Practical points for boundary work in Finchley Central
Recycled plastic fence posts
Posts made from recycled plastic, sometimes blended with additives for UV resistance and rigidity, avoid timber's rot and insect vulnerability entirely, since the material has no organic content for fungi or insects to attack.
They tend to be more flexible than an equivalent timber section of the same size, which can be an advantage in absorbing impact but a disadvantage where rigidity is needed to resist sustained wind load without visible sway.
Their thermal expansion behaviour is closer to other polymer products than to timber, meaning fixings and adjoining materials need similar allowance for movement as with composite boards rather than being treated as a timber-equivalent product.
Terraced gardens and stepped runs
A garden cut into level terraces, common on steeper plots across the Chilterns fringe, usually means the fence has to step down at each change of level rather than run as one continuous raked line.
Each stepped section needs its own post pair set level within that section, with the horizontal joint between sections finished cleanly rather than leaving an open triangular gap under the lower panel.
Where the terraces are formed by retaining walls rather than simple grading, the fence posts typically sit on top of the wall structure and need fixings suited to masonry rather than a standard earth-set post.
Splash-back staining from adjacent paving
A fence running alongside a patio, path or driveway picks up rain splash-back off the hard surface, which carries fine grit and, on older paving, residual cement dust that leaves a pale tide-mark along the lowest boards.
This band of discolouration is separate from general weathering and won't fade with the rest of the timber, since it is a surface deposit rather than UV bleaching.
A gravel strip or planting border between paving and fence line reduces the splash distance, and a periodic wash-down of just the lower boards keeps the tide-mark from building up permanently.
Conservation area consent for boundary works
Conservation area status doesn't ban fence or wall replacement outright, but it does mean the council can ask for materials and detailing that match the street's traditional character, and demolition of an existing wall over a certain height can itself need consent.
Removing or lowering a historic brick boundary wall is the case most likely to need permission, since unlike a simple fence swap it counts as demolition of a structure that contributes to the area's appearance.
The safest route on any period property is a short pre-application check with the conservation officer, since 'like for like' replacement is treated differently to a change of material or height.
Council neighbour consultation schemes for permitted development
Certain categories of permitted development, mainly larger extensions rather than fencing itself, fall under a formal neighbour consultation scheme requiring the council to notify adjoining owners even without a full planning application.
Boundary fencing itself is rarely covered by this specific scheme, but it's sometimes confused with the ordinary neighbour notification that happens during a full planning application for other works.
Where in doubt about which process applies to a specific project, the council's planning department can clarify which consultation route, if any, is relevant.
Checking a post is plumb in two planes
A post checked with a spirit level on only one face can still be leaning across the run even though it looks vertical along it, so plumb needs confirming on two adjacent faces at right angles before concrete goes in.
This matters most on corner and gate posts, where a lean invisible from the main run direction becomes obvious the moment a gate is hung and doesn't swing true.
Rechecking plumb again just before the concrete starts to go off catches any post nudged out of position while backfilling or bracing, since that's a common point for a post to drift slightly unnoticed.
