Steep sandstone country from Mosman and Willoughby to Frenchs Forest and Avalon
North Shore & northern beaches
The steep, benched blocks north of the harbour are retaining wall country by necessity: most houses stand on platforms carved and filled generations ago, held by tiers of stone, brick and later block walls. Walls here are often tall, old, close to structures, and holding land shared with a neighbour, which raises both the stakes and the approvals questions.
On this network
What Level 2 work looks like here
Tiered wall systems interact: movement in a lower wall can quietly unload onto the tier above or below, so assessment considers the whole terrace, not one wall.
Original dry-stone and sandstone walls have heritage and streetscape value in some suburbs, favouring repair and repointing over replacement.
Runoff concentrating over rock shelves finds its way behind walls that were built with little or no drainage provision.
Boundary walls between stepped blocks raise shared-responsibility questions that are cleaner to resolve before works than during them.
Common jobs
Frequent Level 2 scopes in this area
Assessment and repointing of ageing sandstone terrace walls
Anchoring of tall boundary walls between benched properties
Drainage retrofits behind walls below stormwater-shedding rock
Retaining wall construction and structural repair in NSW generally requires a licensed building or structural landscaping contractor, and walls above council-set height thresholds, commonly in the 600 millimetre to one metre range depending on the council and circumstances, need engineering design and may need development approval. Confirm licence details and the engineer's involvement in writing for any structural wall work.
Wall works
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