig point lightly the day before, where practical, softens the very top layer enough to ease the first stage of digging without turning the hole into a mud pit.
Salt and de-icing near a pavement
A front boundary fence close to a pavement or road gritted in winter is exposed to salt spray and run-off that a rear-garden fence never sees, and that salt accelerates corrosion in untreated steel fixings and speeds up timber degradation at ground level.
Galvanised or stainless fixings resist this better than standard bright steel, and are worth specifying as standard on any boundary within a few metres of a regularly gritted surface.
Salt-laden ground also tends to stay damp for longer after a thaw, extending the period a post base is sitting in wet conditions each winter.
Diagnosing sag, frame rack or post lean
A gate that no longer closes properly can be dropping at the hinge corner, racking as a whole rectangle out of square, or simply following a hinge post that's leaning in the ground — each has a different fix and they're easy to mix up from the ground.
We check the post for plumb first, then check the frame diagonals against each other, and only then look at the hinges themselves, since treating a leaning post as a hinge fault wastes a repair visit.
Supporting neighbouring posts while replacing a single panel
Removing one panel from an established run can momentarily remove lateral support the panel itself was providing to its neighbouring posts, particularly on an older run where posts have relied on the panels bracing each other.
Temporary bracing on the posts either side while the old panel is out and the new one is fitted avoids one of them leaning or shifting during the brief window it's unsupported.
This is more of a concern on taller or more exposed runs than on a short, sheltered garden fence, but it's a quick precaution worth taking on any repair rather than assuming the remaining structure will hold itself steady unaided.
Softwood species used in fencing
Most UK fencing timber is a European redwood or whitewood softwood, chosen for cost and workability rather than natural durability, which is why it's almost always sold pressure-treated rather than untreated.
Redwood (Scots pine) takes preservative more readily than whitewood (spruce) because of its structure, which is part of why it's the more common species specified for treated fencing components.
Species alone isn't a durability guarantee — the treatment class and detailing (post caps, gravel boards, drainage at the base) generally matter more to service life than which softwood was used underneath it.
Noise from works and considerate constructor practice
Percussive work like post-driving, cutting concrete gravel boards or using a breaker on old foundations generates noise that can exceed what's reasonable outside the agreed working hours, even where the overall job is short.
A simple courtesy notice to immediate neighbours ahead of noisy days, giving a rough time window, reduces the chance of a complaint escalating to environmental health, which has statutory powers to serve an abatement notice on persistent nuisance noise.
Sequencing the noisiest tasks earlier in the working day and away from very early morning or evening, even within the permitted hours, is standard considerate practice on jobs close to occupied houses.
Weed and damp membrane beneath a ground-level deck
A permeable membrane laid over the ground beneath a low-level deck suppresses weed growth and reduces the amount of moisture rising from bare soil into the enclosed void under the boards.
It needs to be permeable rather than a solid impermeable sheet, since trapping ground moisture entirely beneath an impermeable membrane can create a worse damp environment than leaving the soil exposed to some airflow.
Combined with adequate ventilation gaps at the deck's edges, a permeable membrane is a low-cost addition that measurably reduces the humidity the joists sit in throughout the year.
Frost effects on curing concrete
Concrete that freezes before it has gained enough initial strength can suffer permanent damage — the water within it expands as ice, disrupting the matrix before it sets properly, leaving a weaker base than the mix should give.
Fast-setting post-fix concretes generate some heat as they cure and are more frost-tolerant than a standard wet mix, which is one reason they're the practical choice for winter installations.
Where a hard frost is forecast within the first 24 hours of a pour, delaying the job or insulating the base overnight is usually cheaper than replacing a post that's failed at the concrete collar the following year.
Gravel board material choices
A gravel board sits at the base of a panel fence to keep the panel itself clear of ground moisture and splashback, and is commonly available in treated timber, concrete or composite, each with different durability trade-offs at that most exposed position.
Timber gravel boards are the cheapest to replace individually but also the first component to rot, since they sit closest to damp ground and soil splash, while concrete gravel boards resist rot entirely but can crack under impact or ground movement.
Composite gravel boards split the difference, resisting moisture better than timber without concrete's brittleness, though they typically cost more than either alternative for the same length.
Reinstating the ground surface after post installation
Concreting a post line through a lawn, gravel or paved surface leaves disturbed ground either side that needs reinstating to stop it becoming a trip hazard or a soft spot that later settles unevenly.
On a paved or block-paved surface, cut edges are made clean and matching material is used for reinstatement rather than left as a visible, poorly finished scar along the new fence line.
Algae growth on north-facing panels
A boundary that faces north, or sits in the permanent shade of a tall building or dense hedge, stays damp for far longer after rain than a south-facing run, which is exactly the condition green algae needs to establish.
Algae on timber is mostly cosmetic in the early stages but makes the surface noticeably slippery, which matters where a fence line doubles as an informal foothold near steps or a sloped path.
A dilute biocidal wash applied before restaining is more effective long-term than staining directly over algae, which simply seals damp organic growth beneath the new coating.
Obstruction offences under the Highways Act
The Highways Act 1980 makes it an offence to obstruct a public highway, including the footway, without lawful authority, which is the underlying reason fencing, skips or materials on a pavement need proper authorisation.
This applies regardless of whether the obstruction is temporary for a delivery or intended as a permanent boundary feature encroaching onto highway land.
Where any part of planned boundary work might extend onto or over a public footway or verge, checking with the highway authority first avoids a straightforward enforcement issue later.
