What we see in N12
The clay subsoil across N12 shrinks in dry summers and swells again over winter, which is the main reason older post-and-panel runs in this district lean or crack at the base years before the timber itself has worn out. A post set in a shallow hole moves with the clay; one set below the depth where the seasonal moisture change reaches stays put. That's a structural question, not a materials one, so the fix for a leaning N12 fence is usually about how the post was originally founded rather than what it's made from.
Towns & neighbourhoods in N12
Barnet Council · N3, N12
Property: Edwardian terraces in Church End, large semis around Hampstead Garden Suburb borders, and 1930s housing in Woodside Park
Garden: mid to large gardens; mature trees and London clay are the recurring constraints
Near A1000 / A406 North Circular / M1 J2 (10 min) / North Circular A406 · Finchley Central, West Finchley, Woodside Park (Northern line)
Commercial anchors: Ballards Lane, Tally Ho Corner
Barnet Council · N12
Property: Edwardian terraces and 1930s semis around Woodside Park
Garden: deep rear gardens, mostly flat with London clay underfoot
Near A1000 / A406 / A406 North Circular · Woodside Park (Northern line)
Commercial anchors: Tally Ho Corner, Ballards Lane
N12 ground survey
We assess soil and post depth before quoting a repair or replacement in North Finchley or Woodside Park.
Services across N12
Frequently asked — N12
Why do N12 fence posts lean after a few dry summers?
Clay shrinkage pulls away from a shallow-set post in dry weather, then swells back unevenly in winter — repeated cycles rock the post loose at the base.
How deep should a post go in N12 clay?
Deep enough to sit below the depth where seasonal moisture change reaches, which varies by soil profile — a site visit confirms it for a specific garden.
Does a concrete post solve the clay problem on its own?
Not on its own — the depth and base preparation matter more than the post material itself.