Concrete Under Fence Plinths — Sydney NSW

Concrete under fence plinths are precast concrete panels installed at the base of Colorbond and timber fencing to prevent direct soil contact, seal gaps, and deliver a clean, professional finish at ground level. Retaining Walls Direct supplies concrete under fence plinths across Greater Sydney — delivered direct to your site in Penrith, Blacktown, Parramatta, Castle Hill, the Northern Beaches, Eastern Suburbs, Inner West, and South West Sydney.

With many years of hands-on retaining wall experience across New South Wales, we understand what Sydney's varied terrain demands. The reactive Wianamatta Shale clay of Western Sydney causes seasonal soil movement that creates gaps under fences over time. The sandstone ridges of the North Shore and Eastern Suburbs create uneven fence lines that need plinths to seal. Getting the base detail right is as important as the fence itself.

Why Sydney Builders Specify Concrete Plinths

Reactive clay protection — Western Sydney's Wianamatta Shale clay (Penrith, Blacktown, Campbelltown, Liverpool) expands and contracts seasonally, creating gaps under fences that concrete plinths seal permanently
Termite resistance — eliminates timber-to-soil contact in Sydney's termite-active western and south-western suburbs
Erosion control — prevents soil undercutting along fence lines during Sydney's heavy summer rainfall events
Pool barrier compliance — eliminates gaps that breach NSW pool barrier regulations under the Swimming Pools Act 1992 (NSW)
Clean finish — creates a professional, integrated look between the retaining wall and fence
Low maintenance — no painting, treating, or replacing rotted fence bases; concrete plinths last the life of the retaining wall

Compatible Fencing Systems

Colorbond steel fencing (all profiles)
Timber paling fencing
Aluminium slat fencing
Pool fencing on retaining walls

NSW Fencing & Planning Requirements

Fence plinths used for minor soil retention along a boundary may require a DA or CDC depending on height and location. Check with your local council before commencing work. See our Retaining Wall Regulations — State-by-State Guide. For walls retaining more than 300mm of soil, a full retaining wall system is recommended — see our Concrete Sleepers Sydney range.

Concrete Under Fence Plinths Sydney NSW